LPC1114 + I2c Lcd Mbed. Use LPC1114 microcontroller and I2C Lcd module .
#define lcd_add ((uint8_t) 0x3E<<1)
I2C i2c(dp5, dp27);
void write_lcd(uint8_t reg_adr, uint8_t val){
char cmd[2];
cmd[0] = reg_adr;
cmd[1] = val;
i2c.write(lcd_add, cmd, 2);
wait_us(50);
}
int main() {
i2c.frequency(100000);
//lcd init
write_lcd(0x00,0b00111000);
wait(0.01);
write_lcd(0x00,0b00111001);
wait(0.01);
write_lcd(0x00,0b00010100);
wait(0.01);
write_lcd(0x00,0b01111101);
wait(0.01);
write_lcd(0x00,0b01010110);
wait(0.01);
write_lcd(0x00,0b01101100);
wait(0.01);
write_lcd(0x00,0b00001100);
wait(0.01);
write_lcd(0x00,0b00000001);
wait(0.01);
int i,j=0;
while(1){
char buf[40]=”Hello, Welcome to www.ngolongtech.net”;
for(i=j;i<=strlen(buf);i++){
write_lcd(0x41,buf[i]);
}
j++;
if(j==(strlen(buf)-10)){
j=0;
}
write_lcd(0x00,0b00000010);
wait(0.8);
}
}
Fig.2 I2c Lcd module
Connect Ldc module Vdd to 3.3V (MCU),GND(LCD) to GND(MPU), SDA(LCD) to dp5(MPU) ,SCL(LCD) to dp27(MCU).
Code
#include “mbed.h”
#define lcd_add ((uint8_t) 0x3E<<1)
I2C i2c(dp5, dp27);
void write_lcd(uint8_t reg_adr, uint8_t val){
char cmd[2];
cmd[0] = reg_adr;
cmd[1] = val;
i2c.write(lcd_add, cmd, 2);
wait_us(50);
}
int main() {
i2c.frequency(100000);
//lcd init
write_lcd(0x00,0b00111000);
wait(0.01);
write_lcd(0x00,0b00111001);
wait(0.01);
write_lcd(0x00,0b00010100);
wait(0.01);
write_lcd(0x00,0b01111101);
wait(0.01);
write_lcd(0x00,0b01010110);
wait(0.01);
write_lcd(0x00,0b01101100);
wait(0.01);
write_lcd(0x00,0b00001100);
wait(0.01);
write_lcd(0x00,0b00000001);
wait(0.01);
int i,j=0;
while(1){
char buf[40]=”Hello, Welcome to www.ngolongtech.net”;
for(i=j;i<=strlen(buf);i++){
write_lcd(0x41,buf[i]);
}
j++;
if(j==(strlen(buf)-10)){
j=0;
}
write_lcd(0x00,0b00000010);
wait(0.8);
}
}
