From 9e47b67af20b0254eb420e06881d1df90c218f1d Mon Sep 17 00:00:00 2001
From: JochiSt <jochen.steinmann@web.de>
Date: Tue, 17 Jan 2023 13:42:14 +0100
Subject: [PATCH 1/8] updated the CubeMxs file to v6.5.0 and include I2C slave

---
 firmware/Inc/adc.h                | 14 +++++-----
 firmware/Inc/can.h                | 14 +++++-----
 firmware/Inc/dma.h                | 14 +++++-----
 firmware/Inc/gpio.h               | 14 +++++-----
 firmware/Inc/i2c.h                | 15 ++++++-----
 firmware/Inc/main.h               |  2 --
 firmware/Inc/spi.h                | 14 +++++-----
 firmware/Inc/stm32f1xx_hal_conf.h | 14 +++++-----
 firmware/Inc/stm32f1xx_it.h       |  3 +--
 firmware/Inc/tim.h                | 15 ++++++-----
 firmware/Inc/usart.h              | 14 +++++-----
 firmware/OpenFlowMeter.ioc        | 15 +++++++++--
 firmware/Src/adc.c                | 34 +++++++++++++++++-------
 firmware/Src/can.c                | 26 +++++++++++-------
 firmware/Src/dma.c                | 14 +++++-----
 firmware/Src/gpio.c               | 15 +++++------
 firmware/Src/i2c.c                | 44 ++++++++++++++++++++++++-------
 firmware/Src/main.c               |  3 +--
 firmware/Src/spi.c                | 26 +++++++++++-------
 firmware/Src/stm32f1xx_hal_msp.c  |  2 --
 firmware/Src/stm32f1xx_it.c       | 16 ++++++++++-
 firmware/Src/tim.c                | 38 +++++++++++++++++++-------
 firmware/Src/usart.c              | 26 +++++++++++-------
 23 files changed, 248 insertions(+), 144 deletions(-)

diff --git a/firmware/Inc/adc.h b/firmware/Inc/adc.h
index e0e1631..3c59f24 100644
--- a/firmware/Inc/adc.h
+++ b/firmware/Inc/adc.h
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    adc.h
@@ -6,16 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
+/* USER CODE END Header */
 /* Define to prevent recursive inclusion -------------------------------------*/
 #ifndef __ADC_H__
 #define __ADC_H__
@@ -57,4 +58,3 @@ void MX_ADC1_Init(void);
 
 #endif /* __ADC_H__ */
 
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Inc/can.h b/firmware/Inc/can.h
index 6d9d6cf..f7c78db 100644
--- a/firmware/Inc/can.h
+++ b/firmware/Inc/can.h
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    can.h
@@ -6,16 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
+/* USER CODE END Header */
 /* Define to prevent recursive inclusion -------------------------------------*/
 #ifndef __CAN_H__
 #define __CAN_H__
@@ -82,4 +83,3 @@ void CAN_send_Configuration();
 
 #endif /* __CAN_H__ */
 
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Inc/dma.h b/firmware/Inc/dma.h
index a8745ce..9b1e623 100644
--- a/firmware/Inc/dma.h
+++ b/firmware/Inc/dma.h
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    dma.h
@@ -6,16 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
+/* USER CODE END Header */
 /* Define to prevent recursive inclusion -------------------------------------*/
 #ifndef __DMA_H__
 #define __DMA_H__
@@ -49,4 +50,3 @@ void MX_DMA_Init(void);
 
 #endif /* __DMA_H__ */
 
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Inc/gpio.h b/firmware/Inc/gpio.h
index 4385090..6c03ac7 100644
--- a/firmware/Inc/gpio.h
+++ b/firmware/Inc/gpio.h
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    gpio.h
@@ -6,16 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
+/* USER CODE END Header */
 /* Define to prevent recursive inclusion -------------------------------------*/
 #ifndef __GPIO_H__
 #define __GPIO_H__
@@ -46,4 +47,3 @@ void MX_GPIO_Init(void);
 #endif
 #endif /*__ GPIO_H__ */
 
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Inc/i2c.h b/firmware/Inc/i2c.h
index 3c939b5..39c6211 100644
--- a/firmware/Inc/i2c.h
+++ b/firmware/Inc/i2c.h
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    i2c.h
@@ -6,16 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
+/* USER CODE END Header */
 /* Define to prevent recursive inclusion -------------------------------------*/
 #ifndef __I2C_H__
 #define __I2C_H__
@@ -32,6 +33,7 @@ extern "C" {
 /* USER CODE END Includes */
 
 extern I2C_HandleTypeDef hi2c1;
+
 extern I2C_HandleTypeDef hi2c2;
 
 /* USER CODE BEGIN Private defines */
@@ -51,4 +53,3 @@ void MX_I2C2_Init(void);
 
 #endif /* __I2C_H__ */
 
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Inc/main.h b/firmware/Inc/main.h
index 59b8db2..6c66b75 100644
--- a/firmware/Inc/main.h
+++ b/firmware/Inc/main.h
@@ -80,5 +80,3 @@ void Error_Handler(void);
 #endif
 
 #endif /* __MAIN_H */
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Inc/spi.h b/firmware/Inc/spi.h
index 87eff37..522da13 100644
--- a/firmware/Inc/spi.h
+++ b/firmware/Inc/spi.h
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    spi.h
@@ -6,16 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
+/* USER CODE END Header */
 /* Define to prevent recursive inclusion -------------------------------------*/
 #ifndef __SPI_H__
 #define __SPI_H__
@@ -49,4 +50,3 @@ void MX_SPI2_Init(void);
 
