170 lines
5.0 KiB
C
170 lines
5.0 KiB
C
/*
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ChibiOS/GFX - Copyright (C) 2012, 2013
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Joel Bodenmann aka Tectu <joel@unormal.org>
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This file is part of ChibiOS/GFX.
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ChibiOS/GFX is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/GFX is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file drivers/tdisp/HD44780/tdisp_lld_board_st_stm32f4_discovery.h
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* @brief TDISP driver subsystem board interface for the HD44780 display
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*
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* @addtogroup TDISP
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* @{
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*/
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#ifndef _TDISP_LLD_BOARD_H
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#define _TDISP_LLD_BOARD_H
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/* Configure these to match the hardware connections on your board */
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#define BUS_4BITS TRUE
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/* Configure the bitoffset in the dataport so they match with the
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* hardware pins. An offset of 0 means bit0 stays at bit0 of the dataport.
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* If the offset is set to 3, bit0 of the nibble will be positioned at
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* bit3 of the hardware-port.
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*/
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#define hardware_offset 0
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/* The port where the data is sent to. In the
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* low-leveldriver het hardware_offset is taken
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* into account. If for example the hardware_offset
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* is set to 3, then de data will be sent to
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* PE3, PE4, PE5 en PE6, if the dataport where GPIOE.
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*/
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#define PORT_DATA GPIOE
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/* The port used to controle the controle lines of
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* the display.
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*/
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#define PORT_CTRL GPIOD
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/* Pin to controle the R/S-line of the display */
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#define PIN_RS 0
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/* Pin to controle the EN-line of the display */
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#define PIN_EN 1
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/* Pin to controle the R/W-pin of the display.
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* If reading of the display is not used disable
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* reading in the gfxconf.h and put a dummy value here
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* as it will not be used.
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*/
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#define PIN_RW 7
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#if TDISP_USE_BACKLIGHT
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/* PWM configuration structure. We use timer 4 channel 2 (orange LED on board). */
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static const PWMConfig pwmcfg = {
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1000000, /* 1 MHz PWM clock frequency. */
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100, /* PWM period is 100 cycles. */
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NULL,
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{
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{PWM_OUTPUT_ACTIVE_HIGH, NULL},
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{PWM_OUTPUT_ACTIVE_HIGH, NULL},
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{PWM_OUTPUT_ACTIVE_HIGH, NULL},
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{PWM_OUTPUT_ACTIVE_HIGH, NULL}
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},
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0
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};
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#endif
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/* Initializes the board.
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* If you are using a specific setup, than copy the boardfile to your
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* project directory and set in gfxconf.h that you are using a custom board file
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* The next thing you have to do is to initialize the hardware port(s) you
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* are using to communicate with the board.
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*/
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static void init_board(void) {
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/* Initialize the ports for data and controle-lines */
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palSetGroupMode(PORT_CTRL, PAL_WHOLE_PORT, 0, PAL_MODE_OUTPUT_PUSHPULL);
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palSetGroupMode(PORT_DATA, PAL_WHOLE_PORT, 0, PAL_MODE_OUTPUT_PUSHPULL);
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/* Set alle controle pins to low */
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palClearPad(PORT_CTRL, PIN_RS);
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palClearPad(PORT_CTRL, PIN_EN);
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#if TDISP_NEED_READ
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palClearPad(PORT_CTRL, PIN_RW);
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#endif
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#if TDISP_USE_BACKLIGHT
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/* Display backlight control */
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/* TIM4 is an alternate function 2 (AF2) */
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pwmStart(&PWMD4, &pwmcfg);
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palSetPadMode(GPIOD, 13, PAL_MODE_ALTERNATE(2));
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pwmEnableChannel(&PWMD4, 1, 100);
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#endif
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}
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/* This is the low-level routine for sending the bits
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* to the LCD-display. This routine shifts
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* the bits so they match the hardware port.
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*/
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static void writeToLCD(uint8_t data) {
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palWritePort(PORT_DATA, data);
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palSetPad(PORT_CTRL, PIN_EN);
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chThdSleepMicroseconds(5);
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// chThdSleepMilliseconds(10);
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palClearPad(PORT_CTRL, PIN_EN);
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chThdSleepMicroseconds(5);
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// chThdSleepMilliseconds(10);
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/* wait a little while so that de display can process the data */
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}
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/* Writes a command to the display. The
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* RS-line is pulled low and than the
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* data is send.
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*/
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static void write_cmd(uint8_t data) {
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palClearPad(PORT_CTRL, PIN_RS);
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#if BUS_4BITS
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/* first send the high-nibble */
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writeToLCD((data & 0xF0)>>4);
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/* in 4-bit mode the high-nibble is zeroed out */
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writeToLCD((data & 0x0F));
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#else
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writeToLCD(data);
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#endif
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}
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// static void write_initcmd(uint8_t data) {
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// write_cmd(data);
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// }
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/* Write data to the display. The
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* RS-line is pulled high and than the
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* data is send.
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*/
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static void write_data(uint8_t data) {
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palSetPad(PORT_CTRL, PIN_RS);
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#if BUS_4BITS
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/* first send the high-nibble */
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writeToLCD((data & 0xF0)>>4);
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/* in 4-bit mode the high-nibble is zeroed out */
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writeToLCD((data & 0x0F));
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#else
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writeToLCD(data);
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#endif
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}
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#if TDISP_USE_BACKLIGHT
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/* Sets the brightness of the backlight of the display, using
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* the PWM channel */
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static void set_backlight(uint16_t percentage) {
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pwmEnableChannel(&PWMD4, 1, percentage);
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}
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#endif
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#endif /* _TDISP_LLD_BOARD_H */
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/** @} */
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