mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-23 16:37:43 +00:00
98 lines
2.5 KiB
C
Executable File
98 lines
2.5 KiB
C
Executable File
/*
|
|
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
#include "ch.h"
|
|
#include "hal.h"
|
|
#include "lcd.h"
|
|
|
|
static void e_pulse(void) {
|
|
volatile uint8_t i;
|
|
|
|
PORTC |= PORTC_44780_E_MASK;
|
|
for (i = 0; i < ELOOPVALUE; i++);
|
|
;
|
|
PORTC &= ~PORTC_44780_E_MASK;
|
|
}
|
|
|
|
static void wait_not_busy(void) {
|
|
|
|
chThdSleep(2);
|
|
}
|
|
|
|
/*
|
|
* 44780 soft reset procedure.
|
|
*/
|
|
void lcdInit(void) {
|
|
|
|
PORTC = (PORTC & ~(PORTC_44780_DATA_MASK | PORTC_44780_RS_MASK |
|
|
PORTC_44780_E_MASK | PORTC_44780_RW_MASK)) |
|
|
(LCD_CMD_INIT8 & PORTC_44780_DATA_MASK);
|
|
chThdSleep(50);
|
|
e_pulse();
|
|
chThdSleep(10);
|
|
e_pulse();
|
|
chThdSleep(2);
|
|
e_pulse();
|
|
wait_not_busy();
|
|
PORTC = (PORTC & ~(PORTC_44780_DATA_MASK | PORTC_44780_RS_MASK |
|
|
PORTC_44780_E_MASK | PORTC_44780_RW_MASK)) |
|
|
(LCD_CMD_INIT4 & PORTC_44780_DATA_MASK);
|
|
e_pulse();
|
|
lcdCmd(LCD_CMD_INIT4);
|
|
lcdCmd(LCD_SET_DM | LCD_DM_DISPLAY_ON);
|
|
lcdCmd(LCD_SET_INCREMENT_MODE);
|
|
}
|
|
|
|
/*
|
|
* Sends a command byte to the 44780.
|
|
*/
|
|
void lcdCmd(uint8_t cmd) {
|
|
|
|
wait_not_busy();
|
|
PORTC = (PORTC | PORTC_44780_DATA_MASK) & (cmd |
|
|
(0x0F & ~PORTC_44780_RS_MASK));
|
|
e_pulse();
|
|
PORTC = (PORTC | PORTC_44780_DATA_MASK) & ((cmd << 4) |
|
|
(0x0F & ~PORTC_44780_RS_MASK));
|
|
e_pulse();
|
|
}
|
|
|
|
/*
|
|
* Writes a char on the LCD at the current position.
|
|
*/
|
|
void lcdPutc(char c) {
|
|
uint8_t b;
|
|
|
|
wait_not_busy();
|
|
b = c | 0x0F;
|
|
PORTC = (PORTC | PORTC_44780_DATA_MASK | PORTC_44780_RS_MASK) &
|
|
(c | 0x0F);
|
|
e_pulse();
|
|
PORTC = (PORTC | PORTC_44780_DATA_MASK | PORTC_44780_RS_MASK) &
|
|
((c << 4) | 0x0F);
|
|
e_pulse();
|
|
}
|
|
|
|
/*
|
|
* Writes a string on the LCD at an absolute address.
|
|
*/
|
|
void lcdPuts(uint8_t pos, char *p) {
|
|
|
|
lcdCmd(LCD_SET_DDRAM_ADDRESS | pos);
|
|
while (*p)
|
|
lcdPutc(*p++);
|
|
}
|