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/*
* Copyright © 2009 Keith Packard <keithp@keithp.com>
*
* 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include "ccdbg-debug.h"
#include "cc-bitbang.h"
#include "cp-usb-async.h"
struct cc_bitbang {
struct cp_usb_async *cp_async;
};
static uint32_t cc_clock_us = CC_CLOCK_US;
static uint32_t cc_reset_us = CC_RESET_US;
void
cc_bitbang_set_clock(uint32_t us)
{
cc_clock_us = us;
}
void
cc_bitbang_half_clock(struct cc_bitbang *bb)
{
struct timespec req, rem;
req.tv_sec = (cc_clock_us / 2) / 1000000;
req.tv_nsec = ((cc_clock_us / 2) % 1000000) * 1000;
nanosleep(&req, &rem);
}
void
cc_bitbang_wait_reset(struct cc_bitbang *bb)
{
struct timespec req, rem;
cc_bitbang_sync(bb);
req.tv_sec = (cc_reset_us) / 1000000;
req.tv_nsec = ((cc_reset_us) % 1000000) * 1000;
nanosleep(&req, &rem);
}
struct cc_bitbang *
cc_bitbang_open(void)
{
struct cc_bitbang *bb;
bb = calloc(sizeof (struct cc_bitbang), 1);
if (!bb) {
perror("calloc");
return NULL;
}
bb->cp_async = cp_usb_async_open();
if (!bb->cp_async) {
free (bb);
return NULL;
}
return bb;
}
void
cc_bitbang_close(struct cc_bitbang *bb)
{
cp_usb_async_close(bb->cp_async);
free (bb);
}
void
cc_bitbang_debug_mode(struct cc_bitbang *bb)
{
/* force two rising clocks while holding RESET_N low */
ccdbg_debug(CC_DEBUG_COMMAND, "#\n");
ccdbg_debug(CC_DEBUG_COMMAND, "# Debug mode\n");
ccdbg_debug(CC_DEBUG_COMMAND, "#\n");
cc_bitbang_send(bb, CC_CLOCK|CC_DATA|CC_RESET_N, CC_CLOCK|CC_DATA|CC_RESET_N);
cc_bitbang_send(bb, CC_CLOCK|CC_DATA|CC_RESET_N, CC_DATA );
cc_bitbang_wait_reset(bb);
cc_bitbang_send(bb, CC_CLOCK|CC_DATA|CC_RESET_N, CC_CLOCK|CC_DATA );
cc_bitbang_send(bb, CC_CLOCK|CC_DATA|CC_RESET_N, CC_DATA );
cc_bitbang_send(bb, CC_CLOCK|CC_DATA|CC_RESET_N, CC_CLOCK|CC_DATA );
cc_bitbang_send(bb, CC_CLOCK|CC_DATA|CC_RESET_N, CC_DATA|CC_RESET_N);
cc_bitbang_wait_reset(bb);
}
void
cc_bitbang_reset(struct cc_bitbang *bb)
{
ccdbg_debug(CC_DEBUG_COMMAND, "#\n");
ccdbg_debug(CC_DEBUG_COMMAND, "# Reset\n");
ccdbg_debug(CC_DEBUG_COMMAND, "#\n");
cc_bitbang_send(bb, CC_CLOCK|CC_DATA|CC_RESET_N, CC_CLOCK|CC_DATA|CC_RESET_N);
cc_bitbang_send(bb, CC_CLOCK|CC_DATA|CC_RESET_N, CC_CLOCK|CC_DATA );
cc_bitbang_wait_reset(bb);
cc_bitbang_send(bb, CC_CLOCK|CC_DATA|CC_RESET_N, CC_CLOCK|CC_DATA );
cc_bitbang_send(bb, CC_CLOCK|CC_DATA|CC_RESET_N, CC_CLOCK|CC_DATA );
cc_bitbang_send(bb, CC_CLOCK|CC_DATA|CC_RESET_N, CC_CLOCK|CC_DATA );
cc_bitbang_send(bb, CC_CLOCK|CC_DATA|CC_RESET_N, CC_CLOCK|CC_DATA|CC_RESET_N);
cc_bitbang_wait_reset(bb);
}
int
