Some old AVR projects
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#include <avr/io.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <stdbool.h>
#include <stdint.h>
#include "uart.h"
#include "uart_ansi.h"
void _vt_apply_style();
void _vt_reset_attribs_do();
void _vt_style_do();
void _vt_color_do();
void vt_goto(uint8_t x, uint8_t y)
{
uart_putc(27);
uart_putc('[');
uart_putu(x);
uart_putc(';');
uart_putu(y);
uart_putc('H');
}
void vt_goto_x(uint8_t x)
{
uart_putc(27);
uart_putc('[');
uart_putu(x);
uart_putc('`');
}
void vt_goto_y(uint8_t y)
{
uart_putc(27);
uart_putc('[');
uart_putu(y);
uart_putc('d');
}
void vt_move(int8_t x, int8_t y)
{
vt_move_x(x);
vt_move_y(y);
}
void vt_move_x(int8_t x)
{
if (x < 0) {
vt_left(-x);
} else {
vt_right(x);
}
}
void vt_move_y(int8_t y)
{
if (y < 0) {
vt_up(-y);
} else {
vt_down(y);
}
}
void vt_up(uint8_t y)
{
if (y == 0) return;
uart_putc(27);
uart_putc('[');
uart_putu(y);
uart_putc('A');
}
void vt_down(uint8_t y)
{
if (y == 0) return;
uart_putc(27);
uart_putc('[');
uart_putu(y);
uart_putc('B');
}
void vt_left(uint8_t x)
{
if (x == 0) return;
uart_putc(27);
uart_putc('[');
uart_putu(x);
uart_putc('D');
}
void vt_right(uint8_t x)
{
if (x == 0) return;
uart_putc(27);
uart_putc('[');
uart_putu(x);
uart_putc('C');
}
void vt_scroll(int8_t y)
{
while (y < 0) {
uart_putc(27);
uart_putc('D'); // up
y++;
}
while (y > 0) {
uart_putc(27);
uart_putc('M'); // down
y--;
}
}
void vt_scroll_set(uint8_t from, uint8_t to)
{
uart_putc(27);
uart_putc('[');
uart_putu(from);
uart_putc(';');
uart_putu(to);
uart_putc('r');
}
void vt_scroll_reset()
{
uart_putc(27);
uart_putc('[');
uart_putc('r');
}
typedef struct {
uint8_t flags;
uint8_t fg;
uint8_t bg;
} vt_style_t;
vt_style_t saved_style;
vt_style_t current_style;
void vt_save()
{
uart_puts_pgm(PSTR("\x1B[s"));
saved_style = current_style;
}
void vt_restore()
{
uart_puts_pgm(PSTR("\x1B[u"));
current_style = saved_style;
}
/** Disable all text attributes (excluding color) */
void vt_attr_reset()
{
current_style.flags = 0;
_vt_reset_attribs_do();
_vt_apply_style();
}
/** Set color to white on black */
void vt_color_reset()
{
current_style.fg = VT_WHITE;
current_style.bg = VT_BLACK;
_vt_color_do();
}
/** Enable or disable a text attribute */
void vt_attr(uint8_t attribute, bool on)
{
// flags are powers of two
// so this can handle multiple OR'd flags
for(uint8_t c = 1; c <= VT_FAINT; c *= 2) {
if (attribute & c) {
if (on) {
current_style.flags |= c;
} else {
current_style.flags &= ~c;
}
}
}
_vt_apply_style();
}
/** Send style and color commands */
void _vt_apply_style()
{
_vt_reset_attribs_do();
_vt_style_do();
_vt_color_do();
}
/** Set color 0..7 */
void vt_color(uint8_t fg, uint8_t bg)
{
current_style.fg = fg;
current_style.bg = bg;
_vt_color_do();
}
/** Set FG color 0..7 */
void vt_color_fg(uint8_t fg)
{
current_style.fg = fg;
_vt_color_do();
}
/** Set BG color 0..7 */
void vt_color_bg(uint8_t bg)
{
current_style.bg = bg;
_vt_color_do();
}
/** Send reset command */
inline void _vt_reset_attribs_do()
{
uart_puts_pgm(PSTR("\x1B[m")); // reset
}
/** Send commands for text attribs */
void _vt_style_do()
{
if (current_style.flags & VT_BOLD) {
uart_puts_pgm(PSTR("\x1B[1m"));
}
if (current_style.flags & VT_FAINT) {
uart_puts_pgm(PSTR("\x1B[2m"));
}
if (current_style.flags & VT_ITALIC) {
uart_puts_pgm(PSTR("\x1B[3m"));
}
if (current_style.flags & VT_UNDERLINE) {
uart_puts_pgm(PSTR("\x1B[4m"));
}
if (current_style.flags & VT_BLINK) {
uart_puts_pgm(PSTR("\x1B[5m"));
}
if (current_style.flags & VT_REVERSE) {
uart_puts_pgm(PSTR("\x1B[7m"));
}
}
/** Send commands for xolor */
void _vt_color_do()
{
