Posted on March 20, 2014 at 13:52Hi,
I am trying to use ADC for reading the voltage on pin A4.. I wrote an initialization method, however it get stuck in the last WHILE.
Here there is the code:
void ADC_Initialize(void)
{
ADC_InitTypeDef ADC_InitStructure={};
GPIO_InitTypeDef GPIO_InitStructure={};
/* Enable GPIOA clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* Configure PA.4 (ADC Channel 4) in analog mode */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Enable ADC1 clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
/* ADC1 configuration */
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);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* Wait until the ADC1 is ready */
while (ADC_GetFlagStatus(ADC1, ADC_FLAG_ADONS) == RESET);
}
Here some register values read in debug
Status register SR=256,
Control registers CR1=0 and CR2=1.
The problem is the bit ADONS (bit 6 of SR) that is never set.. and i get stuck inside the while...
Any idea why this happens?
#adc #stm32l #discovery
