reset issue

[russli]

I encountered an issue using the graphicstest sketch with an ILI9341 controller.

If readID() is called directly after reset() ( as the graphicstest sketch does )
the ILI9341 does not have enough time to properly reset before readID() is called.
In my case this caused an erroneous id of: 0xC0C0 to be reported.
Adding a delay of 2 ms. between readID() and reset() resolves this issue.

Rather than modifying each sketch, a better solution would of course be to add the
delay to the reset() function within Adafruit_TFTLCD.cpp as follows:

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

void Adafruit_TFTLCD::reset(void) {

CS_IDLE;
// CD_DATA;
WR_IDLE;
RD_IDLE;

ifdef USE_ADAFRUIT_SHIELD_PINOUT

digitalWrite(5, LOW);
delay(2);
digitalWrite(5, HIGH);

else

if(_reset) {
digitalWrite(_reset, LOW);
delay(2);
digitalWrite(_reset, HIGH);
}

endif

delay(2);       // add delay here

// Data transfer sync
CS_ACTIVE;
CD_COMMAND;
write8(0x00);
for(uint8_t i=0; i<3; i++) WR_STROBE; // Three extra 0x00s
CS_IDLE;
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Cheers,
Russ