Code:
/***************************************************
This is our GFX example for the Adafruit ILI9488 Breakout and Shield
----> http://www.adafruit.com/products/1651
Check out the links above for our tutorials and wiring diagrams
These displays use SPI to communicate, 4 or 5 pins are required to
interface (RST is optional)
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.
MIT license, all text above must be included in any redistribution
****************************************************/
#include "SPI.h"
#include "KeDeiRPI35_t3.h"
//#define TEENSY64
// For the Adafruit shield, these are the default.
#if defined(__MK66FX1M0__) && !defined(TEENSY64)
#define TOUCH_CS 2
#define TFT_CS 26
KEDEIRPI35_t3 tft = KEDEIRPI35_t3(&SPI, TFT_CS, TOUCH_CS);
#elif defined(__IMXRT1052__) || defined(__IMXRT1062__)
// On Teensy 4 beta with Paul's breakout out:
// Using pins (MOSI, MISO, SCK which are labeled on Audio board breakout location
// which are not in the Normal processor positions
// Also DC=10(CS), CS=9(BCLK) and RST 23(MCLK)
#define TOUCH_CS 2
#define TFT_CS 26
KEDEIRPI35_t3 tft = KEDEIRPI35_t3(&SPI, TFT_CS, TOUCH_CS);
#elif defined(TEENSY64)
#define TFT_DC 27
#define TFT_CS 26
#define TFT_SCK 13
#define TFT_MISO 12
#define TFT_MOSI 11
KEDEIRPI35_t3 tft = KEDEIRPI35_t3(&SPI, TFT_CS, TOUCH_CS, TFT_MOSI, TFT_SCK, TFT_MISO);
#else
#error "This example App will only work with Teensy 3.6 or Teensy 4."
#endif
void setup() {
tft.begin();
tft.fillScreen(KEDEIRPI35_BLACK);
tft.setTextColor(KEDEIRPI35_YELLOW);
tft.setTextSize(2);
tft.println("Waiting for Arduino Serial Monitor...");
tft.setOrigin(0,0);
Serial.begin(9600);
while (!Serial) ; // wait for Arduino Serial Monitor
Serial.println("ILI9488 Test!");
// read diagnostics (optional but can help debug problems)
uint8_t x = tft.readcommand8(KEDEIRPI35_RDMODE);
Serial.print("Display Power Mode: 0x"); Serial.println(x, HEX);
x = tft.readcommand8(KEDEIRPI35_RDMADCTL);
Serial.print("MADCTL Mode: 0x"); Serial.println(x, HEX);
x = tft.readcommand8(KEDEIRPI35_RDPIXFMT);
Serial.print("Pixel Format: 0x"); Serial.println(x, HEX);
x = tft.readcommand8(KEDEIRPI35_RDIMGFMT);
Serial.print("Image Format: 0x"); Serial.println(x, HEX);
x = tft.readcommand8(KEDEIRPI35_RDSELFDIAG);
Serial.print("Self Diagnostic: 0x"); Serial.println(x, HEX);
Serial.println(F("Benchmark Time (microseconds)"));
Serial.print(F("Screen fill "));
Serial.println(testFillScreen());
delay(200);
Serial.print(F("Text "));
Serial.println(testText());
delay(600);
Serial.print(F("Lines "));
Serial.println(testLines(KEDEIRPI35_CYAN));
delay(500);
Serial.print(F("Horiz/Vert Lines "));
Serial.println(testFastLines(KEDEIRPI35_RED, KEDEIRPI35_BLUE));
delay(500);
Serial.print(F("Rectangles (outline) "));
Serial.println(testRects(KEDEIRPI35_GREEN));
delay(500);
Serial.print(F("Rectangles (filled) "));
Serial.println(testFilledRects(KEDEIRPI35_YELLOW, KEDEIRPI35_MAGENTA));
delay(500);
Serial.print(F("Circles (filled) "));
Serial.println(testFilledCircles(10, KEDEIRPI35_MAGENTA));
Serial.print(F("Circles (outline) "));
Serial.println(testCircles(10, KEDEIRPI35_WHITE));
delay(200);
Serial.print(F("Triangles (outline) "));
Serial.println(testTriangles());
delay(200);
Serial.print(F("Triangles (filled) "));
