123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/*
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* This file is subject to the terms of the GFX License. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://ugfx.org/license.html
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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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* P[A..G]3 of the hardware-port.
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*/
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#define hardware_offset 3
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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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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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}
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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<<hardware_offset);
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palSetPad(PORT_CTRL, PIN_EN);
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gfxSleepMicroseconds(1);
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palClearPad(PORT_CTRL, PIN_EN);
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/* wait a little while so that de display can process the data */
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gfxSleepMicroseconds(5);
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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>>4);
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#endif
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/* send the low-nibble */
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#if BUS_4BITS
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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>>4);
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#endif
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/* send the low-nibble */
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#if BUS_4BITS
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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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#endif /* _TDISP_LLD_BOARD_H */
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/** @} */
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