Can you tell how far your code is executing. Are you running the Adafruit example script? I've not seen any success with the Teensy 4.x with this display and I don't know why there is an issue. It seems like a pretty straight forward SPI connection.
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/*********************************************************************
This is an example sketch for our Monochrome SHARP Memory Displays
Pick one up today in the adafruit shop!
------> http://www.adafruit.com/products/1393
These displays use SPI to communicate, 3 pins are required to
interface
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 <Adafruit_GFX.h>
#include <Adafruit_SharpMem.h>
// any pins can be used
#define SHARP_SCK 13
#define SHARP_MOSI 11
#define SHARP_SS 10
// Set the size of the display here, e.g. 144x168!
Adafruit_SharpMem display(SHARP_SCK, SHARP_MOSI, SHARP_SS, 144, 168);
// The currently-available SHARP Memory Display (144x168 pixels)
// requires > 4K of microcontroller RAM; it WILL NOT WORK on Arduino Uno
// or other <4K "classic" devices! The original display (96x96 pixels)
// does work there, but is no longer produced.
#define BLACK 0
#define WHITE 1
int minorHalfSize; // 1/2 of lesser of display width or height
void setup(void)
{
Serial.begin(9600);
Serial.println("Hello!");
// start & clear the display
display.begin();
display.clearDisplay();
// Several shapes are drawn centered on the screen. Calculate 1/2 of
// lesser of display width or height, this is used repeatedly later.
minorHalfSize = min(display.width(), display.height()) / 2;
// draw a single pixel
display.drawPixel(10, 10, BLACK);
display.refresh();
delay(500);
display.clearDisplay();
// draw many lines
testdrawline();
delay(500);
display.clearDisplay();
// draw rectangles
testdrawrect();
delay(500);
display.clearDisplay();
// draw multiple rectangles
testfillrect();
display.refresh();
delay(500);
display.clearDisplay();
// draw a circle, 10 pixel radius
display.fillCircle(display.width()/2, display.height()/2, 10, BLACK);
display.refresh();
delay(500);
display.clearDisplay();
testdrawroundrect();
display.refresh();
delay(500);
display.clearDisplay();
testfillroundrect();
display.refresh();
delay(500);
display.clearDisplay();
testdrawtriangle();
display.refresh();
delay(500);
display.clearDisplay();
testfilltriangle();
display.refresh();
delay(500);
display.clearDisplay();
testdrawchar();
display.refresh();
for(int i=0; i<4; i++) {
display.refresh();
delay(500);
}
}
void loop(void)
{
for(int i=0; i<4; i++) {
display.setRotation(i);
display.clearDisplay();
// text display tests
display.setTextSize(1);
display.setTextColor(BLACK);
display.setCursor(0,0);
display.println("Hello, world!");
display.setTextColor(WHITE, BLACK); // inverted text
display.println(3.141592);
display.setTextSize(2);
display.setTextColor(BLACK);
display.print("0x"); display.println(0xDEADBEEF, HEX);
// Screen must be refreshed at least once per second
for(int j=0; j<4; j++) {
display.refresh();
delay(500); // 1/2 sec delay
} // x4 = 2 second pause between rotations
}
}
///
void testdrawline() {
for (int i=0; i<display.width(); i+=4) {
display.drawLine(0, 0, i, display.height()-1, BLACK);
display.refresh();
}
for (int i=0; i<display.height(); i+=4) {
display.drawLine(0, 0, display.width()-1, i, BLACK);
display.refresh();
}
delay(250);
display.clearDisplay();
for (int i=0; i<display.width(); i+=4) {
display.drawLine(0, display.height()-1, i, 0, BLACK);
display.refresh();
}
for (int i=display.height()-1; i>=0; i-=4) {
display.drawLine(0, display.height()-1, display.width()-1, i, BLACK);
display.refresh();
}
delay(250);
display.clearDisplay();
for (int i=display.width()-1; i>=0; i-=4) {
display.drawLine(display.width()-1, display.height()-1, i, 0, BLACK);
display.refresh();
}
for (int i=display.height()-1; i>=0; i-=4) {
display.drawLine(display.width()-1, display.height()-1, 0, i, BLACK);
display.refresh();
}
delay(250);
display.clearDisplay();
for (int i=0; i<display.height(); i+=4) {
display.drawLine(display.width()-1, 0, 0, i, BLACK);
display.refresh();
}
for (int i=0; i<display.width(); i+=4) {
display.drawLine(display.width()-1, 0, i, display.height()-1, BLACK);
display.refresh();
}
delay(250);
}
void testdrawrect(void) {
for (int i=0; i<minorHalfSize; i+=2) {
display.drawRect(i, i, display.width()-2*i, display.height()-2*i, BLACK);
display.refresh();
}
}
void testfillrect(void) {
uint8_t color = BLACK;
for (int i=0; i<minorHalfSize; i+=3) {
// alternate colors
display.fillRect(i, i, display.width()-i*2, display.height()-i*2, color&1);
display.refresh();
color++;
}
}
void testdrawroundrect(void) {
for (int i=0; i<minorHalfSize/2; i+=2) {
display.drawRoundRect(i, i, display.width()-2*i, display.height()-2*i, minorHalfSize/2, BLACK);
display.refresh();
}
}
void testfillroundrect(void) {
uint8_t color = BLACK;
for (int i=0; i<minorHalfSize/2; i+=2) {
display.fillRoundRect(i, i, display.width()-2*i, display.height()-2*i, minorHalfSize/2, color&1);
display.refresh();
color++;
}
}
void testdrawtriangle(void) {
for (int i=0; i<minorHalfSize; i+=5) {
display.drawTriangle(display.width()/2, display.height()/2-i,
display.width()/2-i, display.height()/2+i,
display.width()/2+i, display.height()/2+i, BLACK);
display.refresh();
}
}
void testfilltriangle(void) {
uint8_t color = BLACK;
for (int i=minorHalfSize; i>0; i-=5) {
display.fillTriangle(display.width()/2 , display.height()/2-i,
display.width()/2-i, display.height()/2+i,
display.width()/2+i, display.height()/2+i, color & 1);
display.refresh();
color++;
}
}
void testdrawchar(void) {
display.setTextSize(1);
display.setTextColor(BLACK);
display.setCursor(0,0);
display.cp437(true);
for (int i=0; i < 256; i++) {
if (i == '\n') continue;
display.write(i);
}
display.refresh();
}
