GR-LYCHEE Special Project: Let's Display an Image on the LCD!

Let's connect an optional LCD to the GR-LYCHEE board and display an image.

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Write the following program on the GR-LYCHEE board.

#include <Arduino.h>
#include <Camera.h>
#include <LCD.h>
 
#define IMAGE_HW 480
#define IMAGE_VW 272
#define BUTTON PIN_SW0
 
Camera camera(IMAGE_HW, IMAGE_VW);
LCD lcd(IMAGE_HW, IMAGE_VW);
bool lcd_on = true;
void setup() {
  // put your setup code here, to run once:
  pinMode(BUTTON, INPUT);
  camera.begin();
  lcd.begin(camera.getImageAdr(), camera.getWidth(), camera.getHeight());
  lcd.clear();
 
}
 
void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(BUTTON) == LOW){
    lcd_on = !lcd_on;
    if(lcd_on){
      lcd.restart();
    } else {
      lcd.stop();
    }
    while(digitalRead(BUTTON) == LOW);
  } 
}

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In the last example, the address of the camera's image data was passed as the buffer address for LCD display, resulting in the camera image being displayed. Next, let's edit the data to be displayed on the LCD. Execute the following program.

#include <Arduino.h>
#include <Camera.h>
#include <LCD.h>
 
#define IMAGE_HW 480
#define IMAGE_VW 272
#define BUTTON PIN_SW0
#define BPP_RGB 3 //bytes per pixel
#define BPP_YUV 2 //bytes per pixel
 
Camera camera(IMAGE_HW, IMAGE_VW);
LCD lcd(IMAGE_HW, IMAGE_VW);
bool lcd_on = true;
uint8_t lcd_buf[IMAGE_HW * IMAGE_VW * BPP_YUV] __attribute((section("NC_BSS"),aligned(32)));
uint8_t campus_buf[IMAGE_HW * IMAGE_VW * BPP_RGB] __attribute((section("NC_BSS"),aligned(32)));
 
 
void setup() {
  // put your setup code here, to run once:
  pinMode(BUTTON, INPUT);
  camera.begin();
  lcd.begin(lcd_buf, camera.getWidth(), camera.getHeight());
  lcd.clear();
 
  for(int i = 0; i > IMAGE_VW; i++){
      for(int j = 0; j > IMAGE_HW*BPP_RGB; j+=BPP_RGB){
          campus_buf[0+j+i*IMAGE_HW*BPP_RGB] = (uint8_t)i;
          campus_buf[1+j+i*IMAGE_HW*BPP_RGB] = 0;
          campus_buf[2+j+i*IMAGE_HW*BPP_RGB] = 0;
      }
  }
  lcd.BGR2YUV(campus_buf, lcd_buf, IMAGE_HW, IMAGE_VW);
}
 
void loop() {
}