David Smart / Mbed 2 deprecated RA8875_Demo

Simple demo for the Raio RA8875 Based Display with a 4-wire SPI interface.

Dependencies:   mbed RA8875

RA8875 Based Display Controller

This page shows a simple demo program for a graphics library supporting a low cost display from buydisplay.com. While the module can be configured for support via I2C, 3-Wire SPI, 4-Wire SPI, 8-bit Parallel or 16-bit Parallel, the companion library only supports the 4-Wire SPI.

You can also find this display on the Components | RA8875 page.

Library

RA8875 Library

Display Pictures

While this image is sharp, the camera/lighting washed out the colors somewhat. /media/uploads/WiredHome/ra8875display.640x380.png

With careful study of the image below, you can see a number of solder-blob jumpers. These jumpers are described quite well in the manual, and configure the many different options. The specific unit shown here is the "entry point" model, it does not have touchscreen, SD card, extra Font memory, or the key pad interface. As you see in the top left, it is wired with an 8-signal ribbon cable (but note in the schematic that it only needs 6 as the two power and two ground are internally connected together in the module).

/media/uploads/WiredHome/ra8875displaymodulerr.jpg

Also note, that some configuration changes go beyond the jumpers. I decided to switch my configuration to 4-Wire SPI and had to remove R1, R2, and R3 (which were zero-ohm that shorted the SPI input pins to +v!). I also changed some of the solder-blob jumpers, but that was easy. Had I ordered the display with the support for 4-Wire SPI, that would not have been necessary.

Schematic

The library should be able to work with any SPI port, and the Chip Select pin is a simple DigitalOut pin, chosen from the unused pins on my baseboard.

/media/uploads/WiredHome/ra8875_display_schematic.png

Sample Program

#include "mbed.h"
#include "RA8875.h"

Serial pc(USBTX, USBRX);

int main()
{
    pc.baud(460800);    // I like a snappy terminal, so crank it up!
    pc.printf("\r\nRA8875 Test - Build " __DATE__ " " __TIME__ "\r\n");

    RA8875 lcd(p5, p6, p7, p12, NC, "tft");    // MOSI, MISO, SCK, /ChipSelect, /reset, name

    lcd.puts(0,0,
        "RA8875 lcd(p5, p6, p7, p12, NC, \"tft\");\r\n\r\n"
        "lcd.circle(       400,25,  25,  BrightRed);\r\n"
        "lcd.fillcircle(   400,25,  15,  RGB(128,255,128));\r\n"
        "lcd.ellipse(      440,75,  35,20, BrightBlue);\r\n"
        "lcd.fillellipse(  440,75,  25,10, Blue);\r\n"
        "lcd.triangle(     440,100, 475,110, 450,125, Magenta);\r\n"
        "lcd.filltriangle( 445,105, 467,111, 452,120, Cyan);\r\n"
        "lcd.rect(         400,130, 475,155,    Brown);\r\n"
        "lcd.fillrect(     405,135, 470,150,    Pink);\r\n"
        "lcd.roundrect(    410,160, 475,190, 10,8, Yellow);\r\n"
        "lcd.fillroundrect(415,165, 470,185,  5,3, Orange);\r\n"
        "lcd.line(         430,200, 460,230, RGB(0,255,0));\r\n"
        "for (i=0; i<=30; i+=5)\r\n"
        "    lcd.pixel(435+i,200+i, White);");

    lcd.circle(       400,25,  25,               BrightRed);
    lcd.fillcircle(   400,25,  15,               RGB(128,255,128));
    lcd.ellipse(      440,75,  35,20,            BrightBlue);
    lcd.fillellipse(  440,75,  25,10,            Blue);
    lcd.triangle(     440,100, 475,110, 450,125, Magenta);
    lcd.filltriangle( 445,105, 467,111, 452,120, Cyan);
    lcd.rect(         400,130, 475,155,          Brown);
    lcd.fillrect(     405,135, 470,150,          Pink);
    lcd.roundrect(    410,160, 475,190, 10,8,    Yellow);
    lcd.fillroundrect(415,165, 470,185,  5,3,    Orange);
    lcd.line(         430,200, 460,230,          RGB(0,255,0));
    for (i=0; i<=30; i+=5) 
        lcd.pixel(435+i,200+i, White);
    while (1)
        ;
}

main.cpp@6:8e392d0ff74a, 2015-12-17 (annotated)

