This is a simple program using the Mikroelectronika TFT resistive touchscreen to create a sketchpad application.
Dependencies: SPI_TFT_ILI9341 TFT_fonts mbed
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Code to make a simple sketchpad using the touchscreen from Mikroelectronika
The Mikroelectronika touch screen is a good sized display we are using for the first time in 2016. It's got a touch panel layer and can be addressed by either SPI or parallel buses.
http://www.mikroe.com/add-on-boards/display/tft-proto/
Pin connections for use with an mbed
Referring to the pin names on the screen pcb
Pins:
Screen | mbed name | KL25Z example |
---|---|---|
sdi | mosi | PTD2 |
sdo | miso | PTD3 |
rs | sck | PTD1 |
RD | GND | GND |
IM0 | GND | GND |
IM1 | 3.3V | 3V3 |
IM2 | 3.3V | 3V3 |
IM3 | 3.3V | 3V3 |
CS | digitalout pin | PTD5 |
RST | digitaloutpin | PTD0 |
WR | digitaloutpin | PTA13 |
You will need 2 wires to drive the backlight on leda and ledk (anode(connect to +V via a current limiting resistor) and cathode) Link +3.3V to IM1, IM2, IM3 to setup spi communication mode link
Diff: main.cpp
- Revision:
- 0:7c3b9bfd6ead
- Child:
- 1:e0479f60cd48
diff -r 000000000000 -r 7c3b9bfd6ead main.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Sun Jan 26 20:55:50 2014 +0000 @@ -0,0 +1,138 @@ +// example to test the TFT Display from banggood.com +// Thanks to the GraphicsDisplay and TextDisplay classes +// test.bmp has to be on the mbed file system +// and on the sd-card + +#include "stdio.h" +#include "mbed.h" +#include "SPI_TFT_ILI9341.h" +#include "string" +#include "Arial12x12.h" +#include "Arial24x23.h" +#include "Arial28x28.h" +#include "font_big.h" +#include "SDFileSystem.h" + +// the SD-connector is connected to SPI pin 11-13 +SDFileSystem sd(p11, p12, p13, p14, "sd"); // mosi,miso,sck,cs + +LocalFileSystem local("local"); + +extern unsigned char p1[]; // the mbed logo graphic + +// the display has a backlight switch on board +DigitalOut LCD_LED(p21); + +// the TFT is connected to SPI pin 5-7 +SPI_TFT_ILI9341 TFT(p5, p6, p7, p8, p9, p10,"TFT"); // mosi, miso, sclk, cs, reset, dc + +int main() +{ + int i; + LCD_LED = 1; // backlite on + + TFT.claim(stdout); // send stdout to the TFT display + TFT.set_orientation(1); + TFT.background(Black); // set background to black + TFT.foreground(White); // set chars to white + TFT.cls(); // clear the screen + + //first show the 4 directions + TFT.set_orientation(0); + TFT.background(Black); + TFT.cls(); + + TFT.set_font((unsigned char*) Arial12x12); + TFT.locate(0,0); + printf(" Hello Mbed 0"); + TFT.set_orientation(1); + TFT.locate(0,0); + printf(" Hello Mbed 1"); + TFT.set_orientation(2); + TFT.locate(0,0); + printf(" Hello Mbed 2"); + TFT.set_orientation(3); + TFT.locate(0,0); + printf(" Hello Mbed 3"); + TFT.set_orientation(1); + TFT.set_font((unsigned char*) Arial24x23); + TFT.locate(50,100); + TFT.printf("TFT orientation"); + + wait(5); // wait two seconds + + // draw some graphics + TFT.cls(); + TFT.set_font((unsigned char*) Arial24x23); + TFT.locate(100,100); + TFT.printf("Graphic"); + + TFT.line(0,0,100,0,Green); + TFT.line(0,0,0,200,Green); + TFT.line(0,0,100,200,Green); + + TFT.rect(100,50,150,100,Red); + TFT.fillrect(180,25,220,70,Blue); + + TFT.circle(80,150,33,White); + TFT.fillcircle(160,190,20,Yellow); + + double s; + + for (i=0; i<320; i++) { + s =20 * sin((long double) i / 10 ); + TFT.pixel(i,100 + (int)s ,Red); + } + + + wait(5); // wait two seconds + + // bigger text + TFT.foreground(White); + TFT.background(Blue); + TFT.cls(); + TFT.set_font((unsigned char*) Arial24x23); + TFT.locate(0,0); + TFT.printf("Different Fonts :"); + + TFT.set_font((unsigned char*) Neu42x35); + TFT.locate(10,30); + TFT.printf("Hello Mbed 1"); + TFT.set_font((unsigned char*) Arial24x23); + TFT.locate(20,80); + TFT.printf("Hello Mbed 2"); + TFT.set_font((unsigned char*) Arial12x12); + TFT.locate(35,120); + TFT.printf("Hello Mbed 3"); + wait(5); + + TFT.background(Black); + TFT.cls(); + TFT.locate(10,10); + TFT.printf("Graphic from Flash"); + + // mbed logo + // defined in graphics.c + //__align(4) + //unsigned char p1[18920] = { + //0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, .... + // + TFT.Bitmap(90,90,172,55,p1); + + wait(5); + TFT.cls(); + + // to compare the speed of the internal file system and a SD-card + TFT.locate(10,10); + TFT.printf("Graphic from internal File System"); + TFT.locate(10,20); + TFT.printf("open test.bmp"); + int err = TFT.BMP_16(1,50,"/local/test.bmp"); + if (err != 1) TFT.printf(" - Err: %d",err); + + TFT.locate(10,110); + TFT.printf("Graphic from external SD-card"); + TFT.locate(10,120); + err = TFT.BMP_16(1,140,"/sd/test.bmp"); + if (err != 1) TFT.printf(" - Err: %d",err); +}