ESP8266 Community Forum

- Thu Dec 29, 2016 10:20 am #60087 This is my first post because I usually don't run into problems I cant find solutions for on this forum, so thanks for that community!


I'm trying to display images (monochrome bit map already converted to a unsigned_char_Array[]) on a 2 inch e paper using this image library function: "void ShowBitMap(unsigned_char_Array)". I have successfully tested it on the epaper by saving the image arrays in the sketch, but I end up running out of RAM (I think) because the ESP8266 crashes after I get up to 5 image Arrays saved. To solve this I have started playing with SPIFF as a way to save the image arrays so that I can have more than 4 images to choose from without crashing the code. I have successfully Serial.print the stored "image arrays" from SPIFF to confirm they are there the way I want them. Although the data was there, it comes out as a string and the function "void ShowBitMap(unsigned_char_Array)" doesn't accept strings, so I use "unsigned char* valChar = (unsigned char*) data.c_str()" to convert the strings from SPIFF into unsigned char arrays. I then input the newly converted unsigned char Arrays into the image library function with no compile errors. Sadly, the image doesn't ever render correctly when I upload the code.

below is what the image looks like as an array stored on the sketch when it works. The SPIFF string produces the exact same thing which I confirmed through serial.print, except I removed the header and braces. I also tried leaving the braces in to see if that would fix the problem, but again with no luck .

Has anyone done something similar? I am essentially trying to recreate exactly what you see below: unsigned char NOA_Logo[1548], from a string that is pulled from SPIFF.

function & array that work:

ShowBitMap(NOA_Logo);


unsigned char NOA_Logo[1548] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x9F, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x8F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x00,
0x00, 0x00, 0xFF, 0xFE, 0x00, 0x0F, 0x07, 0x00, 0x00, 0x00, 0x00, 0x3F, 0xFC, 0x00, 0x0F, 0x07,
0x00, 0x00, 0x00, 0x00, 0x1F, 0xF0, 0x00, 0x0F, 0x07, 0x00, 0x00, 0x00, 0x00, 0x07, 0xF0, 0x00,
0x0F, 0x07, 0x00, 0x00, 0x00, 0x00, 0x07, 0xF0, 0x3F, 0xFF, 0x07, 0x00, 0x00, 0x00, 0x00, 0x07,
0xE0, 0x7F, 0xFF, 0x07, 0x00, 0x00, 0x00, 0x00, 0x03, 0xE0, 0xFF, 0xFF, 0x07, 0x00, 0x00, 0x00,
0x00, 0x03, 0xE0, 0xFF, 0xFF, 0x07, 0x00, 0x00, 0x00, 0x00, 0x03, 0xE0, 0xFF, 0xFF, 0x07, 0x00,
0x00, 0x00, 0x00, 0x03, 0xE0, 0xFF, 0xFF, 0x07, 0x00, 0x00, 0x00, 0x08, 0x03, 0xE0, 0xFF, 0xFF,
0x07, 0xFF, 0xFF, 0xFF, 0xF8, 0x03, 0xE0, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xE0, 0x03, 0xE0,
0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0x80, 0x03, 0xE0, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFC, 0x00,
0x03, 0xE0, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xF0, 0x00, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF,
0x80, 0x00, 0x07, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFC, 0x00, 0x00, 0x07, 0xFF, 0xFF, 0xFF, 0x07,
0xFF, 0xE0, 0x00, 0x00, 0x07, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0x00, 0x00, 0x00, 0x0F, 0xFF, 0xFF,
0xFF, 0x07, 0xF0, 0x00, 0x00, 0x00, 0x7F, 0xFF, 0xFF, 0xFF, 0x07, 0xE0, 0x00, 0x00, 0x00, 0xFF,
0xFF, 0xFF, 0xFF, 0x07, 0xC0, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xC0, 0x00, 0x00,
0x0F, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xC0, 0x00, 0x00, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0x80,
0x00, 0x03, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0x80, 0x00, 0x1F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x07, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x0F, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0x07, 0x00, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x7F, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x00, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x00,
0x00, 0x00, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x00, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0xFF, 0x07,
0x00, 0x00, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0x80, 0x00, 0x00, 0x00, 0x03, 0xFF, 0xFF,
0xFF, 0x07, 0x80, 0x00, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0xC0, 0x00, 0x00, 0x00, 0x03,
0xFF, 0xFF, 0xFF, 0x07, 0xC0, 0x00, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0xE0, 0x00, 0x00,
0x00, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0xF8, 0x00, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xEF,
0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE0, 0x3F, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xE0, 0x07, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE0, 0x01, 0xFF, 0x07, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xE0, 0x00, 0x3F, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0x00, 0x1F, 0x07,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0x00, 0x1F, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x80,
0x0F, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0x0F, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFC, 0x0F, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE0, 0x0F, 0x07, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0x80, 0x0F, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFC, 0x00, 0x1F, 0x07, 0xFF,
0xF8, 0x00, 0x7F, 0xFF, 0xF0, 0x00, 0x1F, 0x07, 0xFF, 0xC0, 0x00, 0x1F, 0xFF, 0xE0, 0x00, 0x7F,
0x07, 0xFF, 0x00, 0x00, 0x07, 0xFF, 0xE0, 0x03, 0xFF, 0x07, 0xFE, 0x00, 0x00, 0x01, 0xFF, 0xE0,
0x0F, 0xFF, 0x07, 0xFC, 0x00, 0x00, 0x00, 0xFF, 0xE0, 0x7F, 0xFF, 0x07, 0xF0, 0x00, 0x00, 0x00,
0x7F, 0xE3, 0xFF, 0xFF, 0x07, 0xE0, 0x00, 0x00, 0x00, 0x3F, 0xFF, 0xFF, 0xFF, 0x07, 0xC0, 0x00,
0x00, 0x00, 0x0F, 0xFF, 0xFF, 0xFF, 0x07, 0xC0, 0x00, 0x00, 0x00, 0x07, 0xFF, 0xFF, 0xFF, 0x07,
0xC0, 0x00, 0x00, 0x00, 0x07, 0xFF, 0xFF, 0xFF, 0x07, 0x80, 0x00, 0x00, 0x00, 0x07, 0xFF, 0xFF,
0xFF, 0x07, 0x80, 0x03, 0xFF, 0x00, 0x07, 0xFF, 0xFF, 0xFF, 0x07, 0x80, 0x0F, 0xFF, 0xE0, 0x07,
0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x1F, 0xFF, 0xE0, 0x07, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x3F, 0xFF,
0xF0, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x7F, 0xFF, 0xF8, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0x00,
0x7F, 0xFF, 0xF8, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x7F, 0xFF, 0xF8, 0x03, 0xFF, 0xFF, 0xFF,
0x07, 0x00, 0x7F, 0xFF, 0xF8, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x7F, 0xFF, 0xF8, 0x03, 0xFF,
0xFF, 0xFF, 0x07, 0x00, 0x7F, 0xFF, 0xF8, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x7F, 0xFF, 0xF8,
