ugfx/demos/3rdparty/tdisp_f4_discovery/tdisp_lld_board.h
Joel Bodenmann ebc30c02bc TDISP update
2013-06-01 01:37:53 +02:00

170 lines
5.0 KiB
C

/*
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
* bit3 of the hardware-port.
*/
#define hardware_offset 0
/* 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
#if TDISP_USE_BACKLIGHT
/* PWM configuration structure. We use timer 4 channel 2 (orange LED on board). */
static const PWMConfig pwmcfg = {
1000000, /* 1 MHz PWM clock frequency. */
100, /* PWM period is 100 cycles. */
NULL,
{
{PWM_OUTPUT_ACTIVE_HIGH, NULL},
{PWM_OUTPUT_ACTIVE_HIGH, NULL},
{PWM_OUTPUT_ACTIVE_HIGH, NULL},
{PWM_OUTPUT_ACTIVE_HIGH, NULL}
},
0
};
#endif
/* Initializes the board.
* If you are using a specific setup, than copy the boardfile to your
* project directory and set in gfxconf.h that you are using a custom board file
* The next thing you have to do is to initialize the hardware port(s) you
* are using to communicate with the board.
*/
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
#if TDISP_USE_BACKLIGHT
/* Display backlight control */
/* TIM4 is an alternate function 2 (AF2) */
pwmStart(&PWMD4, &pwmcfg);
palSetPadMode(GPIOD, 13, PAL_MODE_ALTERNATE(2));
pwmEnableChannel(&PWMD4, 1, 100);
#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);
palSetPad(PORT_CTRL, PIN_EN);
chThdSleepMicroseconds(5);
// chThdSleepMilliseconds(10);
palClearPad(PORT_CTRL, PIN_EN);
chThdSleepMicroseconds(5);
// chThdSleepMilliseconds(10);
/* wait a little while so that de display can process the data */
}
/* 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 & 0xF0)>>4);
/* 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 & 0xF0)>>4);
/* in 4-bit mode the high-nibble is zeroed out */
writeToLCD((data & 0x0F));
#else
writeToLCD(data);
#endif
}
#if TDISP_USE_BACKLIGHT
/* Sets the brightness of the backlight of the display, using
* the PWM channel */
static void set_backlight(uint16_t percentage) {
pwmEnableChannel(&PWMD4, 1, percentage);
}
#endif
#endif /* _TDISP_LLD_BOARD_H */
/** @} */