stm32cubemx使用DAC+DMA输出1khz正弦波
时间: 2023-10-11 10:12:29 浏览: 263
1. 打开STM32CubeMX软件,选择你的芯片型号和对应的工程路径。
2. 点击“Pinout & Configuration”选项卡,选择DAC输出通道对应的引脚,并将其配置为“Analog”模式。
3. 点击“Clock Configuration”选项卡,配置芯片时钟。在“High Speed Clock(HSE)”中,选择外部晶振或者外部时钟源,然后设置时钟频率。
4. 点击“DAC Configuration”选项卡,使能DAC1或者DAC2,并配置输出模式为“DMA波形模式”。
5. 点击“DMA Configuration”选项卡,配置DMA通道。选择与DAC输出通道对应的DMA通道,并设置传输模式为“循环模式”。
6. 点击“DAC波形模式”选项卡,选择“正弦波模式”,然后设置波形频率为1kHz。
7. 点击“Generate Code”按钮,生成代码。
8. 在生成的代码中,找到“HAL_DAC_Start_DMA()”函数,并在主函数中调用该函数。这个函数将启动DMA传输,并在DAC输出通道上输出正弦波。
9. 编译并下载代码到芯片中,然后连接示波器或者听筒检查输出的正弦波。
注意事项:
1. DAC输出通道和DMA通道必须对应,否则无法输出正弦波。
2. 正弦波的频率和幅度可以根据需要进行配置。
3. 在代码中需要包含“stm32f4xx_hal.h”和“stm32f4xx_hal_dac.h”头文件。
相关问题
Linux STM32MP157 DMA+DAC 输出正弦波例程
以下是使用Linux STM32MP157板子的DMA+DAC输出正弦波的示例代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <linux/dma-buf.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/dma-fence.h>
#include <linux/types.h>
#include <linux/ioctl.h>
#define DAC_BASE_ADDRESS 0x40007400
#define DAC_DHR12R1 0x08
#define DAC_DHR12L1 0x0C
#define DAC_CR 0x00
#define PI 3.14159265
#define SAMPLE_RATE 48000
#define AMPLITUDE 2047
#define FREQUENCY 1000
int main()
{
int fd_mem = open("/dev/mem", O_RDWR | O_SYNC);
if (fd_mem < 0) {
printf("Failed to open /dev/mem\n");
return -1;
}
void* mem = mmap(0, 0x1000, PROT_READ | PROT_WRITE, MAP_SHARED, fd_mem, DAC_BASE_ADDRESS);
if (mem == MAP_FAILED) {
printf("Failed to mmap memory\n");
return -1;
}
uint32_t* dac = (uint32_t*)mem;
// Enable DAC and DMA
dac[DAC_CR / 4] |= (1 << 0) | (1 << 12);
// Configure DMA
int fd_dma = open("/dev/dma-buf/0", O_RDWR | O_SYNC);
if (fd_dma < 0) {
printf("Failed to open /dev/dma-buf/0\n");
return -1;
}
uint32_t* buf = mmap(0, SAMPLE_RATE * sizeof(uint16_t), PROT_READ | PROT_WRITE, MAP_SHARED, fd_dma, 0);
if (buf == MAP_FAILED) {
printf("Failed to mmap DMA buffer\n");
return -1;
}
uint16_t* samples = (uint16_t*)buf;
for (int i = 0; i < SAMPLE_RATE; i++) {
double t = (double)i / (double)SAMPLE_RATE;
samples[i] = (uint16_t)((double)AMPLITUDE * sin(2 * PI * FREQUENCY * t) + (double)AMPLITUDE);
}
struct dmaengine_cmd cmd = {
.flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK,
.wait_for_completion_timeout = 1000,
.size = SAMPLE_RATE * sizeof(uint16_t),
.direction = DMA_MEM_TO_DEV,
.src_start = buf,
.dst_start = &dac[DAC_DHR12R1 / 4],
};
int ret = ioctl(fd_dma, DMA_BUF_IOCTL_CMD, &cmd);
if (ret < 0) {
printf("Failed to configure DMA\n");
return -1;
}
printf("Press enter to stop the program\n");
getchar();
// Disable DAC and DMA
dac[DAC_CR / 4] &= ~((1 << 0) | (1 << 12));
// Unmap memory
munmap(buf, SAMPLE_RATE * sizeof(uint16_t));
munmap(mem, 0x1000);
close(fd_dma);
close(fd_mem);
return 0;
}
```
这段代码会生成一个1kHz的正弦波,并使用DMA将数据传输到DAC输出。你可以根据需要修改参数,比如采样率、幅值、频率等。同时,请注意实际硬件的数据手册和引脚定义,确保代码正确配置DAC输出。
请写出STM32F103ZET6的12位DAC来生成并输出1KHz的正弦波的代码,为了降低MCU使用率,不要使用中断,最好采用DMA。
以下是生成并输出1KHz正弦波的代码,使用STM32F103ZET6的12位DAC,采用DMA方式:
#include "stm32f10x.h"
#define DAC_DHR12R1_Address x40007408
const uint16_t Sine12bit[32] = {
2048, 2447, 2831, 3185, 3498, 3768, 3989, 4157,
4269, 4321, 4311, 4239, 4107, 3919, 368, 3396,
3072, 2714, 2333, 1936, 153, 1124, 724, 337,
69, 7, 161, 530, 1101, 1771, 2535, 3375
};
void DAC_DMA_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;
DAC_InitTypeDef DAC_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
DMA_DeInit(DMA1_Channel3);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)DAC_DHR12R1_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&Sine12bit;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = 32;
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(DMA1_Channel3, &DMA_InitStructure);
DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
DAC_Init(DAC_Channel_1, &DAC_InitStructure);
DAC_Cmd(DAC_Channel_1, ENABLE);
DMA_Cmd(DMA1_Channel3, ENABLE);
DAC_DMACmd(DAC_Channel_1, ENABLE);
}
int main(void)
{
DAC_DMA_Configuration();
while (1) {
// do something else
}
}
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