 #endif /* __SPI_H__ */
 
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Inc/stm32f1xx_hal_conf.h b/firmware/Inc/stm32f1xx_hal_conf.h
index 846435d..c41f8e4 100644
--- a/firmware/Inc/stm32f1xx_hal_conf.h
+++ b/firmware/Inc/stm32f1xx_hal_conf.h
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    stm32f1xx_hal_conf.h
@@ -5,16 +6,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
+/* USER CODE END Header */
 
 /* Define to prevent recursive inclusion -------------------------------------*/
 #ifndef __STM32F1xx_HAL_CONF_H
@@ -388,4 +389,3 @@ void assert_failed(uint8_t* file, uint32_t line);
 
 #endif /* __STM32F1xx_HAL_CONF_H */
 
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Inc/stm32f1xx_it.h b/firmware/Inc/stm32f1xx_it.h
index e3e6ce0..b1980e4 100644
--- a/firmware/Inc/stm32f1xx_it.h
+++ b/firmware/Inc/stm32f1xx_it.h
@@ -60,6 +60,7 @@ void DMA1_Channel1_IRQHandler(void);
 void USB_LP_CAN1_RX0_IRQHandler(void);
 void CAN1_RX1_IRQHandler(void);
 void TIM2_IRQHandler(void);
+void I2C2_EV_IRQHandler(void);
 /* USER CODE BEGIN EFP */
 
 /* USER CODE END EFP */
@@ -69,5 +70,3 @@ void TIM2_IRQHandler(void);
 #endif
 
 #endif /* __STM32F1xx_IT_H */
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Inc/tim.h b/firmware/Inc/tim.h
index 337e4fe..7635872 100644
--- a/firmware/Inc/tim.h
+++ b/firmware/Inc/tim.h
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    tim.h
@@ -6,16 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
+/* USER CODE END Header */
 /* Define to prevent recursive inclusion -------------------------------------*/
 #ifndef __TIM_H__
 #define __TIM_H__
@@ -32,6 +33,7 @@ extern "C" {
 /* USER CODE END Includes */
 
 extern TIM_HandleTypeDef htim2;
+
 extern TIM_HandleTypeDef htim3;
 
 /* USER CODE BEGIN Private defines */
@@ -53,4 +55,3 @@ void HAL_TIM_MspPostInit(TIM_HandleTypeDef *htim);
 
 #endif /* __TIM_H__ */
 
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Inc/usart.h b/firmware/Inc/usart.h
index 7df91ef..b86eff0 100644
--- a/firmware/Inc/usart.h
+++ b/firmware/Inc/usart.h
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    usart.h
@@ -6,16 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
+/* USER CODE END Header */
 /* Define to prevent recursive inclusion -------------------------------------*/
 #ifndef __USART_H__
 #define __USART_H__
@@ -49,4 +50,3 @@ void MX_USART1_UART_Init(void);
 
 #endif /* __USART_H__ */
 
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/OpenFlowMeter.ioc b/firmware/OpenFlowMeter.ioc
index 566eeda..90e7b13 100644
--- a/firmware/OpenFlowMeter.ioc
+++ b/firmware/OpenFlowMeter.ioc
@@ -48,6 +48,8 @@ Dma.Request0=ADC1
 Dma.RequestsNb=1
 File.Version=6
 GPIO.groupedBy=Group By Peripherals
+I2C2.IPParameters=OwnAddress
+I2C2.OwnAddress=0x20
 KeepUserPlacement=true
 Mcu.CPN=STM32F103C8T6
 Mcu.Family=STM32F1
@@ -107,14 +109,15 @@ Mcu.PinsNb=37
 Mcu.ThirdPartyNb=0
 Mcu.UserConstants=
 Mcu.UserName=STM32F103C8Tx
-MxCube.Version=6.1.2
-MxDb.Version=DB.6.0.10
+MxCube.Version=6.5.0
+MxDb.Version=DB.6.0.50
 NVIC.BusFault_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:true
 NVIC.CAN1_RX1_IRQn=true\:0\:0\:false\:false\:true\:true\:true\:true
 NVIC.DMA1_Channel1_IRQn=true\:0\:0\:false\:false\:true\:false\:true\:true
 NVIC.DebugMonitor_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:true
 NVIC.ForceEnableDMAVector=true
 NVIC.HardFault_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:true
+NVIC.I2C2_EV_IRQn=true\:0\:0\:false\:false\:true\:true\:true\:true
 NVIC.MemoryManagement_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:true
 NVIC.NonMaskableInt_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:true
 NVIC.PendSV_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:true
@@ -173,9 +176,13 @@ PB1.GPIO_Label=LED4
 PB1.GPIO_ModeDefaultOutputPP=GPIO_MODE_OUTPUT_OD
 PB1.Locked=true
 PB1.Signal=GPIO_Output
+PB10.GPIOParameters=GPIO_Pu
+PB10.GPIO_Pu=GPIO_PULLUP
 PB10.Locked=true
 PB10.Mode=I2C
 PB10.Signal=I2C2_SCL
+PB11.GPIOParameters=GPIO_Pu
+PB11.GPIO_Pu=GPIO_PULLUP
 PB11.Locked=true
 PB11.Mode=I2C
 PB11.Signal=I2C2_SDA
@@ -204,9 +211,13 @@ PB5.GPIO_Label=LED1
 PB5.GPIO_ModeDefaultOutputPP=GPIO_MODE_OUTPUT_OD
 PB5.Locked=true
 PB5.Signal=GPIO_Output
+PB6.GPIOParameters=GPIO_Pu
+PB6.GPIO_Pu=GPIO_PULLUP
 PB6.Locked=true
 PB6.Mode=I2C
 PB6.Signal=I2C1_SCL
+PB7.GPIOParameters=GPIO_Pu
+PB7.GPIO_Pu=GPIO_PULLUP
 PB7.Locked=true
 PB7.Mode=I2C
 PB7.Signal=I2C1_SDA
diff --git a/firmware/Src/adc.c b/firmware/Src/adc.c
index d4f96a0..8102c2c 100644
--- a/firmware/Src/adc.c
+++ b/firmware/Src/adc.c
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    adc.c
@@ -6,17 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
-
+/* USER CODE END Header */
 /* Includes ------------------------------------------------------------------*/
 #include "adc.h"
 