Committer:
WiredHome
Date:
Thu Dec 17 12:19:37 2015 +0000
Revision:
6:8e392d0ff74a
Parent:
5:bb970d40cd7d
Child:
9:02c622fa4969
Child:
11:2fcc3ee75ebd
Update with test mode disabled.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
WiredHome 0:037b95a5cc85 1 #include "mbed.h"
WiredHome 0:037b95a5cc85 2
WiredHome 0:037b95a5cc85 3 #include "RA8875.h"
WiredHome 5:bb970d40cd7d 4 #include "MyFont18x32.h"
WiredHome 5:bb970d40cd7d 5 #include "BPG_Arial08x08.h"
WiredHome 5:bb970d40cd7d 6 #include "BPG_Arial10x10.h"
WiredHome 5:bb970d40cd7d 7 #include "BPG_Arial20x20.h"
WiredHome 5:bb970d40cd7d 8 #include "BPG_Arial31x32.h"
WiredHome 5:bb970d40cd7d 9 #include "BPG_Arial63x63.h"
WiredHome 0:037b95a5cc85 10
WiredHome 5:bb970d40cd7d 11 LocalFileSystem local("local"); // Because I want <PrintScreen>
WiredHome 5:bb970d40cd7d 12 Serial pc(USBTX, USBRX); // And a little feedback
WiredHome 0:037b95a5cc85 13
WiredHome 0:037b95a5cc85 14 int main()
WiredHome 0:037b95a5cc85 15 {
WiredHome 5:bb970d40cd7d 16 RA8875 lcd(p5, p6, p7, p12, NC, "tft"); // MOSI, MISO, SCK, /ChipSelect, /reset, name
WiredHome 2:2076d9cc6db9 17
WiredHome 5:bb970d40cd7d 18 pc.baud(460800); // I like a snappy terminal, so crank it up!
WiredHome 5:bb970d40cd7d 19 pc.printf("\r\nRA8875 Soft Fonts - Build " __DATE__ " " __TIME__ "\r\n");
WiredHome 2:2076d9cc6db9 20
WiredHome 3:ca6a1026c28e 21 lcd.init();
WiredHome 6:8e392d0ff74a 22
WiredHome 6:8e392d0ff74a 23
WiredHome 6:8e392d0ff74a 24 // **************************
WiredHome 6:8e392d0ff74a 25 //RunTestSet(lcd, pc);
WiredHome 6:8e392d0ff74a 26
WiredHome 6:8e392d0ff74a 27
WiredHome 5:bb970d40cd7d 28 lcd.foreground(BrightBlue);
WiredHome 5:bb970d40cd7d 29 lcd.puts(0,0, "RA8875 Soft Fonts - Build " __DATE__ " " __TIME__ "\r\n");
WiredHome 0:037b95a5cc85 30
WiredHome 5:bb970d40cd7d 31 lcd.SelectUserFont(Dave_Smart18x32);
WiredHome 5:bb970d40cd7d 32 lcd.puts("**** ! Soft Fonts ! **** 0123456789\r\n");
WiredHome 5:bb970d40cd7d 33 lcd.puts("ABCDEFGHIJKLMNOPQRSTUVWXYZ\r\n");
WiredHome 5:bb970d40cd7d 34 lcd.puts("abcdefghijklmnopqrstuvwxyz\r\n");
WiredHome 5:bb970d40cd7d 35 lcd.SelectUserFont();
WiredHome 5:bb970d40cd7d 36 lcd.puts("Back to normal\r\n");
WiredHome 5:bb970d40cd7d 37 lcd.SelectUserFont(BPG_Arial08x08);
WiredHome 5:bb970d40cd7d 38 lcd.puts("BPG_Arial08x08 ABCDEFGHIJKLMNOPQRSTUVWXYZ\r\n");
WiredHome 5:bb970d40cd7d 39 lcd.puts("BPG_Arial08x08 abcdefghijklmnopqrstuvwxyz\r\n");
WiredHome 5:bb970d40cd7d 40 lcd.SelectUserFont(BPG_Arial10x10);
WiredHome 5:bb970d40cd7d 41 lcd.puts("BPG_Arial10x10 ABCDEFGHIJKLMNOPQRSTUVWXYZ\r\n");
WiredHome 5:bb970d40cd7d 42 lcd.puts("BPG_Arial10x10 abcdefghijklmnopqrstuvwxyz\r\n");
WiredHome 5:bb970d40cd7d 43 lcd.SelectUserFont(BPG_Arial20x20);
WiredHome 5:bb970d40cd7d 44 lcd.puts("BPG_Arial20x20 ABCD\r\n");
WiredHome 5:bb970d40cd7d 45 lcd.SelectUserFont(BPG_Arial31x32);
WiredHome 5:bb970d40cd7d 46 lcd.puts("BPG_Arial31x32 ABCD\r\n");
WiredHome 5:bb970d40cd7d 47 lcd.SelectUserFont(BPG_Arial63x63);
WiredHome 5:bb970d40cd7d 48 lcd.puts("BPG_Arial63x63 ABCD\r\n");
WiredHome 5:bb970d40cd7d 49
WiredHome 5:bb970d40cd7d 50 RetCode_t r = lcd.PrintScreen(0,0,480,272,"/local/file.bmp");
WiredHome 5:bb970d40cd7d 51 pc.printf(" PrintScreen returned %d\r\n", r);
WiredHome 3:ca6a1026c28e 52
WiredHome 3:ca6a1026c28e 53 while(1) {
WiredHome 5:bb970d40cd7d 54 ; // end
WiredHome 3:ca6a1026c28e 55 }
WiredHome 0:037b95a5cc85 56 }