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#ifndef __ADC1_H_
#define __ADC1_H_
#include "common.h"
#include "delay.h"
void adc_init(u8 ch,u8 div);
u16 adc_cover(u8 ch);
#endif
#include "adc1.h"
void adc_init(u8 ch,u8 div)//最大时钟不得大于12.4M
{
//打开ADC和IO口时钟
LPC_SC->PCONP |= (1<<15)|(1<<12);
switch(ch)
{
case 0:
LPC_IOCON->P0_23 = 0x00;
LPC_IOCON->P0_23 |= (1<<0)|(1<<8)|(1<<10);//无过滤 模拟adc 开漏
break;
case 1:
LPC_IOCON->P0_24 = 0x00;
LPC_IOCON->P0_24 |= (1<<0)|(1<<8)|(1<<10);//无过滤 模拟adc 开漏
break;
case 2:
LPC_IOCON->P0_25 = 0x00;
LPC_IOCON->P0_25 |= (1<<0)|(1<<8)|(1<<10);//无过滤 模拟adc 开漏
break;
case 3:
LPC_IOCON->P0_26 = 0x00;
LPC_IOCON->P0_26 |= (1<<0)|(1<<8)|(1<<10);//无过滤 模拟adc 开漏
break;
case 4:
LPC_IOCON->P0_30 = 0x00;
LPC_IOCON->P0_30 |= (3<<0)|(1<<8)|(1<<10);//无过滤 模拟adc 开漏
break;
case 5:
LPC_IOCON->P0_31 = 0x00;
LPC_IOCON->P0_31 |= (3<<0)|(1<<8)|(1<<10);//无过滤 模拟adc 开漏
break;
case 6:
LPC_IOCON->P0_12 = 0x00;
LPC_IOCON->P0_12 |= (3<<0)|(1<<8)|(1<<10);//无过滤 模拟adc 开漏
break;
case 7:
LPC_IOCON->P0_13 = 0x00;
LPC_IOCON->P0_13 |= (3<<0)|(1<<8)|(1<<10);//无过滤 模拟adc 开漏
break;
}
LPC_ADC->CR = 0X00;
LPC_ADC->CR |= (1<<ch)|(div<<8)|(1<<21);//正常工作 非规则转换 并选中响应通道
LPC_ADC->INTEN = 0x00;//禁用全部中断
}
u16 adc_cover(u8 ch)
{
u16 temp;
LPC_ADC->CR &= ~(0x000000ff);
LPC_ADC->CR |= (1<<ch);
LPC_ADC->CR |= 1<<24;//启动转换
while(!(LPC_ADC->GDR &(1u<<31)));//等待转换结束
temp = (u16)((LPC_ADC->GDR & 0x00000fff0)>>4);
return temp;
}
#ifndef __ADC_H_
#define __ADC_H_
#include "common.h"
#define DAC_IO_CON LPC_IOCON->P0_26
void dac_init(void);
void dac_set_value(u16 value);
#endif
#include "dac.h"
void dac_init(void)
{
//io口初始化
DAC_IO_CON = 0x00;
DAC_IO_CON |= (2<<0)|(1<<16)/*|(1<<10)*/;//使能DAC
LPC_DAC->CTRL = 0x00;//双缓冲禁止,超时禁止 DMA禁止
LPC_DAC->CR = 1<<16;
// LPC_DAC->CNTVAL = 100;
}
void dac_set_value(u16 value)
{
if(value > 1024)
{
return;
}
else
{
LPC_DAC->CR = (u16)((1<<16)|(value<<6));
}
}
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原文地址：http://www.cnblogs.com/dengxiaojun/p/4338703.html