@@ -43,8 +43,17 @@ DMA_HandleTypeDef hdma_adc1;
 /* ADC1 init function */
 void MX_ADC1_Init(void)
 {
+
+  /* USER CODE BEGIN ADC1_Init 0 */
+
+  /* USER CODE END ADC1_Init 0 */
+
   ADC_ChannelConfTypeDef sConfig = {0};
 
+  /* USER CODE BEGIN ADC1_Init 1 */
+
+  /* USER CODE END ADC1_Init 1 */
+
   /** Common config
   */
   hadc1.Instance = ADC1;
@@ -58,6 +67,7 @@ void MX_ADC1_Init(void)
   {
     Error_Handler();
   }
+
   /** Configure Regular Channel
   */
   sConfig.Channel = ADC_CHANNEL_0;
@@ -67,6 +77,7 @@ void MX_ADC1_Init(void)
   {
     Error_Handler();
   }
+
   /** Configure Regular Channel
   */
   sConfig.Channel = ADC_CHANNEL_1;
@@ -75,6 +86,7 @@ void MX_ADC1_Init(void)
   {
     Error_Handler();
   }
+
   /** Configure Regular Channel
   */
   sConfig.Channel = ADC_CHANNEL_2;
@@ -83,6 +95,7 @@ void MX_ADC1_Init(void)
   {
     Error_Handler();
   }
+
   /** Configure Regular Channel
   */
   sConfig.Channel = ADC_CHANNEL_3;
@@ -91,6 +104,7 @@ void MX_ADC1_Init(void)
   {
     Error_Handler();
   }
+
   /** Configure Regular Channel
   */
   sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
@@ -99,6 +113,7 @@ void MX_ADC1_Init(void)
   {
     Error_Handler();
   }
+
   /** Configure Regular Channel
   */
   sConfig.Channel = ADC_CHANNEL_VREFINT;
@@ -107,6 +122,9 @@ void MX_ADC1_Init(void)
   {
     Error_Handler();
   }
+  /* USER CODE BEGIN ADC1_Init 2 */
+
+  /* USER CODE END ADC1_Init 2 */
 
 }
 
@@ -221,5 +239,3 @@ void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc){
 }
 
 /* USER CODE END 1 */
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Src/can.c b/firmware/Src/can.c
index 0f66697..5579ceb 100644
--- a/firmware/Src/can.c
+++ b/firmware/Src/can.c
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    can.c
@@ -6,17 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
-
+/* USER CODE END Header */
 /* Includes ------------------------------------------------------------------*/
 #include "can.h"
 
@@ -45,6 +45,13 @@ CAN_HandleTypeDef hcan;
 void MX_CAN_Init(void)
 {
 
+  /* USER CODE BEGIN CAN_Init 0 */
+
+  /* USER CODE END CAN_Init 0 */
+
+  /* USER CODE BEGIN CAN_Init 1 */
+
+  /* USER CODE END CAN_Init 1 */
   hcan.Instance = CAN1;
   hcan.Init.Prescaler = 6;
   hcan.Init.Mode = CAN_MODE_NORMAL;
@@ -61,6 +68,9 @@ void MX_CAN_Init(void)
   {
     Error_Handler();
   }
+  /* USER CODE BEGIN CAN_Init 2 */
+
+  /* USER CODE END CAN_Init 2 */
 
 }
 
@@ -408,5 +418,3 @@ void CAN_send_Configuration(void){
 }
 
 /* USER CODE END 1 */
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Src/dma.c b/firmware/Src/dma.c
index c602053..0d66a33 100644
--- a/firmware/Src/dma.c
+++ b/firmware/Src/dma.c
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    dma.c
@@ -6,16 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
+/* USER CODE END Header */
 
 /* Includes ------------------------------------------------------------------*/
 #include "dma.h"
@@ -52,4 +53,3 @@ void MX_DMA_Init(void)
 
 /* USER CODE END 2 */
 
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Src/gpio.c b/firmware/Src/gpio.c
index 19dd98f..b039065 100644
--- a/firmware/Src/gpio.c
+++ b/firmware/Src/gpio.c
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    gpio.c
@@ -6,16 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
+/* USER CODE END Header */
 
 /* Includes ------------------------------------------------------------------*/
 #include "gpio.h"
@@ -82,5 +83,3 @@ void MX_GPIO_Init(void)
 /* USER CODE BEGIN 2 */
 
 /* USER CODE END 2 */
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Src/i2c.c b/firmware/Src/i2c.c
index ce00751..0dc2d07 100644
--- a/firmware/Src/i2c.c
+++ b/firmware/Src/i2c.c
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    i2c.c
@@ -6,17 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
-
+/* USER CODE END Header */
 /* Includes ------------------------------------------------------------------*/
 #include "i2c.h"
 
@@ -31,6 +31,13 @@ I2C_HandleTypeDef hi2c2;
 void MX_I2C1_Init(void)
 {
 
+  /* USER CODE BEGIN I2C1_Init 0 */
+
+  /* USER CODE END I2C1_Init 0 */
+
+  /* USER CODE BEGIN I2C1_Init 1 */
+
+  /* USER CODE END I2C1_Init 1 */
   hi2c1.Instance = I2C1;
   hi2c1.Init.ClockSpeed = 100000;
   hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
@@ -44,16 +51,26 @@ void MX_I2C1_Init(void)
   {
     Error_Handler();
   }
+  /* USER CODE BEGIN I2C1_Init 2 */
+
+  /* USER CODE END I2C1_Init 2 */
 
