mirror of https://github.com/marqs85/ossc.git
109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
//
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// Copyright (C) 2015 Markus Hiienkari <mhiienka@niksula.hut.fi>
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//
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// This file is part of Open Source Scan Converter project.
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//
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// This program 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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//
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// This program 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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//
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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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#include "lcd.h"
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#include "alt_types.h"
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#include "altera_avalon_pio_regs.h"
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#define LCD_CMD 0x00
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#define LCD_DATA 0x40
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#define WRDELAY 20
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#define CLEARDELAY 800
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void lcd_init() {
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alt_u8 lcd_ctrl = 0x00;
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_5_BASE, lcd_ctrl);
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usleep(WRDELAY);
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SPI_write(I2CA_BASE, 0x38); // function set
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usleep(WRDELAY);
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SPI_write(I2CA_BASE, 0x39); // function set, select extended table (IS=1)
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usleep(WRDELAY);
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SPI_write(I2CA_BASE, 0x14); // osc freq
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usleep(WRDELAY);
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SPI_write(I2CA_BASE, 0x71); // contrast set
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usleep(WRDELAY);
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SPI_write(I2CA_BASE, 0x5E); // power/icon/cont
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usleep(WRDELAY);
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SPI_write(I2CA_BASE, 0x6D); // follower control
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usleep(WRDELAY);
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SPI_write(I2CA_BASE, 0x0C); // display on
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usleep(WRDELAY);
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SPI_write(I2CA_BASE, 0x01); // clear display
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usleep(CLEARDELAY);
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SPI_write(I2CA_BASE, 0x06); // entry mode set
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usleep(WRDELAY);
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SPI_write(I2CA_BASE, 0x02); // return home
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usleep(CLEARDELAY);
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lcd_ctrl |= LCD_CS_N;
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_5_BASE, lcd_ctrl);
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}
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void lcd_write(char *row1, char *row2) {
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alt_u8 i, rowlen;
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alt_u8 lcd_ctrl = 0x00;
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_5_BASE, lcd_ctrl);
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SPI_write(I2CA_BASE, 0x01); // clear display
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usleep(CLEARDELAY);
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// Set RS to enter data write mode
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lcd_ctrl |= LCD_RS;
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_5_BASE, lcd_ctrl);
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//ensure no empty row
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rowlen = strnlen(row1, LCD_ROW_LEN);
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if (rowlen == 0) {
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strncpy(row1, " ", LCD_ROW_LEN+1);
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rowlen++;
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}
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for (i=0; i<rowlen; i++) {
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SPI_write(I2CA_BASE, row1[i]);
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usleep(WRDELAY);
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}
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// second row
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lcd_ctrl &= ~LCD_RS;
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_5_BASE, lcd_ctrl);
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SPI_write(I2CA_BASE, (1<<7)|0x40);
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usleep(WRDELAY);
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lcd_ctrl |= LCD_RS;
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_5_BASE, lcd_ctrl);
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//ensure no empty row
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rowlen = strnlen(row2, LCD_ROW_LEN);
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if (rowlen == 0) {
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strncpy(row2, " ", LCD_ROW_LEN+1);
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rowlen++;
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}
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for (i=0; i<rowlen; i++) {
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SPI_write(I2CA_BASE, row2[i]);
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usleep(WRDELAY);
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}
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lcd_ctrl |= LCD_CS_N;
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IOWR_ALTERA_AVALON_PIO_DATA(PIO_5_BASE, lcd_ctrl);
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}
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