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王平

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HAL库SPI DMA批量传输数据量最大为2^16，有没有办法改成上限为2^32？

HAL库SPI DMA批量传输数据量最大为2^16，有没有办法改成上限为2^32

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邱敏

2025-3-8 10:51:04
实际上传输数量是受到硬件约束，硬件寄存器就是16位的。

如果超过65565后，可以试试使用循环模式。

利用办半完成中断和全部完成中断来做相应的处理。
当然处理的时间要小于一半的时间。
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旧念

2025-3-10 17:43:56

在使用STM32的HAL库进行SPI DMA传输时，默认情况下，DMA传输的数据量是受限于DMA传输计数器的位宽。对于STM32的DMA控制器，通常传输计数器的位宽是16位，因此单次DMA传输的最大数据量为2^16（即65536字节）。


如果你希望实现更大的数据传输（例如2^32字节），可以考虑以下几种方法：


1. 分段传输


你可以将大数据传输分成多个小段，每段的数据量不超过2^16字节。在每次DMA传输完成后，通过DMA传输完成中断或回调函数来启动下一段传输。这种方法不需要修改硬件或库，但需要在软件中进行额外的处理。


   #define MAX_DMA_TRANSFER_SIZE 65536



   void SPI_Transmit_DMA_Large(SPI_HandleTypeDef *hspi, uint8_t *pData, uint32_t Size)

   {

       uint32_t remainingSize = Size;

       uint8_t *pCurrentData = pData;



       while (remainingSize > 0)

       {

           uint16_t transferSize = (remainingSize > MAX_DMA_TRANSFER_SIZE) ? MAX_DMA_TRANSFER_SIZE : remainingSize;

           HAL_SPI_Transmit_DMA(hspi, pCurrentData, transferSize);

           pCurrentData += transferSize;

           remainingSize -= transferSize;



           // 等待当前传输完成

           while (HAL_SPI_GetState(hspi) != HAL_SPI_STATE_READY);

       }

   }

2. 使用双缓冲模式


某些STM32系列支持DMA的双缓冲模式。你可以配置两个DMA缓冲区，当一个缓冲区正在传输时，另一个缓冲区可以准备下一批数据。通过这种方式，可以实现连续的大数据传输。


3. 使用硬件特性


某些STM32系列（如STM32F4、STM32F7、STM32H7等）的DMA控制器支持更大的传输计数器位宽（例如32位）。如果你的STM32芯片支持更大的DMA传输计数器，你可以直接配置DMA传输计数器的位宽为32位。


例如，在STM32H7系列中，DMA传输计数器可以配置为32位。你可以通过修改DMA初始化代码来设置更大的传输计数器：




   hdma_spi_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;

   hdma_spi_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

   hdma_spi_tx.Init.Mode = DMA_NORMAL;

   hdma_spi_tx.Init.Priority = DMA_PRIORITY_HIGH;

   hdma_spi_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

   hdma_spi_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;

   hdma_spi_tx.Init.MemBurst = DMA_MBURST_SINGLE;

   hdma_spi_tx.Init.PeriphBurst = DMA_PBURST_SINGLE;

   hdma_spi_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

   hdma_spi_tx.Init.PeriphInc = DMA_PINC_DISABLE;

   hdma_spi_tx.Init.MemInc = DMA_MINC_ENABLE;

   hdma_spi_tx.Init.DataAlignment = DMA_PDATAALIGN_BYTE;

   hdma_spi_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

   hdma_spi_tx.Init.Mode = DMA_NORMAL;

   hdma_spi_tx.Init.Priority = DMA_PRIORITY_HIGH;

   hdma_spi_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

   hdma_spi_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;

   hdma_spi_tx.Init.MemBurst = DMA_MBURST_SINGLE;

   hdma_spi_tx.Init.PeriphBurst = DMA_PBURST_SINGLE;

   hdma_spi_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

   hdma_spi_tx.Init.PeriphInc = DMA_PINC_DISABLE;

   hdma_spi_tx.Init.MemInc = DMA_MINC_ENABLE;

   hdma_spi_tx.Init.DataAlignment = DMA_PDATAALIGN_BYTE;

   hdma_spi_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

   hdma_spi_tx.Init.Mode = DMA_NORMAL;

   hdma_spi_tx.Init.Priority = DMA_PRIORITY_HIGH;

   hdma_spi_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

   hdma_spi_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;

