123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
/* Sitronix ST7558 LCD Driver */
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/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <debug.h>
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#include <delay.h>
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#include <memory.h>
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#include <i2c.h>
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#include <display/st7558.h>
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#include <calypso/clock.h>
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#define MORE_CONTROL 0x80
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#define CONTROL_RS_RAM 0x40
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#define CONTROL_RS_CMD 0x00
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#define Y_ADDR(n) (0x40|((n)&0xf))
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#define X_ADDR(n) (0x80|((n)&0x3f))
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static const uint8_t setup[] = { CONTROL_RS_CMD, 0x2e, 0x21, 0x12, 0xc0, 0x0b, 0x20, 0x11, 0x00, 0x40, 0x80 };
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static const uint8_t home[] = { CONTROL_RS_CMD, Y_ADDR(0), X_ADDR(0) };
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/* video modes */
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static const uint8_t invert[] = { CONTROL_RS_CMD, 0x20, 0x0d };
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static const uint8_t normal[] = { CONTROL_RS_CMD, 0x20, 0x0c };
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static const uint8_t off[] = { CONTROL_RS_CMD, 0x20, 0x08 };
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#define ST7558_SLAVE_ADDR 0x3c
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static int st7558_write(const uint8_t *data, int len)
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{
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int rc = i2c_write(ST7558_SLAVE_ADDR, data[0], 1, data+1, len-1);
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/* FIXME: find out why this is needed! */
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delay_ms(10);
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return rc;
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}
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void st7558_init(void)
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{
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/* Release nRESET */
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calypso_reset_set(RESET_EXT, 0);
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i2c_init(0,0);
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delay_ms(10);
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st7558_write(setup, sizeof(setup));
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st7558_clrscr();
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}
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void st7558_set_attr(unsigned long attr)
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{
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if (attr & DISP_ATTR_INVERT)
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st7558_write(invert, sizeof(invert));
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}
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void st7558_unset_attr(unsigned long attr)
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{
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if (attr & DISP_ATTR_INVERT)
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st7558_write(normal, sizeof(normal));
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}
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static const uint8_t zero16[] = { CONTROL_RS_RAM,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0 };
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void st7558_clrscr(void)
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{
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int i;
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st7558_write(home, sizeof(home));
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for (i = 0; i < 102*9; i += 16)
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st7558_write(zero16, sizeof(zero16));
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st7558_write(home, sizeof(home));
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}
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/* FIXME: we need a mini-libc */
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static void *mcpy(uint8_t *dst, const uint8_t *src, int len)
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{
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while (len--)
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*dst++ = *src++;
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return dst;
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}
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extern const unsigned char fontdata_r8x8[];
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void st7558_putchar(unsigned char c)
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{
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uint8_t putc_buf[16];
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uint8_t bytes_per_char = 8;
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putc_buf[0] = CONTROL_RS_RAM;
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mcpy(putc_buf+1, fontdata_r8x8+(c*bytes_per_char), bytes_per_char);
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st7558_write(putc_buf, 1+bytes_per_char);
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}
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void st7558_puts(const char *str)
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{
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char c;
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while ((c = *str++))
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st7558_putchar(c);
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}
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