#include
#include"lcd12864.h"
#include"BoardConfig.h"
#define Num_of_Results 32
static uint results[Num_of_Results]; //保存ADC转换结果的数组
void int_adc()
{
P6SEL |= 0x01; //选择AD转换通道
ADC12CTL0 = ADC12ON+MSC+SHT0_8; // 采样保持时间为16个ADC12CLK
//参考电压为2.5V
ADC12CTL1 = SHP+CONSEQ_2; // 多通道单次转换模式
ADC12MCTL0 =0x10; // 使能转换
ADC12IE = 0x01; // 使能ADC中断
ADC12CTL0|=ENC; //使能AD转化器
ADC12CTL0|=ADC12SC;
_EINT();
}
/*******************************************
函数名称：Trans_val
功 能：将16进制ADC转换数据变换成三位10进制
真实的模拟电压数据，并在液晶上显示
参 数：Hex_Val--16进制数据
n--变换时的分母等于2的n次方
返回值 ：无
********************************************/
void Trans_val1(uint Hex_Val)
{
unsigned long caltmp;
uint Curr_Volt;
caltmp = Hex_Val;
caltmp = (caltmp << 5) + Hex_Val; //caltmp = Hex_Val * 33
caltmp = (caltmp <<3) + (caltmp << 1); //caltmp = caltmp *10
Curr_Volt = caltmp >> 12; //Curr_Volt = caltmp / 2^n
uchar t1,t2,t3;
t1=Curr_Volt/100;
t2=Curr_Volt%100/10;
t3=Curr_Volt%10;
Write_Cmd(0x90);Delay_1ms();
Write_Data(t1+0x30);Delay_1ms();
Write_Data('.');Delay_1ms();
Write_Data(t2+0x30);Delay_1ms();
Write_Data(t3+0x30);Delay_1ms();
Write_Data('V');Delay_1ms();
}
void Trans_val2(uint Hex_Val)
{
unsigned long caltmp;
unsigned long Curr_Volt;
caltmp = Hex_Val;
caltmp = (caltmp << 5) + Hex_Val; //caltmp = Hex_Val * 33
caltmp = (caltmp <<3) + (caltmp << 1); //caltmp = caltmp *10
Curr_Volt = caltmp >> 12; //Curr_Volt = caltmp / 2^n
uchar v1,v2,v3;
Curr_Volt=Curr_Volt*71;
v1=Curr_Volt/10000;
v2=Curr_Volt%10000/1000;
v3=Curr_Volt/100%10;
Write_Cmd(0x98);Delay_1ms();
Write_Data(v1+0x30);Delay_1ms();
Write_Data('.');Delay_1ms();
Write_Data(v2+0x30);Delay_1ms();
Write_Data(v3+0x30);Delay_1ms();
Write_Data('V');Delay_1ms();
}
void init()
{
WDTCTL = WDTPW + WDTHOLD; //关狗
BoardConfig(0xb8);
Ini_Lcd(); //初始化液晶
Clear_GDRAM();
display_string(0,0,"电压峰值：");
display_string(2,0,"有效值：");
}
/*******************************************
函数名称：ADC12ISR
功 能：ADC中断服务函数，在这里用多次平均的
计算P6.0口的模拟电压数值
参 数：无
返回值 ：无
********************************************/
#pragma vector=ADC_VECTOR
__interrupt void ADC12ISR (void)
{
static uint index = 0;
results[index++] = ADC12MEM0; // Move results
if(index == Num_of_Results)
{
uchar i;
unsigned long sum = 0;
index = 0;
for(i = 0; i < Num_of_Results; i++)
{
sum += results;
}
sum >>= 5; //除以32
Trans_val1(sum);
Trans_val2(sum);
}
}
/***************************主函数*************************/
int main(void)
{
init();
int_adc();
while(1);
}
这是我写的AD转化程序，可是只能转换单片机内部的电压，如果是转换外接信号（假如+1V的直流电压）时转换的结果是不对的，为什么呢
本帖最后由 paulhyde 于 2014-9-15 04:09 编辑
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