ssd0303.c
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/*
* SSD0303 OLED controller with OSRAM Pictiva 96x16 display.
*
* Copyright (c) 2006-2007 CodeSourcery.
* Written by Paul Brook
*
* This code is licenced under the GPL.
*/
/* The controller can support a variety of different displays, but we only
implement one. Most of the commends relating to brightness and geometry
setup are ignored. */
#include "hw.h"
#include "i2c.h"
#include "console.h"
//#define DEBUG_SSD0303 1
#ifdef DEBUG_SSD0303
#define DPRINTF(fmt, args...) \
do { printf("ssd0303: " fmt , ##args); } while (0)
#define BADF(fmt, args...) \
do { fprintf(stderr, "ssd0303: error: " fmt , ##args); exit(1);} while (0)
#else
#define DPRINTF(fmt, args...) do {} while(0)
#define BADF(fmt, args...) \
do { fprintf(stderr, "ssd0303: error: " fmt , ##args);} while (0)
#endif
/* Scaling factor for pixels. */
#define MAGNIFY 4
enum ssd0303_mode
{
SSD0303_IDLE,
SSD0303_DATA,
SSD0303_CMD
};
enum ssd0303_cmd {
SSD0303_CMD_NONE,
SSD0303_CMD_SKIP1
};
typedef struct {
i2c_slave i2c;
DisplayState *ds;
int row;
int col;
int start_line;
int mirror;
int flash;
int enabled;
int inverse;
int redraw;
enum ssd0303_mode mode;
enum ssd0303_cmd cmd_state;
uint8_t framebuffer[132*8];
} ssd0303_state;
static int ssd0303_recv(i2c_slave *i2c)
{
BADF("Reads not implemented\n");
return -1;
}
static int ssd0303_send(i2c_slave *i2c, uint8_t data)
{
ssd0303_state *s = (ssd0303_state *)i2c;
enum ssd0303_cmd old_cmd_state;
switch (s->mode) {
case SSD0303_IDLE:
DPRINTF("byte 0x%02x\n", data);
if (data == 0x80)
s->mode = SSD0303_CMD;
else if (data == 0x40)
s->mode = SSD0303_DATA;
else
BADF("Unexpected byte 0x%x\n", data);
break;
case SSD0303_DATA:
DPRINTF("data 0x%02x\n", data);
if (s->col < 132) {
s->framebuffer[s->col + s->row * 132] = data;
s->col++;
s->redraw = 1;
}
break;
case SSD0303_CMD:
old_cmd_state = s->cmd_state;
s->cmd_state = SSD0303_CMD_NONE;
switch (old_cmd_state) {
case SSD0303_CMD_NONE:
DPRINTF("cmd 0x%02x\n", data);
s->mode = SSD0303_IDLE;
switch (data) {
case 0x00 ... 0x0f: /* Set lower colum address. */
s->col = (s->col & 0xf0) | (data & 0xf);
break;
case 0x10 ... 0x20: /* Set higher column address. */
s->col = (s->col & 0x0f) | ((data & 0xf) << 4);
break;
case 0x40 ... 0x7f: /* Set start line. */
s->start_line = 0;
break;
case 0x81: /* Set contrast (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xa0: /* Mirror off. */
s->mirror = 0;
break;
case 0xa1: /* Mirror off. */
s->mirror = 1;
break;
case 0xa4: /* Entire display off. */
s->flash = 0;
break;
case 0xa5: /* Entire display on. */
s->flash = 1;
break;
case 0xa6: /* Inverse off. */
s->inverse = 0;
break;
case 0xa7: /* Inverse on. */
s->inverse = 1;
break;
case 0xa8: /* Set multipled ratio (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xad: /* DC-DC power control. */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xae: /* Display off. */
s->enabled = 0;
break;
case 0xaf: /* Display on. */
s->enabled = 1;
break;
case 0xb0 ... 0xbf: /* Set Page address. */
s->row = data & 7;
break;
case 0xc0 ... 0xc8: /* Set COM output direction (Ignored). */
break;
case 0xd3: /* Set display offset (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xd5: /* Set display clock (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xd8: /* Set color and power mode (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xd9: /* Set pre-charge period (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xda: /* Set COM pin configuration (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xdb: /* Set VCOM dselect level (Ignored). */
s->cmd_state = SSD0303_CMD_SKIP1;
break;
case 0xe3: /* no-op. */
break;
default:
BADF("Unknown command: 0x%x\n", data);
}
break;
case SSD0303_CMD_SKIP1:
DPRINTF("skip 0x%02x\n", data);
break;
}
break;
}
return 0;
}
static void ssd0303_event(i2c_slave *i2c, enum i2c_event event)
{
ssd0303_state *s = (ssd0303_state *)i2c;
switch (event) {
case I2C_FINISH:
s->mode = SSD0303_IDLE;
break;
case I2C_START_RECV:
case I2C_START_SEND:
case I2C_NACK:
/* Nothing to do. */
break;
}
}
static void ssd0303_update_display(void *opaque)
{
ssd0303_state *s = (ssd0303_state *)opaque;
uint8_t *dest;
uint8_t *src;
int x;
int y;
int line;
char *colors[2];
char colortab[MAGNIFY * 8];
int dest_width;
uint8_t mask;
if (s->redraw) {
switch (s->ds->depth) {
case 0:
return;
case 15:
dest_width = 2;
break;
case 16:
dest_width = 2;
break;
case 24:
dest_width = 3;
break;
case 32:
dest_width = 4;
break;
default:
BADF("Bad color depth\n");
return;
}
dest_width *= MAGNIFY;
memset(colortab, 0xff, dest_width);
memset(colortab + dest_width, 0, dest_width);
if (s->flash) {
colors[0] = colortab;
colors[1] = colortab;
} else if (s->inverse) {
colors[0] = colortab;
colors[1] = colortab + dest_width;
} else {
colors[0] = colortab + dest_width;
colors[1] = colortab;
}
dest = s->ds->data;
for (y = 0; y < 16; y++) {
line = (y + s->start_line) & 63;
src = s->framebuffer + 132 * (line >> 3) + 36;
mask = 1 << (line & 7);
for (x = 0; x < 96; x++) {
memcpy(dest, colors[(*src & mask) != 0], dest_width);
dest += dest_width;
src++;
}
for (x = 1; x < MAGNIFY; x++) {
memcpy(dest, dest - dest_width * 96, dest_width * 96);
dest += dest_width * 96;
}
}
}
dpy_update(s->ds, 0, 0, 96 * MAGNIFY, 16 * MAGNIFY);
}
static void ssd0303_invalidate_display(void * opaque)
{
ssd0303_state *s = (ssd0303_state *)opaque;
s->redraw = 1;
}
void ssd0303_init(DisplayState *ds, i2c_bus *bus, int address)
{
ssd0303_state *s;
s = (ssd0303_state *)i2c_slave_init(bus, address, sizeof(ssd0303_state));
s->ds = ds;
s->i2c.event = ssd0303_event;
s->i2c.recv = ssd0303_recv;
s->i2c.send = ssd0303_send;
graphic_console_init(ds, ssd0303_update_display, ssd0303_invalidate_display,
NULL, s);
dpy_resize(s->ds, 96 * MAGNIFY, 16 * MAGNIFY);
}