Raspberry PI Model B + (LCD display CPU temperature)

Source: Internet
Author: User
Tags sprintf

Title:raspberry PI Model B + (LCD display CPU temperature)--2015-01-29 17:44

Bought a block connected to the raspberry PI Model B + LCD display, the above does not write CPU temperature, processing the next.

Modified PCD8544_RPI.C:

/*================================================================================= NAME:PCD8544_RPI.C Version : 0.1 Copyright (C) by Andre Wussow, (+), [email protected] description:a simple PCD8544 LCD (Nokia33     10/5110) for Raspberry Pi for displaying some system informations. Makes use of wiringpi-library of Gordon Henderson (https://projects.drogon.net/raspberry-pi/wiringpi/) Recommended Co  Nnection (http://www.raspberrypi.org/archives/384): LCD pins Raspberry Pi lcd1-gnd p06-gnd LCD2-      VCC p01-3.3v lcd3-clk p11-gpio0 lcd4-din p12-gpio1 lcd5-d/c P13-gpio2 Lcd6-cs P15-gpio3 lcd7-rst P16-gpio4 lcd8-led p01-3.3v ============================================== ==================================this Library is free software; You can redistribute it and/ormodify it under the terms of the GNU Lesser General Publiclicense as published by the free S Oftware FoUndation; Eitherversion 2.1 of the License, or (at your option) any later version. This library was distributed in the hope that it'll be useful,but without any WARRANTY;  Without even the implied warranty ofmerchantability or FITNESS for A particular PURPOSE. See the Gnulesser general public License for more details.============================================================ ==================== */#include <wiringPi.h> #include <stdint.h> #include <stdio.h> #include < stdlib.h> #include <string.h> #include <sys/sysinfo.h> #include "PCD8544.h" #include <sys/types.h > #include <sys/stat.h> #include <fcntl.h> #define TEMP_FILE_PATH "/sys/class/thermal/thermal_zone0/   Temp "#define MAX_SIZE//pin Setupint _din = 1;int _SCLK = 0;int _dc = 2;int _rst = 4;int _cs = 3;  LCD Contrast//may is need modify to fit your screen! NORMAL:30-90, default IS:45!!!    Maybe modify this value!int contrast = 55; int main (void) {//print infos printf("Raspberry Pi PCD8544 sysinfo display\n");     printf ("========================================\n");    Check WIRINGPI Setup if (wiringpisetup () = = 1) {printf ("wiringpi-error\n");  Exit (1);  }//init and Clear LCD Lcdinit (_SCLK, _din, _DC, _cs, _rst, contrast);     Lcdclear ();     Show logo Lcdshowlogo ();     Delay (2000);  for (;;)             {//Clear LCD lcdclear ();      Get system usage/info struct SysInfo sys_info;      if (SysInfo (&sys_info)! = 0) {printf ("sysinfo-error\n");      }//Uptime char uptimeinfo[15];      unsigned long uptime = SYS_INFO.UPTIME/60;             sprintf (Uptimeinfo, "Uptime%ld min.", Uptime);      CPU info char cpuinfo[10];      unsigned long avgcpuload = sys_info.loads[0]/1000;             sprintf (CpuInfo, "CPU%ld%%", avgcpuload);      Ram info char raminfo[10];      unsigned long totalram = sys_info.freeram/1024/1024; sprintf (Raminfo, "RAM%ld MB", TotaLram);      CPU temperature char cputemperature[15];      float Cpu_temperature_result = Get_cpu_temperature ();             sprintf (Cputemperature, "TEMP%.2f ^c", Cpu_temperature_result);      Build screen lcddrawstring (0, 0, "Raspberry Pi:");      Lcddrawline (0, ten,----);      Lcddrawstring (0, Uptimeinfo);      Lcddrawstring (0, CpuInfo);      Lcddrawstring (0, Raminfo);      Lcddrawstring (0, cputemperature);             Lcddisplay ();  Delay (1000); }//for (;;)  {//printf ("LED on\n");  Digitalwrite (PIN, 1);  Delay (250);  printf ("LED off\n");  Digitalwrite (PIN, 0);  Delay (250); } return 0;}     int get_cpu_temperature (void) {int fd;    Double temp = 0;            Char Buf[max_size];     Open/sys/class/thermal/thermal_zone0/temp fd = open (Temp_file_path, o_rdonly);         if (FD < 0) {fprintf (stderr, "failed to open thermal_zone0/temp\n");     return-1; }//Read content if (Read (FD, buf, max_size) < 0)         {fprintf (stderr, "failed to read temp\n");     return-1;            }//Convert to floating-point number Print temp = atoi (buf)/1000.0;    Closes file close (FD); return temp;}


Under Compile execution:

Cc-o cpushow pcd8544_rpi.c PCD8544.C-L/USR/LOCAL/LIB-LWIRINGPI


Because ℃ and °c show a problem, we use ^ instead of that point.

Raspberry PI Model B + (LCD display CPU temperature)

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