#!/usr/bin/env python VERSION_STRING = '0.01' import os import sys try: import PIL, PIL.Image, PIL.ImageOps except ImportError,error: raise ImportError, "%s: %s requres Python Imaging Library (PIL). " \ "Install with `pip` or OS-specific package " \ "management tool." \ % (error, sys.argv[0]) LCD_WIDTH = 96 LCD_HEIGHT = 16 LCD_NUM_BYTES = LCD_WIDTH * LCD_HEIGHT / 8 LCD_PADDED_SIZE = 1024 INTELHEX_DATA_RECORD = 0x00 INTELHEX_END_OF_FILE_RECORD = 0x01 INTELHEX_EXTENDED_LINEAR_ADDRESS_RECORD = 0x04 INTELHEX_BYTES_PER_LINE = 16 INTELHEX_MINIMUM_SIZE = 4096 def split16(word): '''return high and low byte of 16-bit word value as tuple''' return ((word >> 8) & 0xff, word & 0xff) def intel_hex_line(file, record_type, offset, data): '''write a line of data in Intel hex format''' # length, address offset, record type record_length = len(data) file.write(':%02X%04X%02X' % (record_length, offset, record_type)) # data map(lambda byte: file.write("%02X" % byte), data) # compute and write checksum (with DOS line ending for compatibility/safety) file.write( "%02X\r\n" % ( ( ( sum(data, # sum data ... record_length # ... and other ... + sum(split16(offset)) # ... fields ... + record_type) # ... on line & 0xff) # low 8 bits ^ 0xff) # two's ... + 1)) # ... complement def intel_hex(file, bytes, start_address = 0x0): '''write block of data in Intel hex format''' if len(bytes) % INTELHEX_BYTES_PER_LINE != 0: raise ValueError, \ "Program error: Size of LCD data is not evenly divisible by %s" \ % INTELHEX_BYTES_PER_LINE address_lo = start_address & 0xffff address_hi = (start_address >> 16) & 0xffff intel_hex_line(file, INTELHEX_EXTENDED_LINEAR_ADDRESS_RECORD, 0, split16(address_hi)) size_written = 0 while size_written < INTELHEX_MINIMUM_SIZE: offset = address_lo for line_start in range(0, len(bytes), INTELHEX_BYTES_PER_LINE): intel_hex_line(file, INTELHEX_DATA_RECORD, offset, bytes[line_start:line_start+INTELHEX_BYTES_PER_LINE]) size_written += INTELHEX_BYTES_PER_LINE if size_written >= INTELHEX_MINIMUM_SIZE: break offset += INTELHEX_BYTES_PER_LINE intel_hex_line(file, INTELHEX_END_OF_FILE_RECORD, 0, ()) def img2hex(input_filename, output_file, preview_filename=None, threshold=128, dither=False, negative=False): ''' Convert 'input_filename' image file into Intel hex format with data formatted for display on TS100 LCD and file object. Input image is converted from color or grayscale to black-and-white, and resized to fit TS100 LCD screen as necessary. Optionally write resized/thresholded/black-and-white preview image to file specified by name. Optional `threshold' argument 8 bit value; grayscale pixels greater than this become 1 (white) in output, less than become 0 (black). Unless optional `dither', in which case PIL grayscale-to-black/white dithering algorithm used. Optional `negative' inverts black/white regardless of input image type or other options. ''' try: image = PIL.Image.open(input_filename) except BaseException,error: raise IOError, \ "error reading image file \"%s\": %s" % (input_filename, error) # convert to luminance # do even if already black/white because PIL can't invert 1-bit so # can't just pass thru in case --negative flag # also resizing works better in luminance than black/white # also no information loss converting black/white to grayscale if image.mode != 'L': image = image.convert('L') if image.size != (LCD_WIDTH, LCD_HEIGHT): image = image.resize((LCD_WIDTH, LCD_HEIGHT), PIL.Image.BICUBIC) if negative: image = PIL.ImageOps.invert(image) threshold = 255 - threshold # have to invert threshold if dither: image = image.convert('1') else: image = image.point(lambda pixel: 0 if pixel < threshold else 1, '1') if preview_filename: image.save(preview_filename) ''' DEBUG for row in range(LCD_HEIGHT): for column in range(LCD_WIDTH): if image.getpixel((column, row)): sys.stderr.write('1') else: sys.stderr.write('0') sys.stderr.write('\n') ''' # pad to this size (also will be repeated in output Intel hex file) data = [0] * LCD_PADDED_SIZE # magic/undocumented/required header in endian-reverse byte order data[0] = 0x55 data[1] = 0xAA data[2] = 0x0D data[3] = 0xF0 # convert to TS100 LCD format for ndx in range(LCD_WIDTH * 16 / 8): bottom_half_offset = 0 if ndx < LCD_WIDTH else 8 byte = 0 for y in range(8): if image.getpixel((ndx % LCD_WIDTH, y + bottom_half_offset)): byte |= 1 << y # store in endian-reversed byte order data[4 + ndx + (1 if ndx % 2 == 0 else -1)] = byte intel_hex(output_file, data, 0x0800B800) def parse_commandline(): parser = argparse.ArgumentParser( formatter_class=argparse.ArgumentDefaultsHelpFormatter, description="Convert image file for display on TS100 LCD " "at startup") def zero_to_255(text): try: value = int(text) assert(value >= 0 and value <= 255) except: raise argparse.ArgumentTypeError("must be integer from 0 to 255 ") return value parser.add_argument('input_filename', help="input image file") parser.add_argument('output_filename', help="output Intel hex file") parser.add_argument('-p', '--preview', help="filename of image preview (same data as " "Intel hex file, as will appear on TS100 LCD)") parser.add_argument('-n', '--negative', action='store_true', help="photo negative: exchange black and white " "in output") parser.add_argument('-t', '--threshold', type=zero_to_255, default=128, help="0 to 255: gray (or color converted to gray) " "above this becomes white, below becomes black; " "ignored if using --dither") parser.add_argument('-d', '--dither', action='store_true', help="use dithering (speckling) to convert gray or " "color to black and white") parser.add_argument('-f', '--force', action='store_true', help="force overwriting of existing files") parser.add_argument('-v', '--version', action='version', version="%(prog)s version " + VERSION_STRING, help="print version info") return parser.parse_args() if __name__ == "__main__": import argparse args = parse_commandline() if os.path.exists(args.output_filename) and not args.force: sys.stderr.write( "Won't overwrite existing file \"%s\" (use --force " "option to override)\n" % args.output_filename) sys.exit(1) if args.preview and os.path.exists(args.preview) and not args.force: sys.stderr.write( "Won't overwrite existing file \"%s\" (use --force " "option to override)\n" % args.preview) sys.exit(1) try: with open(args.output_filename, 'w') as output_file: img2hex(args.input_filename, output_file, args.preview, args.threshold, args.dither, args.negative) except BaseException,error: sys.stderr.write("Error converting file: %s\n" % error) sys.exit(1)