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/**
* @file lcd.c
* A basic library for writing a 16x2 text LCD.
*
* Copyright (C) 2018 Clyne Sullivan
*
* This program 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.
*
* This program 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 <https://www.gnu.org/licenses/>.
*/
#include <lcd.h>
#include <clock.h>
#include <gpio.h>
#include <string.h>
//#define USE_DELAY
#define LCD_D0 GPIO_PORT(A, 0)
#define LCD_D1 GPIO_PORT(A, 1)
#define LCD_D2 GPIO_PORT(A, 4)
#define LCD_D3 GPIO_PORT(B, 0)
#define LCD_D4 GPIO_PORT(C, 1)
#define LCD_D5 GPIO_PORT(C, 0)
#define LCD_D6 GPIO_PORT(C, 2)
#define LCD_D7 GPIO_PORT(C, 3)
#define LCD_E GPIO_PORT(C, 12)
#define LCD_RS GPIO_PORT(C, 10)
#define lcd_data() gpio_dout(LCD_RS, 1)
void lcd_pulse(void)
{
gpio_dout(LCD_E, 1);
#ifdef USE_DELAY
delay(1);
#else
for (uint16_t i = 0; i < 10000; i++)
asm("");
#endif // USE_DELAY
gpio_dout(LCD_E, 0);
}
void lcd_byte(uint8_t byte)
{
gpio_dout(LCD_D0, byte & 0x01);
gpio_dout(LCD_D1, byte & 0x02);
gpio_dout(LCD_D2, byte & 0x04);
gpio_dout(LCD_D3, byte & 0x08);
gpio_dout(LCD_D4, byte & 0x10);
gpio_dout(LCD_D5, byte & 0x20);
gpio_dout(LCD_D6, byte & 0x40);
gpio_dout(LCD_D7, byte & 0x80);
}
void lcd_cmd(uint8_t cmd)
{
gpio_dout(LCD_RS, 0);
lcd_byte(cmd);
lcd_pulse();
}
void lcd_putchar(int c)
{
lcd_data();
lcd_byte((uint8_t)c);
lcd_pulse();
}
static int lcd_index = 0;
void lcd_puts(const char *s)
{
lcd_cmd(0x06);
while (*s) {
lcd_putchar(*s++);
if (++lcd_index == 0x10) {
lcd_cmd(0x80 | 0x40);
} else if (lcd_index == 0x20) {
lcd_cmd(0x80);
lcd_index = 0;
}
}
}
extern char *itoa(int n, int base);
void lcd_puti(int i)
{
lcd_puts(itoa(i, 10));
}
void lcd_puth(int h)
{
lcd_puts(itoa(h, 16));
}
void lcd_putb(uint8_t b)
{
lcd_puts(itoa(b, 2));
}
void lcd_clear(void)
{
lcd_cmd(0x01);
delay(2);
lcd_index = 0;
}
void lcd_init(void)
{
gpio_mode(LCD_D0, OUTPUT);
gpio_mode(LCD_D1, OUTPUT);
gpio_mode(LCD_D2, OUTPUT);
gpio_mode(LCD_D3, OUTPUT);
gpio_mode(LCD_D4, OUTPUT);
gpio_mode(LCD_D5, OUTPUT);
gpio_mode(LCD_D6, OUTPUT);
gpio_mode(LCD_D7, OUTPUT);
gpio_mode(LCD_E, OUTPUT);
gpio_mode(LCD_RS, OUTPUT);
gpio_dout(LCD_D0, 0);
gpio_dout(LCD_D1, 0);
gpio_dout(LCD_D2, 0);
gpio_dout(LCD_D3, 0);
gpio_dout(LCD_D4, 0);
gpio_dout(LCD_D5, 0);
gpio_dout(LCD_D6, 0);
gpio_dout(LCD_D7, 0);
gpio_dout(LCD_E, 0);
gpio_dout(LCD_RS, 0);
lcd_cmd(0x38);
lcd_cmd(0x10);
lcd_cmd(0x0D);
delay(5);
lcd_clear();
}
/**
* Task code
*/
volatile int bufpos = 0;
volatile char buf[32];
volatile uint8_t using = 0;
void lcd_clearbuf(void)
{
bufpos = 0;
for (int i = 0; i < 32; i++)
buf[i] = 0;
}
void lcd_put(const char *s)
{
int len = strlen(s);
int i;
using = 1;
for (i = 0; i < len; bufpos++, i++) {
if (bufpos > 31)
bufpos = 0;
buf[bufpos] = s[i];
}
using = 0;
}
void lcd_handler(void)
{
lcd_init();
lcd_clearbuf();
while (1) {
if (!using && buf[0] != '\0') {
lcd_puts(buf);
lcd_clearbuf();
}
delay(100);
}
}
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