3.2 产生三角波
在上述代码基础上加入下面代码，其中部分代码替代
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 0xF;
TIM_TimeBaseStructure.TIM_Prescaler = 0xF;
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_Triangle;
DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_TriangleAmplitude_2047;
3.3 利用DMA产生正弦波(DAC2)和直流电压值（DAC1）
uint16_t g_Wave[128];
uint16_t DAC1_Value[1];
const uint16_t SineData[32] = {
2047, 2447, 2831, 3185, 3498, 3750, 3939, 4056, 4095, 4056,
3939, 3750, 3495, 3185, 2831, 2447, 2047, 1647, 1263, 909,
599, 344, 155, 38, 0, 38, 155, 344, 599, 909, 1263, 1647};
void RCC_DAC_Config(void)
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
}
void GPIO_DAC_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_4|GPIO_Pin_5;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA,&GPIO_InitStructure);
}
void DAC_Config(void)
{
uint32_t i=0;
DMA_InitTypeDef DMA_InitStructure;
DAC_InitTypeDef DAC_InitStructure;
DAC1_Value[0]=4096*0.612;
for(i=0;i<32;i++)
{
//g_Wave=DAC2_SineWave *0.606; //Vpp =2.0V
g_Wave=SineData *0.606; //Vpp =2.0V
}
RCC_DAC_Config();
GPIO_DAC_Config();
TIM_PrescalerConfig(TIM2,0,TIM_PSCReloadMode_Update);
TIM_SetAutoreload(TIM2, 22);
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
#if 0
DAC_Init(DAC_Channel_1, &DAC_InitStructure);
DMA_DeInit(DMA2_Channel3);
DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R1_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&DAC1_Value;
DMA_InitStructure.DMA_BufferSize = 1;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
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_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA2_Channel3, &DMA_InitStructure);
DMA_Cmd(DMA2_Channel3, ENABLE);
DAC_Cmd(DAC_Channel_1, ENABLE);
DAC_DMACmd(DAC_Channel_1, ENABLE);
TIM_Cmd(TIM2, ENABLE);
#else
DAC_Init(DAC_Channel_2, &DAC_InitStructure);
DMA_DeInit(DMA2_Channel4);
DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R2_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&g_Wave;
DMA_InitStructure.DMA_BufferSize = 32;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
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_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA2_Channel4,&DMA_InitStructure);
DMA_Cmd(DMA2_Channel4,ENABLE);
DAC_Cmd(DAC_Channel_2,ENABLE);
DAC_DMACmd(DAC_Channel_2,ENABLE);
TIM_Cmd(TIM2,ENABLE);
#endif
}
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第三代功率半导体器件测试解决方案 直播时间： 03月06日 10:00
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