   hdma_spi_tx.Init.MemBurst = DMA_MBURST_SINGLE;

   hdma_spi_tx.Init.PeriphBurst = DMA_PBURST_SINGLE;

   hdma_spi_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

   hdma_spi_tx.Init.PeriphInc = DMA_PINC_DISABLE;

   hdma_spi_tx.Init.MemInc = DMA_MINC_ENABLE;

   hdma_spi_tx.Init.DataAlignment = DMA_PDATAALIGN_BYTE;

   hdma_spi_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

   hdma_spi_tx.Init.Mode = DMA_NORMAL;

   hdma_spi_tx.Init.Priority = DMA_PRIORITY_HIGH;

   hdma_spi_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

   hdma_spi_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;

   hdma_spi_tx.Init.MemBurst = DMA_MBURST_SINGLE;

   hdma_spi_tx.Init.PeriphBurst = DMA_PBURST_SINGLE;

   hdma_spi_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

   hdma_spi_tx.Init.PeriphInc = DMA_PINC_DISABLE;

   hdma_spi_tx.Init.MemInc = DMA_MINC_ENABLE;

   hdma_spi_tx.Init.DataAlignment = DMA_PDATAALIGN_BYTE;

   hdma_spi_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

   hdma_spi_tx.Init.Mode = DMA_NORMAL;

   hdma_spi_tx.Init.Priority = DMA_PRIORITY_HIGH;

   hdma_spi_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

   hdma_spi_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;

   hdma_spi_tx.Init.MemBurst = DMA_MBURST_SINGLE;

   hdma_spi_tx.Init.PeriphBurst = DMA_PBURST_SINGLE;

   hdma_spi_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

   hdma_spi_tx.Init.PeriphInc = DMA_PINC_DISABLE;

   hdma_spi_tx.Init.MemInc = DMA_MINC_ENABLE;

   hdma_spi_tx.Init.DataAlignment = DMA_PDATAALIGN_BYTE;

   hdma_spi_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

   hdma_spi_tx.Init.Mode = DMA_NORMAL;

   hdma_spi_tx.Init.Priority = DMA_PRIORITY_HIGH;

   hdma_spi_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

   hdma_spi_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;

   hdma_spi_tx.Init.MemBurst = DMA_MBURST_SINGLE;

   hdma_spi_tx.Init.PeriphBurst = DMA_PBURST_SINGLE;

   hdma_spi_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

   hdma_spi_tx.Init.PeriphInc = DMA_PINC_DISABLE;

   hdma_spi_tx.Init.MemInc = DMA_MINC_ENABLE;

   hdma_spi_tx.Init.DataAlignment = DMA_PDATAALIGN_BYTE;

   hdma_spi_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

   hdma_spi_tx.Init.Mode = DMA_NORMAL;

   hdma_spi_tx.Init.Priority = DMA_PRIORITY_HIGH;

   hdma_spi_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

   hdma_spi_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;

   hdma_spi_tx.Init.MemBurst = DMA_MBURST_SINGLE;

   hdma_spi_tx.Init.PeriphBurst = DMA_PBURST_SINGLE;

   hdma_spi_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

   hdma_spi_tx.Init.PeriphInc = DMA_PINC_DISABLE;

   hdma_spi_tx.Init.MemInc = DMA_MINC_ENABLE;

   hdma_spi_tx.Init.DataAlignment = DMA_PDATAALIGN_BYTE;

   hdma_spi_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

   hdma_spi_tx.Init.Mode = DMA_NORMAL;

   hdma_spi_tx.Init.Priority = DMA_PRIORITY_HIGH;

   hdma_spi_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

   hdma_spi_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;

   hdma_spi_tx.Init.MemBurst = DMA_MBURST_SINGLE;

   hdma_spi_tx.Init.PeriphBurst = DMA_PBURST_SINGLE;

   hdma_spi_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

   hdma_spi_tx.Init.PeriphInc = DMA_PINC_DISABLE;

   hdma_spi_tx.Init.MemInc = DMA_MINC_ENABLE;

   hdma_spi_tx.Init.DataAlignment = DMA_PDATAALIGN_BYTE;

   hdma_spi_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

   hdma_spi_tx.Init.Mode = DMA_NORMAL;

   hdma_spi_tx.Init.Priority = DMA_PRIORITY_HIGH;

   hdma_spi_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

   hdma_spi_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;

   hdma_spi_tx.Init.MemBurst = DMA_MBURST_SINGLE;

