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1.  使用mbed控制lcd的代码和arduino非常相似。

下面是arduino的代码。

// include the library code:

#include <LiquidCrystal.h>

// initialize the library by associating any needed LCD interface pin

// with the arduino pin number it is connected to

const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;

//LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

void setup() {

  // set up the LCD's number of columns and rows:

  lcd.begin(16, 2);

  // Print a message to the LCD.

  lcd.print("hello, world!");

}

void loop() {

  // set the cursor to column 0, line 1

  // (note: line 1 is the second row, since counting begins with 0):

  lcd.setCursor(0, 1);

  // print the number of seconds since reset:

  lcd.print(millis() / 1000);

}

2.  同时如下为mbed的代码。

#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);

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;

        while(1) {

    lcd.cls();                      // Clear LCD

    lcd.locate(1,0);                // Set locate (1 row, 2 column)

    lcd.printf("LCD Key Shield");

    wait(1);

  }   

}

编译后的文件

Downloads.rar

3. 代码编辑如图，

4. 引脚的连接方式是，其中lcd偏置电阻在1k-5k之间，调整VL的电压。背光电源A-K也要连接对正反方向。

显示后效果如下，

因为背光调整原因，显示还有些问题，继续调整。