hi all,
I'm in need of some help with a wierd but basic issue on a device I am making for a disabled scooter. I built a circuit and wrote some code using an arduino but ran into memory and storage problems, so I moved the circuit to a Pico and tried the Arduino code in the Arduino IDE. The LCD code didn't work so I did the usual and cut it down to basics.
The arduino and Pico connect to various modules, but the one that I'm having an issue with is the ST7735 TFT.
If you run the below code it works fine, but if you then uncomment the tft.print("Test"); statement the whole display flashes rapidly.
I've swapped the screen, reinstalled and tried alternative libraries. I've also swapped SPI pins.
The screen works great on the Arduino and works when the print statement is not active so it's likely not the screen unless it has some issue that only shows itself on the Pico. It seems like the SPI bus is running too fast or not being initialised properly but I'm having difficulty narrowing it down.
Your help would be much appreciated.
ST7735 Rpi Pico
SCK GP10
SDA(MOSI) GP11
DC GP7
RESET GP8
CS GP9
GND GND
LED / PWR 3V3
// Load the Libraries
#include <Adafruit_GFX.h> // Adafruit LCD Graphics library
#include <Adafruit_ST7735.h> // ST7735 LCD Display library
#include <SPI.h> // Arduino SPI and I2C library
// pin definition for the 1.8", 128x160 ST7735 LCD Display on Raspberry Pico
// These can be connected to any GP Pin not in use
#define TFT_CS 9 // using SPI1 CSn
#define TFT_RST 8
#define TFT_DC 7
// Used for SPI connectivity on SPI1
#define TFT_SCK 10
#define TFT_MOSI 11
// #define TFT_MISO // not used with this display
// Setup the ST7735 LCD Display and variables
Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_MOSI, TFT_SCK, TFT_RST);
// Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
int textxoffset = 5; // move 5 pixels across to avoid the box
int textyoffset = 7; // move 7 pixels down to avoid the box
int tft_line1 = 0;
void setup() {
// put your setup code here, to run once:
tft.initR(INITR_BLACKTAB); // initialize a ST7735S chip, black tab
tft.fillScreen(ST7735_BLACK); // Fill the screen with Black
tft.setRotation(1); // Set rotation to Portrait mode (set to '1' for Landscape)
tft.setTextWrap(false); // By default long lines of text are NOT wrapped at the end of the line, set to 'TRUE' for wrapping the text
// Draw the 1.8" LED display layout using 24 bit colour (limitation of the ST7735S library)
// tft.drawRect(0, 0, 159, 128, ST7735_CYAN); // Draw a Rectangle x,y, across, down for the Colour Values
tft.drawRoundRect(0, 0, 83, 31, 10, ST7735_CYAN); // Draw a Rectangle x,y, across, down with corner & Colour Values
tft.drawRoundRect(0, 35, 160, 93, 10, ST7735_CYAN); // Draw a Rectangle x,y, across, down with corner & Colour Values
tft.drawLine(80, 65, 80, 110, ST7735_CYAN); // Draw a mid-line x1,y1, x2, y2 for the Colour Values
tft.setTextColor(ST7735_GREEN, ST7735_BLACK);
tft.setTextSize(1); // Set the text size to 1
tft.setCursor(textxoffset + 54,textyoffset + 1);
// tft.print("Test");
}
void loop() {
// put your main code here, to run repeatedly:
}