   hdma_spi_tx.Init.PeriphBurst = DMA_PBURST_SINGLE;

   hdma_spi_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

   hdma_spi_tx.Init.PeriphInc = DMA_PINC_DISABLE;

   hdma_spi_tx.Init.MemInc = DMA_MINC_ENABLE;

   hdma_spi_tx.Init.DataAlignment = DMA_PDATAALIGN_BYTE;

   hdma_spi_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

   hdma_spi_tx.Init.Mode = DMA_NORMAL;

   hdma_spi_tx.Init.Priority = DMA_PRIORITY_HIGH;

   hdma_spi_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

   hdma_spi_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;

   hdma_spi_tx.Init.MemBurst = DMA_MBURST_SINGLE;

   hdma_spi_tx.Init.PeriphBurst = DMA_PBURST_SINGLE;

   hdma_spi_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

   hdma_spi_tx.Init.PeriphInc = DMA_PINC_DISABLE;

   hdma_spi_tx.Init.MemInc = DMA_MINC_ENABLE;

   hdma_spi_tx.Init.DataAlignment = DMA_PDATAALIGN_BYTE;

   hdma_spi_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

   hdma_spi_tx.Init.Mode = DMA_NORMAL;

   hdma_spi_tx.Init.Priority = DMA_PRIORITY_HIGH;

   hdma_spi_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

   hdma_spi_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;

   hdma_spi_tx.Init.MemBurst = DMA_MBURST_SINGLE;

   hdma_spi_tx.Init.PeriphBurst = DMA_PBURST_SINGLE;

   hdma_spi_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

   hdma_spi_tx.Init.PeriphInc = DMA_PINC_DISABLE;

   hdma_spi_tx.Init.MemInc = DMA_MINC_ENABLE;

   hdma_spi_tx.Init.DataAlignment = DMA_PDATAALIGN_BYTE;

   hdma_spi_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

   hdma_spi_tx.Init.Mode = DMA_NORMAL;

   hdma_spi_tx.Init.Priority = DMA_PRIORITY_HIGH;

   hdma_spi_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

   hdma_spi_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;

   hdma_spi_tx.Init.MemBurst = DMA_MBURST_SINGLE;

   hdma_spi_tx.Init.PeriphBurst = DMA_PBURST_SINGLE;

   hdma_spi_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

   hdma_spi_tx.Init.PeriphInc = DMA_PINC_DISABLE;

   hdma_spi_tx.Init.MemInc = DMA_MINC_ENABLE;

   hdma_spi_tx.Init.DataAlignment = DMA_PDATAALIGN_BYTE;

   hdma_spi_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

   hdma_spi_tx.Init.Mode = DMA_NORMAL;

   hdma_spi_tx.Init.Priority = DMA_PRIORITY_HIGH;

   hdma_spi_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

   hdma_spi_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;

   hdma_spi_tx.Init.MemBurst = DMA_MBURST_SINGLE;

   hdma_spi_tx.Init.PeriphBurst = DMA_PBURST_SINGLE;

   hdma_spi_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

   hdma_spi_tx.Init.PeriphInc = DMA_PINC_DISABLE;

   hdma_spi_tx.Init.MemInc = DMA_MINC_ENABLE;

   hdma_spi_tx.Init.DataAlignment = DMA_PDATAALIGN_BYTE;

   hdma_spi_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

   hdma_spi_tx.Init.Mode = DMA_NORMAL;

   hdma_spi_tx.Init.Priority = DMA_PRIORITY_HIGH;

   hdma_spi_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

   hdma_spi_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;

   hdma_spi_tx.Init.MemBurst = DMA_MBURST_SINGLE;

   hdma_spi_tx.Init.PeriphBurst = DMA_PBURST_SINGLE;

   hdma_spi_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;

   hdma_spi_tx.Init.PeriphInc = DMA_PINC_DISABLE;

   hdma_spi_tx.Init.MemInc = DMA_MINC_ENABLE;

   hdma_spi_tx.Init.DataAlignment = DMA_PDATAALIGN_BYTE;

   hdma_spi_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

   hdma_spi_tx.Init.Mode = DMA_NORMAL;

   hdma_spi_tx.Init.Priority = DMA_PRIORITY_HIGH;

   hdma_spi_tx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

   hdma_spi_tx.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;

   hdma_spi_tx.Init.MemBurst = DMA_MBURST_SINGLE;

   hdma_spi
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