TIM4 TIM8 DMA 修改CCR问题

hhet · 发表于 2013-6-24 08:36:06

大家好，最近做个逆变器的项目，想利用DMA直接修改TIM4/8的CCR 寄存器数据，从而实现最少资源开销的定时器控制，

程序定时器DMA配置如下：

// //------ TIM4_UP---DMA1--Channel_2--Stream6 configuration --------------

// DMA_DeInit(DMA1_Stream6);

// DMA_InitStructure.DMA_Channel = DMA_Channel_2;

// DMA_InitStructure.DMA_PeripheralBaseAddr = TIM4_CCR1_ADDRESS;

// DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)TIM4_DMA_PS;

// DMA_InitStructure.DMA_BufferSize = 1;

// DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//DMA_PeripheralDataSize_Byte;

// DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;

// DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;

// DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//Enable;

// DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;//Enable;

// DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;

// DMA_InitStructure.DMA_Priority = DMA_Priority_High;

// DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;

// DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;

// DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;

// DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

// DMA_Init(DMA1_Stream6, &DMA_InitStructure);

// /* Enable DMA1_Stream6 */

// DMA_Cmd(DMA1_Stream6, ENABLE);

// //-------------------------------------

// TIM_DMAConfig(TIM4, TIM_DMABase_CCR1, TIM_DMABurstLength_1Transfer);//Set dma basee and num

// TIM_DMACmd(TIM4,TIM_DMA_Update,ENABLE);//TIM4_UP DMA enable

仿真看,MDA没有把“ (uint32_t)TIM4_DMA_PS”的数据搬移到CCR1中，CCR1中总是0，这是为何呢？

那我最过DMA的TIM控制呢？希望能指教下！非常感谢
我的QQ:349166370

正点原子 · 发表于 2013-6-24 10:29:57

你得用MEM2MEM模式吧?

hhet · 发表于 2013-6-24 11:13:10

回复【2楼】正点原子:

你得用MEM2MEM模式吧?
用MEM2MEM模式是什么模式？
我的DMA配置为：DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
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回复【2楼】正点原子:

你得用MEM2MEM模式吧?

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