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/* Sitronix ST7558 LCD Driver */
/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <stdint.h>
#include <stdio.h>
#include <debug.h>
#include <delay.h>
#include <memory.h>
#include <i2c.h>
#include <display.h>
#include <calypso/clock.h>
#define MORE_CONTROL 0x80
#define CONTROL_RS_RAM 0x40
#define CONTROL_RS_CMD 0x00
#define Y_ADDR(n) (0x40|((n)&0xf))
#define X_ADDR(n) (0x80|((n)&0x3f))
static const uint8_t setup[] = { CONTROL_RS_CMD, 0x2e, 0x21, 0x12, 0xc0, 0x0b, 0x20, 0x11, 0x00, 0x40, 0x80 };
static const uint8_t home[] = { CONTROL_RS_CMD, Y_ADDR(0), X_ADDR(0) };
/* video modes */
static const uint8_t invert[] = { CONTROL_RS_CMD, 0x20, 0x0d };
static const uint8_t normal[] = { CONTROL_RS_CMD, 0x20, 0x0c };
static const uint8_t off[] = { CONTROL_RS_CMD, 0x20, 0x08 };
#define ST7558_SLAVE_ADDR 0x3c
static int st7558_write(const uint8_t *data, int len)
{
int rc = i2c_write(ST7558_SLAVE_ADDR, data[0], 1, data+1, len-1);
/* FIXME: find out why this is needed! */
delay_ms(10);
return rc;
}
static const uint8_t zero16[] = { CONTROL_RS_RAM,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0 };
static void st7558_clrscr(void)
{
int i;
st7558_write(home, sizeof(home));
for (i = 0; i < 102*9; i += 16)
st7558_write(zero16, sizeof(zero16));
st7558_write(home, sizeof(home));
}
static void st7558_init(void)
{
/* Release nRESET */
calypso_reset_set(RESET_EXT, 0);
i2c_init(0,0);
delay_ms(10);
st7558_write(setup, sizeof(setup));
st7558_clrscr();
}
static void st7558_set_attr(unsigned long attr)
{
if (attr & DISP_ATTR_INVERT)
st7558_write(invert, sizeof(invert));
}
static void st7558_unset_attr(unsigned long attr)
{
if (attr & DISP_ATTR_INVERT)
st7558_write(normal, sizeof(normal));
}
/* FIXME: we need a mini-libc */
static void *mcpy(uint8_t *dst, const uint8_t *src, int len)
{
while (len--)
*dst++ = *src++;
return dst;
}
extern const unsigned char fontdata_r8x8[];
static void st7558_putc(unsigned char c)
{
uint8_t putc_buf[16];
uint8_t bytes_per_char = 8;
putc_buf[0] = CONTROL_RS_RAM;
mcpy(putc_buf+1, fontdata_r8x8+(c*bytes_per_char), bytes_per_char);
st7558_write(putc_buf, 1+bytes_per_char);
}
const struct display_driver st7558_display = {
.name = "st7558",
.init = &st7558_init,
.clrscr = &st7558_clrscr,
.set_attr = &st7558_set_attr,
.unset_attr = &st7558_unset_attr,
.putchr = &st7558_putc,
};
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