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Partially handle screen rotation using remapping

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Use row and column remapping to change either row or column addressing
for each orientation.  This removes the need to reverse the drawing
direction of either x or y in the drawing routines.  However in the 90
and 270 case x and y must still be swapped.

Also, rename the SSD1306 remapping command names so they are more
descriptive.
This commit is contained in:
ergosys 2014-12-13 14:34:34 -08:00
parent 7285477f13
commit 9618d7917b
2 changed files with 45 additions and 48 deletions
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7
drivers/gdisp/SSD1306/SSD1306.h
View File

@ -33,10 +33,11 @@
#define SSD1306_HV_PAGE_ADDRESS 0x22
#define SSD1306_PAM_PAGE_START 0xB0
#define SSD1306_COMSCANINC 0xC0
#define SSD1306_COMSCANDEC 0xC8
#define SSD1306_ROWSCANINC 0xC0
#define SSD1306_ROWSCANDEC 0xC8
#define SSD1306_SEGREMAP 0xA0
#define SSD1306_COLSCANINC 0xA0
#define SSD1306_COLSCANDEC 0xA1
#define SSD1306_CHARGEPUMP 0x8D

86
drivers/gdisp/SSD1306/gdisp_lld_SSD1306.c
View File

@ -105,8 +105,8 @@ LLDSPEC bool_t gdisp_lld_init(GDisplay *g) {
write_cmd(g, SSD1306_SETSTARTLINE | 0);
write_cmd2(g, SSD1306_ENABLE_CHARGE_PUMP, 0x14);
write_cmd2(g, SSD1306_MEMORYMODE, 0);
write_cmd(g, SSD1306_SEGREMAP+1);
write_cmd(g, SSD1306_COMSCANDEC);
write_cmd(g, SSD1306_COLSCANDEC);
write_cmd(g, SSD1306_ROWSCANDEC);
#if GDISP_SCREEN_HEIGHT == 64
write_cmd2(g, SSD1306_SETCOMPINS, 0x12);
#else
@ -168,26 +168,11 @@ LLDSPEC bool_t gdisp_lld_init(GDisplay *g) {
#if GDISP_HARDWARE_DRAWPIXEL
LLDSPEC void gdisp_lld_draw_pixel(GDisplay *g) {
coord_t x, y;
switch(g->g.Orientation) {
default:
case GDISP_ROTATE_0:
x = g->p.x;
y = g->p.y;
break;
case GDISP_ROTATE_90:
x = g->p.y;
y = GDISP_SCREEN_HEIGHT-1 - g->p.x;
break;
case GDISP_ROTATE_180:
x = GDISP_SCREEN_WIDTH-1 - g->p.x;
y = GDISP_SCREEN_HEIGHT-1 - g->p.y;
break;
case GDISP_ROTATE_270:
x = GDISP_SCREEN_WIDTH-1 - g->p.y;
y = g->p.x;
break;
coord_t x = g->p.x;
coord_t y = g->p.y;
if (g->g.Orientation == GDISP_ROTATE_90 || g->g.Orientation == GDISP_ROTATE_270) {
coord_t tmp;
tmp = x; x = y; y = tmp;
}
if (gdispColor2Native(g->p.color) != Black)
RAM(g)[xyaddr(x, y)] |= xybit(y);
@ -199,26 +184,11 @@ LLDSPEC bool_t gdisp_lld_init(GDisplay *g) {
#if GDISP_HARDWARE_PIXELREAD
LLDSPEC color_t gdisp_lld_get_pixel_color(GDisplay *g) {
coord_t x, y;
switch(g->g.Orientation) {
default:
case GDISP_ROTATE_0:
x = g->p.x;
y = g->p.y;
break;
case GDISP_ROTATE_90:
x = g->p.y;
y = GDISP_SCREEN_HEIGHT-1 - g->p.x;
break;
case GDISP_ROTATE_180:
x = GDISP_SCREEN_WIDTH-1 - g->p.x;
y = GDISP_SCREEN_HEIGHT-1 - g->p.y;
break;
case GDISP_ROTATE_270:
x = GDISP_SCREEN_WIDTH-1 - g->p.y;
y = g->p.x;
break;
coord_t x = g->p.x;
coord_t y = g->p.y;
if (g->g.Orientation == GDISP_ROTATE_90 || g->g.Orientation == GDISP_ROTATE_270) {
coord_t tmp;
tmp = x; x = y; y = tmp;
}
return (RAM(g)[xyaddr(x, y)] & xybit(y)) ? White : Black;
}
@ -252,8 +222,8 @@ LLDSPEC bool_t gdisp_lld_init(GDisplay *g) {
case GDISP_CONTROL_ORIENTATION:
if (g->g.Orientation == (orientation_t)g->p.ptr)
return;
switch((orientation_t)g->p.ptr) {
/* Rotation is handled by the drawing routines */
orientation_t orient = (orientation_t)g->p.ptr;
switch(orient) {
case GDISP_ROTATE_0:
case GDISP_ROTATE_180:
g->g.Height = GDISP_SCREEN_HEIGHT;
@ -267,7 +237,33 @@ LLDSPEC bool_t gdisp_lld_init(GDisplay *g) {
default:
return;
}
g->g.Orientation = (orientation_t)g->p.ptr;
// Remap the rows and columns according to orientation. This just
// eliminates the need to reverse x or y directions in the drawing
// routines. There is still the need to swap x and y for 90 and 270.
// However, without these, the hardware fill routine would be much
// more complicated.
acquire_bus(g);
switch(orient) {
default:
case GDISP_ROTATE_0:
write_cmd(g, SSD1306_COLSCANDEC);
write_cmd(g, SSD1306_ROWSCANDEC);
break;
case GDISP_ROTATE_180:
write_cmd(g, SSD1306_COLSCANINC);
write_cmd(g, SSD1306_ROWSCANINC);
break;
case GDISP_ROTATE_90:
write_cmd(g, SSD1306_COLSCANDEC);
write_cmd(g, SSD1306_ROWSCANINC);
break;
case GDISP_ROTATE_270:
write_cmd(g, SSD1306_COLSCANINC);
write_cmd(g, SSD1306_ROWSCANDEC);
break;
}
release_bus(g);
g->g.Orientation = orient;
return;
case GDISP_CONTROL_CONTRAST: