求教N32G45X單片機DAC+TIM+DAM生成正弦波頻率不準

ID:1066092 · 發表于 2023-3-11 13:32

參考網上ST的例子，在注釋掉TIM_TrgoInit里的TIM2或者TIM4，只使用DAC1在PA4上能得到正確的56.25K或者只使用DAC2在PA5上也能得到正確的102.27K正弦波出來，但是只要將同時使用TIM2和TIM4讓DAC1和DAC2同時輸出正弦波，那么PA4還是正確的56.25K波，而PA5就只有80K多點跳動范圍大，而且也不是正確的102.27K，求問幫忙指點指點下面是哪里不正確搞成這樣的錯誤結果？
另外還有個問題是輸出電壓峰峰值不是3.3V，官方例子出來的電壓是約1.6V，輸出頻率不一樣電壓峰峰值也會不一樣，我這頻率大概是2.7V，這又是為什么？按說打點是0～4095那么輸出電壓基本應該就是基準上的0～3.3V這樣，實際上怎么差那么遠還隨頻率的變化電壓還不同，奇了怪了。

單片機源程序如下:

#include "n32g45x.h"
/** @addtogroup DAC_DualModeDMA_SineWave
* @{
*/
//#define DAC_DHR12RD_Address 0x40007420
#define DAC_DR12CH1_Address 0x40007408
#define DAC_DR12CH2_Address 0x40007414
/* Init Structure definition */
DAC_InitType DAC_InitStructure;
uint32_t Idx = 0;
const uint16_t Sine12bit[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};
uint32_t DualSine12bit[32];
void RCC_Configuration(void);
void GPIO_Configuration(void);
void TIM_TrgoInit(void);
void DAC_SineWaveInit(void);
void DMA_Config(void);
/**
* @brief Main program.
*/
int main(void)
{
GPIO_Configuration();
TIM_TrgoInit();
DAC_SineWaveInit();
/* Fill Sine32bit table */
// for (Idx = 0; Idx < 32; Idx++)
// {
// DualSine12bit[Idx] = (Sine12bit[Idx] << 16) + (Sine12bit[Idx]);
// }
/* DMA Config */
DMA_Config();
TIM_Enable(TIM2, ENABLE);
TIM_Enable(TIM4, ENABLE);
while (1)
{
}
}
/**
* @brief Configures the different system clocks.
*/
void RCC_Configuration(void)
{
/* DAC Periph clock enable */
RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_DAC, ENABLE);
}
/**
* @brief Configures the different GPIO ports.
*/
void GPIO_Configuration(void)
{
GPIO_InitType GPIO_InitStructure;
/* GPIOA Periph clock enable */
RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_GPIOA, ENABLE);
GPIO_InitStructure.Pin = GPIO_PIN_4 | GPIO_PIN_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_InitPeripheral(GPIOA, &GPIO_InitStructure);
}
/**
* @brief TIM4 Init.
*/
void TIM_TrgoInit(void)
{
TIM_TimeBaseInitType TIM_TimeBaseStructure;
/* TIM4 Periph clock enable */
RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_TIM2 , ENABLE); // RCC_APB2_PERIPH_TIM8
RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_TIM4 , ENABLE);
TIM_InitTimBaseStruct(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.Period =39;
TIM_TimeBaseStructure.Prescaler = 0x0;
TIM_TimeBaseStructure.ClkDiv = 0x0;
TIM_TimeBaseStructure.CntMode = TIM_CNT_MODE_UP;
TIM_InitTimeBase(TIM2, &TIM_TimeBaseStructure);
TIM_TimeBaseStructure.Period =21;
TIM_TimeBaseStructure.Prescaler = 0x0;
TIM_TimeBaseStructure.ClkDiv = 0x0;
TIM_TimeBaseStructure.CntMode = TIM_CNT_MODE_UP;
TIM_InitTimeBase(TIM4, &TIM_TimeBaseStructure);
