diff options
Diffstat (limited to 'drivers/gdisp/SSD1306/gdisp_lld.c')
| -rw-r--r-- | drivers/gdisp/SSD1306/gdisp_lld.c | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/drivers/gdisp/SSD1306/gdisp_lld.c b/drivers/gdisp/SSD1306/gdisp_lld.c index 81b3b692..390a9282 100644 --- a/drivers/gdisp/SSD1306/gdisp_lld.c +++ b/drivers/gdisp/SSD1306/gdisp_lld.c @@ -36,6 +36,13 @@ #ifndef GDISP_INITIAL_BACKLIGHT
#define GDISP_INITIAL_BACKLIGHT 100
#endif
+#ifdef SSD1306_PAGE_PREFIX
+ #define SSD1306_PAGE_WIDTH (GDISP_SCREEN_WIDTH+1)
+ #define SSD1306_PAGE_OFFSET 1
+#else
+ #define SSD1306_PAGE_WIDTH GDISP_SCREEN_WIDTH
+ #define SSD1306_PAGE_OFFSET 0
+#endif
#define GDISP_FLG_NEEDFLUSH (GDISP_FLG_DRIVER<<0)
@@ -54,7 +61,7 @@ #define delay(us) gfxSleepMicroseconds(us)
#define delayms(ms) gfxSleepMilliseconds(ms)
-#define xyaddr(x, y) ((x) + ((y)>>3)*GDISP_SCREEN_WIDTH)
+#define xyaddr(x, y) (SSD1306_PAGE_OFFSET + (x) + ((y)>>3)*SSD1306_PAGE_WIDTH)
#define xybit(y) (1<<((y)&7))
/*===========================================================================*/
@@ -70,7 +77,18 @@ LLDSPEC bool_t gdisp_lld_init(GDisplay *g) {
// The private area is the display surface.
- g->priv = gfxAlloc(GDISP_SCREEN_HEIGHT * GDISP_SCREEN_WIDTH / 8);
+ g->priv = gfxAlloc(GDISP_SCREEN_HEIGHT/8 * SSD1306_PAGE_WIDTH);
+
+ // Fill in the prefix command byte on each page line of the display buffer
+ // We can do it during initialisation as this byte is never overwritten.
+ #ifdef SSD1306_PAGE_PREFIX
+ {
+ unsigned i;
+
+ for(i=0; i < GDISP_SCREEN_HEIGHT/8 * SSD1306_PAGE_WIDTH; i+=SSD1306_PAGE_WIDTH)
+ RAM(g)[i] = SSD1306_PAGE_PREFIX;
+ }
+ #endif
// Initialise the board interface
init_board(g);
@@ -131,8 +149,8 @@ LLDSPEC bool_t gdisp_lld_init(GDisplay *g) { write_cmd(g, SSD1306_SETSTARTLINE | 0);
- for(i=0; i < GDISP_SCREEN_WIDTH * GDISP_SCREEN_HEIGHT/8; i+=GDISP_BUS_MAX_TRANSFER_SIZE)
- write_data(g, RAM(g)+i, GDISP_BUS_MAX_TRANSFER_SIZE);
+ for(i=0; i < GDISP_SCREEN_HEIGHT/8 * SSD1306_PAGE_WIDTH; i+=SSD1306_PAGE_WIDTH)
+ write_data(g, RAM(g)+i, SSD1306_PAGE_WIDTH);
}
#endif
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