cc_bitbang_write(struct cc_bitbang *bb, uint8_t mask, uint8_t value)
{
cp_usb_async_write(bb->cp_async, mask, value);
return 0;
}
void
cc_bitbang_read(struct cc_bitbang *bb, uint8_t *valuep)
{
cp_usb_async_read(bb->cp_async, valuep);
}
void
cc_bitbang_sync(struct cc_bitbang *bb)
{
cp_usb_async_sync(bb->cp_async);
}
static char
is_bit(uint8_t get, uint8_t mask, char on, uint8_t bit)
{
if (mask&bit) {
if (get&bit)
return on;
else
return '.';
} else
return '-';
}
void
cc_bitbang_print(char *format, uint8_t mask, uint8_t set)
{
ccdbg_debug (CC_DEBUG_BITBANG, format,
is_bit(set, mask, 'C', CC_CLOCK),
is_bit(set, mask, 'D', CC_DATA),
is_bit(set, mask, 'R', CC_RESET_N));
}
void
cc_bitbang_send(struct cc_bitbang *bb, uint8_t mask, uint8_t set)
{
cc_bitbang_write(bb, mask, set);
cc_bitbang_print("%c %c %c\n", mask, set);
cc_bitbang_half_clock(bb);
}
void
cc_bitbang_send_bit(struct cc_bitbang *bb, uint8_t bit)
{
if (bit) bit = CC_DATA;
cc_bitbang_send(bb, CC_CLOCK|CC_DATA|CC_RESET_N, CC_CLOCK|bit|CC_RESET_N);
cc_bitbang_send(bb, CC_CLOCK|CC_DATA|CC_RESET_N, bit|CC_RESET_N);
}
void
cc_bitbang_send_byte(struct cc_bitbang *bb, uint8_t byte)
{
int bit;
ccdbg_debug(CC_DEBUG_BITBANG, "#\n# Send Byte 0x%02x\n#\n", byte);
for (bit = 7; bit >= 0; bit--) {
cc_bitbang_send_bit(bb, (byte >> bit) & 1);
if (bit == 3)
ccdbg_debug(CC_DEBUG_BITBANG, "\n");
}
cc_bitbang_sync(bb);
}
void
cc_bitbang_send_bytes(struct cc_bitbang *bb, uint8_t *bytes, int nbytes)
{
while (nbytes--)
cc_bitbang_send_byte(bb, *bytes++);
}
void
cc_bitbang_recv_bit(struct cc_bitbang *bb, int first, uint8_t *bit)
{
uint8_t mask = first ? CC_DATA : 0;
cc_bitbang_send(bb, CC_CLOCK|mask|CC_RESET_N, CC_CLOCK|CC_DATA|CC_RESET_N);
cc_bitbang_read(bb, bit);
cc_bitbang_send(bb, CC_CLOCK| CC_RESET_N, CC_RESET_N);
}
void
cc_bitbang_recv_byte(struct cc_bitbang *bb, int first, uint8_t *bytep)
{
uint8_t byte = 0;
uint8_t bits[8];
int bit;
ccdbg_debug(CC_DEBUG_BITBANG, "#\n# Recv byte\n#\n");
for (bit = 0; bit < 8; bit++) {
cc_bitbang_recv_bit(bb, first, &bits[bit]);
first = 0;
}
cc_bitbang_sync(bb);
for (bit = 0; bit < 8; bit++) {
byte = byte << 1;
byte |= (bits[bit] & CC_DATA) ? 1 : 0;
cc_bitbang_print("#\t%c %c %c\n", CC_DATA, bits[bit]);
if (bit == 3)
ccdbg_debug(CC_DEBUG_BITBANG, "\n");
}
ccdbg_debug(CC_DEBUG_BITBANG, "#\n# Recv 0x%02x\n#\n", byte);
*bytep = byte;
}
void
cc_bitbang_recv_bytes(struct cc_bitbang *bb, uint8_t *bytes, int nbytes)
{
int i;
int first = 1;
for (i = 0; i < nbytes; i++) {
cc_bitbang_recv_byte(bb, first, &bytes[i]);
first = 0;
}
}
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