98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "ch.h"
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#include "hal.h"
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#include "lcd.h"
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static void e_pulse(void) {
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volatile uint8_t i;
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PORTC |= PORTC_44780_E_MASK;
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for (i = 0; i < ELOOPVALUE; i++);
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;
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PORTC &= ~PORTC_44780_E_MASK;
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}
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static void wait_not_busy(void) {
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chThdSleep(2);
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}
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/*
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* 44780 soft reset procedure.
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*/
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void lcdInit(void) {
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PORTC = (PORTC & ~(PORTC_44780_DATA_MASK | PORTC_44780_RS_MASK |
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PORTC_44780_E_MASK | PORTC_44780_RW_MASK)) |
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(LCD_CMD_INIT8 & PORTC_44780_DATA_MASK);
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chThdSleep(50);
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e_pulse();
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chThdSleep(10);
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e_pulse();
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chThdSleep(2);
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e_pulse();
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wait_not_busy();
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PORTC = (PORTC & ~(PORTC_44780_DATA_MASK | PORTC_44780_RS_MASK |
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PORTC_44780_E_MASK | PORTC_44780_RW_MASK)) |
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(LCD_CMD_INIT4 & PORTC_44780_DATA_MASK);
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e_pulse();
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lcdCmd(LCD_CMD_INIT4);
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lcdCmd(LCD_SET_DM | LCD_DM_DISPLAY_ON);
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lcdCmd(LCD_SET_INCREMENT_MODE);
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}
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/*
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* Sends a command byte to the 44780.
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*/
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void lcdCmd(uint8_t cmd) {
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wait_not_busy();
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PORTC = (PORTC | PORTC_44780_DATA_MASK) & (cmd |
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(0x0F & ~PORTC_44780_RS_MASK));
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e_pulse();
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PORTC = (PORTC | PORTC_44780_DATA_MASK) & ((cmd << 4) |
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(0x0F & ~PORTC_44780_RS_MASK));
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e_pulse();
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}
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/*
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* Writes a char on the LCD at the current position.
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*/
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void lcdPutc(char c) {
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uint8_t b;
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wait_not_busy();
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b = c | 0x0F;
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PORTC = (PORTC | PORTC_44780_DATA_MASK | PORTC_44780_RS_MASK) &
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(c | 0x0F);
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e_pulse();
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PORTC = (PORTC | PORTC_44780_DATA_MASK | PORTC_44780_RS_MASK) &
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((c << 4) | 0x0F);
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e_pulse();
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}
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/*
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* Writes a string on the LCD at an absolute address.
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*/
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void lcdPuts(uint8_t pos, char *p) {
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lcdCmd(LCD_SET_DDRAM_ADDRESS | pos);
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while (*p)
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lcdPutc(*p++);
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}
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