stm32dac输出两路正弦波
时间: 2023-08-03 18:07:36 浏览: 166
好的,您可以按照以下步骤进行操作:
1. 配置DAC模块:将DAC模块的时钟打开,并设置DAC输出通道的精度和触发源等参数。
2. 配置GPIO:选择DAC输出通道的GPIO引脚,并将其设置为模拟输出模式。
3. 生成正弦波数据:可以使用数学库函数生成正弦波数据,也可以使用查表法预先生成正弦波数据表。
4. 启动DAC输出:使用DMA或定时器的触发方式,向DAC数据寄存器中填充正弦波数据,使DAC开始输出正弦波。
以下是一份简单的代码示例:
```c
#include "stm32f4xx.h"
#include <math.h>
#define PI 3.1415926f
#define SAMPLE_RATE 10000 // 采样率
#define FREQ_A 500 // 正弦波A频率
#define FREQ_B 1000 // 正弦波B频率
uint16_t waveTableA[SAMPLE_RATE / FREQ_A];
uint16_t waveTableB[SAMPLE_RATE / FREQ_B];
uint16_t waveIndexA = 0;
uint16_t waveIndexB = 0;
void DAC_Config(void)
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStruct);
DAC_InitTypeDef DAC_InitStruct;
DAC_InitStruct.DAC_Trigger = DAC_Trigger_T2_TRGO;
DAC_InitStruct.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
DAC_Init(DAC_Channel_1, &DAC_InitStruct);
DAC_Init(DAC_Channel_2, &DAC_InitStruct);
DAC_Cmd(DAC_Channel_1, ENABLE);
DAC_Cmd(DAC_Channel_2, ENABLE);
}
void TIM_Config(void)
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseInitTypeDef TIM_InitStruct;
TIM_InitStruct.TIM_Period = SAMPLE_RATE / FREQ_A - 1;
TIM_InitStruct.TIM_Prescaler = SystemCoreClock / SAMPLE_RATE - 1;
TIM_InitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_InitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_InitStruct);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM2, ENABLE);
}
void DMA_Config(void)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
DMA_InitTypeDef DMA_InitStruct;
DMA_InitStruct.DMA_Channel = DMA_Channel_7;
DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t) &DAC->DHR12R1;
DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t) waveTableA;
DMA_InitStruct.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStruct.DMA_BufferSize = sizeof(waveTableA) / sizeof(uint16_t);
DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;
DMA_InitStruct.DMA_Priority = DMA_Priority_High;
DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA1_Stream5, &DMA_InitStruct);
DMA_InitStruct.DMA_Channel = DMA_Channel_4;
DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t) waveTableB;
DMA_Init(DMA1_Stream6, &DMA_InitStruct);
DMA_Cmd(DMA1_Stream5, ENABLE);
DMA_Cmd(DMA1_Stream6, ENABLE);
}
void TIM2_IRQHandler(void)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
waveTableA[waveIndexA++] = (uint16_t)(2048 * sinf(2 * PI * FREQ_A * waveIndexA / SAMPLE_RATE) + 2048);
waveTableB[waveIndexB++] = (uint16_t)(2048 * sinf(2 * PI * FREQ_B * waveIndexB / SAMPLE_RATE) + 2048);
}
int main(void)
{
DAC_Config();
TIM_Config();
DMA_Config();
while (1)
{
}
}
```
这段代码使用定时器2触发中断的方式生成正弦波数据,并使用DMA将数据传输到DAC数据寄存器中,实现两路正弦波的输出。其中,使用了STM32F4内置的数学库函数sinf()来生成正弦波数据,而不是使用查表法预先生成正弦波数据表。
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