mirror of
git://projects.qi-hardware.com/f32xbase.git
synced 2024-11-23 21:38:06 +02:00
131 lines
2.2 KiB
C
131 lines
2.2 KiB
C
/*
|
|
* f32x/boundary.c - I/O pin access
|
|
*
|
|
* Written 2008 by Werner Almesberger
|
|
* Copyright 2008 Werner Almesberger
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
|
|
#include "c2.h"
|
|
#include "boundary.h"
|
|
|
|
|
|
#define P0 0x80
|
|
#define P0MDOUT 0xa4
|
|
#define P2 0xa0
|
|
#define P2MDOUT 0xa6
|
|
|
|
|
|
static uint8_t reg_read(uint8_t addr)
|
|
{
|
|
c2_addr_write(addr);
|
|
return c2_data_read(1);
|
|
}
|
|
|
|
|
|
static void reg_write(uint8_t addr, uint8_t value)
|
|
{
|
|
c2_addr_write(addr);
|
|
c2_data_write(value, 1);
|
|
}
|
|
|
|
|
|
static const char *parse(const char *s, uint8_t *port, uint8_t *mode, int bits)
|
|
{
|
|
int pos;
|
|
|
|
*port = *mode = 0;
|
|
pos = 0;
|
|
while (pos != bits) {
|
|
switch (*s++) {
|
|
case '.':
|
|
continue;
|
|
case '1':
|
|
*port |= 1 << pos;
|
|
/* fall through */
|
|
case '0':
|
|
*mode |= 1 << pos;
|
|
break;
|
|
case 'r':
|
|
case 'R':
|
|
*port |= 1 << pos;
|
|
break;
|
|
case 0:
|
|
fprintf(stderr, "not enough pin settings\n");
|
|
exit(1);
|
|
default:
|
|
fprintf(stderr,
|
|
"unrecognized pin setting \"%c\"\n", s[-1]);
|
|
exit(1);
|
|
}
|
|
pos++;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
|
|
static void setup(const char *init)
|
|
{
|
|
uint8_t p0, p0mdout, p2, p2mdout;
|
|
|
|
init = parse(init, &p0, &p0mdout, 8);
|
|
init = parse(init, &p2, &p2mdout, 6);
|
|
if (*init) {
|
|
fprintf(stderr, "too many pin settings\n");
|
|
exit(1);
|
|
}
|
|
reg_write(P0, p0);
|
|
reg_write(P0MDOUT, p0mdout);
|
|
reg_write(P2, p2);
|
|
reg_write(P2MDOUT, p2mdout);
|
|
}
|
|
|
|
|
|
static void print(uint8_t v, int bits)
|
|
{
|
|
int pos;
|
|
|
|
for (pos = 0; pos != bits; pos++)
|
|
putchar(v & (1 << pos) ? '1' : '0');
|
|
}
|
|
|
|
|
|
static void scan(void)
|
|
{
|
|
uint8_t p0, p2;
|
|
|
|
p0 = reg_read(P0);
|
|
p2 = reg_read(P2);
|
|
print(p0, 8);
|
|
putchar('.');
|
|
print(p2, 6);
|
|
putchar('\n');
|
|
}
|
|
|
|
|
|
static void __attribute__((unused)) dump(void)
|
|
{
|
|
fprintf(stderr, "GPIOCN %02x\n", reg_read(0xe2));
|
|
fprintf(stderr, " P0 %02x\n", reg_read(P0));
|
|
fprintf(stderr, " P0MDOUT %02x\n", reg_read(P0MDOUT));
|
|
fprintf(stderr, " P2 %02x\n", reg_read(P2));
|
|
fprintf(stderr, " P2MDOUT %02x\n", reg_read(P2MDOUT));
|
|
}
|
|
|
|
|
|
void boundary(const char *init)
|
|
{
|
|
//dump();
|
|
setup(init);
|
|
scan();
|
|
}
|