taonsh 发表于 2016-10-30 11:58:37

关于stm32f407固件库的DAC与DMA例子太不严谨了！！！

   STM32F4-Discovery_FW_V1.1.0固件库中的Peripheral_Examples例子中中的“DAC_SignalsGeneration”工程，举例
/**
* @briefDAC Channel1 Escalator Configuration
* @paramNone
* @retval None
*/
void DAC_Ch1_EscalatorConfig(void)
{
DMA_InitTypeDef DMA_InitStructure;

/* DAC channel1 Configuration */
DAC_InitStructure.DAC_Trigger = DAC_Trigger_T6_TRGO;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
DAC_Init(DAC_Channel_1, &DAC_InitStructure);

/* DMA1_Stream6 channel7 configuration **************************************/
DMA_DeInit(DMA1_Stream6);
DMA_InitStructure.DMA_Channel = DMA_Channel_7;
DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR8R1_ADDRESS;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&Escalator8bit;
DMA_InitStructure.DMA_BufferSize = 6;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_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);

/* Enable DAC Channel1 */
DAC_Cmd(DAC_Channel_1, ENABLE);

/* Enable DMA for DAC Channel1 */
DAC_DMACmd(DAC_Channel_1, ENABLE);
}
       其中DAC_Channel_1跟DMA1_Stream6的DMA_Channel_7对，明显不对。。
不知道是出于什么原因。
       而函数void DAC_Ch2_SineWaveConfig(void)却是DAC_Channel_2跟DMA1_Stream5的DMA_Channel_7对。。。。有解释吗？？

taonsh 发表于 2016-10-30 12:12:45

自己顶！！:D:lol:victory:

asssdz-382474 发表于 2016-10-30 12:46:57

:):):):):):):):)

stary666 发表于 2016-10-30 12:48:13

本来就不爱库

taonsh 发表于 2016-10-30 13:09:49

asssdz-382474 发表于 2016-10-30 12:46


我亲自测试过该工程，只开DAC1或是只开DAC2时，是没有输出的！！

taonsh 发表于 2016-10-30 13:10:47

stary666 发表于 2016-10-30 12:48
本来就不爱库

有很多地方不严够谨！

kylongmu 发表于 2016-10-30 21:55:18

CUBE 的DAC与ADC配置DMA是问题最多的

高二毛 发表于 2016-10-31 08:33:45

关注。。。。。

stary666 发表于 2016-10-31 09:20:47

呵呵哈哈哈或
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