<ARM>
=ADC
=ADC_Init()함수에 INIT FLAG 추가
=ADC_Run()함수 추가
1. Init 완료전이면 return -1;
2. ADC_DRDY가 HIGH(CONVERSION완료)되기까지 대기
3. 변환된 값중 하위 10 BIT 만 추출
#define AT91C_ADC_LDATA (0x3FF << 0) // (ADC) Last Data Converted |
=
<ADC.H>
#ifndef __ADC_H__
#define __ADC_H__
#include <AT91SAM7S256.h>
#define PRESCAL 8
void ADC_Init(void);
int ADC_Run(void);
#endif //__ADC_H__ |
<ADC.C>
#include "adc.h"
unsigned int uiInitFlag = 0; // INIT FLAT
void ADC_Init(void)
{
*AT91C_PMC_PCER = 1<<AT91C_ID_ADC; //Peripheral Clock Enable Register //p34 // 전원 공급
*AT91C_ADC_CR = AT91C_ADC_SWRST; // (ADC) Software Reset
*AT91C_ADC_CHER = AT91C_ADC_CH4; // (ADC) ADC Channel Enable Register
*AT91C_ADC_MR = (5 << PRESCAL) &(~(AT91C_ADC_LOWRES_8_BIT));// PRESCALE : 5 -> 4M clk 분해능 10BIT
uiInitFlag = 1;
return;
}
int ADC_Run(void)
{
if(0 == uiInitFlag)
{
return -1;
}
*AT91C_ADC_CR = AT91C_ADC_START; // (ADC) Start Conversion
while(0==(*AT91C_ADC_SR &AT91C_ADC_DRDY)); // High 신호 대기 (convert완료 대기 )
return (int)(*AT91C_ADC_LCDR& AT91C_ADC_LDATA); // 하위 10bit 추출
}
|
<PROJECT.H>
#ifndef _PROJECT_H
#define _PROJECT_H
#include "AT91SAM7S256.h"
#define MCK 48000000
// 2008.09.10.
#ifndef __ASSEMBLY__
#include "lcd.h"
#include "adc.h"
void default_fiq_handler();
void default_irq_handler();
void default_spurious_handler();
#endif
// 2008.09.10.
#endif // _PROJECT_H |
<MAIN.C>
#include <project.h>
void Init(void)
{
LCD_Init();
ADC_Init();
return;
}
int main(void)
{
volatile unsigned int uiCnt;
unsigned char ucVal[] = "1023";
int iVal;
Init();
while (1)
{
iVal = ADC_Run();
if(-1 == iVal)
{
LCD_Print("Error");
while(1);
}
ucVal[0] = '0' + (iVal/1000);
ucVal[1] = '0' + (iVal%1000)/100;
ucVal[2] = '0' + (iVal%100)/10;
ucVal[3] = '0' + (iVal%10);
LCD_Inst(LCD_INST_HOME);
LCD_Print(ucVal);
for(uiCnt = 0; uiCnt < 65000; ++uiCnt);
for(uiCnt = 0; uiCnt < 65000; ++uiCnt);
for(uiCnt = 0; uiCnt < 65000; ++uiCnt);
for(uiCnt = 0; uiCnt < 65000; ++uiCnt);
}
while (1);
return 0;
} |
=결과
1. 온도센서 연결
2. 전원 / GND 연결
-소스파일
20150917_ARM_ADC_LCD_DISPLAY.zip
