今天把stm32的dma配置成 DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToMemory;
结果从lcd上读回来的数据是乱的！！调了好久都不知道是什么原因~
有哪位高手调过类似的程序，就来指点指点我吧！！
还有的一个问题：MemoryToMemory是双向模式，那怎么确定数据的走向呢？
附stm32f4_dma的配置函数：
//STM32F4XX_DMA传输配置
static void dmaRead(u16* dst ,u16 size)
{
DMA_InitTypeDef DMA_InitStructure;
DMA_Cmd(DMA2_Stream0, DISABLE);
//RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
DMA_DeInit(DMA2_Stream0);
while (DMA_GetCmdStatus(DMA2_Stream0) != DISABLE);\
//配置DMA流
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(0X60000000); //
DMA_InitStructure.DMA_Memory0BaseAddr = (u32)dst;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToMemory;
DMA_InitStructure.DMA_BufferSize = size; /* assert_param(0~64K) */
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;//正常模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Enable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream0, &DMA_InitStructure);
DMA_Cmd(DMA2_Stream0, ENABLE);
while ((DMA_GetCmdStatus(DMA2_Stream0) != ENABLE));
} |
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