rt-thread-official/bsp/efm32/drv_dma.c

/***************************************************************************//**
 * @file    drv_dma.c
 * @brief   DMA driver of RT-Thread RTOS for EFM32
 *  COPYRIGHT (C) 2012, RT-Thread Development Team
 * @author  onelife
 * @version 1.0
 *******************************************************************************
 * @section License
 * The license and distribution terms for this file may be found in the file
 * LICENSE in this distribution or at http://www.rt-thread.org/license/LICENSE
 *******************************************************************************
 * @section Change Logs
 * Date         Author      Notes
 * 2010-12-23   onelife     Initial creation for EFM32
 ******************************************************************************/

/***************************************************************************//**
 * @addtogroup efm32
 * @{
 ******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "board.h"
#include "drv_dma.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/** DMA control block, requires proper alignment. */
#if defined (__ICCARM__)
#pragma data_alignment=256
DMA_DESCRIPTOR_TypeDef dmaControlBlock[DMA_CHAN_COUNT * 2];
#elif defined (__CC_ARM)
DMA_DESCRIPTOR_TypeDef dmaControlBlock[DMA_CHAN_COUNT * 2] __attribute__ ((aligned(256)));
#elif defined (__GNUC__)
DMA_DESCRIPTOR_TypeDef dmaControlBlock[DMA_CHAN_COUNT * 2] __attribute__ ((aligned(256)));
#else
#error Undefined toolkit, need to define alignment
#endif

/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/***************************************************************************//**
 * @brief
 *    Initialize DMA hardware
 *
 * @details
 *
 * @note
 ******************************************************************************/
void rt_hw_dma_init(void)
{
    DMA_Init_TypeDef        dmaInit;

    /* Reset */
    DMA_Reset();

    dmaInit.hprot           = 0;
    dmaInit.controlBlock    = (DMA_DESCRIPTOR_TypeDef *)&dmaControlBlock;
    DMA_Init(&dmaInit);
    NVIC_SetPriority(DMA_IRQn, EFM32_IRQ_PRI_DEFAULT);
}

/***************************************************************************//**
 * @}
 ******************************************************************************/