Posted on April 21, 2013 at 14:58I would like to use stm32f4 to measure a battery voltage, like AA1.5v
I connect the postive line to PC5 and gnd line to GND.
I reference the example code on the Internet. But the code is stop at the while of adc flag. I don't know why it didn't work. If I delete the flag while. the adc value keep 0, it's not i want. I have no idea how to modify my code. And I use gnu tool to build the .bin file. Is it possible that I lose some important compile parameter?
this is me code. thx
uint32_t adcValue=0;
uint32_t adcVoltage=0;
int main()
{
init_adc();
ADC_RegularChannelConfig(ADC1, ADC_Channel_16, 1, ADC_SampleTime_3Cycles);
while(1){
//Start ADC1 Conversion
ADC_SoftwareStartConv(ADC1);
while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
adcValue= ADC_GetConversionValue(ADC1);
adcVoltage = adcValue * (5.0/4096.0);
}
}
void init_adc()
{
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
//Enable ADC1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
//Enable the ADC1 GPIO Clock
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
//Initializing GPIO for ADC
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOC, &GPIO_InitStructure);
//ADC Common Init
//Use Independent mode
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
//ADC1 Init
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_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
//Enabling Temperature sensor
ADC_TempSensorVrefintCmd(ENABLE);
//Enable ADC1
ADC_Cmd(ADC1, ENABLE);
}
#stm32f4-adc-battery
