ADC on G474CE

[beaka]

I am getting all 0 on printing ov analogread on the code below:
`void setup() {
// put your setup code here, to run once:
delay(20);
Serial.begin(115200);
while (!Serial);
delay(500);
Serial.println();
Serial.print("SETUP: ");
Serial.println(BOARD_NAME);
Serial.print("FLASH->ACR = 0x");Serial.println(FLASH->ACR,HEX);
Serial.print("SystemCoreClock: ");
Serial.println(SystemCoreClock);
Serial.print("F_CPU: ");
Serial.println(F_CPU);
Serial.printf("RCC_CR 0x%08X \n", RCC->CR);
Serial.printf("RCC_CFGR 0x%08X \n", RCC->CFGR);
Serial.printf("RCC_PLLCFGR 0x%08X \n", RCC->PLLCFGR);

pinMode(PA3, INPUT_ANALOG);
}

void loop() {
// put your main code here, to run repeatedly:
static int outval = 0;
analogWrite(A2,outval); /* full range 0-255 /
outval += 10;
if (outval > 255) outval = 0;
delay(10);
String message = "Vb = ";
//int VB= analogRead(PA3); / full range 0-1024 /
int VB= digitalRead(PA10); / full range 0-1024 */
//int VA= analogInputToDigitalPin(p)
//message += VB;
//Serial.println(analogRead(PA0));
Serial.println(VB);
//Serial.println(message);
delay(100);
}`
I have VREF wired to 3.3V and A2 connected to the relevant input pin but no value is shown on analogread.
The value toggles on digitalread on any of the pins tried.

Is there anything else needs to be done.

[fpistm]

PA10 is not an ADC pin.
PinMode is not needed.

[beaka]

I tried PA0 to PA10 and none worked. I put up a longer post detailing that I tried all the pins but it did not seem to get posted. I tried many pins and none worked for analogread. Many worked for digitalread. The mapping on the Weact G474 long board is not very comprehensive linking the board markings to the pin descriptors eg: what is A0 on the board, is it PA0? Odd how the same code with different pin designations and the STM32 register printouts works for AVR and ESP chips.

…

On Mon, 28 Jul 2025 at 03:48, Frederic Pillon ***@***.***> wrote: PA10 is not an ADC pin. PinMode is not needed. — Reply to this email directly, view it on GitHub <#2778 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAF56IXIKLSYZW4CBOI6WMT3KUGGRAVCNFSM6AAAAACCO7SG4GVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTGOJQGI4DONI> . You are receiving this because you authored the thread.Message ID: <stm32duino/Arduino_Core_STM32/repo-discussions/2778/comments/13902875@ github.com>

[fpistm]

Well, again I've tested and it works.
If it always return 0 this means you got an error.
Since some weeks you opened discussion around compile, execution issue but all are invalid. It seems you do some changes or do not use Arduino as expected and it is a mess to try to help you as you do not tell us your real configuration, installation, ... And what you exactly do.
So, sorry but I can't help without those information.
All issue you met are basics features and know to works out of the box.