Howdy everyone. Apologies if this post is not in the correct place.
I have always used the Mega 2560 and I am now trying to use a Teensy 4.0 due to the higher memory.
I am compiling the example sketch from Adafruit_Imagereader "BreakoutST7735-128x128" which I have included below:
// Adafruit_ImageReader test for Adafruit ST7735 TFT Breakout for Arduino.
// Demonstrates loading images from SD card or flash memory to the screen,
// to RAM, and how to query image file dimensions.
// Requires three BMP files in root directory of SD card:
// rgbwheel.bmp, miniwoof.bmp and wales.bmp.
// As written, this uses the microcontroller's SPI interface for the screen
// (not 'bitbang') and must be wired to specific pins (e.g. for Arduino Uno,
// MOSI = pin 11, MISO = 12, SCK = 13). Other pins are configurable below.
#include <Adafruit_GFX.h> // Core graphics library
#include <Adafruit_ST7735.h> // Hardware-specific library
#include <SdFat.h> // SD card & FAT filesystem library
#include <Adafruit_SPIFlash.h> // SPI / QSPI flash library
#include <Adafruit_ImageReader.h> // Image-reading functions
// Comment out the next line to load from SPI/QSPI flash instead of SD card:
#define USE_SD_CARD
// TFT display and SD card share the hardware SPI interface, using
// 'select' pins for each to identify the active device on the bus.
#define SD_CS 4 // SD card select pin
#define TFT_CS 10 // TFT select pin
#define TFT_DC 8 // TFT display/command pin
#define TFT_RST 9 // Or set to -1 and connect to Arduino RESET pin
#if defined(USE_SD_CARD)
SdFat SD; // SD card filesystem
Adafruit_ImageReader reader(SD); // Image-reader object, pass in SD filesys
#else
// SPI or QSPI flash filesystem (i.e. CIRCUITPY drive)
#if defined(__SAMD51__) || defined(NRF52840_XXAA)
Adafruit_FlashTransport_QSPI flashTransport(PIN_QSPI_SCK, PIN_QSPI_CS,
PIN_QSPI_IO0, PIN_QSPI_IO1, PIN_QSPI_IO2, PIN_QSPI_IO3);
#else
#if (SPI_INTERFACES_COUNT == 1)
Adafruit_FlashTransport_SPI flashTransport(SS, &SPI);
#else
Adafruit_FlashTransport_SPI flashTransport(SS1, &SPI1);
#endif
#endif
Adafruit_SPIFlash flash(&flashTransport);
FatVolume filesys;
Adafruit_ImageReader reader(filesys); // Image-reader, pass in flash filesys
#endif
Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
Adafruit_Image img; // An image loaded into RAM
int32_t width = 0, // BMP image dimensions
height = 0;
void setup(void) {
ImageReturnCode stat; // Status from image-reading functions
Serial.begin(9600);
#if !defined(ESP32)
while(!Serial); // Wait for Serial Monitor before continuing
#endif
tft.initR(INITR_144GREENTAB); // Initialize screen
// The Adafruit_ImageReader constructor call (above, before setup())
// accepts an uninitialized SdFat or FatVolume object. This MUST
// BE INITIALIZED before using any of the image reader functions!
Serial.print(F("Initializing filesystem..."));
#if defined(USE_SD_CARD)
// SD card is pretty straightforward, a single call...
if(!SD.begin(SD_CS, SD_SCK_MHZ(10))) { // Breakouts require 10 MHz limit due to longer wires
Serial.println(F("SD begin() failed"));
for(;;); // Fatal error, do not continue
}
#else
// SPI or QSPI flash requires two steps, one to access the bare flash
// memory itself, then the second to access the filesystem within...
if(!flash.begin()) {
Serial.println(F("flash begin() failed"));
for(;;);
}
if(!filesys.begin(&flash)) {
Serial.println(F("filesys begin() failed"));
for(;;);
}
#endif
Serial.println(F("OK!"));
// Fill screen blue. Not a required step, this just shows that we're
// successfully communicating with the screen.
tft.fillScreen(ST7735_BLUE);
// Load full-screen BMP file 'rgbwheel.bmp' at position (0,0) (top left).
// Notice the 'reader' object performs this, with 'tft' as an argument.
Serial.print(F("Loading rgbwheel.bmp to screen..."));
stat = reader.drawBMP("/rgbwheel.bmp", tft, 0, 0);
reader.printStatus(stat); // How'd we do?
// Query the dimensions of image 'miniwoof.bmp' WITHOUT loading to screen:
Serial.print(F("Querying miniwoof.bmp image size..."));
stat = reader.bmpDimensions("/miniwoof.bmp", &width, &height);
reader.printStatus(stat); // How'd we do?
if(stat == IMAGE_SUCCESS) { // If it worked, print image size...
Serial.print(F("Image dimensions: "));
Serial.print(width);
Serial.write('x');
Serial.println(height);
}
// Load small BMP 'wales.bmp' into a GFX canvas in RAM. This should fail
// gracefully on Arduino Uno and other small devices, meaning the image
// will not load, but this won't make the program stop or crash, it just
// continues on without it. Should work on Arduino Mega, Zero, etc.
Serial.print(F("Loading wales.bmp to canvas..."));
stat = reader.loadBMP("/wales.bmp", img);
reader.printStatus(stat); // How'd we do?
delay(2000); // Pause 2 seconds before moving on to loop()
}
void loop() {
for(int r=0; r<4; r++) { // For each of 4 rotations...
tft.setRotation(r); // Set rotation
tft.fillScreen(0); // and clear screen
// Load 4 copies of the 'miniwoof.bmp' image to the screen, some
// partially off screen edges to demonstrate clipping. Globals
// 'width' and 'height' were set by bmpDimensions() call in setup().
for(int i=0; i<4; i++) {
reader.drawBMP("/miniwoof.bmp", tft,
(tft.width() * i / 3) - (width / 2),
(tft.height() * i / 3) - (height / 2));
}
delay(1000); // Pause 1 sec.
// Draw 50 Welsh dragon flags in random positions. This has no effect
// on memory-constrained boards like the Arduino Uno, where the image
// failed to load due to insufficient RAM, but it's NOT fatal.
for(int i=0; i<50; i++) {
// Rather than reader.drawBMP() (which works from SD card),
// a different function is used for RAM-resident images:
img.draw(tft, // Pass in tft object
(int16_t)random(-img.width() , tft.width()) , // Horiz pos.
(int16_t)random(-img.height(), tft.height())); // Vert pos
// Reiterating a prior point: img.draw() does nothing and returns
// if the image failed to load. It's unfortunate but not disastrous.
}
delay(2000); // Pause 2 sec.
}
}
When I compile the code with Mega2560 set as the board, it compiles fine. When I compile the same code and only change the board to Teensy 4.0, I receive the following error:
error: no matching function for call to 'Adafruit_ImageReader::Adafruit_ImageReader(SdFat&)'
note: candidate: 'Adafruit_ImageReader::Adafruit_ImageReader(FatVolume&)'
So when I compile for the teensy, the imagereader function now expects FatVolume instead of SdFat? Why does this code compile for Mega2560 but not for Teensy 4.0? Shouldn't it be using the same Adafruit Imagereader library with the same functions?
Clearly I am missing something. If anyone could point me in the right direction it would be much appreciated.
Thanks everyone 