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Add support for 64-bit image drawing with MAX7219 8x8 LED Matrix

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The MAX7219 driver has been extended to add support for bitmap drawing
on an 8-by-8 LED matrix panel. Consumers can specify the targeted chip,
which corresponds to a LED matrix panel, and provide a 64-bit image
buffer specifying the pixels which should illuminate.
This commit is contained in:
Trent Rand 2020-11-27 00:01:44 -05:00
parent 503e66a500
commit 22f84a15c3
5 changed files with 161 additions and 1 deletions
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8
extras/max7219/max7219.c
View file

@ -119,7 +119,7 @@ void max7219_set_shutdown_mode(const max7219_display_t *disp, bool shutdown)
bool max7219_set_digit(const max7219_display_t *disp, uint8_t digit, uint8_t val)
{
if (digit >= disp->digits)
if (digit >= (disp->digits * disp->cascade_size))
{
debug("Invalid digit: %d", digit);
return false;
@ -187,3 +187,9 @@ void max7219_draw_text(const max7219_display_t *disp, uint8_t pos, const char *s
s++;
}
}
void max7219_draw_image_8x8(const max7219_display_t *disp, uint8_t pos, const void *image)
{
for (uint8_t i = (pos * disp->digits), offset = 0; i < (disp->digits * disp->cascade_size) && offset < 8; i++, offset++)
max7219_set_digit(disp, i, *((uint8_t *)image + offset));
}

8
extras/max7219/max7219.h
View file

@ -88,6 +88,14 @@ void max7219_clear(const max7219_display_t *disp);
*/
void max7219_draw_text(const max7219_display_t *disp, uint8_t pos, const char *s);
/**
* Draw 64-bit image on 8x8 matrix.
* @param disp Pointer to display descriptor
* @param pos Start digit
* @param image 64-bit buffer with image data
*/
void max7219_draw_image_8x8(const max7219_display_t *disp, uint8_t pos, const void *image);
#ifdef __cplusplus
}
#endif