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ugfx/drivers/gdisp/SSD1306/gdisp_lld_SSD1306.c

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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.org/license.html
*/
#include "gfx.h"
#if GFX_USE_GDISP
#define GDISP_DRIVER_VMT GDISPVMT_SSD1306
#include "gdisp_lld_config.h"
#include "../../../src/gdisp/gdisp_driver.h"
#include "board_SSD1306.h"
#include <string.h> // for memset
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
#ifndef GDISP_SCREEN_HEIGHT
#define GDISP_SCREEN_HEIGHT 64 // This controller should support 32 (untested) or 64
#endif
#ifndef GDISP_SCREEN_WIDTH
#define GDISP_SCREEN_WIDTH 128
#endif
#ifndef GDISP_INITIAL_CONTRAST
#define GDISP_INITIAL_CONTRAST 100
#endif
#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)
#include "SSD1306.h"
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
// Some common routines and macros
#define RAM(g) ((uint8_t *)g->priv)
#define write_cmd2(g, cmd1, cmd2) { write_cmd(g, cmd1); write_cmd(g, cmd2); }
#define write_cmd3(g, cmd1, cmd2, cmd3) { write_cmd(g, cmd1); write_cmd(g, cmd2); write_cmd(g, cmd3); }
// Some common routines and macros
#define delay(us) gfxSleepMicroseconds(us)
#define delayms(ms) gfxSleepMilliseconds(ms)
#define xyaddr(x, y) (SSD1306_PAGE_OFFSET + (x) + ((y)>>3)*SSD1306_PAGE_WIDTH)
#define xybit(y) (1<<((y)&7))
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* As this controller can't update on a pixel boundary we need to maintain the
* the entire display surface in memory so that we can do the necessary bit
* operations. Fortunately it is a small display in monochrome.
* 64 * 128 / 8 = 1024 bytes.
*/
LLDSPEC gBool gdisp_lld_init(GDisplay *g) {
// The private area is the display surface.
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);
// Hardware reset
setpin_reset(g, gTrue);
gfxSleepMilliseconds(20);
setpin_reset(g, gFalse);
gfxSleepMilliseconds(20);
acquire_bus(g);
write_cmd(g, SSD1306_DISPLAYOFF);
write_cmd2(g, SSD1306_SETDISPLAYCLOCKDIV, 0x80);
write_cmd2(g, SSD1306_SETMULTIPLEX, GDISP_SCREEN_HEIGHT-1);
write_cmd2(g, SSD1306_SETPRECHARGE, 0x1F);
write_cmd2(g, SSD1306_SETDISPLAYOFFSET, 0);
write_cmd(g, SSD1306_SETSTARTLINE | 0);
write_cmd2(g, SSD1306_ENABLE_CHARGE_PUMP, 0x14);
write_cmd2(g, SSD1306_MEMORYMODE, 0);
write_cmd(g, SSD1306_COLSCANDEC);
write_cmd(g, SSD1306_ROWSCANDEC);
#if GDISP_SCREEN_HEIGHT == 64
write_cmd2(g, SSD1306_SETCOMPINS, 0x12);
#elif GDISP_SCREEN_HEIGHT == 32
write_cmd2(g, SSD1306_SETCOMPINS, 0x02);
#else
write_cmd2(g, SSD1306_SETCOMPINS, 0x22);
#endif
write_cmd2(g, SSD1306_SETCONTRAST, (uint8_t)(GDISP_INITIAL_CONTRAST*256/101)); // Set initial contrast.
write_cmd2(g, SSD1306_SETVCOMDETECT, 0x10);
write_cmd(g, SSD1306_DISPLAYON);
write_cmd(g, SSD1306_NORMALDISPLAY);
write_cmd3(g, SSD1306_HV_COLUMN_ADDRESS, 0, GDISP_SCREEN_WIDTH-1);
write_cmd3(g, SSD1306_HV_PAGE_ADDRESS, 0, GDISP_SCREEN_HEIGHT/8-1);
// Finish Init
post_init_board(g);
// Release the bus
release_bus(g);
/* Initialise the GDISP structure */
g->g.Width = GDISP_SCREEN_WIDTH;
g->g.Height = GDISP_SCREEN_HEIGHT;
g->g.Orientation = GDISP_ROTATE_0;
g->g.Powermode = gPowerOn;
g->g.Backlight = GDISP_INITIAL_BACKLIGHT;
g->g.Contrast = GDISP_INITIAL_CONTRAST;
return gTrue;
}
#if GDISP_HARDWARE_FLUSH
LLDSPEC void gdisp_lld_flush(GDisplay *g) {
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);
while (pages--) {
#if SSD1306_SH1106
write_cmd(g, SSD1306_PAM_PAGE_START + (7 - pages));
write_cmd(g, SSD1306_SETLOWCOLUMN + 2);
write_cmd(g, SSD1306_SETHIGHCOLUMN);
#endif
