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

/******************************************************************//**
 * @file 		drv_dma.c
 * @brief 	USART driver of RT-Thread RTOS for EFM32
 * 	COPYRIGHT (C) 2011, RT-Thread Development Team
 * @author 	onelife
 * @version 	0.4 beta
 **********************************************************************
 * @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);
}

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