The S3C2440A has an internal 10-bit analog-to-digital converter (ADC) with 8 analog signal inputs.
The registers used are:
ADCCON: used to select channel, set frequency, start conversion, and end mark
ADC frequency = PCLK/(ADCCON[13:6]+1)
ADCDATn: used to read the conversion result of ADC channel n: ADCDATn[9:0]
The following is an experimental program for ADC channel 0:
//********************************************************************
#define adc_frequency 2000000
void Main(void)
{
int i;
...Hardware initialization...
Uart_Printf("ADC experiment nn");
rADCCON = 1<<3 | (PCLK/adc_frequency - 1)<<6 | 1<<14 ; //Select channel 1, set ADC frequency, the frequency is valid
while(1)
{
rADCCON|=0x1; //Start ADC
while(!(rADCCON & 0x8000)); //Wait for the conversion to complete
Uart_Printf("AIN1: %dn",rADCDAT0&0x3FF); //Output the conversion result
Delay(1000); //Delay for 1 second
}
}
//***********************************************************************
The results are as follows:
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