How to switch the DMA buffer in HAL_SPI_Transmit_DMA

[Wechmarer]

While output data from DMA to SPI it should be able to use two buffers. One for the current transfer, one to write data.

But how do I switch between the buffers?

#define BUFFER_SIZE 10
uint8_t txBuffer[BUFFER_SIZE + BUFFER_SIZE];
HAL_SPI_Transmit_DMA(&hspi2, (uint8_t*)txBuffer, BUFFER_SIZE);
 
void HAL_SPI_TxHalfCpltCallback(SPI_HandleTypeDef *hspi)
{
  int value = 0;
  if (txBufferHalf == 0) {
    for (unsigned int i = 0; i < BUFFER_SIZE; ++i) {
        txBuffer[i] = ++value;
    }
    txBufferHalf = 1;
  }
  else
  {
    for (unsigned int i = 0; i < BUFFER_SIZE; ++i) {
        txBuffer[i + BUFFER_SIZE] = ++value + 100;
    }
    txBufferHalf = 0;
  }
}

[Wechmarer · Accepted solution]

Solved. Has to use both HAL_SPI_TxHalfCpltCallback and HAL_SPI_TxCpltCallback