NeTgHoSt
Member
Hello, first post. New owner of a Teensy 3.2, purchased to replace my Arduino Uno's limited ram situation. I have struggled for months with this "simple" endeavour, so the hardware and libraries used has changed a few times since the beginning of my attempts to make this work; displaying a bitmap image from an attached (Adafruit SPI) MicroSD Card Reader+, to an SPI ST7735s 80x160 "OLED" (clone) display. (I couldn't find the clone display for Fritzing, so I used the Adafruit one. Pins are a bit different, and it runs w/3.3V but my clone is all 5v/3.3v tolerant, running on 5v. I just wired it in fritzing as similar as I could to the real thing.) The current sketch is supposed to play a startup tune, load an image to the display, erase it, and then display temperature readings from a thermistor. The sketch works as intended until after it has loaded maybe 100 or so pixels of the image, and then starts printing repeating blocks of pixels/colors to the display. The patterns of pixels change with every run of the code, and change alot when I change the pixel buffer value in the bmpDraw function. I am currently using Teensyduino, the Teensy Optimized ST7735_t3 library, and SD library. Here is my current code and a photo of the image trying to load on the display:
Code:
#include <Adafruit_GFX.h>
#include <SD.h>
#include <ST7735_t3.h> // Hardware-specific library
#include <SPI.h>
#include "pitches.h"
#define TFT_MOSI 11 //a12
#define TFT_SCLK 13 //a13
#define TFT_DC 20
#define TFT_CS 15
#define TFT_RST 14
#define SD_CS 17
int tempPin = A4;
int melody[] = {
NOTE_C4, NOTE_G3, NOTE_G3, NOTE_A3, NOTE_G3, 0, NOTE_B3, NOTE_C4
};
int noteDurations[] = {
4, 8, 8, 4, 4, 4, 4, 4
};
ST7735_t3 tft = ST7735_t3(TFT_CS, TFT_DC, TFT_MOSI, TFT_SCLK, TFT_RST);
void setup(void) {
pinMode(SD_CS, INPUT_PULLUP); // keep SD CS high when not using SD card
analogReference(EXTERNAL);
tft.initR(INITR_MINI160x80_ST7735S);
tft.setRotation(3);
tft.fillScreen(ST7735_BLACK);
Serial.begin(9600);
Serial.print("TFT Init!"); // Screen Initialized
musicalnotes(); //Play Startup Sound
Serial.print("Initializing SD card...");
if (!SD.begin(SD_CS)) {
Serial.println("failed!");
tft.fillScreen(ST7735_BLACK);
tft.setCursor(5, tft.height()/2 - 6);
tft.print("Unable to access");
tft.setCursor(32, tft.height()/2 + 6);
tft.print("SD card");
while (1) {
// do nothing if SD card not working
}
}
Serial.println("OK!"); // Sd Initialized
bmpDraw("parrot.bmp", 24, 0);
delay(5000);
tft.fillScreen(ST7735_GREEN); //Green Border (background)
tft.fillRect(2,2,156,76, ST7735_BLACK); //Fill rest w/Black
tft.drawLine(79, 2, 79, 18, ST7735_GREEN); //Vertical Line
tft.drawLine(89, 19, 89, 87, ST7735_GREEN); //Vertical Line 2
tft.drawLine(2, 19, 157, 19, ST7735_GREEN); //Horizontal Line
tft.setTextColor(ST7735_GREEN, ST7735_BLACK);
tft.setTextSize(2);
tft.setCursor(4, 3);
tft.print("Temp*F");
tft.setCursor(82, 3);
tft.print("Temp*C");
tft.setTextSize(4);
tft.setTextColor(ST7735_RED, ST7735_BLACK);
}
void loop() {
int tempReading = analogRead(tempPin);
double tempK = log(10000.0 * ((1024.0 / tempReading - 1)));
tempK = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * tempK * tempK )) * tempK ); // Temp Kelvin
float tempC = tempK - 273.15; // Convert Kelvin to Celcius
float tempF = (tempC * 9.0)/ 5.0 + 32.0; // Convert Celcius to Fahrenheit
int TempFInt = tempF;
int TempCInt = tempC;
tft.drawNumber(TempFInt, 8, 34);
tft.drawNumber(TempCInt, 102, 34);
if (TempFInt < 100) {
tft.setTextColor(ST7735_GREEN, ST7735_BLACK);
tft.setCursor(58, 34);
tft.print("F");
tft.setTextColor(ST7735_RED, ST7735_BLACK);
//tft.fillRect(54,34,24,32, ST7735_BLACK);
}
delay(100);
}
void musicalnotes() {
for (int thisNote = 0; thisNote < 8; thisNote++) {
// to calculate the note duration, take one second divided by the note type.
//e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
int noteDuration = 1000 / noteDurations[thisNote];
tone(6, melody[thisNote], noteDuration);
// to distinguish the notes, set a minimum time between them.
