Major Update

C/Makefile

@@ -1,12 +1,14 @@
-Target = display
-CXX = gcc
-ODIR = obj
-SRC =$(wildcard *.c)
-DIR =$(notdir $(SRC))
-OBJ = $(patsubst %.c, %.o, $(DIR))
+Target = display
+CFLAGS = -Wall
+CXX = gcc
+LIBS = 
+ODIR = obj
+SRC = $(wildcard *.c)
+DIR = $(notdir $(SRC))
+OBJ = $(patsubst %.c, %.o, $(DIR))
 $(Target): $(OBJ)
- $(CXX) $^ -o $@ -g -rdynamic 
-.PHONY:clean
+ $(CXX) $^ -o $@ $(LIBS)
+.PHONY: clean
 clean:
  rm -rf *.o
  rm -rf $(Target)

C/display.c

@@ -1,35 +1,50 @@
-/******
-Demo for ssd1306 i2c driver for Raspberry Pi 
-******/
-#include <stdio.h>
-#include "ssd1306_i2c.h"
-#include "time.h"
-#include <unistd.h>
+/*********************************************************************
+ * Demo for SSD1306 I2C driver for Raspberry Pi
+ *********************************************************************/
 
+#include <signal.h>
+#include <stdlib.h> // exit
+#include <unistd.h> // sleep, usleep
+#include "ssd1306_i2c.h" // LCD_Display, ssd1306_begin
 
+void sig_handler(int signum) // Return type of the handler function should be void
+{
+ switch (signum)
+ {
+ case SIGHUP:
+ OLED_Clear();
+ exit(0);
+ case SIGINT:
+ OLED_Clear();
+ exit(0);
+ case SIGTERM:
+ OLED_Clear();
+ exit(0);
+ default:
+ break;
+ }
+}
 
-int main(void) 
+int main(void)
 {
- unsigned char symbol=0;
- ssd1306_begin(SSD1306_SWITCHCAPVCC, SSD1306_I2C_ADDRESS); //LCD Screen initialization
- if(i2cd<0)
- {
- printf("I2C device failed to open\r\n");
- return 0;
- }
- usleep(150*1000); //Short delay Ensure the normal response of the lower function
- FirstGetIpAddress(); //Get IP address
- while(1)
+ unsigned short int count = 0;
+
+ signal(SIGHUP, sig_handler); // Register signal handler (can't catch SIGKILL or SIGSTOP)
+ signal(SIGINT, sig_handler); // Register signal handler (can't catch SIGKILL or SIGSTOP)
+ signal(SIGTERM, sig_handler); // Register signal handler (can't catch SIGKILL or SIGSTOP)
+
+ ssd1306_begin(SSD1306_SWITCHCAPVCC, SSD1306_I2C_ADDRESS); // LCD Screen initialization
+ usleep(150000); // Short delay to ensure the normal response of the lower functions
+
+ // Loop forever
+ for (;;)
+ {
+ LCD_Display(count);
+ sleep(1);
+ count++;
+ if (count > 2)
  {
- LCD_Display(symbol);
- sleep(1);
- sleep(1);
- sleep(1);
- symbol++;
- if(symbol==3)
- {
- symbol=0;
- }
+ count = 0;
  }
-  return 0;
+ }
 }