Posted on May 17, 2011 at 14:15ST advise, ''Before starting a calibration the ADC must have been in power-off state (ADON bit = ‘0’) for at least two ADC clock cycles.''
But ... your code looks very like mine (which works).
void ADC_Configuration(void)
{
ADC_InitTypeDef ADC_InitStructure;
//ADC_ContinuousConvMode conversion in Continuous or Single mode
//ADC_DataAlign ADC data alignment is left or right.
//ADC_ExternalTrigConv external trigger for conversion of regular channels
//ADC_Mode ADC to operate in independent or dual mode
//ADC_NbrOfChannel channels converted using sequencer for regular channel group. range 1..16
//ADC_ScanConvMode scan (multichannels) or single (one channel) mode
//Deinitialize the ADCx peripheral registers to their default reset values.
ADC_DeInit(ADC1);
//ADC1 Configuration
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_Init(ADC1, &ADC_InitStructure);
//Enable ADC1 powers ADC for first time (CR2_ADON was 0)
ADC_Cmd(ADC1, ENABLE);
ADC_ResetCalibration(ADC1);
while(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1);
while(ADC_GetCalibrationStatus(ADC1));
}
I wonder if you have a high level of optimisation which is messing up the status check.
Do you have a valid VRef? I don't know if this is required.