 }
 /* I2C2 init function */
 void MX_I2C2_Init(void)
 {
 
+  /* USER CODE BEGIN I2C2_Init 0 */
+
+  /* USER CODE END I2C2_Init 0 */
+
+  /* USER CODE BEGIN I2C2_Init 1 */
+
+  /* USER CODE END I2C2_Init 1 */
   hi2c2.Instance = I2C2;
   hi2c2.Init.ClockSpeed = 100000;
   hi2c2.Init.DutyCycle = I2C_DUTYCYCLE_2;
-  hi2c2.Init.OwnAddress1 = 0;
+  hi2c2.Init.OwnAddress1 = 64;
   hi2c2.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
   hi2c2.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
   hi2c2.Init.OwnAddress2 = 0;
@@ -63,6 +80,9 @@ void MX_I2C2_Init(void)
   {
     Error_Handler();
   }
+  /* USER CODE BEGIN I2C2_Init 2 */
+
+  /* USER CODE END I2C2_Init 2 */
 
 }
 
@@ -110,6 +130,10 @@ void HAL_I2C_MspInit(I2C_HandleTypeDef* i2cHandle)
 
     /* I2C2 clock enable */
     __HAL_RCC_I2C2_CLK_ENABLE();
+
+    /* I2C2 interrupt Init */
+    HAL_NVIC_SetPriority(I2C2_EV_IRQn, 0, 0);
+    HAL_NVIC_EnableIRQ(I2C2_EV_IRQn);
   /* USER CODE BEGIN I2C2_MspInit 1 */
 
   /* USER CODE END I2C2_MspInit 1 */
@@ -155,6 +179,8 @@ void HAL_I2C_MspDeInit(I2C_HandleTypeDef* i2cHandle)
 
     HAL_GPIO_DeInit(GPIOB, GPIO_PIN_11);
 
+    /* I2C2 interrupt Deinit */
+    HAL_NVIC_DisableIRQ(I2C2_EV_IRQn);
   /* USER CODE BEGIN I2C2_MspDeInit 1 */
 
   /* USER CODE END I2C2_MspDeInit 1 */
@@ -164,5 +190,3 @@ void HAL_I2C_MspDeInit(I2C_HandleTypeDef* i2cHandle)
 /* USER CODE BEGIN 1 */
 
 /* USER CODE END 1 */
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Src/main.c b/firmware/Src/main.c
index 5d05424..a127f78 100644
--- a/firmware/Src/main.c
+++ b/firmware/Src/main.c
@@ -526,6 +526,7 @@ void SystemClock_Config(void)
   {
     Error_Handler();
   }
+
   /** Initializes the CPU, AHB and APB buses clocks
   */
   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
@@ -585,5 +586,3 @@ void assert_failed(uint8_t *file, uint32_t line)
   /* USER CODE END 6 */
 }
 #endif /* USE_FULL_ASSERT */
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Src/spi.c b/firmware/Src/spi.c
index b152f03..57b26f5 100644
--- a/firmware/Src/spi.c
+++ b/firmware/Src/spi.c
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    spi.c
@@ -6,17 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
-
+/* USER CODE END Header */
 /* Includes ------------------------------------------------------------------*/
 #include "spi.h"
 
@@ -30,6 +30,13 @@ SPI_HandleTypeDef hspi2;
 void MX_SPI2_Init(void)
 {
 
+  /* USER CODE BEGIN SPI2_Init 0 */
+
+  /* USER CODE END SPI2_Init 0 */
+
+  /* USER CODE BEGIN SPI2_Init 1 */
+
+  /* USER CODE END SPI2_Init 1 */
   hspi2.Instance = SPI2;
   hspi2.Init.Mode = SPI_MODE_MASTER;
   hspi2.Init.Direction = SPI_DIRECTION_2LINES;
@@ -46,6 +53,9 @@ void MX_SPI2_Init(void)
   {
     Error_Handler();
   }
+  /* USER CODE BEGIN SPI2_Init 2 */
+
+  /* USER CODE END SPI2_Init 2 */
 
 }
 
@@ -112,5 +122,3 @@ void HAL_SPI_MspDeInit(SPI_HandleTypeDef* spiHandle)
 /* USER CODE BEGIN 1 */
 
 /* USER CODE END 1 */
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Src/stm32f1xx_hal_msp.c b/firmware/Src/stm32f1xx_hal_msp.c
index 3bbd864..cd61941 100644
--- a/firmware/Src/stm32f1xx_hal_msp.c
+++ b/firmware/Src/stm32f1xx_hal_msp.c
@@ -84,5 +84,3 @@ void HAL_MspInit(void)
 /* USER CODE BEGIN 1 */
 
 /* USER CODE END 1 */
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Src/stm32f1xx_it.c b/firmware/Src/stm32f1xx_it.c
index 6d10c43..0a43d65 100644
--- a/firmware/Src/stm32f1xx_it.c
+++ b/firmware/Src/stm32f1xx_it.c
@@ -58,6 +58,7 @@
 /* External variables --------------------------------------------------------*/
 extern DMA_HandleTypeDef hdma_adc1;
 extern CAN_HandleTypeDef hcan;
+extern I2C_HandleTypeDef hi2c2;
 extern TIM_HandleTypeDef htim2;
 /* USER CODE BEGIN EV */
 
@@ -257,7 +258,20 @@ void TIM2_IRQHandler(void)
   /* USER CODE END TIM2_IRQn 1 */
 }
 
+/**
+  * @brief This function handles I2C2 event interrupt.
+  */
+void I2C2_EV_IRQHandler(void)
+{
+  /* USER CODE BEGIN I2C2_EV_IRQn 0 */
+
+  /* USER CODE END I2C2_EV_IRQn 0 */
+  HAL_I2C_EV_IRQHandler(&hi2c2);
+  /* USER CODE BEGIN I2C2_EV_IRQn 1 */
+
+  /* USER CODE END I2C2_EV_IRQn 1 */
+}
+
 /* USER CODE BEGIN 1 */
 
