ad.c

该源码是创维特ARM7 JX44B0X板的例子程序

#include <stdio.h>
#include <sys/time.h>
#include <signal.h>
#include "../include/44b.h"

struct timeval tpstart;

#define MAX_VALUE                       0x3ff
#define MIN_VALUE                       0x0
                                                                                       
char display_buffer[6];
int refresh_index = 0;
                                                                                       
unsigned char seg7table[16] =
{
    /* 0       1       2       3       4       5       6      7*/
    0xc0,   0xf9,   0xa4,   0xb0,   0x99,   0x92,   0x82,   0xf8,
                                                                                       
    /* 8       9      A        B       C       D       E      F*/
    0x80,   0x90,   0x88,   0x83,   0xc6,   0xa1,   0x86,   0x8e,
};

void ad_poll_timer(int signo)
{
    if(refresh_index == 2) refresh_index ++;
    if(refresh_index == 5) refresh_index =0;

    *((unsigned char*) 0x02000006) = 0x3f & ~(0x01 << refresh_index);
    *((unsigned char*) 0x02000004) = seg7table[display_buffer[refresh_index]];
    refresh_index ++;
}

char trans_input(int value)
{
    if(value == MAX_VALUE) return 100;

    return(char )(value * 100 / (MAX_VALUE-MIN_VALUE));
}
int ad_poll(int argc, char **argv)
{
    int loop_delay;
    int data = 0;
    int get_index;
    
    int value;
    int rADCDAT_TEMP0,rADCDAT_TEMP1,rADCDAT_TEMP2,rADCDAT_TEMP3,
                    rADCDAT_TEMP4,rADCDAT_TEMP5,rADCDAT_TEMP6,rADCDAT_TEMP7;
                                                                                       
    rADCPSR=0x0;
                                                                                       
    data = 0;
                                                                                       
    for(get_index = 0; get_index < 16; get_index++)
    {
         rADCCON=0x1|(0x2<<2);   // AIN2
         while(!(rADCCON & 0x40));
         data+=rADCDAT;
    }
                                                                                       
    data /= 32;
                                                                                       
    value = trans_input(data);
    display_buffer[0] = value / 100;
    display_buffer[1] = value % 10;

    return value;
}