嵌入式实现双路adc通道转换
本程序对应的开发板为蓝桥杯嵌入式开发板stm32f103rbt6，为中型mcu。当涉及两路甚至多路adc通道时，常用的方法有两种dma方法和注入通道，本文采用后者。
adc初始化
void ADC_Config(void)
{
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOB, &GPIO_InitStructure);
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_Init(ADC1, &ADC_InitStructure);
RCC_ADCCLKConfig(RCC_PCLK2_Div6);
/* ADC1 regular channel8 configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 1, ADC_SampleTime_239Cycles5);//对应pb.0
ADC_InjectedChannelConfig(ADC1, ADC_Channel_16, 1, ADC_SampleTime_239Cycles5);
//内部温度传感器
ADC_TempSensorVrefintCmd(ENABLE);//该语句启动内部温度测量
ADC_AutoInjectedConvCmd(ADC1,ENABLE);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* Enable ADC1 reset calibration register */
ADC_ResetCalibration(ADC1);
/* Check the end of ADC1 reset calibration register */
while(ADC_GetResetCalibrationStatus(ADC1));
/* Start ADC1 calibration */
ADC_StartCalibration(ADC1);
/* Check the end of ADC1 calibration */
while(ADC_GetCalibrationStatus(ADC1));
}
adc转换函数
常规通道转换
float Read_ADC_Conv(void)
{
float ADC_Value;
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
while(!ADC_GetFlagStatus(ADC1,ADC_FLAG_EOC));
ADC_Value=ADC_GetConversionValue(ADC1)*3.3/0xfff;
return ADC_Value;
}
注入通道转换
float Read_ADC_InjeConv(void)
{
float ADC_Value;
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
while(!ADC_GetFlagStatus(ADC1,ADC_FLAG_JEOC));
ADC_Value=ADC_GetInjectedConversionValue(ADC1,ADC_InjectedChannel_1);
ADC_ClearFlag(ADC1,ADC_FLAG_JEOC);
return ADC_Value;
}
主程序
int main(void)
{
float temp;
u8 string[20];
STM3210B_LCD_Init();
SysTick_Config(SystemCoreClock/1000);
ADC_Config();
LCD_SetBackColor(White);
LCD_SetTextColor(Blue);
LCD_DisplayStringLine(Line0," ADC Test ");
LCD_DisplayStringLine(Line1," ");
LCD_DisplayStringLine(Line2," Chanel_8-PB0 V: ");
LCD_DisplayStringLine(Line3," ");
LCD_DisplayStringLine(Line4," ");
LCD_DisplayStringLine(Line5," Chanel_16 Temp:");
LCD_DisplayStringLine(Line6," ");
LCD_DisplayStringLine(Line7," ");
LCD_DisplayStringLine(Line8," ");
LCD_DisplayStringLine(Line9," ");
while (1)
{
Delay_Ms(200);
temp=Read_ADC_Conv();
sprintf((char*)string,"%.3f",temp);
LCD_DisplayStringLine(Line3,string);
temp=Read_ADC_InjeConv();
//sprintf((char*)string,"%.3f",(1430-temp*1000)/4.3+25);
sprintf((char*)string,"%.3f",(5855.85-temp*3.3)/17.6085+25);
LCD_DisplayStringLine(Line6,string);
}
}
作者：初入江湖的郭大侠
