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
main.cpp
- Committer:
- dreschpe
- Date:
- 2014-01-26
- Revision:
- 0:7c3b9bfd6ead
- Child:
- 1:e0479f60cd48
File content as of revision 0:7c3b9bfd6ead:
// 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); }