Sergey Frolov / Mbed 2 deprecated Nucleo_LCD_Keypad_Shield

Demo for button and backlight use with Arduino LCD Keypad Shield (HD44780) and similar 16x2 hardware clones. Press 'Up' or 'Down' button to ON or OFF backlight. Build and test with STM32 Nucleo F411RE.

Dependencies:   TextLCD mbed

main.cpp

Committer:
werwolf_lg
Date:
2015-12-23
Revision:
0:8f6ff5bb5a2d

File content as of revision 0:8f6ff5bb5a2d:

#include "mbed.h"
#include "TextLCD.h"

Serial pc(SERIAL_TX, SERIAL_RX); 
AnalogIn button(A0);    // Init button (SELECT, LEFT, UP, DOWN, RIGHT)
// LCD (RS, E, D4, D5, D6, D7);
TextLCD lcd(D8, D9, D4, D5, D6, D7);
PwmOut backlight(D10);  // Backlight LCD
DigitalOut led(LED1);

int main() {
    
    // Set backlight period and duty cycle 
    backlight.period(0.002);
    backlight = 1;
    
    
    lcd.cls();                      // Clear LCD
    lcd.locate(1,0);                // Set locate (1 row, 2 column)
    lcd.printf("LCD Key Shield");
    wait(1);
    
    int meas;
    
    while(1) {
        led = (led == 1) ? 0 : 1;

        meas = button.read() * 1000; // Read the analog input value (value from 0.0 to 1.0) and convert to int value (from 0 to 1000)
        
        lcd.cls();
        lcd.locate(0,0);
        lcd.printf("Press button");
        lcd.locate(0,1);
        
        if (meas < 50) { 
            lcd.printf("BUTTON: Right ");
            backlight = 0.5;        // Set 50% backlight 
        }
        else if (meas < 210) { 
            lcd.printf("BUTTON: Up");
            backlight = 1;          // Power ON backlight
        } 
        else if (meas < 460){ 
            lcd.printf("BUTTON: Down");
            backlight = 0;          // Power OFF backlight
        } 
        else if (meas < 720){ 
            lcd.printf("BUTTON: Left"); 
        } 
        else if (meas > 950){ 
            lcd.printf("BUTTON: Select");
        }
        pc.printf("BUTTON: %4d\n", meas);
        
        wait(0.1);
    }
}