 /* USER CODE END 1 */
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Src/tim.c b/firmware/Src/tim.c
index 2d941ce..746bbc0 100644
--- a/firmware/Src/tim.c
+++ b/firmware/Src/tim.c
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    tim.c
@@ -6,17 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
-
+/* USER CODE END Header */
 /* Includes ------------------------------------------------------------------*/
 #include "tim.h"
 
@@ -33,9 +33,17 @@ TIM_HandleTypeDef htim3;
 /* TIM2 init function */
 void MX_TIM2_Init(void)
 {
+
+  /* USER CODE BEGIN TIM2_Init 0 */
+
+  /* USER CODE END TIM2_Init 0 */
+
   TIM_ClockConfigTypeDef sClockSourceConfig = {0};
   TIM_MasterConfigTypeDef sMasterConfig = {0};
 
+  /* USER CODE BEGIN TIM2_Init 1 */
+
+  /* USER CODE END TIM2_Init 1 */
   htim2.Instance = TIM2;
   htim2.Init.Prescaler = 5400-1;
   htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
@@ -57,15 +65,26 @@ void MX_TIM2_Init(void)
   {
     Error_Handler();
   }
+  /* USER CODE BEGIN TIM2_Init 2 */
+
+  /* USER CODE END TIM2_Init 2 */
 
 }
 /* TIM3 init function */
 void MX_TIM3_Init(void)
 {
+
+  /* USER CODE BEGIN TIM3_Init 0 */
+
+  /* USER CODE END TIM3_Init 0 */
+
   TIM_ClockConfigTypeDef sClockSourceConfig = {0};
   TIM_MasterConfigTypeDef sMasterConfig = {0};
   TIM_OC_InitTypeDef sConfigOC = {0};
 
+  /* USER CODE BEGIN TIM3_Init 1 */
+
+  /* USER CODE END TIM3_Init 1 */
   htim3.Instance = TIM3;
   htim3.Init.Prescaler = 0;
   htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
@@ -103,6 +122,9 @@ void MX_TIM3_Init(void)
   {
     Error_Handler();
   }
+  /* USER CODE BEGIN TIM3_Init 2 */
+
+  /* USER CODE END TIM3_Init 2 */
   HAL_TIM_MspPostInit(&htim3);
 
 }
@@ -210,5 +232,3 @@ void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef* htim){
 */
 }
 /* USER CODE END 1 */
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/firmware/Src/usart.c b/firmware/Src/usart.c
index 05981bb..e51fda6 100644
--- a/firmware/Src/usart.c
+++ b/firmware/Src/usart.c
@@ -1,3 +1,4 @@
+/* USER CODE BEGIN Header */
 /**
   ******************************************************************************
   * @file    usart.c
@@ -6,17 +7,16 @@
   ******************************************************************************
   * @attention
   *
-  * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
-  * All rights reserved.</center></h2>
+  * Copyright (c) 2023 STMicroelectronics.
+  * All rights reserved.
   *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
   */
-
+/* USER CODE END Header */
 /* Includes ------------------------------------------------------------------*/
 #include "usart.h"
 
@@ -31,6 +31,13 @@ UART_HandleTypeDef huart1;
 void MX_USART1_UART_Init(void)
 {
 
+  /* USER CODE BEGIN USART1_Init 0 */
+
+  /* USER CODE END USART1_Init 0 */
+
+  /* USER CODE BEGIN USART1_Init 1 */
+
+  /* USER CODE END USART1_Init 1 */
   huart1.Instance = USART1;
   huart1.Init.BaudRate = 115200;
   huart1.Init.WordLength = UART_WORDLENGTH_8B;
@@ -43,6 +50,9 @@ void MX_USART1_UART_Init(void)
   {
     Error_Handler();
   }
+  /* USER CODE BEGIN USART1_Init 2 */
+
+  /* USER CODE END USART1_Init 2 */
 
 }
 
@@ -105,5 +115,3 @@ void HAL_UART_MspDeInit(UART_HandleTypeDef* uartHandle)
 /* USER CODE BEGIN 1 */
 
 /* USER CODE END 1 */
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

From 5bba7ed28cc64529124fd6cf7aafa919f565f171 Mon Sep 17 00:00:00 2001
From: JochiSt <jochen.steinmann@web.de>
Date: Wed, 18 Jan 2023 13:56:46 +0100
Subject: [PATCH 2/8] added basic I2C slave function (not working yet)

---
 firmware/Src/i2c.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/firmware/Src/i2c.c b/firmware/Src/i2c.c
index 0dc2d07..3d71cbe 100644
--- a/firmware/Src/i2c.c
+++ b/firmware/Src/i2c.c
@@ -188,5 +188,44 @@ void HAL_I2C_MspDeInit(I2C_HandleTypeDef* i2cHandle)
 }
 
