![](/media/cache/group/ox_brand_cmyk_rev.png.50x50_q85.jpg)
This is a simple program using the Mikroelectronika TFT resistive touchscreen to create a sketchpad application.
Dependencies: SPI_TFT_ILI9341 TFT_fonts mbed
Fork of TFT_Mikroelectronika_IL9341 by
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
Revision 7:c2bc477a07da, committed 2016-06-15
- Comitter:
- cstevens
- Date:
- Wed Jun 15 09:00:27 2016 +0000
- Parent:
- 6:18c7288b5e00
- Commit message:
- working versin with a few problems - mostly that the touch identification routine is still not 10% accurATE at telling when an actual touch has occurred.. random noise on the adcs tends to make the occasional spot apear.; fix for thi would be to detec
Changed in this revision
main.cpp | Show annotated file Show diff for this revision Revisions of this file |
diff -r 18c7288b5e00 -r c2bc477a07da main.cpp --- a/main.cpp Tue Jun 14 11:01:24 2016 +0000 +++ b/main.cpp Wed Jun 15 09:00:27 2016 +0000 @@ -25,15 +25,17 @@ //NB better combination to use a coherent 2x4 block for lcd // SPI_TFT_ILI9341 TFT(PTD2, PTD3, PTD1, PTA16, PTA17, PTC16,"TFT"); // mosi, miso, sclk, cs, reset, dc for frdmkl25z // DigitalOut LCD_LED(PTC17); - +int touching=0; // Subroutine to read the x location of the touch point // need to set x+ to 3V and ground x- then read analogue voltage on ym //nb need to add a check for actual touch as opposed to random crap int readX() { - AnalogIn yp(PTB2); - AnalogIn ym(PTB3); + int delta=0,xv1=0,xv2=0,k=0; + + AnalogIn yp(PTB3); + AnalogIn ym(PTB2); DigitalOut xp(PTB0); DigitalOut xm(PTB1); @@ -42,14 +44,23 @@ // dont need to do anyhting to set low side as it should be fine. // but do need to disconnect yp //yp.PinMode(PullNone) - int xval=(int)ym.read_u16(); // get value - return(xval); + for(k=0; k<10; k++) { // make 10 readings to average + xv1+=(int)ym.read_u16(); // get value + xv2+=(int)yp.read_u16(); // get other value + } + delta=abs(xv2-xv1)/10; + if(delta<300) touching=1; + else touching=0; + pc.printf("delta=%d \t %d\n\r",delta,touching); + xp=0; + xm=0; + return(xv2/10); //maybe better to return the average of both.... } // subroutine to read y values - has different pin functions .. int readY() { - DigitalOut yp(PTB2); - DigitalOut ym(PTB3); + DigitalOut yp(PTB3); + DigitalOut ym(PTB2); AnalogIn xp(PTB0); AnalogIn xm(PTB1); @@ -59,16 +70,35 @@ // but do need to disconnect yp //yp.PinMode(PullNone) int yval=(int)xm.read_u16(); // get value + + yp=0; + ym=0; return(yval); + } +void drawbuttons() +{ + TFT.fillrect(0,0,50,50,Red); + TFT.fillrect(50,0,100,50,Green); + TFT.fillrect(100,0,150,50,Blue); + TFT.fillrect(150,0,200,50,White); + TFT.fillrect(200,0,240,50,Black); + + TFT.rect(0,0,50,50,White); + TFT.rect(50,0,100,50,White); + TFT.rect(100,0,150,50,White); + TFT.rect(150,0,200,50,White); + TFT.rect(200,0,240,50,White); + +} int main() { pc.baud(115200); - - int xpos=0,ypos=0,xp=0,yp=0; + int color=0; + int xpos=0,ypos=0,xp=0,yp=0,sw=0;; pwr=1; wait(0.2); @@ -102,25 +132,60 @@ TFT.set_font((unsigned char*) Arial24x23); TFT.locate(50,100); TFT.printf("TFT orientation 3"); - TFT.set_orientation(1); + TFT.set_orientation(0); + for(i=0; i<10; i++) { - wait(1); // wait one seconds + wait(0.2); // wait one seconds TFT.locate(50,160); TFT.printf("count %d",i); } - TFT.set_orientation(1); + TFT.set_orientation(0); TFT.cls(); // LCD_LED = 1; - TFT.circle(120,120,10,0xffff); + //cornwer markers + //TFT.fillcircle(10,10,5,0xffff); + //TFT.fillcircle(230,10,5,0xffff); + //TFT.fillcircle(230,310,5,0xffff); + //TFT.fillcircle(10,310,5,0xffff); + drawbuttons(); while(1==1) { xpos=readX(); ypos=readY(); - pc.printf("xpos=%d\t,\typo=%d",xpos,ypos); - xp=(240*xpos)/60000; - yp=(320*ypos)/60000; - pc.printf("\txp=%d\t,\typo=%d\n\r",xp,yp); - if(xp>5 && yp>5) TFT.circle(xp,yp,5,Yellow); + // top chunk of the screen is the button area // + // 0<y<50 is palette area // + + //pc.printf("xpos=%d\t,\typo=%d",xpos,ypos); + xp=(240*(xpos-5800))/51200; + yp=320-(320*(ypos-3000))/58300; + if(touching==1) pc.printf("\txp=%d\t,\typo=%d\n\r",xp,yp); + if(xp>5 && yp>50 && touching==1) TFT.fillcircle(xp,yp,2,color); + if(yp<50) { // color buttons + sw=(int)xp/50; + switch(sw) { + case 0: + color=0xf800; + break; + case 1: + color=0x07e0; + break; + case 2: + color=0x001f; + break; + case 3: + color=0xffff; + break; + case 4: + color=0x0000; + TFT.cls(); + drawbuttons(); + break; + } + // if(xp<50) color=0xF800; + // if(50<xp && xp<100) color=0x07e0; + // if(xp>100 && xp<150) color=0x001f; + } + wait(0.1); }