3.5TFTLCD MCUFriend Showing Bitmaps

Using Arduino Programming Questions
#1

Hello,

I'm having difficulty wrapping my brain around a project. I'm using a Mega 2560R3 with a 3.5TFTLCD. Bitmaps are downloaded on a micro SD card and show up using the code MCUFRIEND_kbv - showBMP_kbv_UNO

So I'm trying to utilize this code to display a bitmap when a digital pin reads HIGH.

Here is what I added to the code to far:
int buttonPin = 31; // show BrakeLampOut.bmp
int buttonPin = 33; // show LF.bmp
int buttonPin = 35; // show HeadlampOut.bmp
int buttonPin = 37; // show LowWiperFluid.bmp
int buttonPin = 39; // show LR.bmp
int buttonPin = 41; // show RF.bmp
int buttonPin = 43; // show RR.bmp
int buttonPin = 45; // show TailLampOut.bmp
int buttonPin = 47; // show Trunk.bmp

How/where would I write the if statements to trigger a bitmap when a digital pin receives 5v?

Also, is creating a home screen possible??? ...if none of the digital input are on, then display _____.bmp

I'm sure it's simple, but I've been drinking from the proverbial firehose of all things arduino :frowning:

#2

Any thoughts? Should I ditch the MCUFRIEND code and try something else?

#3 
const int buttonPin1 = 31;
const int buttonPin2 = 33;
const int buttonPin3 = 35;
int buttonState1 = 0;
int buttonState2 = 0;
int buttonState3 = 0;

#include <SPI.h>             // f.k. for Arduino-1.5.2
#define USE_SDFAT
#include <SdFat.h>           // Use the SdFat library
SdFatSoftSpi<50, 51, 52> SD; //Bit-Bang on the Shield pins
#include <Adafruit_GFX.h>    // Hardware-specific library
#include <MCUFRIEND_kbv.h>
#define SD_CS     10
MCUFRIEND_kbv tft;
#define PALETTEDEPTH   8     // support 256-colour Palette
char namebuf[32] = "/";   //BMP files in root directory
File root;
int pathlen;

void setup() {
pinMode(buttonPin1, INPUT);
pinMode(buttonPin2, INPUT);
pinMode(buttonPin3, INPUT);

uint16_t ID;
    Serial.begin(9600);
    Serial.print("Show BMP files on TFT with ID:0x");
    ID = tft.readID();
    Serial.println(ID, HEX);
    if (ID == 0x0D3D3) ID = 0x9481;
    tft.begin(ID);
    tft.fillScreen(0x001F);
    tft.setTextColor(0xFFFF, 0x0000);
    bool good = SD.begin(SD_CS);
    if (!good) {
        Serial.print(F("cannot start SD"));
        while (1);
    }
    root = SD.open(namebuf);
    pathlen = strlen(namebuf);
}

Here is what i have so far…

#4 
}
if (buttonState3 == HIGH){
  #define NAMEMATCH "TrunkOpen"
    char *nm = namebuf + pathlen;
    File f = root.openNextFile();
    uint8_t ret;
    uint32_t start;
    if (f != NULL) {
#ifdef USE_SDFAT
        f.getName(nm, 32 - pathlen);
        Serial.print(f.getName(nm, 32 - pathlen));
#else
        strcpy(nm, (char *)f.name());
#endif
        f.close();
        strlwr(nm);
        if (strstr(nm, ".bmp") != NULL && strstr(nm, NAMEMATCH) != NULL) {
            Serial.print(namebuf);
            Serial.print(F(" - "));
            tft.fillScreen(0);
            start = millis();
            ret = showBMP(namebuf, 5, 5);
            switch (ret) {
                case 0:
                    Serial.print(millis() - start);
                    Serial.println(F("ms"));
                    delay(5000);
                    break;
                case 1:
                    Serial.println(F("bad position"));
                    break;
                case 2:
                    Serial.println(F("bad BMP ID"));
                    break;
                case 3:
                    Serial.println(F("wrong number of planes"));
                    break;
                case 4:
                    Serial.println(F("unsupported BMP format"));
                    break;
                case 5:
                    Serial.println(F("unsupported palette"));
                    break;
                default:
                    Serial.println(F("unknown"));
                    break;
            }
        }
    }
    else root.rewindDirectory();
}

and an example of one of my if statements.

#5