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#include <stdio.h>
#include <avr/io.h>
#define BAUD 57600
#include <util/setbaud.h>
#include "display.h"
/* WIDTH+1 for string terminator */
static char display[LCD_HEIGHT][LCD_WIDTH+1];
static int cursor_x;
static int cursor_y;
/* Slightly icky hack to use first avaialable USART */
#ifdef UDR0
# define UBRRx UBRR0
# define UCSRxA UCSR0A
# define UCSRxB UCSR0B
# define UCSRxC UCSR0C
# define UCSZx0 UCSZ00
# define UCSZx1 UCSZ01
# define RXENx RXEN0
# define TXENx TXEN0
# define UDREx UDRE0
# define UDRx UDR0
# define U2Xx U2X0
#else
# define UBRRx UBRR1
# define UCSRxA UCSR1A
# define UCSRxB UCSR1B
# define UCSRxC UCSR1C
# define UCSZx0 UCSZ10
# define UCSZx1 UCSZ11
# define RXENx RXEN1
# define TXENx TXEN1
# define UDREx UDRE1
# define UDRx UDR1
# define U2Xx U2X1
#endif
static void uart_init(void)
{
UBRRx = UBRR_VALUE;
#if USE_2X
UCSRxA |= (1 << U2Xx);
#else
UCSRxA &= ~(1 << U2Xx);
#endif
UCSRxB = _BV(RXENx) | _BV(TXENx);
UCSRxC = _BV(UCSZx1) | _BV(UCSZx0);
}
static int uart_putc(char c, FILE *unused)
{
(void)unused;
UDRx = c;
loop_until_bit_is_set(UCSRxA, UDREx);
return 1;
}
/* uart_out is plopped on stdout so that prints go to it by default */
static FILE uart_out = FDEV_SETUP_STREAM(uart_putc, NULL, _FDEV_SETUP_WRITE);
/* internal function to dump the display contents to stdout, since there
* is no background thread for doing this constantly */
static void full_display(void)
{
int y = 0;
printf("\033[6A"); // hack: raw ANSI escape sequence to move up 6
printf(",--------------------.\n");
for (y = 0; y < LCD_HEIGHT; y++) {
printf("|%s|\n", display[y]);
}
printf("`--------------------'\n");
}
/**/
static void display_clear(void)
{
int x = 0;
int y = 0;
for (y = 0; y < LCD_HEIGHT; y++) {
for (x = 0; x < LCD_WIDTH; x++) {
display[y][x] = ' ';
}
display[y][x] = '\0';
}
full_display();
}
static void display_init(void)
{
uart_init();
/* FIXME hack: stdout not guaranteed to be assignable */
stdout = &uart_out;
printf("\n\n\n\n\n\n");
display_clear();
cursor_x = cursor_y = 0;
}
static void display_write(const char *text)
{
char c = '\0';
while (cursor_x < LCD_WIDTH && *text) {
c = *(text++);
/* 0-7 are custom chars in CGRAM on real LCD */
if ((unsigned int)c < 8)
c = '_';
display[cursor_y][cursor_x++] = c;
}
full_display();
}
static void display_set_cursor(int x, int y)
{
cursor_x = x;
cursor_y = y;
}
void get_system_display(struct display *display)
{
display->init = display_init;
display->clear = display_clear;
display->write = display_write;
display->set_cursor = display_set_cursor;
}
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