查看VR1链接的丝印：XadcAIN3


设置相关寄存器

使用的是通道3，要设置相应的通道寄存器

#include "exynos_4412.h"

int main()
{
	unsigned int AdcValue = 0;

	/*将ADC的精度设置成 12bit*/
	ADCCON = ADCCON | (1 << 16);
	/*使能ADC的分频器*/
	ADCCON = ADCCON | (1 << 14);
	/*设置ADC的分频值， ADC的时钟频率 = PLCK/(19+1) = 5MHZ 
	 * ADC的转换频率 = 5MHZ / 5 = 1MHZ*/
	ADCCON = ADCCON & (~(0xFF << 6)) | (19 << 6);
	/*关闭待机模式，使能正常模式*/
	ADCCON = ADCCON & (~(1 << 2));
	/*关闭读使能通过转换AD*/
	ADCCON = ADCCON & (~(1 << 1));
	/*选择转换通道 3通道*/
	ADCMUX = 3;

	while(1) {
		/*开始转换*/
		ADCCON = ADCCON | 1;
		/*等待转换完成，因为转换需要时间*/
		while(!(ADCCON & (1 << 15)));
		/*读取转换结果*/
		AdcValue = ADCDAT & 0xFFF;
		/*将结果转换成实际的电压值 mv   1800(mv) / (2^12-1) = 0.44*/
		AdcValue = AdcValue * 0.44;
		printf("AdcValue = %dmv\n", AdcValue);
	}
	return 0;
}

ADC实现小作业

1.编程实现通过LED状态显示当前电压范围
注：
电压在1501mv~1800mv时，LED2、LED3、LED4、LED5点亮
电压在1001mv~1500mv时，LED2、LED3、LED4点亮
电压在501mv~1000mv时，LED2、LED3点亮
电压在0mv~500mv时，LED2闪烁

#include "exynos_4412.h"

					/* 点亮LED2 */
#define LED2_ON (GPX2.DAT = GPX2.DAT | (1 << 7))
					/* 熄灭LED2 */
#define LED2_OFF (GPX2.DAT = GPX2.DAT & (~(1 << 7)))
					/* 点亮LED3 */
#define LED3_ON (GPX1.DAT = GPX1.DAT | 1)
					/* 熄灭LED3  */
#define LED3_OFF (GPX1.DAT = GPX1.DAT & (~ 1))
					/* 点亮LED4 */
#define LED4_ON (GPF3.DAT = GPF3.DAT | (1 << 4))
					/* 熄灭LED4 */
#define LED4_OFF (GPF3.DAT= GPF3.DAT & (~(1 << 4)))
					/* 点亮LED5 */
#define LED5_ON (GPF3.DAT = GPF3.DAT | (1 << 5))
					/* 熄灭LED5 */
#define LED5_OFF (GPF3.DAT = GPF3.DAT & (~ (1 << 5)))

/*循环延时*/
void Delay(unsigned int Time) {
	while(Time--);
}

/*初始化呢ADCCON寄存器*/
void ADC_CON(void) {

	/*将ADC的精度设置成 12bit*/
	ADCCON = ADCCON | (1 << 16);
	/*使能ADC的分频器*/
	ADCCON = ADCCON | (1 << 14);
	/*设置ADC的分频值， ADC的时钟频率 = PLCK/(19+1) = 5MHZ 
	 * ADC的转换频率 = 5MHZ / 5 = 1MHZ*/
	ADCCON = ADCCON & (~(0xFF << 6)) | (19 << 6);
	/*关闭待机模式，使能正常模式*/
	ADCCON = ADCCON & (~(1 << 2));
	/*关闭读使能通过转换AD*/
	ADCCON = ADCCON & (~(1 << 1));
	/*选择转换通道 3通道*/
	ADCMUX = 3;
}

int main()
{
	unsigned int AdcValue = 0;
	ADC_CON();
	GPX2.CON = GPX2.CON & (~(0xF << 28)) | (0x1 << 28);
	GPX1.CON = GPX1.CON & (~(0xF)) | (0x1);
	GPF3.CON = GPF3.CON & (~(0xFF << 16)) | (0x11 << 16);

	while(1) {
		/*开始转换*/
		ADCCON = ADCCON | 1;
		/*等待转换完成，因为转换需要时间*/
		while(!(ADCCON & (1 << 15)));
		/*读取转换结果*/
		AdcValue = ADCDAT & 0xFFF;
		/*将结果转换成实际的电压值 mv   1800(mv) / (2^12-1) = 0.44*/
		AdcValue = AdcValue * 0.44;
		/*打印电压值*/
		printf("AdcValue = %dmv\n", AdcValue);

		if(AdcValue >= 1501 && AdcValue <= 1800) {
			/*LED2 LED3 LED4 LED5 点亮*/
			LED2_ON;
			LED3_ON;
			LED4_ON;
			LED5_ON;

		} else if (AdcValue >= 1001 && AdcValue <= 1500) {
			/*LED2 LED3 LED4 点亮*/
			LED5_OFF;
			LED2_ON;
			LED3_ON;
			LED4_ON;
			
		} else if (AdcValue >= 501 && AdcValue <= 1000) {
			/*LED2 LED3 点亮*/
			LED4_OFF;
			LED5_OFF;
			LED2_ON;
			LED3_ON;

		} else if (AdcValue >= 0 && AdcValue <= 500) {
			/*LED2 闪烁*/
			LED3_OFF;
			LED4_OFF;
			LED5_OFF;
			LED2_ON;
			Delay(1000000);
			LED2_OFF;
			Delay(1000000);
		}  


	}
	return 0;
}