Add status monitor example

example.c

@@ -0,0 +1,228 @@
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <linux/i2c-dev.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <ifaddrs.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <linux/if_link.h>
+#include <signal.h>
+
+//#include "ssd1306.h"
+#include "spilcd_gfx.h"
+#include "spilcd_font.h"
+
+
+#define NI_MAXHOST 1025 
+#define NI_MAXSERV 32
+
+volatile sig_atomic_t done = 0;
+struct sigaction action;
+
+//extern FONT_INFO    *_font; 
+
+/**
+ * 
+ * @return 
+ */
+float GetCPULoad() {
+    int FileHandler;
+    char FileBuffer[1024];
+    float load;
+
+    FileHandler = open("/proc/loadavg", O_RDONLY);
+    if(FileHandler < 0) {
+        return -1; }
+    read(FileHandler, FileBuffer, sizeof(FileBuffer) - 1);
+    sscanf(FileBuffer, "%f", &load);
+    close(FileHandler);
+    return load;
+}
+
+/**
+ * 
+ * @return 
+ */
+float GetMemUsage() {
+    int FileHandler;
+    char FileBuffer[1024];
+    int memTotal, memFree, memAvail, memBuf,memCached;
+    float result;
+    FileHandler = open("/proc/meminfo", O_RDONLY);
+    if(FileHandler < 0) {
+        return -1; }
+    read(FileHandler, FileBuffer, sizeof(FileBuffer) - 1);
+    sscanf(FileBuffer, "MemTotal:         %d kB\n MemFree:          %d kB\n MemAvailable:          %d kB\n Buffers:           %d kB\n Cached:           %d kB",
+     &memTotal, &memFree, &memAvail, &memBuf, &memCached);
+    close(FileHandler);
+    result = 1.0 - (float)(memFree + memCached) / memTotal;
+    return result;
+}
+/**
+ * 
+ * @return 
+ */
+int GetCPUTemp() {
+   int FileHandler;
+   char FileBuffer[1024];
+   int CPU_temp;
+   FileHandler = open("/sys/devices/virtual/thermal/thermal_zone0/temp", O_RDONLY);
+   if(FileHandler < 0) {
+      return -1; }
+   read(FileHandler, FileBuffer, sizeof(FileBuffer) - 1);
+   sscanf(FileBuffer, "%d", &CPU_temp);
+   close(FileHandler);
+   return CPU_temp / 1000;
+}
+
+void sig_handler(int signo)
+{
+    done = 1;
+    printf("received signo :%d \n", signo);
+}
+
+
+/*
+ * 
+ */
+int main(int argc, char** argv) {
+    time_t mytime;
+    struct tm *tm;
+    uint8_t time_buffer[80];
+    uint8_t text_buffer[100];    
+    struct ifaddrs *ifaddr, *ifa;
+    int family, s, n, row;
+    char host[NI_MAXHOST];
+
+    
+    // Print pid, so that we can send signals from other shells
+    printf("My pid is: %d\n", getpid());    
+    memset(&action, 0, sizeof(struct sigaction));
+    action.sa_handler = sig_handler;
+    // Intercept SIGHUP and SIGINT
+    if (sigaction(SIGINT, &action, NULL) == -1) {
+        perror("Error: cannot handle SIGINT"); // Should not happen
+    }
+    if (sigaction(SIGTERM, &action, NULL) == -1) {
+        perror("Error: cannot handle SIGTERM"); // Should not happen
+    }
+
+    wiringPiSetup();
+
+    lcd_t* lcd = lcd_init(40000000, 1, 10, 7, 8);
+
+    while (done == 0) {
+        row = 2;
+        //_font = (FONT_INFO*)&ubuntuMono_8ptFontInfo;
+        /* Display time */
+        mytime = time(NULL);
+        tm = localtime (&mytime);
+        //ssd1306ClearScreen(LAYER0 | LAYER1) ;
+	lcd_fillScreen(lcd, 0, 0, 0);
+        strftime(time_buffer, 80,"  %H:%M:%S %x", tm);
+        //ssd1306DrawString(0,  row * 8, time_buffer, 1, WHITE, LAYER0);
+	lcd_drawText(lcd, 0, row * 8, time_buffer, 255, 255, 255);
+        row++;
+
+        /* Display IP */
+        /* Get network information */
+        if (getifaddrs(&ifaddr) == -1) 
+        {
+            perror("getifaddrs");
+            exit(EXIT_FAILURE);
+        }
+        /* Walk through linked list, maintaining head pointer so we
+          can free list later */
+        for (ifa = ifaddr, n = 0; ifa != NULL; ifa = ifa->ifa_next, n++) {
+            if (ifa->ifa_addr == NULL)
+                continue;
+            
+            family = ifa->ifa_addr->sa_family;