uart_putc(27);
uart_putc('[');
uart_putu(30 + current_style.fg);
uart_putc(';');
uart_putu(40 + current_style.bg);
uart_putc('m');
}
/** Insert blank lines febore the current line */
void vt_insert_lines(uint8_t count)
{
uart_putc(27);
uart_putc('[');
uart_putu(count);
uart_putc('L');
}
/** Delete lines from the current line down */
void vt_delete_lines(uint8_t count)
{
uart_putc(27);
uart_putc('[');
uart_putu(count);
uart_putc('M');
}
/** Insert empty characters at cursor */
void vt_insert_chars(uint8_t count)
{
uart_putc(27);
uart_putc('[');
uart_putu(count);
uart_putc('@');
}
/** Delete characters at cursor */
void vt_delete_chars(uint8_t count)
{
uart_putc(27);
uart_putc('[');
uart_putu(count);
uart_putc('P');
}
void vt_clear()
{
uart_puts_pgm(PSTR("\x1B[2J"));
}
void vt_erase_forth()
{
uart_puts_pgm(PSTR("\x1B[K"));
}
void vt_erase_back()
{
uart_puts_pgm(PSTR("\x1B[1K"));
}
void vt_erase_line()
{
uart_puts_pgm(PSTR("\x1B[2K"));
}
void vt_erase_above()
{
uart_puts_pgm(PSTR("\x1B[1J"));
}
void vt_erase_below()
{
uart_puts_pgm(PSTR("\x1B[J"));
}
void vt_home()
{
uart_puts_pgm(PSTR("\x1B[H"));
}
/** Initialize helper variables */
void vt_init()
{
vt_reset();
}
/** Reset state and clear screen */
void vt_reset()
{
// reset color and attributes
vt_color_reset();
vt_attr_reset();
vt_scroll_reset();
// clear screen
vt_clear();
// go to top left
vt_home();
// overwrite saved state
vt_save();
}
// Assigned keyhandler
void (*_vt_kh)(uint8_t, bool) = NULL;
/** Assign a key handler (later used with vt_handle_key) */
void vt_set_key_handler(void (*handler)(uint8_t, bool))
{
_vt_kh = handler;
}
// state machine states
typedef enum {
GROUND = 0,
ESC = 1,
BR = 2,
O = 3,
WAITING_TILDE = 4
} KSTATE;
// code received before started to wait for a tilde
uint8_t _before_wtilde;
// current state
KSTATE _kstate = GROUND;
void _vt_kh_abort()
{
switch (_kstate) {
case ESC:
_vt_kh(VK_ESC, true);
break;
case BR:
_vt_kh(VK_ESC, true);
_vt_kh('[', false);
break;
case O:
_vt_kh(VK_ESC, true);
_vt_kh('O', false);
break;
case WAITING_TILDE:
_vt_kh(VK_ESC, true);
_vt_kh('[', false);
vt_handle_key(_before_wtilde);
break;
case GROUND:
// nop
break;
}
_kstate = GROUND;
}
/**
* Handle a key received over UART
* Takes care of multi-byte keys and translates them to special
* constants.
*/
void vt_handle_key(uint8_t c)
{
if (_vt_kh == NULL) return;
switch (_kstate) {
case GROUND:
switch (c) {
case 27:
_kstate = ESC;
break;
case VK_ENTER:
case VK_TAB:
case VK_BACKSPACE:
_vt_kh(c, true);
return;
default:
_vt_kh(c, false);
return;
}
break; // continue to next char
case ESC:
switch (c) {
case '[':
_kstate = BR;
break; // continue to next char
case 'O':
_kstate = O;
break; // continue to next char
default:
// bad code
_vt_kh_abort();
vt_handle_key(c);
return;
}
break;
case BR:
switch (c) {
// arrows
case 65:
case 66:
case 67:
case 68:
_vt_kh(c, true);
_kstate = GROUND;
return;
// ins del pgup pgdn
case 50:
case 51:
case 53:
case 54:
// wait for terminating tilde
_before_wtilde = c;
_kstate = WAITING_TILDE;
break; // continue to next char
// bad key
default:
_vt_kh_abort();
vt_handle_key(c);
return;
}
break;
case O:
switch (c) {
// F keys
case 80:
case 81:
case 82:
case 83:
// home, end
case 72:
case 70:
_vt_kh(c, true);
_kstate = GROUND;
return;
// bad key
default:
_vt_kh_abort();
vt_handle_key(c);
return;
}
case WAITING_TILDE:
if (c != '~') {
_vt_kh_abort();
vt_handle_key(c);
return;
} else {
_vt_kh(_before_wtilde, true);
_kstate = GROUND;
return;
}
}
// wait for next key
if (_kstate != GROUND) {
_delay_ms(2);
if (!uart_rx_ready()) {
// abort receiving
_vt_kh_abort();
} else {
vt_handle_key(uart_rx());
}
}
}