spi_dma_common.c

00001 #include "spi_dma.h"
00002 #include "PeripheralPins.h"
00003 
00004 DMA_HandleTypeDef hdma_spi_tx;
00005 DMA_HandleTypeDef hdma_spi_rx;
00006 SPI_HandleTypeDef SpiHandle;
00007 
00008 static void spi_dma_error_handler(void)
00009 {
00010   while(1)
00011   { 
00012     /* infinite loop */
00013   }
00014 }
00015 
00016 static void spi_dma_start( SPI_TypeDef *spi, uint8_t *txbuff, uint8_t *rxbuff, uint16_t count)
00017 {
00018     (void)spi;
00019     if( HAL_SPI_TransmitReceive_DMA( &SpiHandle, (uint8_t *)txbuff, (uint8_t *)rxbuff, count) != HAL_OK) {
00020         spi_dma_error_handler();
00021     }
00022 }
00023 
00024 static void spi_dma_wait_end( SPI_TypeDef *spi )
00025 {
00026     (void)spi;
00027     while (HAL_SPI_GetState( &SpiHandle ) != HAL_SPI_STATE_READY) {
00028         /* just wait */ 
00029     } 
00030 }
00031 
00032 static void spi_dma_deinit( SPI_TypeDef *spi)
00033 {
00034     (void)spi;
00035     HAL_DMA_DeInit( &hdma_spi_tx);
00036     HAL_DMA_DeInit( &hdma_spi_rx);
00037 }
00038 
00039 SPI_TypeDef *spi_get_id( PinName mosi, PinName miso, PinName sclk, PinName ssel) {
00040     // Determine the SPI to use
00041     SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
00042     SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
00043     SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
00044     SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
00045 
00046     SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
00047     SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
00048 
00049     return (SPI_TypeDef *) ( (SPIName)pinmap_merge(spi_data, spi_cntl) );
00050 }
00051 
00052 void spi_dma_init( SPI_TypeDef *spi ) {
00053     spi_dma_irq_setup( spi );
00054     spi_dma_get_info(  spi );
00055 }
00056 
00057 void __spi_dma_read_write( SPI_TypeDef *spi, uint8_t *txbuff, uint8_t *rxbuff, uint16_t count, uint8_t mode)
00058 {
00059     spi_dma_handle_setup( spi, mode );  
00060     spi_dma_start( spi, txbuff, rxbuff, count );
00061     spi_dma_wait_end( spi );
00062     spi_dma_deinit(spi);
00063 }
00064