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Код: Выделить всё

/**
  * @brief  Transmits a Data through the SPIx/I2Sx peripheral.
  * @param  SPIx: where x can be
  *   - 1, 2 or 3 in SPI mode 
  *   - 2 or 3 in I2S mode
  * @param  Data : Data to be transmitted.
  * @retval None
  */
void SPI_I2S_SendData(SPI_TypeDef* SPIx, uint16_t Data)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  
  /* Write in the DR register the data to be sent */
  SPIx->DR = Data;
}

Код: Выделить всё

        LDR.N    R0,??DataTable1  ;; 0x4001300c
//*(volatile uint16_t *)&SPI1->DR = 0xAABB;        
        MOVW     R1,#+43707
        STRH     R1,[R0, #+0]
//*(volatile uint8_t *)&SPI1->DR = 0xAA;  
        MOVS     R2,#+170
        STRB     R2,[R0, #+0]

Код: Выделить всё

      if (hspi->TxXferCount > 1U)
      {
        /* write on the data register in packing mode */
        hspi->Instance->DR = *((uint16_t *)pData);
        pData += sizeof(uint16_t);
        hspi->TxXferCount -= 2U;
      }
      else
      {
        *((__IO uint8_t *)&hspi->Instance->DR) = (*pData++);
        hspi->TxXferCount--;
      }
....
  /* Set the Rx Fifo threshold */
  if (hspi->Init.DataSize > SPI_DATASIZE_8BIT)
  {
    /* Set RX Fifo threshold according the reception data length: 16bit */
    CLEAR_BIT(hspi->Instance->CR2, SPI_RXFIFO_THRESHOLD);
  }
  else
  {
    /* Set RX Fifo threshold according the reception data length: 8bit */
    SET_BIT(hspi->Instance->CR2, SPI_RXFIFO_THRESHOLD);
  }

Код: Выделить всё

  template<uint32_t dmask>
  static _inline_ void writeReg32(volatile uint32_t* reg, uint32_t value)
  {    
    if constexpr (dmask == 0xFFFFFFFF) 
      *reg = value;
    else if constexpr (dmask == 0x0000FFFF) 
      *(volatile uint16_t*)reg = value;
    else if constexpr (dmask == 0xFFFF0000) 
      *((volatile uint16_t*)reg + 1) = value >> 16;
    else if constexpr (dmask == 0x000000FF)
      *(volatile uint8_t*)reg = value;
    else if constexpr (dmask == 0x0000FF00)
      *((volatile uint8_t*)reg + 1) = value >> 8;
    else if constexpr (dmask == 0x00FF0000)
      *((volatile uint8_t*)reg + 2) = value >> 16;
    else if constexpr (dmask == 0xFF000000)
      *((volatile uint8_t*)reg + 3) = value >> 24;
    else
      *reg = (*reg & ~dmask) | value;
  }

Код: Выделить всё

*reg = (*reg & ~((uint32_t)0x0000FFFF)) | (value & 0x0000FFFF)