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Simple demo for the Raio RA8875 Based Display with a 4-wire SPI interface.
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
Display Pictures
While this image is sharp, the camera/lighting washed out the colors somewhat.
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).
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.
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
- Committer:
- WiredHome
- Date:
- 2014-12-28
- Revision:
- 3:ca6a1026c28e
- Parent:
- 2:2076d9cc6db9
- Child:
- 5:bb970d40cd7d
- Child:
- 7:1002bb8871c0
File content as of revision 3:ca6a1026c28e:
#include "mbed.h" #include "RA8875.h" Serial pc(USBTX, USBRX); int main() { int i; Timer t; float f = 10000000; pc.baud(460800); // I like a snappy terminal, so crank it up! pc.printf("\r\nRA8875 Test - Build " __DATE__ " " __TIME__ "\r\n"); pc.printf("Turning on display\r\n"); RA8875 lcd(p5, p6, p7, p12, NC, "tft"); // MOSI, MISO, SCK, /ChipSelect, /reset, name t.start(); lcd.init(); lcd.frequency(f); lcd.cls(); wait_ms(250); uint32_t tStart = t.read_us(); lcd.puts(0,0, "RA8875 lcd(p5, p6, p7, p12, NC, \"tft\");\r\n" "lcd.init(true, 480,272,16);\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); uint32_t tEnd = t.read_us(); pc.printf("@ %4.2f MHz, elapsed time is %u usec.\r\n", (float)f/1000000, tEnd-tStart); lcd.KeypadInit(); while(1) { while(!lcd.readable()) ; if (lcd.readable()) { int k = lcd.getc(); pc.printf("key: %02X \r\n", k); } wait_ms(50); } }