Serial.println(testFilledTriangles());
delay(200);
Serial.print(F("Rounded rects (outline) "));
Serial.println(testRoundRects());
delay(200);
Serial.print(F("Rounded rects (filled) "));
Serial.println(testFilledRoundRects());
delay(200);
Serial.println(F("Done!"));
}
void loop(void) {
for(uint8_t rotation=0; rotation<4; rotation++) {
tft.setRotation(rotation);
testText();
delay(1000);
}
}
unsigned long testFillScreen() {
unsigned long start = micros();
tft.fillScreen(KEDEIRPI35_BLACK);
tft.fillScreen(KEDEIRPI35_RED);
tft.fillScreen(KEDEIRPI35_GREEN);
tft.fillScreen(KEDEIRPI35_BLUE);
tft.fillScreen(KEDEIRPI35_BLACK);
return micros() - start;
}
unsigned long testText() {
tft.fillScreen(KEDEIRPI35_BLACK);
unsigned long start = micros();
tft.setCursor(0, 0);
tft.setTextColor(KEDEIRPI35_WHITE); tft.setTextSize(1);
tft.println("Hello World!");
tft.setTextColor(KEDEIRPI35_YELLOW); tft.setTextSize(2);
tft.println(1234.56);
tft.setTextColor(KEDEIRPI35_RED); tft.setTextSize(3);
tft.println(0xDEADBEEF, HEX);
tft.println();
tft.setTextColor(KEDEIRPI35_GREEN);
tft.setTextSize(5);
tft.println("Groop");
tft.setTextSize(2);
tft.println("I implore thee,");
tft.setTextSize(1);
tft.println("my foonting turlingdromes.");
tft.println("And hooptiously drangle me");
tft.println("with crinkly bindlewurdles,");
tft.println("Or I will rend thee");
tft.println("in the gobberwarts");
tft.println("with my blurglecruncheon,");
tft.println("see if I don't!");
return micros() - start;
}
unsigned long testLines(uint16_t color) {
unsigned long start, t;
int x1, y1, x2, y2,
w = tft.width(),
h = tft.height();
tft.fillScreen(KEDEIRPI35_BLACK);
x1 = y1 = 0;
y2 = h - 1;
start = micros();
for(x2=0; x2<w; x2+=6) tft.drawLine(x1, y1, x2, y2, color);
x2 = w - 1;
for(y2=0; y2<h; y2+=6) tft.drawLine(x1, y1, x2, y2, color);
t = micros() - start; // fillScreen doesn't count against timing
tft.fillScreen(KEDEIRPI35_BLACK);
x1 = w - 1;
y1 = 0;
y2 = h - 1;
start = micros();
for(x2=0; x2<w; x2+=6) tft.drawLine(x1, y1, x2, y2, color);
x2 = 0;
for(y2=0; y2<h; y2+=6) tft.drawLine(x1, y1, x2, y2, color);
t += micros() - start;
tft.fillScreen(KEDEIRPI35_BLACK);
x1 = 0;
y1 = h - 1;
y2 = 0;
start = micros();
for(x2=0; x2<w; x2+=6) tft.drawLine(x1, y1, x2, y2, color);
x2 = w - 1;
for(y2=0; y2<h; y2+=6) tft.drawLine(x1, y1, x2, y2, color);
t += micros() - start;
tft.fillScreen(KEDEIRPI35_BLACK);
x1 = w - 1;
y1 = h - 1;
y2 = 0;
start = micros();
for(x2=0; x2<w; x2+=6) tft.drawLine(x1, y1, x2, y2, color);
x2 = 0;
for(y2=0; y2<h; y2+=6) tft.drawLine(x1, y1, x2, y2, color);
return micros() - start;
}
unsigned long testFastLines(uint16_t color1, uint16_t color2) {
unsigned long start;
int x, y, w = tft.width(), h = tft.height();
tft.fillScreen(KEDEIRPI35_BLACK);
start = micros();
for(y=0; y<h; y+=5) tft.drawFastHLine(0, y, w, color1);
for(x=0; x<w; x+=5) tft.drawFastVLine(x, 0, h, color2);
return micros() - start;
}
unsigned long testRects(uint16_t color) {
unsigned long start;
int n, i, i2,
cx = tft.width() / 2,
cy = tft.height() / 2;
tft.fillScreen(KEDEIRPI35_BLACK);
n = min(tft.width(), tft.height());
start = micros();
for(i=2; i<n; i+=6) {
i2 = i / 2;
tft.drawRect(cx-i2, cy-i2, i, i, color);
}
return micros() - start;
}
unsigned long testFilledRects(uint16_t color1, uint16_t color2) {
