Hello,
I am having issues with connecting to the SD card on the SD cage of the shield ST7735, when connected to an arduino MEGA R3 board (reason for using the MEGA, is that I need to have extra pins for doing measurements with other sensors).
Hardware:
- 1.8" TFT Shield shield ST7735 (Adafruit 1.8 Color TFT Shield w/microSD and Joystick [v 2] : ID 802 : Adafruit Industries, Unique & fun DIY electronics and kits)
- original arduino mega R3 2560
- sanDisk Ultra 128 gb A1 microSD
Code:
right now I being from the seesaw_shield18_test.ino from the examples of the library.
/***************************************************
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 <SPI.h>
#include <SD.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ST7735.h>
// Be sure to install Adafruit seesaw library!
#include <Adafruit_seesaw.h>
#include <Adafruit_TFTShield18.h>
Adafruit_TFTShield18 ss;
// 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 on Shield
#define TFT_CS 10 // Chip select line for TFT display on Shield
#define TFT_DC 8 // Data/command line for TFT on Shield
#define TFT_RST -1 // Reset line for TFT is handled by seesaw!
Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
void setup(void) {
Serial.begin(9600);
while (!Serial);
// start by disabling both SD and TFT
pinMode(TFT_CS, OUTPUT);
digitalWrite(TFT_CS, HIGH);
pinMode(SD_CS, OUTPUT);
digitalWrite(SD_CS, HIGH);
// Start seesaw helper chip
if (!ss.begin()){
Serial.println("seesaw could not be initialized!");
while(1);
}
Serial.println("seesaw started");
Serial.print("Version: "); Serial.println(ss.getVersion(), HEX);
// Start set the backlight off
ss.setBacklight(TFTSHIELD_BACKLIGHT_OFF);
// Reset the TFT
ss.tftReset();
// Initialize 1.8" TFT
tft.initR(INITR_BLACKTAB); // initialize a ST7735S chip, black tab
Serial.println("TFT OK!");
tft.fillScreen(ST77XX_CYAN);
Serial.print("Initializing SD card...");
if (!SD.begin(SD_CS)) {
Serial.println("failed!");
} else {
Serial.println("OK!");
File root = SD.open("/");
printDirectory(root, 0);
root.close();
bmpDraw("/parrot.bmp", 0, 0);
}
// Set backlight on fully
// ss.setBacklight(TFTSHIELD_BACKLIGHT_ON);
// Or you can set the backlight one third on
// ss.setBacklight(TFTSHIELD_BACKLIGHT_ON / 3);
// Or dim it up
for (int32_t i=TFTSHIELD_BACKLIGHT_OFF; i<TFTSHIELD_BACKLIGHT_ON; i+=100) {
ss.setBacklight(i);
delay(1);
}
delay(100);
tft.fillScreen(ST77XX_RED);
delay(100);
tft.fillScreen(ST77XX_GREEN);
delay(100);
tft.fillScreen(ST77XX_BLUE);
delay(100);
tft.fillScreen(ST77XX_BLACK);
tft.setTextSize(1);
tft.setTextColor(ST77XX_WHITE);
tft.setCursor(0, 0);
tft.print("Press all the buttons");
}
uint8_t buttonhistory = 0;
void loop() {
uint32_t buttons = ss.readButtons();
tft.setTextSize(3);
if(! (buttons & TFTSHIELD_BUTTON_DOWN)){
tft.setTextColor(ST77XX_RED);
tft.setCursor(0, 10);
tft.print("Down ");
buttonhistory |= 1;
}
if(! (buttons & TFTSHIELD_BUTTON_LEFT)){
tft.setTextColor(ST77XX_YELLOW);
tft.setCursor(0, 35);
tft.print("Left ");
buttonhistory |= 2;
}
if(! (buttons & TFTSHIELD_BUTTON_UP)){
tft.setTextColor(ST77XX_GREEN);
tft.setCursor(0, 60);
tft.print("Up");
buttonhistory |= 4;
}
if(! (buttons & TFTSHIELD_BUTTON_RIGHT)){
tft.setTextColor(ST77XX_BLUE);
tft.setCursor(0, 85);
tft.print("Right");
buttonhistory |= 8;
}
if(! (buttons & TFTSHIELD_BUTTON_1)){
tft.setTextColor(ST77XX_BLUE);
tft.setCursor(0, 140);
tft.print("1");
buttonhistory |= 16;
}
if(! (buttons & TFTSHIELD_BUTTON_2)){
tft.setTextColor(ST77XX_GREEN);
tft.setCursor(50, 140);
tft.print("2");
buttonhistory |= 32;
}
if(! (buttons & TFTSHIELD_BUTTON_3)){
tft.setTextColor(ST77XX_YELLOW);
tft.setCursor(100, 140);