// the note's duration + 30% seems to work well:
int pauseBetweenNotes = noteDuration * 1.30;
delay(pauseBetweenNotes);
// stop the tone playing:
noTone(6);
}
}
#define BUFFPIXEL 20
void bmpDraw(const char *filename, uint8_t x, uint8_t y) {
File bmpFile;
int bmpWidth, bmpHeight; // W+H in pixels
uint8_t bmpDepth; // Bit depth (currently must be 24)
uint32_t bmpImageoffset; // Start of image data in file
uint32_t rowSize; // Not always = bmpWidth; may have padding
uint8_t sdbuffer[3*BUFFPIXEL]; // pixel buffer (R+G+B per pixel)
uint8_t buffidx = sizeof(sdbuffer); // Current position in sdbuffer
boolean goodBmp = false; // Set to true on valid header parse
boolean flip = true; // BMP is stored bottom-to-top
int w, h, row, col;
uint8_t r, g, b;
uint32_t pos = 0, startTime = millis();
if((x >= tft.width()) || (y >= tft.height())) return;
Serial.println();
Serial.print("Loading image '");
Serial.print(filename);
Serial.println('\'');
// Open requested file on SD card
bmpFile = SD.open(filename);
if (!bmpFile) {
Serial.print("File not found");
tft.fillScreen(ST7735_BLACK);
tft.setCursor(12, tft.height()/2 - 12);
tft.print("Unable to");
tft.setCursor(12, tft.height()/2 - 0);
tft.print("read file: ");
tft.setCursor(12, tft.height()/2 + 12);
tft.setTextColor(ST7735_YELLOW);
tft.print(filename);
return;
}
// Parse BMP header
if(read16(bmpFile) == 0x4D42) { // BMP signature
Serial.print("File size: "); Serial.println(read32(bmpFile));
(void)read32(bmpFile); // Read & ignore creator bytes
bmpImageoffset = read32(bmpFile); // Start of image data
Serial.print("Image Offset: "); Serial.println(bmpImageoffset, DEC);
// Read DIB header
Serial.print("Header size: "); Serial.println(read32(bmpFile));
bmpWidth = read32(bmpFile);
bmpHeight = read32(bmpFile);
if(read16(bmpFile) == 1) { // # planes -- must be '1'
Serial.println("No. of Planes: 1");
bmpDepth = read16(bmpFile); // bits per pixel
Serial.print("Bit Depth: "); Serial.println(bmpDepth);
if((bmpDepth == 24) && (read32(bmpFile) == 0)) { // 0 = uncompressed
goodBmp = true; // Supported BMP format -- proceed!
Serial.print("Image size: ");
Serial.print(bmpWidth);
Serial.print('x');
Serial.println(bmpHeight);
// BMP rows are padded (if needed) to 4-byte boundary
rowSize = (bmpWidth * 3 + 3) & ~3;
// If bmpHeight is negative, image is in top-down order.
// This is not canon but has been observed in the wild.
if(bmpHeight < 0) {
bmpHeight = -bmpHeight;
flip = false;
}
// Crop area to be loaded
w = bmpWidth;
h = bmpHeight;
if((x+w-1) >= tft.width()) w = tft.width() - x;
if((y+h-1) >= tft.height()) h = tft.height() - y;
// Set TFT address window to clipped image bounds
tft.setAddrWindow(x, y, x+w-1, y+h-1);
for (row=0; row<h; row++) { // For each scanline...
// Seek to start of scan line. It might seem labor-
// intensive to be doing this on every line, but this
// method covers a lot of gritty details like cropping
// and scanline padding. Also, the seek only takes
// place if the file position actually needs to change
// (avoids a lot of cluster math in SD library).
if(flip) // Bitmap is stored bottom-to-top order (normal BMP)
pos = bmpImageoffset + (bmpHeight - 1 - row) * rowSize;
else // Bitmap is stored top-to-bottom
pos = bmpImageoffset + row * rowSize;
if(bmpFile.position() != pos) { // Need seek?
bmpFile.seek(pos);
buffidx = sizeof(sdbuffer); // Force buffer reload
}
for (col=0; col<w; col++) { // For each pixel...
// Time to read more pixel data?
if (buffidx >= sizeof(sdbuffer)) { // Indeed
bmpFile.read(sdbuffer, sizeof(sdbuffer));
buffidx = 0; // Set index to beginning
}
// Convert pixel from BMP to TFT format, push to display
b = sdbuffer[buffidx++];
g = sdbuffer[buffidx++];
r = sdbuffer[buffidx++];
tft.pushColor(tft.Color565(r,g,b));
} // end pixel
} // end scanline
Serial.print("Loaded in ");
Serial.print(millis() - startTime);
Serial.println(" ms");
} // end goodBmp
}
}
bmpFile.close();
if(!goodBmp) Serial.println("BMP format not recognized.");
}
uint16_t read16(File f) {
uint16_t result;
((uint8_t *)&result)[0] = f.read(); // LSB
((uint8_t *)&result)[1] = f.read(); // MSB
return result;
}
uint32_t read32(File f) {
uint32_t result;
((uint8_t *)&result)[0] = f.read(); // LSB
((uint8_t *)&result)[1] = f.read();
((uint8_t *)&result)[2] = f.read();
((uint8_t *)&result)[3] = f.read(); // MSB
return result;
}Attachments
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