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#include <tft.h>
#include <zeta.h>
#include <tty.h>
struct color {
uint8_t r, g, b;
};
static u16 row = 0;
static u16 col = 0;
// Index of first row inside buf
static volatile u8 head = 0;
// TTY's current contents
static volatile u8 buf[TTY_HEIGHT][TTY_WIDTH];
static volatile struct color bg_color = {0x00, 0x00, 0x00};
static volatile struct color fg_color = {0xFF, 0xFB, 0x00};
extern const u8 font[97][8];
static u8 cursor = 0;
static u8 timer = 0;
u8 blink = 0;
void
blink_cursor(void) __critical __interrupt(3)
{
if (++timer >= 75 && blink) {
u8 i;
tft_set_area(8 * col, 8 * row, 8, 8);
tft_ram_wr();
if ((cursor ^= 1)) {
for (i = 0; i < 64; ++i)
tft_pixel(fg_color.r, fg_color.g, fg_color.b);
} else {
for (i = 0; i < 64; ++i)
tft_pixel(bg_color.r, bg_color.g, bg_color.b);
}
timer = 0;
}
}
static void
draw(u8 c)
{
u8 i, j;
const u8 *chr;
if (c < ' ')
return;
chr = font[c - ' '];
tft_ram_wr();
for (i = 0; i < 8; ++i) {
u8 row = chr[i];
for (j = 0; j < 8; ++j) {
if (row & 1)
tft_pixel(fg_color.r, fg_color.g, fg_color.b);
else
tft_pixel(bg_color.r, bg_color.g, bg_color.b);
row >>= 1;
}
}
}
static void
scroll(void)
{
u16 i, j;
head = (head + 1) % TTY_HEIGHT;
for (i = head; i < TTY_HEIGHT; ++i) {
for (j = 0; j < TTY_WIDTH; ++j) {
tft_set_area(8 * j, 8 * (i - head), 8, 8);
draw(buf[i][j]);
}
}
for (i = 0; i < head - 1; ++i) {
for (j = 0; j < TTY_WIDTH; ++j) {
tft_set_area(8 * j, 8 * (TTY_HEIGHT - head + i), 8, 8);
draw(buf[i][j]);
}
}
for (j = 0; j < TTY_WIDTH; ++j) {
tft_set_area(8 * j, 8 * (TTY_HEIGHT - 1), 8, 8);
draw(' ');
}
}
static void
newline(void)
{
if (++row >= TTY_HEIGHT) {
row = TTY_HEIGHT - 1;
scroll();
}
}
static void
advance(void)
{
if (++col >= TTY_WIDTH) {
newline();
col = 0;
}
}
void
addch(char c)
{
switch (c) {
case '\b':
if (col != 0)
--col;
return;
case '\r':
col = 0;
return;
case '\n':
newline();
return;
}
DI;
u8 tmp = blink;
blink = 0;
EI;
tft_set_area(8 * col, 8 * row, 8, 8);
draw(c);
DI;
blink = tmp;
EI;
buf[(head + row) % TTY_HEIGHT][col] = c;
advance();
}
void
setcur(u16 ncol, u16 nrow)
{
col = ncol;
row = nrow;
}
void
swap_colors(void)
{
struct color tmp = {fg_color.r, fg_color.g, fg_color.b};
fg_color = bg_color;
bg_color = tmp;
}
void
addstr(const char *str)
{
while (*str) {
addch(*str);
++str;
}
}
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