【STM32 Mbed帖子大集合】

一个基础的 LCD显示测试, 原程序基于NXP LPC1768\'s
SPI 接口显示点阵,字符,数字基于 Nokia 5110 ,Nokia 3310 LCD
其控制器为 PCD8544



//平台nucleo 070r+mbed+Nokia5110 SPI屏幕
//
/*  1. RST ——复位
  2. CE  —— 片选
  3. DC  —— 数据/指令选择
  4. DIN —— 串行数据线
  5. CLK —— 串行时钟线
  6. VCC —— 电源输入（3.3v和5v均可，经过实验验证，没有问题）
  7. BL  ——  背光控制端
  8. GND —— 地线

接口为串行SPI接口
*/
#include "mbed.h"
#include "N5110.h"
//      VCC,SCE,RST,D/C,MOSI,SCLK,LED
N5110 lcd(D8,D9,D10,D11,D12,D13,D14);
//N5110 lcd VCC,SCE,RST,D/C,MOSI,SCLK,LED:  p7,p8,p9,p10,p11,p13,p21
//原程序基于xbed LPC1768      
// Can also power (VCC) directly from VOUT (3.3 V) -
// Can give better performance due to current limitation from GPIO pin

int main()
{
    // first need to initialise display
    lcd.init();

    while(1) {

        // these are default settings so not strictly needed
        lcd.normalMode();      // normal colour mode
        lcd.setBrightness(0.5); // put LED backlight on 50%

        // can directly print strings at specified co-ordinates
        lcd.printString("Hello, World!",0,0);

        char buffer[14];  // each character is 6 pixels wide, screen is 84 pixels (84/6 = 14)
        // so can display a string of a maximum 14 characters in length
        // or create formatted strings - ensure they aren't more than 14 characters long
        int temperature = 27;
        int length = sprintf(buffer,"T = %2d C",temperature); // print formatted data to buffer
        // it is important the format specifier ensures the length will fit in the buffer
        if (length <= 14)  // if string will fit on display
            lcd.printString(buffer,0,1);           // display on screen

        float pressure = 1012.3;  // same idea with floats
        length = sprintf(buffer,"P = %.2f mb",pressure);
        if (length <= 14)
            lcd.printString(buffer,0,2);

        // can also print individual characters at specified place
        lcd.printChar('X',5,3);

        // draw a line across the display at y = 40 pixels (origin top-left)
        for (int i = 0; i < WIDTH; i++) {
            lcd.setPixel(i,40);
        }
        // need to refresh display after setting pixels
        lcd.refresh();

        // can also check status of pixels using getPixel(x,y)

        wait(5.0);
        lcd.clear();            // clear display
        lcd.inverseMode();      // invert colours
        lcd.setBrightness(1.0); // put LED backlight on full

        float array[84];

        for (int i = 0; i < 84; i++) {
            array = 0.5 + 0.5*sin(i*2*3.14/84);
        }

        // can also plot graphs - 84 elements only
        // values must be in range 0.0 - 1.0
        lcd.plotArray(array);
        wait(5.0);
        lcd.clear();
        lcd.normalMode();      // normal colour mode back
        lcd.setBrightness(0.5); // put LED backlight on 50%

        // example of drawing lines
        for (int x = 0; x < WIDTH ; x+=10) {
            // x0,y0,x1,y1,type 0-white,1-black,2-dotted
            lcd.drawLine(0,0,x,HEIGHT,2);
        }
        lcd.refresh();   // need to refresh screen after drawing lines

        wait(5.0);
        lcd.clear();

        // example of how to draw circles
        lcd.drawCircle(WIDTH/2,HEIGHT/2,20,1);  // x,y,radius,black fill
        lcd.drawCircle(WIDTH/2,HEIGHT/2,10,2);  // x,y,radius,white fill
        lcd.drawCircle(WIDTH/2,HEIGHT/2,30,0);  // x,y,radius,transparent with outline
        lcd.refresh();   // need to refresh screen after drawing circles

        wait(5.0);
        lcd.clear();
        // example of how to draw rectangles
        //          origin x,y,width,height,type
        lcd.drawRect(10,10,50,30,1);  // filled black rectangle
        lcd.drawRect(15,15,20,10,2);  // filled white rectange (no outline)
        lcd.drawRect(2,2,70,40,0);    // transparent, just outline
        lcd.refresh();   // need to refresh screen after drawing rects

        wait(5.0);
        lcd.clear();
    }
}

另一种5110屏幕模块采用SPI接口，模块总共有8个引脚，接法如下：

  1. RST ====>复位
  2. CE  ====>片选
  3. DC  ====>数据/指令选择
  4. DIN ====>串行数据线
  5. CLK ====>串行时钟线
  6. VCC ====>电源输入（3.3v和5v均可）
  7. BL  ====>背光控制端
  8. GND ====>地线

谢楼主分享

感谢楼主分享，非常详细啊。

谢谢分享

谢谢楼主分享

谢谢分享啊。