Posted on April 24, 2007 at 09:32I am using the ST sw library to calculate A/D value (for a touch screen). I can read correctly the AD_CHANNEL1 but not the AD_CHANNELL0. The voltage at the A/D micro is correct. I am using the OneShot method but I tried also the Scan. What's wrong in my sw (I attached the main A/D part)?
GPIO_Init(GPIO1, &GPIO_InitStructure);
/* ADC Channel pin configuration */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3 ;
GPIO_Init(GPIO0, &GPIO_InitStructure);
Delay(10000);
ADC_InitStructure.ADC_ConversionMode = ADC_ConversionMode_OneShot;
ADC_InitStructure.ADC_ExtTrigger = ADC_ExtTrigger_Disable;
ADC_InitStructure.ADC_AutoClockOff = ADC_AutoClockOff_Disable;
ADC_InitStructure.ADC_SamplingPrescaler = 0;
ADC_InitStructure.ADC_ConversionPrescaler = 0;
ADC_InitStructure.ADC_FirstChannel = ADC_CHANNEL0;
ADC_InitStructure.ADC_ChannelNumber = 2;
ADC_Init(&ADC_InitStructure);
Delay(10000);
/* Enable ADC */
ADC_Cmd(ENABLE);
Delay(10000);
/* Start conversion */
ADC_ConversionCmd(ADC_Conversion_Start);
.........................................
while(1) // Main loop
{
....................................
Delay(10000);
y_Touch=ADC_GetConversionValue(ADC_CHANNEL1);
x_Touch=ADC_GetConversionValue(ADC_CHANNEL0);
ADC_ConversionCmd(ADC_Conversion_Start); }
....................................
}
