HD44780 8-bit mode

[Fede]

Goodmorning all!

I don't know if it is useful to someone but this is the correct function that initialize the HD44780 in 8 bit mode:

(file: ugfx/drivers/tdisp/hd44780/tdisp_lld.c)

bool_t tdisp_lld_init(void) { 
	/* initialise hardware */
	init_board();

	/* The first part is the initialing code.
	 * In this part only the lower nibble of the
	 * byte is written directly to the display, thus
	 * without write_cmd, which sends both high and
	 * low nibble.
	 */

	/* Give the LCD a little time to wake up */
	gfxSleepMilliseconds(15);

	/* clear the RS-line to the display */
	palClearPad(PORT_CTRL, PIN_RS);
 	#if BUS_4BITS
		/* write three times 0x03 to display (4-bit mode only)
		* with RS = low.
		*/
		writeToLCD(0x03); // 1x
		gfxSleepMilliseconds(20);
		writeToLCD(0x03); // 2x
		writeToLCD(0x03); // 3x
		/* Put display in 4-bit mode by
		* write 0x02 to display.
		*/
		writeToLCD(0x02); // 4bit-modus
 	#else
		/* 8-bit modus, 2 lines en 5x7 characters */
		/* write three times 0x30 to display (8-bit mode only)
		* with RS = low.
		*/
 		writeToLCD(0x30); // 1x
 		gfxSleepMilliseconds(5);
 		writeToLCD(0x30); // 2x
 		writeToLCD(0x30); // 3x
 	#endif

	/* From this point on, the LCD accepts
	 * bytes sent with highnibbel first and than
	 *the lownibble if working in 4-bit mode.
	 * In 8-bit mode bytes are written in 1 action.
	  */


#if BUS_4BITS
	/* 4-bit modus, 2 lines en 5x7 characters */
	write_cmd(0x28);
	/* set display on, cursor off and no blinking */
	write_cmd(0x0C);
	/* set cursor increase and direction */
	write_cmd(0x06);
#else
	/* 8-bit modus, 2 lines en 5x7 characters */
	write_cmd(0x38);
	/* set display on, cursor off and no blinking */
	write_cmd(0x0C);
	/* set cursor increase and direction */
	write_cmd(0x06);
#endif

	displaycontrol = TDISP_DISPLAY_ON;
	cursorcontrol = TDISP_CURSOR_INC;
	/* END OF INITIALISATION */

	return TRUE;
}

bye,

Fede

[Joel Bodenmann]

Hello Fede,

Thank you very much for your contribution. However, the TDISP module has been removed a long time ago as it does not fit the projects goal (anymore).

~ Tectu