added source for lcd project

project10/i2c_1602lcd.c

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+/********************************************************************************************
+*Filename      : i2c1602_lcd.c
+*Description   : test iic 1602 lcd
+*Author        : Alan
+*Website       : www.osoyoo.com
+*Update        : 2017/07/03
+********************************************************************************************/
+#include <stdio.h>
+#include <wiringPi.h>
+#include <wiringPiI2C.h>
+#include <string.h>
+
+int LCDAddr = 0x3f;//IIc LCD address
+int BLEN = 1;//1--open backlight.0--close backlight
+int fd;//linux file descriptor
+
+//writ a word(16 bits) to LCD
+void write_word(int data){
+    int temp = data;
+    if ( BLEN == 1 )
+        temp |= 0x08;
+    else
+        temp &= 0xF7;
+    wiringPiI2CWrite(fd, temp);
+}
+
+//send command to lcd
+void send_command(int comm){
+    int buf;
+    // Send bit7-4 firstly
+    buf = comm & 0xF0;
+    buf |= 0x04;            // RS = 0, RW = 0, EN = 1
+    write_word(buf);
+    delay(2);
+    buf &= 0xFB;            // Make EN = 0
+    write_word(buf);
+
+    // Send bit3-0 secondly
+    buf = (comm & 0x0F) << 4;
+    buf |= 0x04;            // RS = 0, RW = 0, EN = 1
+    write_word(buf);
+    delay(2);
+    buf &= 0xFB;            // Make EN = 0
+    write_word(buf);
+}
+
+//send data to lcd
+void send_data(int data){
+    int buf;
+    // Send bit7-4 firstly
+    buf = data & 0xF0;
+    buf |= 0x05;            // RS = 1, RW = 0, EN = 1
+    write_word(buf);
+    delay(2);
+    buf &= 0xFB;            // Make EN = 0
+    write_word(buf);
+
+    // Send bit3-0 secondly
+    buf = (data & 0x0F) << 4;
+    buf |= 0x05;            // RS = 1, RW = 0, EN = 1
+    write_word(buf);
+    delay(2);
+    buf &= 0xFB;            // Make EN = 0
+    write_word(buf);
+}
+
+//initialize the lcd
+void init(){
+    send_command(0x33); // Must initialize to 8-line mode at first
+    delay(5);
+    send_command(0x32); // Then initialize to 4-line mode
+    delay(5);
+    send_command(0x28); // 2 Lines & 5*7 dots
+    delay(5);
+    send_command(0x0C); // Enable display without cursor
+    delay(5);
+    send_command(0x01); // Clear Screen
+    wiringPiI2CWrite(fd, 0x08);
+}
+
+//clear screen
+void clear(){
+    send_command(0x01); //clear Screen
+}
+
+//Print the message on the lcd
+void write(int x, int y, char data[]){
+    int addr, i;
+    int tmp;
+    if (x < 0)  x = 0;
+    if (x > 15) x = 15;
+    if (y < 0)  y = 0;
+    if (y > 1)  y = 1;
+
+    // Move cursor
+    addr = 0x80 + 0x40 * y + x;
+    send_command(addr);
+
+    tmp = strlen(data);
+    for (i = 0; i < tmp; i++){
+        send_data(data[i]);
+    }
+}
+
+void print_info()
+{
+    printf("\n");
+    printf("|***************************|\n");
+    printf("|    IIC 1602 LCD test      |\n");
+    printf("| --------------------------|\n");
+    printf("| | LCD |            | Pi   |\n");
+    printf("| --------------------------|\n");
+    printf("| | GND | connect to | GND  |\n");
+    printf("| | VCC | connect to | 5V   |\n");
+    printf("| | SDA | connect to | SDA.1|\n");
+    printf("| | SCL | connect to | SCL.1|\n");
+    printf("| --------------------------|\n");
+    printf("|                     OSOYOO|\n");
+    printf("|***************************|\n");
+    printf("Program is running...\n");
+    printf("Press Ctrl+C to end the program\n");
+}
+int main(){
+    //init I2C 
+    fd = wiringPiI2CSetup(LCDAddr);
+    init();
+    print_info();
+    write(0, 0, "Hi man.Welcome ");
+    write(0, 1, "to osoyoo.com");
+    delay(3000);
+    clear();
+    while(1){
+        write(0,0,"This is Lesson13");
+        write(0,1,"IIC LCD Test");
+        delay(1000);
+    }
+    return 0;
+}

project10/makefile

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+
+i2c_1602lcd: i2c_1602lcd.c
+	cc -o i2c_1602lcd i2c_1602lcd.c -lwiringPi
+