Why ux_slave_class_name of ux_slave_interface_next_interface is NULL? #7
Description
Describe the set-up
I try to migrate USBX CDC ACM to STM32F407ZGT6. Now USB Device can be recognized by Computer as STM32 USB Device.
But I can't read any data from PC host. And I found ux_utility_memory_compare is not right.
/* Compares two memory blocks ux_slave_class_name and _ux_system_slave_class_cdc_acm_name */
ux_status = ux_utility_memory_compare(data_interface->ux_slave_interface_class->ux_slave_class_name,
_ux_system_slave_class_cdc_acm_name,
ux_utility_string_length_get(_ux_system_slave_class_cdc_acm_name));ux_status is always return 255. data_interface->ux_slave_interface_class is NULL.
The full read code is like:
void usbx_cdc_acm_read_thread_entry(ULONG arg)
{
UX_SLAVE_DEVICE *device;
UX_SLAVE_INTERFACE *data_interface;
UX_SLAVE_CLASS_CDC_ACM *cdc_acm;
ULONG actual_length;
ULONG ux_status = UX_SUCCESS;
ULONG senddataflag = 0;
/* Get device */
device = &_ux_system_slave->ux_system_slave_device;
while (1)
{
/* Check if device is configured */
if (device->ux_slave_device_state == UX_DEVICE_CONFIGURED)
{
/* Get Data interface */
data_interface = device->ux_slave_device_first_interface->ux_slave_interface_next_interface;
/* Compares two memory blocks ux_slave_class_name and _ux_system_slave_class_cdc_acm_name */
ux_status = ux_utility_memory_compare(data_interface->ux_slave_interface_class->ux_slave_class_name,
_ux_system_slave_class_cdc_acm_name,
ux_utility_string_length_get(_ux_system_slave_class_cdc_acm_name));
/* Check Compares success */
if (ux_status == UX_SUCCESS)
{
cdc_acm = data_interface->ux_slave_interface_class_instance;
/* Set transmission_status to UX_FALSE for the first time */
cdc_acm -> ux_slave_class_cdc_acm_transmission_status = UX_FALSE;
/* Read the received data in blocking mode */
ux_device_class_cdc_acm_read(cdc_acm, (UCHAR *)UserRxBufferFS, 3,
&actual_length);
if (actual_length != 0)
{
/* Send the data via UART */
// if (HAL_UART_Transmit_DMA(&huart3, (uint8_t *)UserRxBufferFS,
// actual_length) != HAL_OK)
// {
// /* Transfer error in reception process */
// Error_Handler();
// }
/* Wait until the requested flag TX_NEW_TRANSMITTED_DATA is received */
if (tx_event_flags_get(&EventFlag, TX_NEW_TRANSMITTED_DATA, TX_OR_CLEAR,
&senddataflag, TX_WAIT_FOREVER) != TX_SUCCESS)
{
Error_Handler();
}
}
}
}
else
{
tx_thread_sleep(1);
}
}
}STM32CUBEMX 6.6.1
Firmware FW_F4_V1.27.0
Question
Are there any reasons for "next interface.ux_slave_class_name is NULL"? I can't find any error in my code. Because USB device has been configured correctly. ux_app_parameters_change(VOID *cdc_acm) is also called when connected.
Screenshots
Here is my cubemx screenshots.
