本帖最后由 点点舒 于 2017-4-13 17:39 编辑
我使用STM32F4的DMA +DAC输出一个正弦波，在示波器上面查看有1.14KHZ，3.26V的峰峰值。
但是接在我的AD采集板上却采集不到，请教大神们！
AD采集板确实可以采集到数据。
u16 sinTable[tableSize];
void sin_Generation(void)
{
u16 n;
for(n=0;n<tableSize;n++)
{
sinTable[n] = (sin(2*PI*n/tableSize)+1)*2047;
}
}
void TIM6_Configuration(void)
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE);
TIM_PrescalerConfig(TIM6, 0x0, TIM_PSCReloadMode_Update);
TIM_SetAutoreload(TIM6, 0x1);
TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);
TIM_Cmd(TIM6, ENABLE);
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); //使能P口
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; //PA4 DAC通道1输出
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; //先配置为模拟输入
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void DAC_DMA_Configuration(void)
{
DAC_InitTypeDef DAC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
DAC_InitStructure.DAC_Trigger = DAC_Trigger_T6_TRGO; //使用定时器6
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None; //不产生波形
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
DAC_Init(DAC_Channel_1, &DAC_InitStructure);
DMA_DeInit(DMA1_Stream5);
DMA_InitStructure.DMA_Channel = DMA_Channel_7;
DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R1_ADDRESS;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&sinTable;
DMA_InitStructure.DMA_BufferSize = tableSize;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_HalfWord;
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_Stream5, &DMA_InitStructure);
DMA_Cmd(DMA1_Stream5, ENABLE);
DAC_Cmd(DAC_Channel_1, ENABLE);
DAC_DMACmd(DAC_Channel_1, ENABLE);
}
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