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lcd.c
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lcd.c
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#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <util/delay.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <stdio.h>
#include "config.h"
#include "twi.h"
#include "lcd.h"
#include "input.h"
#ifdef USE_LCD
#define LCD_ADDR 0x3E
#define LCD_CONF (LCD_8BITMODE | LCD_1LINE | LCD_2LINE | LCD_5x8DOTS)
static uint8_t _lcd_basic = LCD_INSTRUCTION_SET_BASIC | LCD_CONF;
static uint8_t _lcd_extended = LCD_INSTRUCTION_SET_EXTENDED | LCD_CONF;
extern uint32_t millis;
static void lcd_send(uint8_t value, uint8_t mode) {
twi_write_reg(LCD_ADDR, mode, value);
_delay_us(30);
}
static void lcd_cmd(uint8_t cmd) {
lcd_send(cmd, 0x00);
}
static void lcd_data(uint8_t data) {
lcd_send(data, 0x40);
}
static void lcd_create_char(uint8_t slot, uint8_t map[]) {
slot &= 0x7;
lcd_cmd(LCD_SETCGRAMADDR | (slot << 3));
for (uint8_t i=0; i<8; i++) {
lcd_write(map[i]);
}
}
#ifdef LCD_SHOW_CHANNELS
static void lcd_load_bargraph(void) {
uint8_t graph[8];
memset(graph, 0, 8);
/* we only generate bars for 2-6
* since 0 and 1 are free lunch
* (line 7 is the cursor)
*/
graph[6] = 0xFF;
for (uint8_t i=2; i<7; i++) {
graph[7-i] = 0xFF;
lcd_create_char(i, graph);
}
}
char lcd_get_bargraph(uint8_t i) {
switch (i) {
case 0:
return ' ';
case 1:
return '_';
}
return i & 0x7;
}
#endif
void lcd_load_icons(void) {
uint8_t clock[8] = {0x0,0xe,0x15,0x17,0x11,0xe,0x0};
lcd_create_char(0, clock);
}
#ifdef LCD_SHOW_CROSSHAIRS
void lcd_create_crosshair(isrc_t xd, isrc_t yd, uint8_t slot) {
uint8_t x = get_input_scaled(xd, 4, 0);
uint8_t y = get_input_scaled(yd, 7, 0);
uint8_t g[8];
memset(g, (1<<(x)), sizeof(g));
g[y] ^= 0xFF;
lcd_create_char(slot, g);
}
/* create bargraph on the fly */
void lcd_create_bargraph(isrc_t bd, uint8_t slot) {
uint8_t g[8];
uint8_t y = get_input_scaled(bd, 0, sizeof(g)-1);
memset(g, 0xFF, sizeof(g));
memset(g, 0x00, 7-y);
lcd_create_char(slot, g);
}
#endif
void lcd_init(void) {
uint16_t contrast = 0x0A;
lcd_cmd(LCD_FUNCTIONSET | _lcd_basic);
lcd_cmd(LCD_FUNCTIONSET | _lcd_extended);
lcd_cmd(LCD_BIAS_OSC_CONTROL | LCD_BIAS1_4 | LCD_OSC_347);
lcd_cmd(LCD_CONTRAST_LOW_BYTE | (contrast & LCD_CONTRAST_LOW_BYTE_MASK));
lcd_cmd(LCD_ICON_CONTRAST_HIGH_BYTE | LCD_ICON_ON | LCD_BOOSTER_ON | (contrast >> 4 & LCD_CONTRAST_HIGH_BYTE_MASK));
lcd_cmd(LCD_FOLLOWER_CONTROL | LCD_FOLLOWER_ON | LCD_Rab_2_00);
_delay_ms(250);
lcd_cmd(LCD_FUNCTIONSET | _lcd_basic);
lcd_cmd(LCD_DISPLAYCONTROL | LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF);
lcd_cmd(LCD_ENTRYMODESET | LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT);
lcd_clear();
lcd_cmd(LCD_RETURNHOME);
#ifdef LCD_SHOW_CHANNELS
lcd_load_bargraph();
#endif
lcd_load_icons();
}
static void lcd_char_demo(void) {
for (uint8_t m=0; m<32; m++) {
lcd_clear();
lcd_set_cursor(0,0);
lcd_write('H');
lcd_write_uint(m);
lcd_set_cursor(1,0);
for (int j=0; j<8; j++) {
lcd_write(m*8+j);
}
_delay_ms(2000);
}
}
void lcd_clear(void) {
#ifdef USE_LCD_CLEAR_CMD
lcd_cmd(LCD_CLEARDISPLAY);
/* CLEARDISPLAY takes some time to process */
_delay_us(1500);
#else
/* doing it manually seems faster */
for (uint8_t l=0; l<2; l++) {
lcd_set_cursor(l,0);
for (uint8_t r=0; r<8; r++) {
lcd_write(' ');
}
}
lcd_set_cursor(0,0);
#endif
}
void lcd_set_cursor(uint8_t l, uint8_t c) {
static uint8_t offsets[] = {0x00, 0x40, 0x14, 0x54};
lcd_cmd(LCD_SETDDRAMADDR | (c+offsets[l]));
}
void lcd_write(char c) {
lcd_data(c);
}
void lcd_write_str(const char *s) {
while (*s) {
lcd_write(*s++);
}
}
void lcd_write_int(int16_t i) {
lcd_fwrite("%i", i);
}
void lcd_write_uint(uint16_t i) {
lcd_fwrite("%u", i);
}
void lcd_fwrite(const char *format_string, ...) {
char str[10];
va_list args;
va_start(args, format_string);
vsnprintf(str, sizeof(str), format_string, args);
va_end(args);
lcd_write_str(str);
}
uint8_t lcd_refresh_timeout(void) {
static uint32_t timeout = 0;
if (timeout < millis) {
timeout = millis + 50;
return 1;
} else {
return 0;
}
}
void lcd_splash(void) {
#ifdef LCD_SPLASH_SCREEN
lcd_set_cursor(0,0);
lcd_write_str("FUNKEN-");
lcd_set_cursor(1,0);
lcd_write_str("SCHLAG!");
_delay_ms(1000);
lcd_clear();
#endif
}
#endif