TIM_SelectOutputTrig(TIM2, TIM_TRGO_SRC_UPDATE);
TIM_SelectOutputTrig(TIM4, TIM_TRGO_SRC_UPDATE);
}
/**
* @brief DAC SineWave Config.
*/
void DAC_SineWaveInit(void)
{
/* DAC Periph clock enable */
RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_DAC, ENABLE);
DAC_InitStructure.Trigger = DAC_TRG_T2_TRGO;
DAC_InitStructure.WaveGen = DAC_WAVEGEN_NONE;
DAC_InitStructure.BufferOutput = DAC_BUFFOUTPUT_DISABLE;
DAC_Init(DAC_CHANNEL_1, &DAC_InitStructure);
DAC_InitStructure.Trigger = DAC_TRG_T4_TRGO;
DAC_InitStructure.WaveGen = DAC_WAVEGEN_NONE;
DAC_InitStructure.BufferOutput = DAC_BUFFOUTPUT_DISABLE;
DAC_Init(DAC_CHANNEL_2, &DAC_InitStructure);
DAC_Enable(DAC_CHANNEL_1, ENABLE);
DAC_Enable(DAC_CHANNEL_2, ENABLE);
DAC_DmaEnable(DAC_CHANNEL_1, ENABLE);
DAC_DmaEnable(DAC_CHANNEL_2, ENABLE);
}
/**
* @brief DMA Config.
*/
void DMA_Config(void)
{
DMA_InitType DMA_InitStructure;
/* DMA2 clock enable */
RCC_EnableAHBPeriphClk(RCC_AHB_PERIPH_DMA2, ENABLE);
// DMA_DeInit(DMA2_CH3);
DMA_InitStructure.PeriphAddr = DAC_DR12CH1_Address;
DMA_InitStructure.MemAddr = (uint32_t)&Sine12bit;
DMA_InitStructure.Direction = DMA_DIR_PERIPH_DST;
DMA_InitStructure.BufSize = 32;
DMA_InitStructure.PeriphInc = DMA_PERIPH_INC_DISABLE;
DMA_InitStructure.DMA_MemoryInc = DMA_MEM_INC_ENABLE;
DMA_InitStructure.PeriphDataSize = DMA_PERIPH_DATA_SIZE_HALFWORD;
DMA_InitStructure.MemDataSize = DMA_MemoryDataSize_HalfWord ;
DMA_InitStructure.CircularMode = DMA_MODE_CIRCULAR;
DMA_InitStructure.Priority = DMA_PRIORITY_HIGH;
DMA_InitStructure.Mem2Mem = DMA_M2M_DISABLE;
DMA_Init(DMA2_CH3, &DMA_InitStructure);
DMA_EnableChannel(DMA2_CH3, ENABLE);
// DMA_DeInit(DMA2_CH4);
DMA_InitStructure.PeriphAddr =DAC_DR12CH2_Address;
DMA_InitStructure.MemAddr = (uint32_t)&Sine12bit;
DMA_InitStructure.Direction = DMA_DIR_PERIPH_DST;
DMA_InitStructure.BufSize = 32;
DMA_InitStructure.PeriphInc = DMA_PERIPH_INC_DISABLE;
DMA_InitStructure.DMA_MemoryInc = DMA_MEM_INC_ENABLE;
DMA_InitStructure.PeriphDataSize = DMA_PERIPH_DATA_SIZE_HALFWORD;
DMA_InitStructure.MemDataSize = DMA_MemoryDataSize_HalfWord ;
DMA_InitStructure.CircularMode = DMA_MODE_CIRCULAR;
DMA_InitStructure.Priority = DMA_PRIORITY_HIGH;
DMA_InitStructure.Mem2Mem = DMA_M2M_DISABLE;
DMA_Init(DMA2_CH4, &DMA_InitStructure);
DMA_EnableChannel(DMA2_CH4, ENABLE);
}

復制代碼

ID:1066092 · 發表于 2023-3-13 22:46

自己來頂下，卡這里幾天了不知道問題在哪里，參考論壇“STM32F103單片機輸出兩路不同頻率的正弦波源程序”對比了下似乎我上面的配置應該是能生成正確頻率的正弦波，但是用兩個定時器有一個生成的頻率就是和實際計算的不同，壇里的兄弟能幫忙看看我這個配置是哪里有問題還是這個芯片配置有特殊地方？先多謝了！

ID:301191 · 發表于 2023-3-14 00:11

頂一下

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求教N32G45X單片機DAC+TIM+DAM生成正弦波頻率不準