Cubieboard1显示DS18B20温度信息到LED

• 
  

• #include <stdio.h>

• #include <stdlib.h>

• #include <string.h>

• #include <time.h>

• #include <signal.h>

• #include <pthread.h>

• #include "gpio_lib.h"

• 
  

• #define LSBFIRST 0

• #define MSBFIRST 1

• #define  DISPBUF_LEN 8

• 
  

• typedef unsigned char byte;

• 
  

• // w1-thermal(DS18B20) device file, change it in your case.

• const char* DS18B20_DEVICE="/sys/bus/w1/devices/28-000004f0230d/w1_slave";

• 
  

• /*

• * 74HC595 relative stuff

• */

• // Cubieboard pin connected to ST_CP of 74HC595 (RCK)

• unsigned int latchPin = SUNXI_GPB(11);

• // Cubieboard pin connected to SH_CP of 74HC595 (SCK)

• unsigned int clockPin = SUNXI_GPB(13);

• // Cubieboard pin connected to DS of 74HC595 (DIN)

• unsigned int dataPin = SUNXI_GPH(7);

• 
  

• /*

• * Display relative stuff

• */

• // Digits: "0,1,2,....,9" for common anode 8-segment-LED

• unsigned int digit_tab[] = { 0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92,

•                         0x82, 0xf8, 0x80, 0x90};

• // Digits with a ‘dot‘ at the right-bottom corner

• unsigned int digitdot_tab[] = { 0xc0&0x7f, 0xf9&0x7f, 0xa4&0x7f,

•                         0xb0&0x7f, 0x99&0x7f, 0x92&0x7f, 0x82&0x7f,

•                         0xf8&0x7f, 0x80&0x7f, 0x90&0x7f};

• // Symbols: ‘clear‘, ‘dot‘, ‘-‘

• unsigned int symbol_tab[]={ 0xff, 0x7f, 0xbf};

• // LED display buffer

• static char dispbuf[DISPBUF_LEN];

• 
  

• 
  

• /**

• * Set Cubieboard‘s GPIO port-D pin I/O mode: INPUT/OUTPUT

• */

• void pinMode(unsigned int pin, unsigned int io_mode)

• {

•     if (SETUP_OK != sunxi_gpio_set_cfgpin(pin, io_mode))

•     {

•         printf("Failed to config GPIO pin\n");

•     }

• }

• 
  

• /**

• * Set Cubieboard‘s GPIO port-D pin value(LOW/HIGH)

• */

• void digitalWrite(int pin, int hl)

• {

•     if (sunxi_gpio_output(pin, hl))

•     {

•         printf("Failed to set GPIO pin value\n");

•     }

• }

• 
  

• /**

• * Arduino shiftOut:

• * https://github.com/arduino/Ardui ... uino/wiring_shift.c

• */

• void shiftOut(unsigned int dataPin, unsigned int clockPin, int bitOrder, byte val)

• {

•     byte i;

•     for (i = 0; i < 8; i++)

•     {

•         if (bitOrder == LSBFIRST)

•             digitalWrite(dataPin, ! !(val & (1 << i)));

•         else

•             digitalWrite(dataPin, ! !(val & (1 << (7 - i))));

• 
  

•         digitalWrite(clockPin, HIGH);

•         digitalWrite(clockPin, LOW);

•     }

• }

• 
  

• /**

• * Initialize the GPIO & relative pins

• */

• void init_gpio()

• {

•     if (SETUP_OK != sunxi_gpio_init())

•     {

•         printf("Failed to initialize GPIO\n");

•     }

•     pinMode(latchPin, OUTPUT);

•     pinMode(clockPin, OUTPUT);

•     pinMode(dataPin, OUTPUT);

• }

• 
  

• /**

• * Get current temperature from the w1-thermal device

• */

• void get_temperature(char* tempbuf, int len)

• {

•     FILE* fp=fopen(DS18B20_DEVICE,"r");

•     char* line=NULL;

•     char* temperature_tok=NULL;

•     int temperature=0;

• 
  

•     int n;

•     if(!fp){

•         fprintf(stderr,"Failed to open device(%s) file!\n", DS18B20_DEVICE);

•         return;

•     }

• 
  

•     // skip the first line

•     getline(&line, &n, fp);

•     free(line);

•     line=NULL;

• 
  

•     // get the temperature line

•     getline(&line, &n, fp);

•     strtok(line,"=");

•     temperature_tok=strtok(NULL,"\n");

• 
  

•     strncpy(tempbuf, temperature_tok, len);

• 
  

•     free(line);

•     fclose(fp);

• }

• 
  

• /**

• * Thread of filling the time infomation into display buffer

• */

• void* time_to_dispbuf()

• {

•     time_t timep;

•     struct tm *p;

•     char timebuf[4];

•     int interval=1; // in seconds

• 
  

•     while(1){

•         // get localtime

•         time(&timep);

•         p = localtime(&timep);

•         sprintf(timebuf, "%02d%02d", p->tm_hour, p->tm_min);

• 
  

•         dispbuf[0]=digit_tab[timebuf[0] - ‘0‘];

•         dispbuf[1]=digitdot_tab[timebuf[1] - ‘0‘];

•         dispbuf[2]=digit_tab[timebuf[2] - ‘0‘];

•         dispbuf[3]=digit_tab[timebuf[3] - ‘0‘];

•         dispbuf[4]=symbol_tab[2]; // ‘-‘

• 
  

•         sleep(interval);

•     }

• }

• 
  

• /**

• * Thread of filling the temperature into display buffer

• */

• void* temp_to_dispbuf()

• {

•     char tempbuf[3];

•     int interval=5; // in seconds;

• 
  

•     while(1){

•         get_temperature(tempbuf, sizeof tempbuf);

• 
  

•         dispbuf[5]=digit_tab[tempbuf[0]-‘0‘];

•         dispbuf[6]=digitdot_tab[tempbuf[1]-‘0‘];

•         dispbuf[7]=digit_tab[tempbuf[2]-‘0‘];

• 
  

•         sleep(interval);

•     }

• 
  

• }

• 
  

• int main(int argc, char **argv)

• {

•     pthread_t get_time_thread, get_temp_thread;

•     void * thread_ret;

• 
  

•     init_gpio();

• 
  

•     pthread_create( &get_time_thread, NULL, time_to_dispbuf, NULL);

•     pthread_create( &get_temp_thread, NULL, temp_to_dispbuf, NULL);

• 
  

•     while (1)

•     {

• 
  

•         int i;

•         for(i=0;i<DISPBUF_LEN;i++){

•             digitalWrite(latchPin, 0);

•             shiftOut(dataPin, clockPin, MSBFIRST, 1<<i);

•             shiftOut(dataPin, clockPin, MSBFIRST, dispbuf);

•             digitalWrite(latchPin, 1);

•             usleep(2000);

•         }

• 
  

•     }

• 
  

•     pthread_join(get_time_thread,&thread_ret);

•     pthread_join(get_temp_thread,&thread_ret);

•     return 0;

• }

• 
  

原文作者：soloforce
原文链接：http://forum.cubietech.com/forum ... 1545&extra=page%3D1