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#include "lcdlib.h"
// ===================================================================
// Globals
// ===================================================================
static char previous_lines[LCD_HEIGHT][LCD_WIDTH+1];
static FILE *lcd = NULL;
static int line_idx;
static const char* esc = "\x1B[L";
int
lcd_begin(void) {
lcd = fopen("/dev/lcd", "w");
if (lcd == NULL) return EXIT_FAILURE;
fprintf(lcd, "%sB", esc);
fflush(lcd);
lcd_clear();
return EXIT_SUCCESS;
}
void
lcd_end(void) {
fclose(lcd);
}
void
lcd_clear(void) {
line_idx = 0;
for (int y = 0; y + 1 < LCD_HEIGHT; y++) {
fprintf(lcd, "%sy%dx0;%sk", esc, y, esc);
previous_lines[y][0] = 0;
}
fflush(lcd);
}
void
lcd_put_line(const enum LCD_WRITE_MODE mode, const char *line) {
if (mode == L_SCROLL && line_idx == LCD_HEIGHT) {
// If we're at the bottom, ``shift'' everything up
for (int y = 1; y < LCD_HEIGHT; y++) {
// Go to the start of row y, clear the line, and print the
// previous string there
fprintf(lcd, "%sy%dx0;%sk%s", esc, y-1, esc, previous_lines[y]);
// Overwrite the stored previous line with the next
strncpy(previous_lines[y-1], previous_lines[y], 17);
}
line_idx--;
}
// Go to the correct line, clear it, and write the input.
fprintf(lcd, "%sy%dx0;%sk%s", esc, line_idx, esc, line);
fflush(lcd);
// Store this line, null-terminate!
strncpy(previous_lines[line_idx], line, 16);
previous_lines[line_idx][16] = 0;
if (mode == L_SCROLL && line_idx < LCD_HEIGHT) line_idx++;
}
void
lcd_printf_line(const enum LCD_WRITE_MODE mode,
const char *format, ...) {
char buf[16];
va_list(args);
va_start(args, format);
vsnprintf(buf, 16, format, args);
va_end(args);
lcd_put_line(mode, buf);
}
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