+            /* Display interface name and family (including symbolic
+                form of the latter for the common families) */
+            if ((strncmp ("eth", ifa->ifa_name, 3 ) == 0) && family == AF_INET) {
+                s = getnameinfo(ifa->ifa_addr,
+                       (ifa->ifa_addr->sa_family == AF_INET) ? sizeof(struct sockaddr_in) :
+                                             sizeof(struct sockaddr_in6),
+                       host, NI_MAXHOST,
+                       NULL, 0, NI_NUMERICHOST);
+                if (s != 0) {
+                   printf("getnameinfo() failed: %s\n", gai_strerror(s));
+                   exit(EXIT_FAILURE);
+                }
+                printf("%-8s <%s>\n", ifa->ifa_name, host);
+                snprintf ( text_buffer, sizeof(text_buffer), "%s: %s",ifa->ifa_name, host );
+                //ssd1306DrawString(0,  row * 8, text_buffer, 1, WHITE, LAYER0); 
+		lcd_drawText(lcd, 0, row * 8, text_buffer, 255, 255, 255);
+                row++;
+            } 
+            if ((strncmp ("wlan", ifa->ifa_name, 4 ) == 0) && family == AF_INET) {
+                s = getnameinfo(ifa->ifa_addr,
+                       (ifa->ifa_addr->sa_family == AF_INET) ? sizeof(struct sockaddr_in) :
+                                             sizeof(struct sockaddr_in6),
+                       host, NI_MAXHOST,
+                       NULL, 0, NI_NUMERICHOST);
+                if (s != 0) {
+                   printf("getnameinfo() failed: %s\n", gai_strerror(s));
+                   exit(EXIT_FAILURE);
+                }
+                printf("%-8s <%s>\n", ifa->ifa_name, host);
+                snprintf ( text_buffer, sizeof(text_buffer), "%s: %s",ifa->ifa_name, host );
+                //ssd1306DrawString(0,  row * 8, text_buffer, 1, WHITE, LAYER0); 
+		lcd_drawText(lcd, 0, row * 8, text_buffer, 255, 255, 255);
+                row++;
+            } 
+        }
+        freeifaddrs(ifaddr);
+        
+        /* CPU usage
+         * 
+         */
+        float c = GetCPULoad() ;
+        snprintf ( text_buffer, sizeof(text_buffer), "CPU loadavg: %0.2f", c );
+        printf("%s\n", text_buffer);
+        //ssd1306DrawString(0,  row * 8, text_buffer, 1, WHITE, LAYER0); 
+	lcd_drawText(lcd, 0, row * 8, text_buffer, 255, 255, 255);
+        row++;
+        
+        /* Memory usage */
+        float m = GetMemUsage();
+        snprintf ( text_buffer, sizeof(text_buffer), "Mem used: %3.0f%%", m*100 );
+        printf("%s\n", text_buffer);
+        //ssd1306DrawString(4,  2, text_buffer, 1, WHITE, LAYER0); 
+	lcd_drawText(lcd, 4, 2, text_buffer, 255, 255, 255);
+        //ssd1306DrawRect(0, 0, 127, 13, INVERSE, LAYER0);
+        //ssd1306FillRect(2, 2, (int)(123 * m), 9, INVERSE, LAYER0);
+        
+        /* CPU temperature  */
+        int t = GetCPUTemp() ;
+        snprintf ( text_buffer, sizeof(text_buffer), "CPU temp: %3d C", t );
+        printf("%s\n", text_buffer);
+        //ssd1306DrawString(0,  row * 8, text_buffer, 1, WHITE, LAYER0); 
+	lcd_drawText(lcd, 0, row * 8, text_buffer, 255, 255, 255);
+        row++;
+
+        /* Refresh screen */
+        //ssd1306Refresh();
+        //SSD1306MSDELAY(1000);
+	sleep(1);
+    }
+
+
+    //_font = (FONT_INFO*)&ubuntuMono_24ptFontInfo;
+    //ssd1306ClearScreen(LAYER0 | LAYER1) ;
+    //ssd1306Refresh();
+    printf("All done!\r\n");
+    return (EXIT_SUCCESS);
+}
+

meson.build

@@ -1,3 +1,5 @@
 project('dejvino-ST7735', 'c')
-src = ['main.c', 'spilcd_gfx.c', 'spilcd_font.c', 'st7735.c']
-executable('st7735', src, link_args: '-lwiringPi')
+src1 = ['main.c', 'spilcd_gfx.c', 'spilcd_font.c', 'st7735.c']
+src2 = ['example.c', 'spilcd_gfx.c', 'spilcd_font.c', 'st7735.c']
+executable('st7735', src1, link_args: '-lwiringPi')
+executable('example', src2, link_args: '-lwiringPi')