Font encoder for MAX7129

fonts.py

# fonts are encoded by columns
# first value is the first column from the left

# now, we want to have them encode by rows (starting from the botton one)
# { 0x00, 0xf8, 0x88, 0x88, 0x88, 0x88, 0x88, 0xf8 }, // 0

# see https://github.com/rm-hull/luma.led_matrix/blob/0.2.3/max7219/font.py#L84-L93
CP437_FONT = [
    [0x3E, 0x7F, 0x71, 0x59, 0x4D, 0x7F, 0x3E, 0x00],  # '0'
    [0x40, 0x42, 0x7F, 0x7F, 0x40, 0x40, 0x00, 0x00],  # '1'
    [0x62, 0x73, 0x59, 0x49, 0x6F, 0x66, 0x00, 0x00],  # '2'
    [0x22, 0x63, 0x49, 0x49, 0x7F, 0x36, 0x00, 0x00],  # '3'
    [0x18, 0x1C, 0x16, 0x53, 0x7F, 0x7F, 0x50, 0x00],  # '4'
    [0x27, 0x67, 0x45, 0x45, 0x7D, 0x39, 0x00, 0x00],  # '5'
    [0x3C, 0x7E, 0x4B, 0x49, 0x79, 0x30, 0x00, 0x00],  # '6'
    [0x03, 0x03, 0x71, 0x79, 0x0F, 0x07, 0x00, 0x00],  # '7'
    [0x36, 0x7F, 0x49, 0x49, 0x7F, 0x36, 0x00, 0x00],  # '8'
    [0x06, 0x4F, 0x49, 0x69, 0x3F, 0x1E, 0x00, 0x00],  # '9'
];

# rotate clockwise, 90-deg
for i, columns in enumerate(CP437_FONT):
	entry = [0] * 8;

	# rows are numbered from the bottom to the top
	for row in range(0, 8):
		# bits are numbered from the left side of the 8x8 led segment
		for bit in range(0, 8):
			# which bit to take from the CP437_FONT?
			if columns[bit] & (1 << row):
				entry[7-row] |= 1 << bit

	print('  { ', end='')
	print(', '.join(map(lambda i: '0x%02x' % i, entry)), end='')
	print(f' }}, // {i}')