 /* USER CODE BEGIN 1 */
+// interrupt driven I2C RX and TX according to
+// https://www.mikrocontroller.net/topic/459202#6441255
+/*
+1. HAL_I2C_EnableListen_IT
+2. Der Master sendet die Nachricht
+3. HAL_I2C_AddrCallback kommt: Dort HAL_I2C_Slave_Receive_IT aufrufen
+4. HAL_I2C_SlaveRxCpltCallback
+5. HAL_I2C_ListenCpltCallback
+*/
+// gets called on address match
+void HAL_I2C_AddrCallback(I2C_HandleTypeDef *hi2c, uint8_t TransferDirection, uint16_t AddrMatchCode){
+  UNUSED(hi2c);
+  UNUSED(TransferDirection);
+  UNUSED(AddrMatchCode);
+
+  switch (TransferDirection) {
+    case I2C_DIRECTION_TRANSMIT:
+      //HAL_StatusTypeDef HAL_I2C_Slave_Receive_IT(I2C_HandleTypeDef *hi2c, uint8_t *pData, uint16_t Size);
+      break;
+
+    case I2C_DIRECTION_RECEIVE:
+      //HAL_StatusTypeDef HAL_I2C_Slave_Transmit_IT(I2C_HandleTypeDef *hi2c, uint8_t *pData, uint16_t Size);
+      break;
+  }
+}
+
+// gets called when RX / TX done
+void HAL_I2C_SlaveTxCpltCallback(I2C_HandleTypeDef *hi2c){
+  UNUSED(hi2c);
+}
+void HAL_I2C_SlaveRxCpltCallback(I2C_HandleTypeDef *hi2c){
+  UNUSED(hi2c);
+}
+//
+void HAL_I2C_ListenCpltCallback(I2C_HandleTypeDef *hi2c){
+  // (re-) enable the listen mode
+  HAL_I2C_EnableListen_IT(hi2c);
+}
+
 
 /* USER CODE END 1 */

From 385c0588f63c52f6e2cb828697a4b73031d618eb Mon Sep 17 00:00:00 2001
From: Jochen Steinmann <jochen.steinmann@web.de>
Date: Sun, 22 Jan 2023 16:50:24 +0100
Subject: [PATCH 3/8] moved include stdio.h to user code

---
 firmware/Src/i2c.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/firmware/Src/i2c.c b/firmware/Src/i2c.c
index 3d71cbe..d717377 100644
--- a/firmware/Src/i2c.c
+++ b/firmware/Src/i2c.c
@@ -20,7 +20,9 @@
 /* Includes ------------------------------------------------------------------*/
 #include "i2c.h"
 
+
 /* USER CODE BEGIN 0 */
+#include <stdio.h>
 
 /* USER CODE END 0 */
 

From 4d983c53f492e749961cc4b5cdebbe7dc05e8f20 Mon Sep 17 00:00:00 2001
From: Jochen Steinmann <jochen.steinmann@web.de>
Date: Sun, 22 Jan 2023 16:51:56 +0100
Subject: [PATCH 4/8] implemented fake EEPROM behavior

---
 firmware/Src/i2c.c | 64 +++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 58 insertions(+), 6 deletions(-)

diff --git a/firmware/Src/i2c.c b/firmware/Src/i2c.c
index d717377..b1f344e 100644
--- a/firmware/Src/i2c.c
+++ b/firmware/Src/i2c.c
@@ -24,6 +24,14 @@
 /* USER CODE BEGIN 0 */
 #include <stdio.h>
 
+enum I2CDeviceState {
+  /// initial state
+  STATE_INITIAL = 0,
+  /// receiving the first byte of word addr
+  STATE_RECEIVING_ADDRESS,
+  /// after the 2nd byte of word addr
+  STATE_HAVE_ADDRESS
+};
 /* USER CODE END 0 */
 
 I2C_HandleTypeDef hi2c1;
@@ -192,6 +200,8 @@ void HAL_I2C_MspDeInit(I2C_HandleTypeDef* i2cHandle)
 /* USER CODE BEGIN 1 */
 // interrupt driven I2C RX and TX according to
 // https://www.mikrocontroller.net/topic/459202#6441255
+// and
+// https://github.com/smx-smx/stm32-eeprom/blob/master/src/main.c
 /*
 1. HAL_I2C_EnableListen_IT
 2. Der Master sendet die Nachricht
@@ -199,32 +209,74 @@ void HAL_I2C_MspDeInit(I2C_HandleTypeDef* i2cHandle)
 4. HAL_I2C_SlaveRxCpltCallback
 5. HAL_I2C_ListenCpltCallback
 */
+
+/** eeprom data **/
+#define EEPROM_SIZE (1024)
+#define EEPROM_OFFSET(x) ((x) & (sizeof(ram) - 1))
+
+static uint8_t ram[EEPROM_SIZE];
+static uint16_t word_addr = 0;
+static enum I2CDeviceState state = STATE_INITIAL;
+static uint8_t word_addr_byte = 0;
+
 // gets called on address match
 void HAL_I2C_AddrCallback(I2C_HandleTypeDef *hi2c, uint8_t TransferDirection, uint16_t AddrMatchCode){
-  UNUSED(hi2c);
-  UNUSED(TransferDirection);
+
   UNUSED(AddrMatchCode);
 
   switch (TransferDirection) {
     case I2C_DIRECTION_TRANSMIT:
-      //HAL_StatusTypeDef HAL_I2C_Slave_Receive_IT(I2C_HandleTypeDef *hi2c, uint8_t *pData, uint16_t Size);
+      // master is sending, start first receive
+      // if the master is writing, it always writes the address first
+      if( HAL_I2C_Slave_Seq_Receive_IT(hi2c, &word_addr_byte, 1, I2C_NEXT_FRAME) != HAL_OK){
+        printf("I2C error: slave receive\r\n");
+      }
       break;
 
     case I2C_DIRECTION_RECEIVE:
-      //HAL_StatusTypeDef HAL_I2C_Slave_Transmit_IT(I2C_HandleTypeDef *hi2c, uint8_t *pData, uint16_t Size);
+      // master is receiving, start first transmit
+      word_addr = EEPROM_OFFSET(word_addr);
+      if( HAL_I2C_Slave_Seq_Transmit_IT(hi2c, &ram[word_addr], 1, I2C_NEXT_FRAME) != HAL_OK){
+        printf("I2C error: slave transmit\r\n");
+      }
       break;
   }
 }
 
