#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 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 ++;}void init_sigaction(void){    struct sigaction act;    act.sa_handler=poll_timer;    act.sa_flags=0;    sigemptyset(&act.sa_mask);    sigaction(SIGPROF,&act,NULL);    /* begin get the time */    gettimeofday(&tpstart,NULL);}void init_time(){    struct itimerval value;    value.it_value.tv_sec=0;    value.it_value.tv_usec=1;    value.it_interval=value.it_value;    setitimer(ITIMER_PROF,&value,NULL);}char trans_input(int value){    if(value == MAX_VALUE) return 50;    return(char )(value * 50 / (MAX_VALUE-MIN_VALUE));}/* * timer application code * compile : *          $arm-elf-gcc -Wl,-elf2flt -o ad ad.c *          $cp ad /tftpboot/examples * run in target: *          #cd /var *          #ftp 192.168.1.180 *          ftp>bin *          ftp>cd /tftpboot/examples *          ftp>get ad *          ftp>by  *          #./ad */int main(int argc, char **argv){    int loop_delay;    int data = 0;    int get_index;     rCLKCON=0x7ff8;    init_sigaction();    init_time();                                                                                           while(1)    {	        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 / 10;                display_buffer[1] = value % 10;                                                                                                       data = 0;                                                                                                       for(get_index = 0; get_index < 16; get_index++)                {                        rADCCON=0x1|(0x3<<2);   // AIN3                        while(!(rADCCON & 0x40));                        data+=rADCDAT;                }                data /= 32;                                                                                                       value = trans_input(data);                                                                   display_buffer[3] = value / 10;                display_buffer[4] = value % 10;    }    exit(0);}