DM: working tft 1.8 shield

Adafruit_TFTShield18.cpp

@@ -1,10 +1,13 @@
 #include "Adafruit_TFTShield18.h"
 
 bool Adafruit_TFTShield18::begin(uint8_t addr, int8_t flow){
-    Adafruit_seesaw::begin(addr, flow);
+    if (! Adafruit_seesaw::begin(addr, flow)) {
+        return false;
+    }
 
     pinMode(TFTSHIELD_RESET_PIN, OUTPUT);
     pinModeBulk(TFTSHIELD_BUTTON_ALL, INPUT_PULLUP);
+    return true;
 }
 
 void Adafruit_TFTShield18::setBacklight(uint16_t value){

Adafruit_TFTShield18.h

@@ -6,16 +6,19 @@
 #define TFTSHIELD_ADDR 0x2E
 #define TFTSHIELD_RESET_PIN 3
 
+#define TFTSHIELD_BACKLIGHT_ON  0xFFFF
+#define TFTSHIELD_BACKLIGHT_OFF 0x0000
+
 #define TFTSHIELD_BUTTON_UP_PIN 5
 #define TFTSHIELD_BUTTON_UP (1UL << TFTSHIELD_BUTTON_UP_PIN)
 
 #define TFTSHIELD_BUTTON_DOWN_PIN 8
 #define TFTSHIELD_BUTTON_DOWN (1UL << TFTSHIELD_BUTTON_DOWN_PIN)
 
-#define TFTSHIELD_BUTTON_LEFT_PIN 9
+#define TFTSHIELD_BUTTON_LEFT_PIN 6
 #define TFTSHIELD_BUTTON_LEFT (1UL << TFTSHIELD_BUTTON_LEFT_PIN)
 
-#define TFTSHIELD_BUTTON_RIGHT_PIN 6
+#define TFTSHIELD_BUTTON_RIGHT_PIN 9
 #define TFTSHIELD_BUTTON_RIGHT (1UL << TFTSHIELD_BUTTON_RIGHT_PIN)
 
 #define TFTSHIELD_BUTTON_IN_PIN 7

examples/TFTShield18/shieldtest/shieldtest.ino

@@ -0,0 +1,267 @@
+/***************************************************
+  This is an example sketch for the Adafruit 1.8" TFT shield with joystick
+  This example is for the Seesaw version
+  ----> http://www.adafruit.com/products/802
+
+  Check out the links above for our tutorials and wiring diagrams
+  These displays use SPI to communicate, 4 pins are required to
+  interface
+  One pin is also needed for the joystick, we use analog 3
+  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.
+  MIT license, all text above must be included in any redistribution
+ ****************************************************/
+
+#include <Adafruit_GFX.h>
+#include <Adafruit_ST7735.h>
+#include <SD.h>
+#include <SPI.h>
+#include "Adafruit_TFTShield18.h"
+
+Adafruit_TFTShield18 ss;
+
+#if defined(__SAM3X8E__)
+    #undef __FlashStringHelper::F(string_literal)
+    #define F(string_literal) string_literal
+#endif
+
+// TFT display and SD card will share the hardware SPI interface.
+// Hardware SPI pins are specific to the Arduino board type and
+// cannot be remapped to alternate pins.  For Arduino Uno,
+// Duemilanove, etc., pin 11 = MOSI, pin 12 = MISO, pin 13 = SCK.
+#define SD_CS    4  // Chip select line for SD card
+#define TFT_CS  10  // Chip select line for TFT display
+#define TFT_DC   8  // Data/command line for TFT
+#define TFT_RST  -1  // Reset line for TFT (or connect to +5V)
+
+Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
+
+void setup(void) {
+  Serial.begin(9600);
+
+  if(!ss.begin()){
+    Serial.println("ERROR!");
+    while(1);
+  }
+  else{
+    Serial.println("seesaw started");
+    Serial.print("version: ");
+    Serial.println(ss.getVersion(), HEX);
+
+    ss.tftReset();
+    ss.setBacklight(TFTSHIELD_BACKLIGHT_ON);
+  }
+
+  // Initialize 1.8" TFT
+  tft.initR(INITR_BLACKTAB);   // initialize a ST7735S chip, black tab
+
+  Serial.println("OK!");
+  tft.fillScreen(ST7735_BLACK);
+}
+
+
+uint8_t buttonhistory = 0;
+
+void loop() {
+  uint32_t buttons = ss.readButtons();
+  tft.setTextSize(3);
+  if(! (buttons & TFTSHIELD_BUTTON_DOWN)){
+    tft.setTextColor(ST7735_RED);
+    tft.setCursor(0, 10);
+    tft.print("Down ");
+    buttonhistory |= 1;
+  }
+  if(! (buttons & TFTSHIELD_BUTTON_LEFT)){
+    tft.setTextColor(ST7735_YELLOW);
+    tft.setCursor(0, 35);
+     tft.print("Left ");
+    buttonhistory |= 2;
+  }
+  if(! (buttons & TFTSHIELD_BUTTON_UP)){
+    tft.setTextColor(ST7735_GREEN);
+    tft.setCursor(0, 60);
+    tft.print("Up"); 
+    buttonhistory |= 4;
+  }
+  if(! (buttons & TFTSHIELD_BUTTON_RIGHT)){
+    tft.setTextColor(ST7735_BLUE);
+    tft.setCursor(0, 85);
+    tft.print("Right");
+    buttonhistory |= 8;
+  }
+  if(! (buttons & TFTSHIELD_BUTTON_1)){
+    tft.setTextColor(ST7735_BLUE);
+    tft.setCursor(0, 140);
+    tft.print("1");
+    buttonhistory |= 16;
+  }
+  if(! (buttons & TFTSHIELD_BUTTON_2)){
+    tft.setTextColor(ST7735_GREEN);
+    tft.setCursor(50, 140);
+    tft.print("2");
+    buttonhistory |= 32;
+  }
+  if(! (buttons & TFTSHIELD_BUTTON_3)){
+    tft.setTextColor(ST7735_YELLOW);
+    tft.setCursor(100, 140);
+    tft.print("3");
+    buttonhistory |= 64;
+  }
+  if (! (buttons & TFTSHIELD_BUTTON_IN) && (buttonhistory == 0x7F)) {
+    tft.setTextColor(ST7735_MAGENTA);
+    tft.setCursor(0, 110);
+    tft.print("SELECT");
+    delay(2000);
+    Serial.print("Initializing SD card...");
+    if (!SD.begin(SD_CS)) {
+      Serial.println("failed!");
+      return;
+    }
+    bmpDraw("parrot.bmp", 0, 0);
+    while (1);
+  }
+  delay(100);
+}
+
+// This function opens a Windows Bitmap (BMP) file and
+// displays it at the given coordinates.  It's sped up
+// by reading many pixels worth of data at a time
+// (rather than pixel by pixel).  Increasing the buffer
+// size takes more of the Arduino's precious RAM but
+// makes loading a little faster.  20 pixels seems a
+// good balance.
+
+#define BUFFPIXEL 20
+
+void bmpDraw(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
+  if ((bmpFile = SD.open(filename)) == NULL) {
+    Serial.print("File not found");
+    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'
+      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.");
+}
+
+// These read 16- and 32-bit types from the SD card file.
+// BMP data is stored little-endian, Arduino is little-endian too.
+// May need to reverse subscript order if porting elsewhere.
+
+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;
+}