391 lines
7.1 KiB
C
391 lines
7.1 KiB
C
/* $NetBSD: iq31244_7seg.c,v 1.2 2003/07/15 00:25:01 lukem Exp $ */
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/*-
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* Copyright (c) 2001, 2002, 2003 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Jason R. Thorpe for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Support for the 7-segment display on the Intel IQ31244.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/sysctl.h>
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#include <machine/bus.h>
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#include <arm/xscale/i80321/iq80321reg.h>
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#include <arm/xscale/i80321/iq80321var.h>
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#define WRITE(x, v) *((__volatile uint8_t *) (x)) = (v)
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static int snakestate;
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/*
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* The 7-segment display looks like so:
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*
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* A
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* +-----+
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* | |
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* F | | B
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* | G |
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* +-----+
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* | |
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* E | | C
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* | D |
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* +-----+ o DP
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*
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* Setting a bit clears the corresponding segment on the
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* display.
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*/
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#define SEG_A (1 << 0)
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#define SEG_B (1 << 1)
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#define SEG_C (1 << 2)
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#define SEG_D (1 << 3)
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#define SEG_E (1 << 4)
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#define SEG_F (1 << 5)
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#define SEG_G (1 << 6)
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#define SEG_DP (1 << 7)
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static const uint8_t digitmap[] = {
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/* +#####+
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* # #
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* # #
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* # #
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* +-----+
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* # #
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* # #
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* # #
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* +#####+
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*/
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SEG_G,
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/* +-----+
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* | #
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* | #
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* | #
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* +-----+
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* | #
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* | #
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* | #
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* +-----+
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*/
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SEG_A|SEG_D|SEG_E|SEG_F|SEG_G,
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/* +#####+
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* | #
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* | #
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* | #
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* +#####+
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* # |
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* # |
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* # |
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* +#####+
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*/
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SEG_C|SEG_F,
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/* +#####+
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* | #
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* | #
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* | #
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* +#####+
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* | #
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* | #
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* | #
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* +#####+
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*/
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SEG_E|SEG_F,
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/* +-----+
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* # #
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* # #
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* # #
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* +#####+
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* | #
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* | #
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* | #
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* +-----+
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*/
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SEG_A|SEG_D|SEG_E,
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/* +#####+
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* # |
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* # |
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* # |
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* +#####+
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* | #
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* | #
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* | #
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* +#####+
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*/
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SEG_B|SEG_E,
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/* +#####+
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* # |
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* # |
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* # |
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* +#####+
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* # #
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* # #
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* # #
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* +#####+
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*/
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SEG_B,
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/* +#####+
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* | #
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* | #
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* | #
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* +-----+
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* | #
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* | #
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* | #
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* +-----+
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*/
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SEG_D|SEG_E|SEG_F,
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/* +#####+
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* # #
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* # #
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* # #
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* +#####+
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* # #
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* # #
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* # #
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* +#####+
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*/
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0,
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/* +#####+
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* # #
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* # #
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* # #
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* +#####+
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* | #
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* | #
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* | #
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* +-----+
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*/
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SEG_D|SEG_E,
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};
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static uint8_t
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iq80321_7seg_xlate(char c)
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{
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uint8_t rv;
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if (c >= '0' && c <= '9')
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rv = digitmap[c - '0'];
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else if (c == '.')
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rv = (uint8_t) ~SEG_DP;
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else
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rv = 0xff;
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return (rv);
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}
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void
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iq80321_7seg(char a, char b)
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{
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uint8_t msb, lsb;
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msb = iq80321_7seg_xlate(a);
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lsb = iq80321_7seg_xlate(b);
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snakestate = 0;
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WRITE(IQ80321_7SEG_MSB, msb);
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WRITE(IQ80321_7SEG_LSB, lsb);
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}
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static const uint8_t snakemap[][2] = {
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/* +#####+ +#####+
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* | | | |
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* | | | |
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* | | | |
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* +-----+ +-----+
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* | | | |
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* | | | |
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* | | | |
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* +-----+ +-----+
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*/
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{ ~SEG_A, ~SEG_A },
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/* +-----+ +-----+
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* # | | #
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* # | | #
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* # | | #
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* +-----+ +-----+
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* | | | |
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* | | | |
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* | | | |
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* +-----+ +-----+
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*/
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{ ~SEG_F, ~SEG_B },
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/* +-----+ +-----+
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* | | | |
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* | | | |
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* | | | |
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* +#####+ +#####+
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* | | | |
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* | | | |
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* | | | |
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* +-----+ +-----+
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*/
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{ ~SEG_G, ~SEG_G },
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/* +-----+ +-----+
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* | | | |
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* | | | |
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* | | | |
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* +-----+ +-----+
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* | # # |
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* | # # |
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* | # # |
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* +-----+ +-----+
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*/
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{ ~SEG_C, ~SEG_E },
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/* +-----+ +-----+
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* | | | |
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* | | | |
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* | | | |
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* +-----+ +-----+
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* | | | |
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* | | | |
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* | | | |
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* +#####+ +#####+
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*/
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{ ~SEG_D, ~SEG_D },
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/* +-----+ +-----+
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* | | | |
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* | | | |
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* | | | |
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* +-----+ +-----+
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* # | | #
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* # | | #
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* # | | #
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* +-----+ +-----+
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*/
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{ ~SEG_E, ~SEG_C },
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/* +-----+ +-----+
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* | | | |
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* | | | |
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* | | | |
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* +#####+ +#####+
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* | | | |
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* | | | |
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* | | | |
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* +-----+ +-----+
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*/
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{ ~SEG_G, ~SEG_G },
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/* +-----+ +-----+
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* | # # |
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* | # # |
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* | # # |
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* +-----+ +-----+
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* | | | |
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* | | | |
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* | | | |
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* +-----+ +-----+
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*/
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{ ~SEG_B, ~SEG_F },
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};
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static SYSCTL_NODE(_hw, OID_AUTO, sevenseg, CTLFLAG_RD, 0, "7 seg");
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static int freq = 20;
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SYSCTL_INT(_hw_sevenseg, OID_AUTO, freq, CTLFLAG_RW, &freq, 0,
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"7 Seg update frequency");
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static void
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iq31244_7seg_snake(void)
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{
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static int snakefreq;
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int cur = snakestate;
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snakefreq++;
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if ((snakefreq % freq))
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return;
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WRITE(IQ80321_7SEG_MSB, snakemap[cur][0]);
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WRITE(IQ80321_7SEG_LSB, snakemap[cur][1]);
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snakestate = (cur + 1) & 7;
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}
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struct iq31244_7seg_softc {
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device_t dev;
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};
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static int
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iq31244_7seg_probe(device_t dev)
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{
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device_set_desc(dev, "IQ31244 7seg");
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return (0);
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}
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extern void (*i80321_hardclock_hook)(void);
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static int
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iq31244_7seg_attach(device_t dev)
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{
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i80321_hardclock_hook = iq31244_7seg_snake;
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return (0);
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}
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static device_method_t iq31244_7seg_methods[] = {
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DEVMETHOD(device_probe, iq31244_7seg_probe),
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DEVMETHOD(device_attach, iq31244_7seg_attach),
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{0, 0},
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};
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static driver_t iq31244_7seg_driver = {
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"iqseg",
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iq31244_7seg_methods,
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sizeof(struct iq31244_7seg_softc),
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};
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static devclass_t iq31244_7seg_devclass;
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DRIVER_MODULE(iqseg, iq, iq31244_7seg_driver, iq31244_7seg_devclass, 0, 0);
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