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@0:8f6ff5bb5a2d, 2015-12-23 (annotated)

Committer:
werwolf_lg
Date:
Wed Dec 23 16:58:19 2015 +0000
Revision:
0:8f6ff5bb5a2d
First version demo for Arduino LCD Keypad Shield and STM32 Nucleo

Who changed what in which revision?

UserRevisionLine numberNew contents of line
werwolf_lg 0:8f6ff5bb5a2d 1 #include "mbed.h"
werwolf_lg 0:8f6ff5bb5a2d 2 #include "TextLCD.h"
werwolf_lg 0:8f6ff5bb5a2d 3
werwolf_lg 0:8f6ff5bb5a2d 4 Serial pc(SERIAL_TX, SERIAL_RX);
werwolf_lg 0:8f6ff5bb5a2d 5 AnalogIn button(A0); // Init button (SELECT, LEFT, UP, DOWN, RIGHT)
werwolf_lg 0:8f6ff5bb5a2d 6 // LCD (RS, E, D4, D5, D6, D7);
werwolf_lg 0:8f6ff5bb5a2d 7 TextLCD lcd(D8, D9, D4, D5, D6, D7);
werwolf_lg 0:8f6ff5bb5a2d 8 PwmOut backlight(D10); // Backlight LCD
werwolf_lg 0:8f6ff5bb5a2d 9 DigitalOut led(LED1);
werwolf_lg 0:8f6ff5bb5a2d 10
werwolf_lg 0:8f6ff5bb5a2d 11 int main() {
werwolf_lg 0:8f6ff5bb5a2d 12
werwolf_lg 0:8f6ff5bb5a2d 13 // Set backlight period and duty cycle
werwolf_lg 0:8f6ff5bb5a2d 14 backlight.period(0.002);
werwolf_lg 0:8f6ff5bb5a2d 15 backlight = 1;
werwolf_lg 0:8f6ff5bb5a2d 16
werwolf_lg 0:8f6ff5bb5a2d 17
werwolf_lg 0:8f6ff5bb5a2d 18 lcd.cls(); // Clear LCD
werwolf_lg 0:8f6ff5bb5a2d 19 lcd.locate(1,0); // Set locate (1 row, 2 column)
werwolf_lg 0:8f6ff5bb5a2d 20 lcd.printf("LCD Key Shield");
werwolf_lg 0:8f6ff5bb5a2d 21 wait(1);
werwolf_lg 0:8f6ff5bb5a2d 22
werwolf_lg 0:8f6ff5bb5a2d 23 int meas;
werwolf_lg 0:8f6ff5bb5a2d 24
werwolf_lg 0:8f6ff5bb5a2d 25 while(1) {
werwolf_lg 0:8f6ff5bb5a2d 26 led = (led == 1) ? 0 : 1;
werwolf_lg 0:8f6ff5bb5a2d 27
werwolf_lg 0:8f6ff5bb5a2d 28 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)
werwolf_lg 0:8f6ff5bb5a2d 29
werwolf_lg 0:8f6ff5bb5a2d 30 lcd.cls();
werwolf_lg 0:8f6ff5bb5a2d 31 lcd.locate(0,0);
werwolf_lg 0:8f6ff5bb5a2d 32 lcd.printf("Press button");
werwolf_lg 0:8f6ff5bb5a2d 33 lcd.locate(0,1);
werwolf_lg 0:8f6ff5bb5a2d 34
werwolf_lg 0:8f6ff5bb5a2d 35 if (meas < 50) {
werwolf_lg 0:8f6ff5bb5a2d 36 lcd.printf("BUTTON: Right ");
werwolf_lg 0:8f6ff5bb5a2d 37 backlight = 0.5; // Set 50% backlight
werwolf_lg 0:8f6ff5bb5a2d 38 }
werwolf_lg 0:8f6ff5bb5a2d 39 else if (meas < 210) {
werwolf_lg 0:8f6ff5bb5a2d 40 lcd.printf("BUTTON: Up");
werwolf_lg 0:8f6ff5bb5a2d 41 backlight = 1; // Power ON backlight
werwolf_lg 0:8f6ff5bb5a2d 42 }
werwolf_lg 0:8f6ff5bb5a2d 43 else if (meas < 460){
werwolf_lg 0:8f6ff5bb5a2d 44 lcd.printf("BUTTON: Down");
werwolf_lg 0:8f6ff5bb5a2d 45 backlight = 0; // Power OFF backlight
werwolf_lg 0:8f6ff5bb5a2d 46 }
werwolf_lg 0:8f6ff5bb5a2d 47 else if (meas < 720){
werwolf_lg 0:8f6ff5bb5a2d 48 lcd.printf("BUTTON: Left");
werwolf_lg 0:8f6ff5bb5a2d 49 }
werwolf_lg 0:8f6ff5bb5a2d 50 else if (meas > 950){
werwolf_lg 0:8f6ff5bb5a2d 51 lcd.printf("BUTTON: Select");
werwolf_lg 0:8f6ff5bb5a2d 52 }
werwolf_lg 0:8f6ff5bb5a2d 53 pc.printf("BUTTON: %4d\n", meas);
werwolf_lg 0:8f6ff5bb5a2d 54
werwolf_lg 0:8f6ff5bb5a2d 55 wait(0.1);
werwolf_lg 0:8f6ff5bb5a2d 56 }
werwolf_lg 0:8f6ff5bb5a2d 57 }