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slightly faster flush and clear

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This commit is contained in:
ergosys 2014-12-12 15:27:37 -08:00
parent cb115186c5
commit bdfafbcf9f
1 changed files with 11 additions and 6 deletions
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17
drivers/gdisp/SSD1306/gdisp_lld_SSD1306.c
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@ -14,6 +14,7 @@
#include "src/gdisp/driver.h"
#include "board_SSD1306.h"
#include <string.h> // for memset
/*===========================================================================*/
/* Driver local definitions. */
@ -136,17 +137,22 @@ LLDSPEC bool_t gdisp_lld_init(GDisplay *g) {
#if GDISP_HARDWARE_FLUSH
LLDSPEC void gdisp_lld_flush(GDisplay *g) {
unsigned i;
uint8_t * ram;
unsigned pages;
// Don't flush if we don't need it.
if (!(g->flags & GDISP_FLG_NEEDFLUSH))
return;
ram = RAM(g);
pages = GDISP_SCREEN_HEIGHT/8;
acquire_bus(g);
write_cmd(g, SSD1306_SETSTARTLINE | 0);
for(i=0; i < GDISP_SCREEN_HEIGHT/8 * SSD1306_PAGE_WIDTH; i+=SSD1306_PAGE_WIDTH)
write_data(g, RAM(g)+i, SSD1306_PAGE_WIDTH);
while (pages--) {
write_data(g, ram, SSD1306_PAGE_WIDTH);
ram += SSD1306_PAGE_WIDTH;
}
release_bus(g);
}
#endif
@ -155,9 +161,8 @@ LLDSPEC bool_t gdisp_lld_init(GDisplay *g) {
LLDSPEC void gdisp_lld_clear(GDisplay *g) {
uint8_t fill = (g->p.color == Black) ? 0 : 0xff;
int bytes = GDISP_SCREEN_WIDTH * GDISP_SCREEN_HEIGHT/8;
int off;
for (off = 0; off < bytes; off++)
RAM(g)[off] = fill;
memset(RAM(g), fill, bytes);
g->flags |= GDISP_FLG_NEEDFLUSH;
}
#endif