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#include <stdlib.h>
#include <string.h>
#include <OLEDDisplay.h>
#include <Wire.h>
#include "screen.h"
static void draw_lines(OLEDDisplay *screen, struct display_status *status);
static void update_lines(struct display_status *status);
static void sanitize_msg(char *msg);
void display_status_init(OLEDDisplay *screen, struct display_status *status, char *msg, size_t size, unsigned long int period)
{
status->period = period;
status->screen = screen;
size = MESSAGE_MAX < size ? MESSAGE_MAX : size;
memset(status->message, 0, size + 1);
memcpy(status->message, msg, size);
status->msg_len = size;
sanitize_msg(status->message);
status->cursor = status->message;
status->remaining = status->msg_len;
update_lines(status);
draw_lines(status->screen, status);
status->last_scroll_time = millis();
}
int display_update_scroll(struct display_status *status)
{
unsigned long crr_time;
int ret = END_OF_MESSAGE;
if (status->remaining) {
crr_time = millis();
/* Only scroll lines once a period, because --- duh! */
if ((crr_time - status->last_scroll_time) > status->period) {
status->last_scroll_time = crr_time;
update_lines(status);
draw_lines(status->screen, status);
}
ret = 0;
}
return ret;
}
/**
* Turns all whitespace and special characters into literal spaces to save
* screen real-estate and possible misinterpretation.
*/
static void sanitize_msg(char *msg)
{
do {
switch (*msg) {
case '\f':
case '\n':
case '\r':
case '\t':
case '\v':
*msg = ' ';
break;
default:
if (*msg < 0x20 || *msg > 0x7f) {
*msg = '?';
}
break;
}
} while (*(++msg));
end:
return;
}
static void draw_lines(OLEDDisplay *screen, struct display_status *status)
{
size_t i;
screen->clear();
for (i = 0; i < SCREEN_LINE_COUNT; ++i) {
screen->drawString(0, i * FONT_HEIGHT, status->lines[i]);
}
screen->display();
}
static void update_lines(struct display_status *status)
{
size_t i;
if (status->remaining) {
memset(status->lines, 0, sizeof(status->lines));
for (i = 0; i < SCREEN_LINE_COUNT; ++i) {
if (status->remaining > SCREEN_LINE_CHARS) {
memcpy(status->lines[i], status->cursor, SCREEN_LINE_CHARS);
status->cursor += SCREEN_LINE_CHARS;
status->remaining -= SCREEN_LINE_CHARS;
} else if (status->remaining) {
memcpy(status->lines[i], status->cursor, status->remaining);
status->cursor += status->remaining;
status->remaining = 0;
}
}
}
}
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