LPC1788的ADC和DAC使用

#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));

}

}