Nucleo STM32F411 pins not working when alternate functions

Forum|Forum|5 years ago
June 23, 2021
5 replies
1641 views

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?

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waclawek.jan

Super User

> 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.3Author

Associate

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