Nucleo STM32F411 pins not working when alternate functions

[RBran.3]

It seems that I'm having problems with the pins configured as alternate function.

If I configure the same pins used by SPI or USART as simple gpio outputs, I can see them toggling with the logic analyser. but when I configure them as SPI (alternate function) or USART they are not working as expected. I have tried changing SPI creating an stm32 project, configuring the pins through the GUI and using the HAL_APIs. the result is the same : I can see the pins toggle when configured as gpio outputs, I can't see anything when configured as SP or USART.

I have checked with the debug and the SPI and USART registers are configured as expected.

am I missing something?

[waclawek.jan]

> I have checked with the debug and the SPI and USART registers are configured as expected.

Post, together with the relevant GPIO registers content.

JW

[RBran.3]

  this is the code I used for test:

HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_SET);
 
  uart_buf_len=sprintf(uart_buf, "SPI Test\n");
 
  HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, uart_buf_len, 100);
 
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_RESET);
 
  HAL_SPI_Transmit(&hspi1, (uint8_t *)uart_buf, uart_buf_len, 100);
 
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_SET);

the only thing that I see changing in the logic analyser is the PB6

[RBran.3]

with the code above I connected TeraTerm using ST-Link virtual com. I can see the message displayed in the console:

 

but the logic analyser on pins PA2 and PA3 shows no traffic

[waclawek.jan]

Then the logic analyzer is not connected to pins PA2 and PA3.

They may be brought out to the pinheaders through jumpers/solder bridges which are not connected by default.

 

JW

[RBran.3]

I managed to make it work using USART1 on pins pa9 and pa10 and SP1 on pins pa5,pa6,pa7 and pb6 (/CS)