STM32F103C8 SPI1 MOSI ISSIE

[MSkor.1]

Hi

I try to run SPI 1 on STM32F103C8 but when i send data i have only SCK signal. MOSI(PB5) is in high state (dont change).

 SPI2 on PORTA works grate.

void MX_SPI1_Init(void)
{
 
  /* USER CODE BEGIN SPI1_Init 0 */
 
  /* USER CODE END SPI1_Init 0 */
 
  /* USER CODE BEGIN SPI1_Init 1 */
 
  /* USER CODE END SPI1_Init 1 */
  hspi1.Instance = SPI1;
  hspi1.Init.Mode = SPI_MODE_MASTER;
  hspi1.Init.Direction = SPI_DIRECTION_2LINES;
  hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi1.Init.NSS = SPI_NSS_SOFT;
  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32;
  hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi1.Init.CRCPolynomial = 10;
  if (HAL_SPI_Init(&hspi1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN SPI1_Init 2 */
  LL_GPIO_AF_Remap_SWJ_NOJTAG();
  while((AFIO->MAPR & AFIO_MAPR_SWJ_CFG_JTAGDISABLE) != AFIO_MAPR_SWJ_CFG_JTAGDISABLE);
  /* USER CODE END SPI1_Init 2 */
 
}
 
void HAL_SPI_MspInit(SPI_HandleTypeDef* spiHandle)
{
 
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(spiHandle->Instance==SPI1)
  {
  /* USER CODE BEGIN SPI1_MspInit 0 */
 
  /* USER CODE END SPI1_MspInit 0 */
    /* SPI1 clock enable */
    __HAL_RCC_SPI1_CLK_ENABLE();
 
    __HAL_RCC_GPIOB_CLK_ENABLE();
    /**SPI1 GPIO Configuration
    PB3     ------> SPI1_SCK
    PB4     ------> SPI1_MISO
    PB5     ------> SPI1_MOSI
    */
    GPIO_InitStruct.Pin = GPIO_PIN_3|GPIO_PIN_5;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
    GPIO_InitStruct.Pin = GPIO_PIN_4;
    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
    __HAL_AFIO_REMAP_SPI1_ENABLE();
 
  /* USER CODE BEGIN SPI1_MspInit 1 */
 
  /* USER CODE END SPI1_MspInit 1 */
  }
}

  for (uint16_t x=0; x<254; x++){
	  uint8_t chr = 0x55;
	  HAL_SPI_Transmit(&hspi1, &chr, 1, 1);
	  HAL_Delay(10);
	  HAL_GPIO_WritePin(PORT_LD, PIN_LD, SET);
	  HAL_Delay(1);
	  HAL_GPIO_WritePin(PORT_LD, PIN_LD, RESET);
          HAL_Delay(1);
  }

[waclawek.jan]

> __HAL_AFIO_REMAP_SPI1_ENABLE();

You need to enable AFIO clock in RCC for this to work.

JW

[MSkor.1]

__HAL_AFIO_REMAP_SPI1_ENABLE(); is enable by HAL

    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
    __HAL_AFIO_REMAP_SPI1_ENABLE();
 
  /* USER CODE BEGIN SPI1_MspInit 1 */
 
  /* USER CODE END SPI1_MspInit 1 */
  }
}

[waclawek.jan]

Try a simple program, which sets PB5 as a GPIO output and toggle it in program.

(In other words, check if PB5 is properly connected).

JW

[MSkor.1]

Yes I check this at first time. 

HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, RESET);

HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, SET);

works ok (whene SPI1 is disabled)

I also replase MCU to new one.

[MSkor.1]

Ok

I found out what is causing the problem.

you can't have I2C1 enabled with SPI1 even if I2C1 pins are remapped

any way to bypass this problem?

[waclawek.jan]

> any way to bypass this problem?

Probably not in an easy way.

 

If you use I2C as master, you can try to bit-bang it.

You can consider using a different pin-compatible STM32.

JW