main.c

STR711开发板例程：基于STR711的ADC程序

#include "71x_lib.h"

#include "LED.h"

int main(void)
{
    int m,n;
	#ifdef DEBUG
		debug();
	#endif

//	LCD_Init();

	// Configure the used analog input to HI_AIN_
	GPIO_Config(GPIO1, 0x0008, GPIO_HI_AIN_TRI); //AIN.3 p1.3

	// Initialize the conveter register.
	ADC12_Init();
	LED_Init();

	// Configure the prescaler register using the configured PCLK
	// with a sampling frequency=100Hz
	ADC12_PrescalerConfig(100);

	// Select the conversion mode=single channel
	ADC12_ModeConfig(ADC12_SINGLE);

	// Select the channel to be converted
	ADC12_ChannelSelect(ADC12_CHANNEL3);

	// Start the Converter
	ADC12_ConversionStart();
    m=0;
	while(1)
	{
	     int flag=0x0000;

		// Wait until the availabiliy of data in the specific flags
		while(ADC12_FlagStatus(ADC12_DA3) == RESET);

		// Get the conversion result from the correponding Data register
		n = ADC12_ConversionValue(ADC12_CHANNEL3);
		ADC12->CSR &= ~ADC12_DA3;
		flag=(n-m);   //flag=n-m
		if ((flag&0xf000)!=0x0000)   flag=m-n;//flag is the abs(n-m)
		
		if (flag>0x0004)
		{
	    	if (n>m)
	    	   {
		           LED_Set(LED3,GPIO1,LED_ON);  //bigger
		           LED_Set(LED4,GPIO1,LED_OFF);
		       }
		       
		    else
		       {
		           LED_Set(LED3,GPIO1,LED_OFF);  //smaller
		           LED_Set(LED4,GPIO1,LED_ON);
		       }
		}    
        m=n;	
	}
}