mirror of
git://projects.qi-hardware.com/f32xbase.git
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130 lines
2.3 KiB
C
130 lines
2.3 KiB
C
/*
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* f32x/boundary.c - I/O pin access
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*
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* Written 2008 by Werner Almesberger
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* Copyright 2008 Werner Almesberger
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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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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "c2.h"
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#include "boundary.h"
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#define P0 0x80
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#define P0MDOUT 0xa4
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#define P2 0xa0
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#define P2MDOUT 0xa6
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static uint8_t reg_read(uint8_t addr)
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{
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c2_addr_write(addr);
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return c2_data_read(1);
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}
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static void reg_write(uint8_t addr, uint8_t value)
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{
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c2_addr_write(addr);
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c2_data_write(value, 1);
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}
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static const char *parse(const char *s, uint8_t *port, uint8_t *mode, int bits)
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{
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int pos;
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*port = *mode = 0;
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pos = 0;
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while (pos != bits) {
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switch (*s++) {
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case '.':
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continue;
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case '1':
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*port |= 1 << pos;
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/* fall through */
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case '0':
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*mode |= 1 << pos;
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break;
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case 'r':
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case 'R':
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*port |= 1 << pos;
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break;
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case 0:
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fprintf(stderr, "not enough pin settings\n");
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exit(1);
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default:
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fprintf(stderr, "unrecognized pin setting \"%c\"\n", s[-1]);
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exit(1);
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}
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pos++;
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}
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return s;
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}
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static void setup(const char *init)
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{
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uint8_t p0, p0mdout, p2, p2mdout;
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init = parse(init, &p0, &p0mdout, 8);
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init = parse(init, &p2, &p2mdout, 6);
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if (*init) {
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fprintf(stderr, "too many pin settings\n");
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exit(1);
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}
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reg_write(P0, p0);
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reg_write(P0MDOUT, p0mdout);
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reg_write(P2, p2);
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reg_write(P2MDOUT, p2mdout);
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}
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static void print(uint8_t v, int bits)
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{
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int pos;
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for (pos = 0; pos != bits; pos++)
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putchar(v & (1 << pos) ? '1' : '0');
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}
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static void scan(void)
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{
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uint8_t p0, p2;
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p0 = reg_read(P0);
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p2 = reg_read(P2);
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print(p0, 8);
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putchar('.');
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print(p2, 6);
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putchar('\n');
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}
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static void __attribute__((unused)) dump(void)
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{
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fprintf(stderr, "GPIOCN %02x\n", reg_read(0xe2));
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fprintf(stderr, " P0 %02x\n", reg_read(P0));
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fprintf(stderr, " P0MDOUT %02x\n", reg_read(P0MDOUT));
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fprintf(stderr, " P2 %02x\n", reg_read(P2));
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fprintf(stderr, " P2MDOUT %02x\n", reg_read(P2MDOUT));
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}
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void boundary(const char *init)
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{
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//dump();
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setup(init);
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scan();
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}
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