ADC实验

查看VR1链接的丝印：XadcAIN3
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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
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#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;
}