write_data(g, ram, SSD1306_PAGE_WIDTH);
ram += SSD1306_PAGE_WIDTH;
}
release_bus(g);
g->flags &= ~GDISP_FLG_NEEDFLUSH;
}
#endif
#if GDISP_HARDWARE_FILLS
LLDSPEC void gdisp_lld_fill_area(GDisplay *g) {
gCoord sy, ey;
gCoord sx, ex;
gCoord col;
unsigned spage, zpages;
uint8_t * base;
uint8_t mask;
switch(g->g.Orientation) {
default:
case GDISP_ROTATE_0:
sx = g->p.x;
ex = g->p.x + g->p.cx - 1;
sy = g->p.y;
ey = sy + g->p.cy - 1;
break;
case GDISP_ROTATE_90:
sx = g->p.y;
ex = g->p.y + g->p.cy - 1;
sy = GDISP_SCREEN_HEIGHT - g->p.x - g->p.cx;
ey = GDISP_SCREEN_HEIGHT-1 - g->p.x;
break;
case GDISP_ROTATE_180:
sx = GDISP_SCREEN_WIDTH - g->p.x - g->p.cx;
ex = GDISP_SCREEN_WIDTH-1 - g->p.x;
sy = GDISP_SCREEN_HEIGHT - g->p.y - g->p.cy;
ey = GDISP_SCREEN_HEIGHT-1 - g->p.y;
break;
case GDISP_ROTATE_270:
sx = GDISP_SCREEN_WIDTH - g->p.y - g->p.cy;
ex = GDISP_SCREEN_WIDTH-1 - g->p.y;
sy = g->p.x;
ey = g->p.x + g->p.cx - 1;
break;
}
spage = sy / 8;
base = RAM(g) + SSD1306_PAGE_OFFSET + SSD1306_PAGE_WIDTH * spage;
mask = 0xff << (sy&7);
zpages = (ey / 8) - spage;
if (gdispColor2Native(g->p.color) == gdispColor2Native(GFX_BLACK)) {
while (zpages--) {
for (col = sx; col <= ex; col++)
base[col] &= ~mask;
mask = 0xff;
base += SSD1306_PAGE_WIDTH;
}
mask &= (0xff >> (7 - (ey&7)));
for (col = sx; col <= ex; col++)
base[col] &= ~mask;
} else {
while (zpages--) {
for (col = sx; col <= ex; col++)
base[col] |= mask;
mask = 0xff;
base += SSD1306_PAGE_WIDTH;
}
mask &= (0xff >> (7 - (ey&7)));
for (col = sx; col <= ex; col++)
base[col] |= mask;
}
g->flags |= GDISP_FLG_NEEDFLUSH;
}
#endif
#if GDISP_HARDWARE_DRAWPIXEL
LLDSPEC void gdisp_lld_draw_pixel(GDisplay *g) {
gCoord 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;
}
if (gdispColor2Native(g->p.color) != gdispColor2Native(GFX_BLACK))
RAM(g)[xyaddr(x, y)] |= xybit(y);
else
RAM(g)[xyaddr(x, y)] &= ~xybit(y);
g->flags |= GDISP_FLG_NEEDFLUSH;
}
#endif
#if GDISP_HARDWARE_PIXELREAD
LLDSPEC gColor gdisp_lld_get_pixel_color(GDisplay *g) {
gCoord 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;
}
return (RAM(g)[xyaddr(x, y)] & xybit(y)) ? GFX_WHITE : GFX_BLACK;
}
#endif
#if GDISP_NEED_CONTROL && GDISP_HARDWARE_CONTROL
LLDSPEC void gdisp_lld_control(GDisplay *g) {
switch(g->p.x) {
case GDISP_CONTROL_POWER:
if (g->g.Powermode == (gPowermode)g->p.ptr)
return;
switch((gPowermode)g->p.ptr) {
case gPowerOff:
case gPowerSleep:
case gPowerDeepSleep:
acquire_bus(g);
write_cmd(g, SSD1306_DISPLAYOFF);
release_bus(g);
break;
case gPowerOn:
acquire_bus(g);
write_cmd(g, SSD1306_DISPLAYON);
release_bus(g);
break;
default:
return;
}
g->g.Powermode = (gPowermode)g->p.ptr;
return;
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 */
case GDISP_ROTATE_0:
case GDISP_ROTATE_180:
g->g.Height = GDISP_SCREEN_HEIGHT;
g->g.Width = GDISP_SCREEN_WIDTH;
break;
case GDISP_ROTATE_90:
case GDISP_ROTATE_270:
g->g.Height = GDISP_SCREEN_WIDTH;
g->g.Width = GDISP_SCREEN_HEIGHT;
break;
default:
return;
}
g->g.Orientation = (orientation_t)g->p.ptr;
return;
case GDISP_CONTROL_CONTRAST:
if ((unsigned)g->p.ptr > 100)
g->p.ptr = (void *)100;
acquire_bus(g);
write_cmd2(g, SSD1306_SETCONTRAST, (((unsigned)g->p.ptr)<<8)/101);
release_bus(g);
g->g.Contrast = (unsigned)g->p.ptr;
return;
// Our own special controller code to inverse the display
// 0 = normal, 1 = inverse
case GDISP_CONTROL_INVERSE:
acquire_bus(g);
write_cmd(g, g->p.ptr ? SSD1306_INVERTDISPLAY : SSD1306_NORMALDISPLAY);
release_bus(g);
return;
}
}
#endif // GDISP_NEED_CONTROL
#endif // GFX_USE_GDISP
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