Diff: spidma.cpp

Revision:

0:8f8765c8b7bd

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spidma.cpp	Sun Nov 13 17:59:38 2016 +0000
@@ -0,0 +1,107 @@
+/*===================================================================*/
+/*                                                                   */
+/*  spidma.cpp : SPI DMA function                                    */
+/*                                                                   */
+/*  2016/1/20  Racoon                                                */
+/*                                                                   */
+/*===================================================================*/
+
+#include "mbed.h"
+#include "stm32f4xx_hal.h"
+
+SPI_HandleTypeDef SpiHandle;
+
+/*-------------------------------------------------------------------*/
+/*  callback                                                         */
+/*-------------------------------------------------------------------*/
+extern "C" {
+    void HAL_SPI_MspInit(SPI_HandleTypeDef *hspi)
+    {
+        static DMA_HandleTypeDef hdma_tx;
+
+        GPIO_InitTypeDef GPIO_InitStruct;
+
+        __HAL_RCC_GPIOA_CLK_ENABLE();
+        __HAL_RCC_SPI1_CLK_ENABLE();
+        __HAL_RCC_DMA2_CLK_ENABLE();
+
+        GPIO_InitStruct.Pin       = GPIO_PIN_5;
+        GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
+        GPIO_InitStruct.Pull      = GPIO_PULLUP;
+        GPIO_InitStruct.Speed     = GPIO_SPEED_HIGH;
+        GPIO_InitStruct.Alternate = GPIO_AF5_SPI1;
+        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
+        GPIO_InitStruct.Pin = GPIO_PIN_6;
+        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
+        GPIO_InitStruct.Pin = GPIO_PIN_7;
+        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
+        hdma_tx.Instance                 = DMA2_Stream3;
+        hdma_tx.Init.Channel             = DMA_CHANNEL_3;
+        hdma_tx.Init.Direction           = DMA_MEMORY_TO_PERIPH;
+        hdma_tx.Init.PeriphInc           = DMA_PINC_DISABLE;
+        hdma_tx.Init.MemInc              = DMA_MINC_ENABLE;
+        hdma_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
+        hdma_tx.Init.MemDataAlignment    = DMA_MDATAALIGN_BYTE;
+        hdma_tx.Init.Mode                = DMA_NORMAL;
+        hdma_tx.Init.Priority            = DMA_PRIORITY_HIGH;
+        hdma_tx.Init.FIFOMode            = DMA_FIFOMODE_DISABLE;
+        hdma_tx.Init.FIFOThreshold       = DMA_FIFO_THRESHOLD_FULL;
+        hdma_tx.Init.MemBurst            = DMA_MBURST_SINGLE;
+        hdma_tx.Init.PeriphBurst         = DMA_PBURST_SINGLE;
+
+        HAL_DMA_Init(&hdma_tx);
+
+        __HAL_LINKDMA(hspi, hdmatx, hdma_tx);
+
+        HAL_NVIC_SetPriority(DMA2_Stream3_IRQn, 0, 1);
+        HAL_NVIC_EnableIRQ(DMA2_Stream3_IRQn);
+    }
+
+    void DMA2_Stream3_IRQHandler(void)
+    {
+        HAL_DMA_IRQHandler(SpiHandle.hdmatx);
+    }
+
+} // extern "C"
+
+/*-------------------------------------------------------------------*/
+/*  Write a byte data                                                */
+/*-------------------------------------------------------------------*/
+void spi_write(uint8_t data)
+{
+    HAL_SPI_Transmit(&SpiHandle, &data, 1, 100);
+}
+
+/*-------------------------------------------------------------------*/
+/*  Write a word data                                                */
+/*-------------------------------------------------------------------*/
+void spi_writew(uint16_t data)
+{
+    HAL_SPI_Transmit(&SpiHandle, (uint8_t *)&data, 2, 100);
+}
+
+/*-------------------------------------------------------------------*/
+/*  Initialize SPI DMA                                               */
+/*-------------------------------------------------------------------*/
+void spi_init()
+{
+    SpiHandle.Instance               = SPI1;
+    SpiHandle.Init.Mode              = SPI_MODE_MASTER;
+    SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
+    SpiHandle.Init.Direction         = SPI_DIRECTION_2LINES;
+    SpiHandle.Init.CLKPhase          = SPI_PHASE_1EDGE;
+    SpiHandle.Init.CLKPolarity       = SPI_POLARITY_HIGH;
+    SpiHandle.Init.CRCCalculation    = SPI_CRCCALCULATION_DISABLE;
+    SpiHandle.Init.CRCPolynomial     = 7;
+    SpiHandle.Init.DataSize          = SPI_DATASIZE_8BIT;
+    SpiHandle.Init.FirstBit          = SPI_FIRSTBIT_MSB;
+    SpiHandle.Init.NSS               = SPI_NSS_SOFT;
+    SpiHandle.Init.TIMode            = SPI_TIMODE_DISABLE;
+
+    if (HAL_SPI_Init(&SpiHandle) != HAL_OK)
+        while(1);
+}
+