Posted on April 02, 2007 at 05:24Hi!
I am new with the STR71 and I am trying to use the ADC to sample four different analog inputs, so, I think I can use Round Robin mode.
This is my code for init the ADC using the ST libraries:
// Configure the 4 ADC analog input pin to High Impedance Analog Input
GPIO_Config (GPIO1, ADC12_DA0, GPIO_HI_AIN_TRI);
GPIO_Config (GPIO1, ADC12_DA1, GPIO_HI_AIN_TRI);
GPIO_Config (GPIO1, ADC12_DA2, GPIO_HI_AIN_TRI);
GPIO_Config (GPIO1, ADC12_DA3, GPIO_HI_AIN_TRI);
// Initialize the ADC Registers
ADC12_Init();
// Configure the ADC Prescaler
ADC12_PrescalerConfig(500);
// Select the round robin mode of conversion
ADC12_ModeConfig (ADC12_ROUND);
//Enable the converter
ADC12_ConversionStart();
And in my program:
if((ADC12_FlagStatus(ADC12_DA0)==SET)||(ADC12_FlagStatus(ADC12_DA1)==SET)||(ADC12_FlagStatus(ADC12_DA0)==SET)||(ADC12_FlagStatus(ADC12_DA0)==SET))
{
//Disable the converter
ADC12_ConversionStop();
if(ADC12_FlagStatus(ADC12_DA0)==SET) Line1=ADC12_ConversionValue(ADC12_CHANNEL0);
if(ADC12_FlagStatus(ADC12_DA1)==SET) Line2=ADC12_ConversionValue(ADC12_CHANNEL1);
if(ADC12_FlagStatus(ADC12_DA2)==SET) Line3=ADC12_ConversionValue(ADC12_CHANNEL2);
if(ADC12_FlagStatus(ADC12_DA3)==SET) Line4=ADC12_ConversionValue(ADC12_CHANNEL3);
//Clear all flags writing low
ADC12->CSR &= (~(ADC12_DA0| ADC12_DA1| ADC12_DA2| ADC12_DA3));
//Enable the converter again
ADC12_ConversionStart();
}
I can emulate the program step by step (with the RLink from Raisonance in Flash memory) and everything is o.k. but when I use the run option, the ADC doesn’t work. I think that it’s not due to the ADC calibration and in my application it is not necessary.
Can anybody help me?
