想請教有關於DA的問題
想要請問各位先進，如果我想要測試模組Reverse Park內的演算是否有錯誤，我用DA來將演算出來的數據接上示波器觀看，但是我發現我Reverse Park計算後的值和DA讀出來的數據有所不同，所以想要請問是哪裡出錯呢?我DA是為PA4, PA5兩隻Pin腳。程式中Theta從0~360度，Stat_Volt_q_d固定都給3.3V 。對於輸入電壓值，想要請問是直接給3.3還是我必須要做轉換呢?謝謝主程式如下Stat_Volt_q_d.qV_Component1 =3.3;
Stat_Volt_q_d.qV_Component2 = 3.3;
Stat_Volt_alfa_beta = ipark_calc(Stat_Volt_q_d, Theta);
Stat_Volt_alfa_beta.qV_Component1 = Stat_Volt_alfa_beta.qV_Component1 / 32766;
Stat_Volt_alfa_beta.qV_Component2 = Stat_Volt_alfa_beta.qV_Component2 / 32766;
DAC_SetChannel1Data(DAC_Align_12b_R, Stat_Volt_alfa_beta.qV_Component1);
DacX = DAC_GetDataOutputValue(DAC_Channel_1);
DacTemp = (float) DacX * (3.3/4096);
DAC_SetChannel2Data(DAC_Align_12b_R, Stat_Volt_alfa_beta.qV_Component2);
DacX = DAC_GetDataOutputValue(DAC_Channel_2);
DacTemp = (float) DacX * (3.3/409);
副程式
static void DAC_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
static void DAC_TIM_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 100;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
TIM_Cmd(TIM2, ENABLE);
}
static void DAC_Init(void)
{
DAC_InitTypeDef DAC_InitStructure;
DMA_InitTypeDef DMA_INIT;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_TriangleAmplitude_4095;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
DAC_Init(DAC_Channel_1, &DAC_InitStructure);
DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_TriangleAmplitude_4095;
DAC_Init(DAC_Channel_2, &DAC_InitStructure);
DAC_Cmd(DAC_Channel_1, ENABLE);
DAC_Cmd(DAC_Channel_2, ENABLE);
DAC_SetDualChannelData(DAC_Align_12b_R, 0x00, 0x00);
}
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