ILI9341

CelticLord · 2016-04-09 23:51

I have two boards withh the 9341 graphics controller.
The First works fine,
http://www.elecfreaks.com/store/24-tft-lcd-tft0124sp-p-785.html
but the newest one from Adafruit
https://www.adafruit.com/products/2090
does not work with the driver (Mark Tillotson) http://obex.parallax.com/search/ili9341
Can anyone resolve this, or have an updated driver?

CelticLord · 2016-04-19 19:24

Been through anything I can think of and don't see why the driver should not work?
1. Same graphics chip ILI9341
2. same communication methoud (SPI)
3. All pins connected and referenced correct when initialized.
4. Backlight biased and bright but blank.

CelticLord · 2016-06-13 17:50

All working Fine!
Problem was no literature with Product. Found on Adafruit site.
Pads IM1 IM2 IM3 need to be soldered for SPI
All I need to do now is get the I2C for touch screen woring, don't know what the device address would be. Tryed going through all 128 (0 - 127) addresses with no luck. There are no address pins to set on the board. Has to be 0 and the I2C (jm_i2c.spin) http://obex.parallax.com/object/311 driver needs to be tweek some way or other. Any help?

Mark_T · 2016-06-14 15:44

Ah, glad its working now - TFT grief is not fun, I know.

CelticLord · 2016-06-14 21:10

Got any ideas on getting the I2C for the touch screen working.
Using (jm_i2c.spin) http://obex.parallax.com/object/311 driver
The touch screen has IRQ / SCL / SDA as you know.
IRQ goes low when screen touched to signal valid touch (Works),
but when it goes to I2C section of my code (Spin) to execute I2c read x(4) and y(6) addresses it locks up there. Tried all 128 (0 - 127) possible id for the touch screen chip http://www.buydisplay.com/download/ic/FT6206.pdf.
So I think, and im no expert with I2C, its the I2c code needs tweeked to run the clk at 10 - 400khz per data sheet. How I do not know.
Help Apreciated

78rpm · 2016-06-14 23:20

CelticLord wrote: »

Got any ideas on getting the I2C for the touch screen working.
Using (jm_i2c.spin) http://obex.parallax.com/object/311 driver
The touch screen has IRQ / SCL / SDA as you know.
IRQ goes low when screen touched to signal valid touch (Works),
but when it goes to I2C section of my code (Spin) to execute I2c read x(4) and y(6) addresses it locks up there. Tried all 128 (0 - 127) possible id for the touch screen chip http://www.buydisplay.com/download/ic/FT6206.pdf.
So I think, and im no expert with I2C, its the I2c code needs tweeked to run the clk at 10 - 400khz per data sheet. How I do not know.
Help Apreciated

Snippet from Adafruit page:

The capacitive touch screen controller communicates over I2C, which uses two hardwire pins. However, you can share these pins with other sensors and displays as long as they don't conflict with I2C address 0x38.

https://learn.adafruit.com/adafruit-2-dot-8-color-tft-touchscreen-breakout-v2/capacitive-touchscreen

CelticLord · 2016-06-16 21:53

Need help to fix code it just hangs when it goes to subroutine Touch after it beep the piezo speaker. Graphics work but dose not display due to hanging up in Touch.
It is not my code directly but how im trying to use the I2C by Johhny Mac. What am I doing wrong!

CON
  _clkmode = xtal1 + pll16x  'Standard clock mode * crystal frequency = 80 MHz
  _CLKFREQ = 80_000_000

  '*************************************
  '**  glcdlay 2.8TFTLCDCAPTOUCH SPI  **
  '*************************************
  ' SD Card     SPI
  _dopin   = 23 ' MISO      
  _clkpin  = 25 ' CLK         
  _dipin   = 21 ' MOSI    
  _cspin   = 7  ' CS              
  _cdpin   = -1 ' -1 if unused.
  _wppin   = -1 ' -1 if unused.
  _rtcres1 = -1 ' -1 always.
  _rtcres2 = -1 ' -1 always.  
  _rtcres3 = -1 ' -1 always.

  ' LCD         SPI
  nRESET   = 15 ' Reset 
  RS       = 17 ' D/C      
  nCS      = 19 ' CS      
  MOSI     = 21 ' MOSI    
  SCLK     = 25 ' CLK     
  MISO     = 23 ' MISO    


  'Touch Screen I2C
  TSDA     = 4   ' SDA
  TSCL     = 6   ' SCL
  TIRQ     = 12  ' IRQ
  TSAD     = 0   ' I2C Address

  'Speaker
  Spkr   =  0

OBJ
  ASE         : "ASCII_STREngine"
  sd          : "MicroSD"
  glcd        : "ILI9341-spi"
  TS          : "I2C" 

VAR
  Byte Button, tsByte, iLoop, bBeeps, bSpkrOn, bSpkrOff

Main
    '*********************************
    '**     INITIALIZE SPEAKER      **
    '*********************************
    DIRA[Spkr] := 1
 
   '*********************************
   '**       INITIALIZE  I2C       **
   '*********************************
  TS.setupx(TSCL, TSDA)
      
  '*********************************
  '**     INITIALIZE KEYBOARD     **
  '*********************************
  DIRA[TIRQ] := 0

  Repeat
    '****************************
    '**        KeyBoard        **
    '****************************

    Repeat iLoop from 1 to 50
      Button := ina[TIRQ]
      if Button == 0  
        Touch


PUB Touch
  Beep 
  tsByte := TS.rd_byte(TSAD, $04)
  glcd.DrawStringSmall (16,96,ASE.integerToDecimal(tsByte,3))  

Pub Beep
  '**************************
  '**         Beep         **
  '**************************
  Repeat bBeeps from 1 to 50
    outa[Spkr] := 1
    repeat bSpkrOn from 1 to 100
    outa[Spkr] := 0
    repeat bSpkrOff from 1 to 10

78rpm · 2016-06-17 00:14

This piece of code:

'Touch Screen I2C
  TSDA     = 4   ' SDA
  TSCL     = 6   ' SCL
  TIRQ     = 12  ' IRQ
  TSAD     = 0   ' I2C Address

TSAD should be $38, ie hexadecimal, according to the Adafruit snippet I posted.

Do you have or need a pullup on SDA ?
SCL and IRQ will not need them.

CelticLord · 2016-06-17 17:12

TSAD was set to $38 before, but I just reset it to $38
1. Yes I have a 10K pullup on SDA
Have also tried a 1K. Dont have 4.7k to use
2. All connections are correct
Graphics card funtions just not when it gets to the TOUCH routine because it dose not process the I2C when it hangs in it.
I know it hangs because the clock routine is not updated due to it not returning from TOUCH
3. It is going to touch because I have an audio beep there.

Same result it hangs in Touchs I2C code

ILI9341

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