Code:
/******************************************************************
This is an example for the Adafruit RA8875 Driver board for TFT displays
---------------> http://www.adafruit.com/products/1590
The RA8875 is a TFT driver for up to 800x480 dotclock'd displays
It is tested to work with displays in the Adafruit shop. Other displays
may need timing adjustments and are not guanteed to work.
Adafruit invests time and resources providing this open
source code, please support Adafruit and open-source hardware
by purchasing products from Adafruit!
Written by Limor Fried/Ladyada for Adafruit Industries.
BSD license, check license.txt for more information.
All text above must be included in any redistribution.
******************************************************************/
#include <SPI.h>
#include "Adafruit_GFX.h"
#include "Adafruit_RA8875.h"
// Library only supports hardware SPI at this time
// Connect SCLK to UNO Digital #13 (Hardware SPI clock)
// Connect MISO to UNO Digital #12 (Hardware SPI MISO)
// Connect MOSI to UNO Digital #11 (Hardware SPI MOSI)
#define RA8875_INT 3
#define RA8875_CS 10
#define RA8875_RESET 9
#define RA8875_INT_2 2
#define RA8875_CS_2 8
#define RA8875_RESET_2 7
Adafruit_RA8875 tft = Adafruit_RA8875(RA8875_CS, RA8875_RESET);
Adafruit_RA8875 tft2 = Adafruit_RA8875(RA8875_CS_2, RA8875_RESET_2);
uint16_t tx, ty;
void tftSetup(Adafruit_RA8875 *tft)
{
tft->displayOn(true);
tft->GPIOX(true); // Enable TFT - display enable tied to GPIOX
tft->PWM1config(true, RA8875_PWM_CLK_DIV1024); // PWM output for backlight
tft->PWM1out(255);
// With hardware accelleration this is instant
tft->fillScreen(RA8875_WHITE);
// Play with PWM
for (uint8_t i=255; i!=0; i-=5 )
{
tft->PWM1out(i);
delay(10);
}
for (uint8_t i=0; i!=255; i+=5 )
{
tft->PWM1out(i);
delay(10);
}
tft->PWM1out(255);
tft->fillScreen(RA8875_RED);
delay(500);
tft->fillScreen(RA8875_YELLOW);
delay(500);
tft->fillScreen(RA8875_GREEN);
delay(500);
tft->fillScreen(RA8875_CYAN);
delay(500);
tft->fillScreen(RA8875_MAGENTA);
delay(500);
tft->fillScreen(RA8875_BLACK);
// Try some GFX acceleration!
tft->drawCircle(100, 100, 50, RA8875_BLACK);
tft->fillCircle(100, 100, 49, RA8875_GREEN);
tft->fillRect(11, 11, 398, 198, RA8875_BLUE);
tft->drawRect(10, 10, 400, 200, RA8875_GREEN);
tft->fillRoundRect(200, 10, 200, 100, 10, RA8875_RED);
tft->drawPixel(10,10,RA8875_BLACK);
tft->drawPixel(11,11,RA8875_BLACK);
tft->drawLine(10, 10, 200, 100, RA8875_RED);
tft->drawTriangle(200, 15, 250, 100, 150, 125, RA8875_BLACK);
tft->fillTriangle(200, 16, 249, 99, 151, 124, RA8875_YELLOW);
tft->drawEllipse(300, 100, 100, 40, RA8875_BLACK);
tft->fillEllipse(300, 100, 98, 38, RA8875_GREEN);
// Argument 5 (curvePart) is a 2-bit value to control each corner (select 0, 1, 2, or 3)
tft->drawCurve(50, 100, 80, 40, 2, RA8875_BLACK);
tft->fillCurve(50, 100, 78, 38, 2, RA8875_WHITE);
}
void setup()
{
Serial.begin(57600);
while(!Serial){}
Serial.println("RA8875 start");
/* Initialise the display using 'RA8875_480x272' or 'RA8875_800x480' */
if (!tft.begin(RA8875_800x480)) {
Serial.println("RA8875 Not Found!");
while (1);
}
Serial.println("Found RA8875");
Serial.println("RA8875 2 start");
/* Initialise the display using 'RA8875_480x272' or 'RA8875_800x480' */
if (!tft2.begin(RA8875_800x480)) {
Serial.println("RA8875 2 Not Found!");
while (1);
}
Serial.println("Found RA8875 2");
tftSetup(&tft);
tftSetup(&tft2);
pinMode(RA8875_INT, INPUT);
digitalWrite(RA8875_INT, HIGH);
tft.touchEnable(true);
Serial.print("Status: "); Serial.println(tft.readStatus(), HEX);
Serial.println("Waiting for touch events ...");
}
void loop()
{
float xScale = 1024.0F/tft.width();
float yScale = 1024.0F/tft.height();
/* Wait around for touch events */
if (! digitalRead(RA8875_INT))
{
if (tft.touched())
{
Serial.print("Touch: ");
tft.touchRead(&tx, &ty);
Serial.print(tx); Serial.print(", "); Serial.println(ty);
/* Draw a circle */
tft.fillCircle((uint16_t)(tx/xScale), (uint16_t)(ty/yScale), 4, RA8875_WHITE);
}
}
}
with the same setup (two RA8875's connected to one a microcontroller) works on a Arduino UNO (ATMEL 328P) but not on a Arduino YUN (32U4) nor a teensy++ 20 (AT90USB1286) nor a teensy 3.1 (MK20DX256) where I always get an error when initializing the first RA8875 on the SPI-bus 
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Originally Posted by MichaelMeissner