tft.print("3");
buttonhistory |= 64;
}
if (! (buttons & TFTSHIELD_BUTTON_IN)) {
tft.setTextColor(ST77XX_MAGENTA);
tft.setCursor(0, 110);
tft.print("SELECT");
}
if (buttonhistory == 0x7F) {
bmpDraw("/parrot.bmp", 0, 0);
while (1) {
tft.invertDisplay(true);
delay(500);
tft.invertDisplay(false);
delay(500);
}
}
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, uint16_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(F("Loading image '"));
Serial.print(filename);
Serial.println('\'');
// Open requested file on SD card
if ((bmpFile = SD.open(filename)) == NULL) {
Serial.print(F("File not found"));
return;
}
// Parse BMP header
if(read16(bmpFile) == 0x4D42) { // BMP signature
Serial.print(F("File size: ")); Serial.println(read32(bmpFile));
(void)read32(bmpFile); // Read & ignore creator bytes
bmpImageoffset = read32(bmpFile); // Start of image data
Serial.print(F("Image Offset: ")); Serial.println(bmpImageoffset, DEC);
// Read DIB header
Serial.print(F("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(F("Bit Depth: ")); Serial.println(bmpDepth);
if((bmpDepth == 24) && (read32(bmpFile) == 0)) { // 0 = uncompressed
goodBmp = true; // Supported BMP format -- proceed!
Serial.print(F("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.startWrite();
tft.setAddrWindow(x, y, w, h);
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?
tft.endWrite();
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
tft.startWrite();
}
// 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
tft.endWrite();
Serial.print(F("Loaded in "));
Serial.print(millis() - startTime);
Serial.println(" ms");
} // end goodBmp
}
}
bmpFile.close();
if(!goodBmp) Serial.println(F("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;
}
void printDirectory(File dir, int numTabs) {
while (true) {
File entry = dir.openNextFile();
if (! entry) {
// no more files
break;
}
for (uint8_t i = 0; i < numTabs; i++) {
Serial.print('\t');
}
Serial.print(entry.name());
if (entry.isDirectory()) {
Serial.println("/");
printDirectory(entry, numTabs + 1);
} else {
// files have sizes, directories do not
Serial.print("\t\t");
Serial.println(entry.size(), DEC);
}
entry.close();
}
}
the only particular thing in respect to the MEGA I saw in the guide was in respect with an issue with the SPI communication fro the version 1 see a little bit after the link V1 on UNO vs MEGA. but not 100% sure of the version of the shield, as it is not indicated in the shield nor in the box which came from nor in the vendors page where I bought it. from what I understand it is version 2 as the box says P802. but not 100% sure!
Schematics:
Right now the shield is placed directly over the arduino mega, in same location as it would be for the arduino UNO, so:
shield - arduino mega
SCL-SCL1
SDA-SDA1
AREF-AREF
GND-GND
DIGITAL 13 TO 0 - DIGITAL 13 TO 0
IOr-IOREF
RST-RESTET
3.3V - 3.3 V
5V - 5V
GND-GND
GND -GND
Vin-Vin
ANALOG A0-5 - ANALOG A0-5
and the other 6 pins connected to the ICSP of the MEGA
from the original pins of an UNO the only free ones are the A6 and A7. then from the remaining ones of the MEGA I have the A8 to A15 and de communication from 14 to 21 and the digitals from 22 to 53 and its ground.
when I upload the example, I am getting everything working with exception of the SD card, that is not "Initializing SD card...failed!" (see in the setup function)
I know that the SPI pins changes with the MEGA in respect to the UNO (SPI - Arduino Reference) but not sure that this is the issue, as I tried the same code (with the same schematics of connections over an UNO) and I am also getting failed when connecting to the SD.