 // gets called when RX / TX done
 void HAL_I2C_SlaveTxCpltCallback(I2C_HandleTypeDef *hi2c){
-  UNUSED(hi2c);
+  // we just sent something to the master
+
+  // offer the next eeprom byte (the master will NACK if it doesn't want it)
+  word_addr = EEPROM_OFFSET(word_addr + 1);
+  HAL_I2C_Slave_Seq_Transmit_IT(hi2c, &ram[word_addr], 1, I2C_NEXT_FRAME);
 }
+
+
 void HAL_I2C_SlaveRxCpltCallback(I2C_HandleTypeDef *hi2c){
-  UNUSED(hi2c);
+  // we just received something from the master
+  if(state == STATE_INITIAL){ // received byte0 of addr
+    // [DE] AD
+    // overwrite previous word_addr
+    word_addr = word_addr_byte << 8;
+    state = STATE_RECEIVING_ADDRESS;
+
+    // start to receive next addr byte
+    HAL_I2C_Slave_Seq_Receive_IT(hi2c, &word_addr_byte, 1, I2C_NEXT_FRAME);
+  } else {
+    if(state == STATE_RECEIVING_ADDRESS){ // received byte1 of addr
+      // DE [AD]
+      word_addr |= word_addr_byte;
+      state = STATE_HAVE_ADDRESS;
+    }
+    // handle next (or first) data RX
+    HAL_I2C_Slave_Seq_Receive_IT(hi2c, &ram[word_addr], 1, I2C_NEXT_FRAME);
+    word_addr = EEPROM_OFFSET(word_addr + 1);
+  }
 }
 //
 void HAL_I2C_ListenCpltCallback(I2C_HandleTypeDef *hi2c){
+  state = STATE_INITIAL;
   // (re-) enable the listen mode
   HAL_I2C_EnableListen_IT(hi2c);
 }

From d213120ed0572d1633e9d42d8e988e5e3c6e8d48 Mon Sep 17 00:00:00 2001
From: Jochen Steinmann <jochen.steinmann@web.de>
Date: Sun, 22 Jan 2023 16:52:16 +0100
Subject: [PATCH 5/8] start the I2C listening interrupt

---
 firmware/Src/main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/firmware/Src/main.c b/firmware/Src/main.c
index a127f78..2f74594 100644
--- a/firmware/Src/main.c
+++ b/firmware/Src/main.c
@@ -213,6 +213,10 @@ int main(void)
 	  Error_Handler();
   }
   /****************************************************************************/
+  // STARTING the I2C slave
+  printf("starting I2C slave...\r\n");
+  HAL_I2C_EnableListen_IT(&hi2c2);
+  /****************************************************************************/
   printf("starting TIM2...\r\n");
   HAL_TIM_Base_Start_IT(&htim2);
 

From 13da940ee421af8c7e0ccb931688570ea8e1b69e Mon Sep 17 00:00:00 2001
From: Jochen Steinmann <jochen.steinmann@web.de>
Date: Mon, 23 Jan 2023 10:16:12 +0100
Subject: [PATCH 6/8] disabled i2c_scan for I2C2

---
 firmware/Src/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/firmware/Src/main.c b/firmware/Src/main.c
index 2f74594..013d0ce 100644
--- a/firmware/Src/main.c
+++ b/firmware/Src/main.c
@@ -155,7 +155,7 @@ int main(void)
 
   // do an I2C scan of both I2C ports
   i2c_scan(&hi2c1);   // PORT 1
-  i2c_scan(&hi2c2);   // PORT 2
+  //i2c_scan(&hi2c2);   // PORT 2
 
   // all LEDs off
   LED_ERROR(SET);

From 1ff872ea46e5be17749ec1702da482846e0f1f15 Mon Sep 17 00:00:00 2001
From: Jochen Steinmann <jochen.steinmann@web.de>
Date: Mon, 23 Jan 2023 10:16:56 +0100
Subject: [PATCH 7/8] enable I2C error IRQ

---
 firmware/Inc/stm32f1xx_it.h |  1 +
 firmware/OpenFlowMeter.ioc  |  4 +++-
 firmware/Src/i2c.c          |  3 +++
 firmware/Src/stm32f1xx_it.c | 14 ++++++++++++++
 4 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/firmware/Inc/stm32f1xx_it.h b/firmware/Inc/stm32f1xx_it.h
index b1980e4..b7affe3 100644
--- a/firmware/Inc/stm32f1xx_it.h
+++ b/firmware/Inc/stm32f1xx_it.h
@@ -61,6 +61,7 @@ void USB_LP_CAN1_RX0_IRQHandler(void);
 void CAN1_RX1_IRQHandler(void);
 void TIM2_IRQHandler(void);
 void I2C2_EV_IRQHandler(void);
+void I2C2_ER_IRQHandler(void);
 /* USER CODE BEGIN EFP */
 
 /* USER CODE END EFP */
diff --git a/firmware/OpenFlowMeter.ioc b/firmware/OpenFlowMeter.ioc
index 90e7b13..78abd3d 100644
--- a/firmware/OpenFlowMeter.ioc
+++ b/firmware/OpenFlowMeter.ioc
@@ -48,7 +48,8 @@ Dma.Request0=ADC1
 Dma.RequestsNb=1
 File.Version=6
 GPIO.groupedBy=Group By Peripherals
-I2C2.IPParameters=OwnAddress
+I2C2.DualAddressMode=I2C_DUALADDRESS_DISABLE
+I2C2.IPParameters=OwnAddress,DualAddressMode
 I2C2.OwnAddress=0x20
 KeepUserPlacement=true
 Mcu.CPN=STM32F103C8T6
@@ -117,6 +118,7 @@ NVIC.DMA1_Channel1_IRQn=true\:0\:0\:false\:false\:true\:false\:true\:true
 NVIC.DebugMonitor_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:true
 NVIC.ForceEnableDMAVector=true
 NVIC.HardFault_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:true
+NVIC.I2C2_ER_IRQn=true\:0\:0\:false\:false\:true\:true\:true\:true
 NVIC.I2C2_EV_IRQn=true\:0\:0\:false\:false\:true\:true\:true\:true
 NVIC.MemoryManagement_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:true
 NVIC.NonMaskableInt_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:true
diff --git a/firmware/Src/i2c.c b/firmware/Src/i2c.c
index b1f344e..2db2a1d 100644
--- a/firmware/Src/i2c.c
+++ b/firmware/Src/i2c.c
@@ -144,6 +144,8 @@ void HAL_I2C_MspInit(I2C_HandleTypeDef* i2cHandle)
     /* I2C2 interrupt Init */
     HAL_NVIC_SetPriority(I2C2_EV_IRQn, 0, 0);
     HAL_NVIC_EnableIRQ(I2C2_EV_IRQn);
+    HAL_NVIC_SetPriority(I2C2_ER_IRQn, 0, 0);
+    HAL_NVIC_EnableIRQ(I2C2_ER_IRQn);
   /* USER CODE BEGIN I2C2_MspInit 1 */
 