unsigned long start, t = 0;
int n, i, i2,
cx = tft.width() / 2 - 1,
cy = tft.height() / 2 - 1;
tft.fillScreen(KEDEIRPI35_BLACK);
n = min(tft.width(), tft.height()) - 1;
for(i=n; i>0; i-=6) {
i2 = i / 2;
start = micros();
tft.fillRect(cx-i2, cy-i2, i, i, color1);
t += micros() - start;
// Outlines are not included in timing results
tft.drawRect(cx-i2, cy-i2, i, i, color2);
}
return t;
}
unsigned long testFilledCircles(uint8_t radius, uint16_t color) {
unsigned long start;
int x, y, w = tft.width(), h = tft.height(), r2 = radius * 2;
tft.fillScreen(KEDEIRPI35_BLACK);
start = micros();
for(x=radius; x<w; x+=r2) {
for(y=radius; y<h; y+=r2) {
tft.fillCircle(x, y, radius, color);
}
}
return micros() - start;
}
unsigned long testCircles(uint8_t radius, uint16_t color) {
unsigned long start;
int x, y, r2 = radius * 2,
w = tft.width() + radius,
h = tft.height() + radius;
// Screen is not cleared for this one -- this is
// intentional and does not affect the reported time.
start = micros();
for(x=0; x<w; x+=r2) {
for(y=0; y<h; y+=r2) {
tft.drawCircle(x, y, radius, color);
}
}
return micros() - start;
}
unsigned long testTriangles() {
unsigned long start;
int n, i, cx = tft.width() / 2 - 1,
cy = tft.height() / 2 - 1;
tft.fillScreen(KEDEIRPI35_BLACK);
n = min(cx, cy);
start = micros();
for(i=0; i<n; i+=5) {
tft.drawTriangle(
cx , cy - i, // peak
cx - i, cy + i, // bottom left
cx + i, cy + i, // bottom right
tft.color565(0, 0, i));
}
return micros() - start;
}
unsigned long testFilledTriangles() {
unsigned long start, t = 0;
int i, cx = tft.width() / 2 - 1,
cy = tft.height() / 2 - 1;
tft.fillScreen(KEDEIRPI35_BLACK);
start = micros();
for(i=min(cx,cy); i>10; i-=5) {
start = micros();
tft.fillTriangle(cx, cy - i, cx - i, cy + i, cx + i, cy + i,
tft.color565(0, i, i));
t += micros() - start;
tft.drawTriangle(cx, cy - i, cx - i, cy + i, cx + i, cy + i,
tft.color565(i, i, 0));
}
return t;
}
unsigned long testRoundRects() {
unsigned long start;
int w, i, i2,
cx = tft.width() / 2 - 1,
cy = tft.height() / 2 - 1;
tft.fillScreen(KEDEIRPI35_BLACK);
w = min(tft.width(), tft.height()) - 1;
start = micros();
for(i=0; i<w; i+=6) {
i2 = i / 2;
tft.drawRoundRect(cx-i2, cy-i2, i, i, i/8, tft.color565(i, 0, 0));
}
return micros() - start;
}
unsigned long testFilledRoundRects() {
unsigned long start;
int i, i2,
cx = tft.width() / 2 - 1,
cy = tft.height() / 2 - 1;
tft.fillScreen(KEDEIRPI35_BLACK);
start = micros();
for(i=min(tft.width(), tft.height()) - 1; i>20; i-=6) {
i2 = i / 2;
tft.fillRoundRect(cx-i2, cy-i2, i, i, i/8, tft.color565(0, i, 0));
}
return micros() - start;
}
And here is the serial monitor printout:
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They clearly refined the chipset and processing from the model A as the circuitry on the back is quite different and very little effort was needed to modify "regular" Teensy SPI driver code to work with it. Anyway, the upshot was, on T4.1 @ 600Mhz, I went from a respectable 51ms for a fullscreen 480x320x16bpp refresh on a BuyDisplay SPI ILI9488 @ 80Mhz, to 26ms on the WaveShare Model C, pushing the SPI bus to 119Mhz. The extra bus speed in conjunction with a 2 byte data transfer for 16bpp (vs 3 byte on the ILI9488) effectively doubled the transfer speed. 
Originally Posted by beermat