0x03, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x7F, 0xFF, 0xF8, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x7F,
0xFF, 0xF8, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x7F, 0xFF, 0xF8, 0x03, 0xFF, 0xFF, 0xFF, 0x07,
0x00, 0x7F, 0xFF, 0xF8, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x7F, 0xFF, 0xF8, 0x03, 0xFF, 0xFF,
0xFF, 0x07, 0x00, 0x7F, 0xFF, 0xF8, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x7F, 0xFF, 0xF8, 0x03,
0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x3F, 0xFF, 0xF0, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x1F, 0xFF,
0xE0, 0x07, 0xFF, 0xFF, 0xFF, 0x07, 0x80, 0x0F, 0xFF, 0xE0, 0x07, 0xFF, 0xFF, 0xFF, 0x07, 0x80,
0x00, 0x00, 0x00, 0x07, 0xFF, 0xFF, 0xFF, 0x07, 0xC0, 0x00, 0x00, 0x00, 0x07, 0xFF, 0xFF, 0xFF,
0x07, 0xC0, 0x00, 0x00, 0x00, 0x07, 0xE0, 0x83, 0x0F, 0x07, 0xC0, 0x00, 0x00, 0x00, 0x0F, 0xE0,
0x83, 0x0F, 0x07, 0xC0, 0x00, 0x00, 0x00, 0x1F, 0xE0, 0x83, 0x0F, 0x07, 0xE0, 0x00, 0x00, 0x00,
0x1F, 0xE0, 0x83, 0x0F, 0x07, 0xF0, 0x00, 0x00, 0x00, 0x7F, 0xE0, 0x83, 0x0F, 0x07, 0xF8, 0x00,
0x00, 0x00, 0xFF, 0xE0, 0x83, 0x0F, 0x07, 0xFE, 0x00, 0x00, 0x00, 0xFF, 0xE0, 0x83, 0x0F, 0x07,
0xFF, 0xC0, 0x00, 0x0F, 0xFF, 0xE0, 0x83, 0x0F, 0x07, 0xFF, 0xF0, 0x00, 0x3F, 0xFF, 0xE0, 0x83,
0x0F, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE0, 0x83, 0x0F, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xE0, 0x82, 0x0F, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE0, 0x00, 0x0F, 0x07, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xE0, 0x00, 0x0F, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0x00, 0x1F, 0x07, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0x00, 0x1F, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFC, 0x38, 0x7F,
0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07,
0x1F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0x07, 0x00, 0x0F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x03, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x00, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x00, 0x1F,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0x00,
0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0x00, 0x00, 0x00, 0x1F, 0xFF, 0xFF, 0xFF, 0xFF,
0x07, 0x00, 0x00, 0x00, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xE0, 0x00, 0x00, 0x00, 0x7F, 0xFF,
0xFF, 0xFF, 0x07, 0xFC, 0x00, 0x00, 0x00, 0x1F, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0x00, 0x00, 0x00,
0x0F, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xE0, 0x00, 0x00, 0x07, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xF8,
0x00, 0x00, 0x07, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0x00, 0x00, 0x07, 0xFF, 0xFF, 0xFF, 0x07,
0xFF, 0xFF, 0xC0, 0x00, 0x07, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xF8, 0x00, 0x07, 0xFF, 0xFF,
0xFF, 0x07, 0xFF, 0xFF, 0xFE, 0x00, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xF0, 0x03,
0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xF0, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF,
0xC0, 0x03, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFE, 0x00, 0x03, 0xFF, 0xFC, 0xFF, 0x07, 0xFF,
0xFF, 0xF8, 0x00, 0x07, 0xF1, 0xF0, 0x3F, 0x07, 0xFF, 0xFF, 0xC0, 0x00, 0x07, 0xE0, 0xE0, 0x1F,
0x07, 0xFF, 0xFF, 0x00, 0x00, 0x07, 0xE0, 0xC0, 0x1F, 0x07, 0xFF, 0xF8, 0x00, 0x00, 0x07, 0xE0,
0x80, 0x0F, 0x07, 0xFF, 0x00, 0x00, 0x00, 0x0F, 0xE0, 0x82, 0x0F, 0x07, 0xFC, 0x00, 0x00, 0x00,
0x1F, 0xE0, 0x83, 0x0F, 0x07, 0xE0, 0x00, 0x00, 0x00, 0x7F, 0xE0, 0x83, 0x0F, 0x07, 0x80, 0x00,
0x00, 0x00, 0xFF, 0xE0, 0x83, 0x0F, 0x07, 0x00, 0x00, 0x00, 0x07, 0xFF, 0xE0, 0x83, 0x0F, 0x07,
0x00, 0x00, 0x00, 0x1F, 0xFF, 0xE0, 0x83, 0x0F, 0x07, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xE0, 0x83,
0x0F, 0x07, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0xE0, 0x03, 0x0F, 0x07, 0x00, 0x00, 0x1F, 0xFF, 0xFF,
0xF0, 0x03, 0x0F, 0x07, 0x00, 0x03, 0xFF, 0xFF, 0xFF, 0xF0, 0x07, 0x0F, 0x07, 0x00, 0x0F, 0xFF,
0xFF, 0xFF, 0xF0, 0x0F, 0x0F, 0x07, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFC, 0x1F, 0xFF, 0x07, 0x03,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0x1F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x0F, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x8F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
}

- Thu Dec 29, 2016 7:48 pm #60123 I will ask the same question with less context. how do I convert a string into an unsigned_char_array. The array needs to be an exact replica of the string. Since posting the original question, I have managed to print out the array and confirmed its containing junk.

[RichardS]

- Thu Dec 29, 2016 11:27 pm #60125 I think its:

Code: Select allString s;
char *p;

p = s.c_str();

Might have to cast for const or unsigned....

RichardS

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