   /* USER CODE END I2C2_MspInit 1 */
@@ -191,6 +193,7 @@ void HAL_I2C_MspDeInit(I2C_HandleTypeDef* i2cHandle)
 
     /* I2C2 interrupt Deinit */
     HAL_NVIC_DisableIRQ(I2C2_EV_IRQn);
+    HAL_NVIC_DisableIRQ(I2C2_ER_IRQn);
   /* USER CODE BEGIN I2C2_MspDeInit 1 */
 
   /* USER CODE END I2C2_MspDeInit 1 */
diff --git a/firmware/Src/stm32f1xx_it.c b/firmware/Src/stm32f1xx_it.c
index 0a43d65..f76574c 100644
--- a/firmware/Src/stm32f1xx_it.c
+++ b/firmware/Src/stm32f1xx_it.c
@@ -272,6 +272,20 @@ void I2C2_EV_IRQHandler(void)
   /* USER CODE END I2C2_EV_IRQn 1 */
 }
 
+/**
+  * @brief This function handles I2C2 error interrupt.
+  */
+void I2C2_ER_IRQHandler(void)
+{
+  /* USER CODE BEGIN I2C2_ER_IRQn 0 */
+
+  /* USER CODE END I2C2_ER_IRQn 0 */
+  HAL_I2C_ER_IRQHandler(&hi2c2);
+  /* USER CODE BEGIN I2C2_ER_IRQn 1 */
+
+  /* USER CODE END I2C2_ER_IRQn 1 */
+}
+
 /* USER CODE BEGIN 1 */
 
 /* USER CODE END 1 */

From fee3a9b6b6fdc6b02a92b0f57e17568809e8aba1 Mon Sep 17 00:00:00 2001
From: Jochen Steinmann <jochen.steinmann@web.de>
Date: Mon, 23 Jan 2023 10:18:32 +0100
Subject: [PATCH 8/8] changed to config

---
 firmware/Src/i2c.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/firmware/Src/i2c.c b/firmware/Src/i2c.c
index 2db2a1d..f00d0e5 100644
--- a/firmware/Src/i2c.c
+++ b/firmware/Src/i2c.c
@@ -214,10 +214,9 @@ void HAL_I2C_MspDeInit(I2C_HandleTypeDef* i2cHandle)
 */
 
 /** eeprom data **/
-#define EEPROM_SIZE (1024)
-#define EEPROM_OFFSET(x) ((x) & (sizeof(ram) - 1))
+#define EEPROM_OFFSET(x) ((x) & (sizeof(cfg) - 1))
+uint8_t *cfg_ptr = (uint8_t*)&cfg;
 
-static uint8_t ram[EEPROM_SIZE];
 static uint16_t word_addr = 0;
 static enum I2CDeviceState state = STATE_INITIAL;
 static uint8_t word_addr_byte = 0;
@@ -239,7 +238,7 @@ void HAL_I2C_AddrCallback(I2C_HandleTypeDef *hi2c, uint8_t TransferDirection, ui
     case I2C_DIRECTION_RECEIVE:
       // master is receiving, start first transmit
       word_addr = EEPROM_OFFSET(word_addr);
-      if( HAL_I2C_Slave_Seq_Transmit_IT(hi2c, &ram[word_addr], 1, I2C_NEXT_FRAME) != HAL_OK){
+      if( HAL_I2C_Slave_Seq_Transmit_IT(hi2c, &cfg_ptr[word_addr], 1, I2C_NEXT_FRAME) != HAL_OK){
         printf("I2C error: slave transmit\r\n");
       }
       break;
@@ -252,7 +251,7 @@ void HAL_I2C_SlaveTxCpltCallback(I2C_HandleTypeDef *hi2c){
 
   // offer the next eeprom byte (the master will NACK if it doesn't want it)
   word_addr = EEPROM_OFFSET(word_addr + 1);
-  HAL_I2C_Slave_Seq_Transmit_IT(hi2c, &ram[word_addr], 1, I2C_NEXT_FRAME);
+  HAL_I2C_Slave_Seq_Transmit_IT(hi2c, &cfg_ptr[word_addr], 1, I2C_NEXT_FRAME);
 }
 
 
@@ -273,7 +272,7 @@ void HAL_I2C_SlaveRxCpltCallback(I2C_HandleTypeDef *hi2c){
       state = STATE_HAVE_ADDRESS;
     }
     // handle next (or first) data RX
-    HAL_I2C_Slave_Seq_Receive_IT(hi2c, &ram[word_addr], 1, I2C_NEXT_FRAME);
+    HAL_I2C_Slave_Seq_Receive_IT(hi2c, &cfg_ptr[word_addr], 1, I2C_NEXT_FRAME);
     word_addr = EEPROM_OFFSET(word_addr + 1);
   }
 }