jun imamura / epd1in54b

Library for Waveshare epd1in54b (1.54 inch ePaper black/red)

Dependents:   epd

e-Paper Module

Description

Waveshare 1.54 e-paper module imported from offiicial code https://www.waveshare.com/wiki/1.54inch_e-Paper_Module_(B) Codes are referenced from official Arduino code and Raspberry pi code.

SPI is used for communication between ePaper module and mbed.

Following shapes can be used:

  • primitive shape (square, circle, line)
  • font (variable sizes)

Pull request are appreciated (Note that the original code is copyrighted by (C) Waveshare )

Example Output

Display output with example code will be like following image: /media/uploads/imachooon/img_20180211_022046.jpg

Example Code

include the mbed library with this snippet

#include "mbed.h"
#include "epd1in54b.h"
// Control
PinName rst;
PinName dc;
PinName busy;
// SPI communication
PinName mosi;
PinName miso;
PinName sclk;
PinName cs;

DigitalOut myled(LED1);

unsigned char frame_black[EPD_HEIGHT*EPD_WIDTH/8];
unsigned char frame_red[EPD_HEIGHT*EPD_WIDTH/8];


int main() {
    mosi = p5;
    miso = p6;
    sclk = p7;
    cs = p8;
    rst = p9;
    dc = p10;
    busy = p11;
    
    memset(frame_black, 0xFF, sizeof(unsigned char)*EPD_HEIGHT*EPD_WIDTH/8);
    memset(frame_red, 0xFF, sizeof(unsigned char)*EPD_HEIGHT*EPD_WIDTH/8);

    Epd epd = Epd(mosi, miso, sclk, cs, dc, rst, busy);
    if (epd.Init() != 0){
        return -1;
    }

    /* Draw something to the frame buffer */
    // For simplicity, the arguments are explicit numerical coordinates
    epd.DrawRectangle(frame_black, 10, 60, 50, 110, COLORED);
    epd.DrawLine(frame_black, 10, 60, 50, 110, COLORED);
    epd.DrawLine(frame_black, 50, 60, 10, 110, COLORED);
    epd.DrawCircle(frame_black, 120, 80, 30, COLORED);
    epd.DrawFilledRectangle(frame_red, 10, 130, 50, 180, COLORED);
    epd.DrawFilledRectangle(frame_red, 0, 6, 200, 26, COLORED);
    epd.DrawFilledCircle(frame_red, 120, 150, 30, COLORED);

    /*Write strings to the buffer */
    epd.DrawStringAt(frame_black, 30, 30, "e-Paper Demo", &Font16, COLORED);
    epd.DrawStringAt(frame_red, 28, 10, "Hello world!", &Font16, UNCOLORED);
    
    // display images
    epd.DisplayFrame(frame_black, frame_red);
    //epd.DisplayFrame(IMAGE_BLACK, IMAGE_RED);
    epd.Sleep();

    
    while(1) {
        myled = 1;
        wait(0.5);
        myled = 0;
        wait(0.5);
    }
}

Diff: epdif.cpp

Revision:
0:cba3c1061231
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/epdif.cpp	Sun Feb 11 01:34:23 2018 +0000
@@ -0,0 +1,73 @@
+/**
+ *  @filename   :   epdif.cpp
+ *  @brief      :   Implements EPD interface functions
+ *                  Users have to implement all the functions in epdif.cpp
+ *  @author     :   Yehui from Waveshare
+ *
+ *  Copyright (C) Waveshare     August 10 2017
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documnetation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to  whom the Software is
+ * furished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "epdif.h"
+EpdIf::EpdIf(){
+    }
+EpdIf::EpdIf(PinName mosi, 
+             PinName miso, 
+             PinName sclk, 
+             PinName cs, 
+             PinName dc, 
+             PinName rst, 
+             PinName busy) {
+    m_spi = new SPI(mosi, miso, sclk);
+    m_cs = new DigitalOut(cs);
+    m_dc = new DigitalOut(dc);
+    m_rst = new DigitalOut(rst);
+    m_busy = new DigitalIn(busy);    
+}
+
+EpdIf::~EpdIf() {
+}
+
+void EpdIf::DigitalWrite(DigitalOut* pout, int value) {
+    *pout = value;
+}
+
+int EpdIf::DigitalRead(DigitalIn* pin) {
+    int ret = *pin;
+    return ret;
+}
+
+void EpdIf::DelayMs(unsigned int delaytime) {
+    wait_ms(delaytime);
+}
+
+void EpdIf::SpiTransfer(unsigned char data) {
+    *m_cs = 0;
+    m_spi->write(data);
+    *m_cs = 1;
+}
+
+int EpdIf::IfInit(void){
+    m_spi->format(8,0); 
+    m_spi->frequency(2000000); 
+    return 0;
+}
+    
+