大家好!
我在做AD采集引脚电压时遇到问题,我的代码如下,但是采集的电压是错误的,求指正,谢谢!
ADCH &= 0X00; //清EOC标志
APCFG|=0x80;
ADCCFG |= 0X80;
ADCCON3 = 0xb7; //单次转换,参考电压为电源电压,对P07进行采样 //12位分辨率
ADCCON1 = 0X30; //停止A/D
ADCCON1|= 0X40; //启动A/D
while(!(ADCCON1&0x80));
temp[1] = ADCL;
temp[0] = ADCH;
adc = (uint)temp[1]>>2;
adc |= ( (uint) temp[0] )<<6;
num = (adc*3.3)/4096;
另外:在各分辨率下公式是怎样确定的?ADCL和ADCH在各个分辨率下有效位怎么取?
yutou zhao:
参考电压是3.3V
yutou zhao:
回复 ghostyu:
谢谢!问题已经解决!