STM32F407 DAC检测电池电压代码
时间: 2023-09-10 07:06:40 浏览: 40
下面是基于STM32F407芯片的DAC检测电池电压的代码示例:
```c
#include "stm32f4xx.h"
// 定义DAC输出引脚对应的GPIO端口和引脚号
#define DAC_GPIO_PORT GPIOA
#define DAC_GPIO_PIN GPIO_Pin_4
// 定义ADC输入引脚对应的GPIO端口和引脚号
#define ADC_GPIO_PORT GPIOA
#define ADC_GPIO_PIN GPIO_Pin_0
// 定义ADC采样周期
#define ADC_SAMPLE_CYCLES 480
// 定义DAC输出值与电压之间的转换系数
#define DAC_VREF 3.3f // DAC参考电压为3.3V
#define DAC_RESOLUTION 4096 // DAC分辨率为12位
#define VBAT_DIV_RATIO 2.0f // 电池电压分压比为2:1
#define DAC_OUTPUT_SCALE (DAC_VREF / DAC_RESOLUTION * VBAT_DIV_RATIO)
// 初始化DAC
void DAC_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
DAC_InitTypeDef DAC_InitStructure;
// 使能DAC和GPIO时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// 配置DAC输出引脚对应的GPIO
GPIO_InitStructure.GPIO_Pin = DAC_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; // 模拟输入模式
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(DAC_GPIO_PORT, &GPIO_InitStructure);
// DAC初始化
DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
DAC_Init(DAC_Channel_1, &DAC_InitStructure);
// 使能DAC通道1
DAC_Cmd(DAC_Channel_1, ENABLE);
}
// 初始化ADC
void ADC_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
// 使能ADC和GPIO时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// 配置ADC输入引脚对应的GPIO
GPIO_InitStructure.GPIO_Pin = ADC_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; // 模拟输入模式
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(ADC_GPIO_PORT, &GPIO_InitStructure);
// ADC公共配置
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
// ADC配置
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
// 配置ADC采样周期
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SAMPLE_CYCLES);
// 使能ADC
ADC_Cmd(ADC1, ENABLE);
}
// 获取电池电压
float GetBatteryVoltage(void)
{
uint16_t adc_value;
float voltage;
// 启动ADC采样
ADC_SoftwareStartConv(ADC1);
// 等待ADC采样完成
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
// 读取ADC采样结果
adc_value = ADC_GetConversionValue(ADC1);
// 计算电池电压
voltage = (float)adc_value / DAC_RESOLUTION * DAC_VREF / VBAT_DIV_RATIO;
return voltage;
}
int main(void)
{
float battery_voltage;
// 初始化DAC和ADC
DAC_Init();
ADC_Init();
while(1)
{
// 获取电池电压
battery_voltage = GetBatteryVoltage();
// 将电池电压转换为DAC输出值并输出到DAC引脚
DAC_SetChannel1Data(DAC_Align_12b_R, (uint16_t)(battery_voltage / DAC_OUTPUT_SCALE));
// 延时一段时间
// ...
}
}
```
以上代码中,使用DAC将电池电压的模拟值输出到DAC引脚,然后ADC读取DAC引脚的模拟值进行采样。通过计算ADC采样结果和DAC输出值之间的转换系数,可以将采样结果转换为电池电压。