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/*
* This source code form is a part of the ChibiOS/GFX project and stands
* under the terms of the GFX License v1.0. If a copy of the license
* was not distributed with this file, You can obtain one at:
*
* http://chibios-gfx.com/license.html
*
*/
/*
ChibiOS/GFX - Copyright (C) 2012, 2013
Joel Bodenmann aka Tectu <joel@unormal.org>
This file is part of ChibiOS/GFX.
ChibiOS/GFX is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/GFX is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file drivers/tdisp/HD44780/tdisp_lld_board_st_stm32f4_discovery.h
* @brief TDISP driver subsystem board interface for the HD44780 display
*
* @addtogroup TDISP
* @{
*/
#ifndef _TDISP_LLD_BOARD_H
#define _TDISP_LLD_BOARD_H
/* Configure these to match the hardware connections on your board */
#define BUS_4BITS TRUE
/* Configure the bitoffset in the dataport so they match with the
* hardware pins. An offset of 0 means bit0 stays at bit0 of the dataport.
* If the offset is set to 3, bit0 of the nibble will be positioned at
* P[A..G]3 of the hardware-port.
*/
#define hardware_offset 3
/* The port where the data is sent to. In the
* low-leveldriver het hardware_offset is taken
* into account. If for example the hardware_offset
* is set to 3, then de data will be sent to
* PE3, PE4, PE5 en PE6, if the dataport where GPIOE.
*/
#define PORT_DATA GPIOE
/* The port used to controle the controle lines of
* the display.
*/
#define PORT_CTRL GPIOD
/* Pin to controle the R/S-line of the display */
#define PIN_RS 0
/* Pin to controle the EN-line of the display */
#define PIN_EN 1
/* Pin to controle the R/W-pin of the display.
* If reading of the display is not used disable
* reading in the gfxconf.h and put a dummy value here
* as it will not be used.
*/
#define PIN_RW 7
static void init_board(void) {
/* Initialize the ports for data and controle-lines */
palSetGroupMode(PORT_CTRL, PAL_WHOLE_PORT, 0, PAL_MODE_OUTPUT_PUSHPULL);
palSetGroupMode(PORT_DATA, PAL_WHOLE_PORT, 0, PAL_MODE_OUTPUT_PUSHPULL);
/* Set alle controle pins to low */
palClearPad(PORT_CTRL, PIN_RS);
palClearPad(PORT_CTRL, PIN_EN);
#if TDISP_NEED_READ
palClearPad(PORT_CTRL, PIN_RW);
#endif
}
/* This is the low-level routine for sending the bits
* to the LCD-display. This routine shifts
* the bits so they match the hardware port.
*/
static void writeToLCD(uint8_t data) {
palWritePort(PORT_DATA, data<<hardware_offset);
palSetPad(PORT_CTRL, PIN_EN);
chThdSleepMicroseconds(1);
palClearPad(PORT_CTRL, PIN_EN);
/* wait a little while so that de display can process the data */
chThdSleepMicroseconds(5);
}
/* Writes a command to the display. The
* RS-line is pulled low and than the
* data is send.
*/
static void write_cmd(uint8_t data) {
palClearPad(PORT_CTRL, PIN_RS);
#if BUS_4BITS
/* first send the high-nibble */
writeToLCD(data>>4);
#endif
/* send the low-nibble */
#if BUS_4BITS
/* in 4-bit mode the high-nibble is zeroed out */
writeToLCD(data & 0x0F);
#else
writeToLCD(data);
#endif
}
// static void write_initcmd(uint8_t data) {
// write_cmd(data);
// }
/* Write data to the display. The
* RS-line is pulled high and than the
* data is send.
*/
static void write_data(uint8_t data) {
palSetPad(PORT_CTRL, PIN_RS);
#if BUS_4BITS
/* first send the high-nibble */
writeToLCD(data>>4);
#endif
/* send the low-nibble */
#if BUS_4BITS
/* in 4-bit mode the high-nibble is zeroed out */
writeToLCD(data & 0x0F);
#else
writeToLCD(data);
#endif
}
#endif /* _TDISP_LLD_BOARD_H */
/** @} */
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