stm8s/README.md

STM8S003 firmware for the I²C to HD44780 adapter.

I²C commands (first byte).

simplified commands:

• 0x0 INIT: initialize LCD, as 2-line, 5x8 dots, no blinking or cursor
• 0x1 LINE1: write to line 1, followed by ASCII text
• 0x2 LINE2: write to line 2, followed by ASCII text
• 0x3 DISPLAY_ON: turn display on
• 0x4 DISPLAY_OFF: turn display off
• 0x5 BRIGHTNESS: set backlight brightness, followed by 0-255 value

raw instructions, directly mapping to HD44780, followed by instruction byte or data bytes if applicable:

• 0x6 CLEAR_DISPLAY
• 0x7 RETURN_HOME
• 0x8 ENTRY_MODE_SET
• 0x9 DISPLAY
• 0xa CURSOR_DISPLAY_SHIFT
• 0xb FUNCTION_SET
• 0xc CGRAM_ADDR
• 0xd DDRAM_ADDR
• 0xe DATA