bluez/tools/csr_bcsp.c

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/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
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* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
*
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <errno.h>
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#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdint.h>
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#include <termios.h>
#include "csr.h"
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#include "ubcsp.h"
static uint16_t seqnum = 0x0000;
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static int fd = -1;
static struct ubcsp_packet send_packet;
static uint8_t send_buffer[512];
static struct ubcsp_packet receive_packet;
static uint8_t receive_buffer[512];
int csr_open_bcsp(char *device, speed_t bcsp_rate)
{
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struct termios ti;
uint8_t delay, activity = 0x00;
int timeout = 0;
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if (!device)
device = "/dev/ttyS0";
fd = open(device, O_RDWR | O_NOCTTY);
if (fd < 0) {
fprintf(stderr, "Can't open serial port: %s (%d)\n",
strerror(errno), errno);
return -1;
}
tcflush(fd, TCIOFLUSH);
if (tcgetattr(fd, &ti) < 0) {
fprintf(stderr, "Can't get port settings: %s (%d)\n",
strerror(errno), errno);
close(fd);
return -1;
}
cfmakeraw(&ti);
ti.c_cflag |= CLOCAL;
ti.c_cflag &= ~CRTSCTS;
ti.c_cflag |= PARENB;
ti.c_cflag &= ~PARODD;
ti.c_cflag &= ~CSIZE;
ti.c_cflag |= CS8;
ti.c_cflag &= ~CSTOPB;
ti.c_cc[VMIN] = 1;
ti.c_cc[VTIME] = 0;
cfsetospeed(&ti, bcsp_rate);
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if (tcsetattr(fd, TCSANOW, &ti) < 0) {
fprintf(stderr, "Can't change port settings: %s (%d)\n",
strerror(errno), errno);
close(fd);
return -1;
}
tcflush(fd, TCIOFLUSH);
if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK) < 0) {
fprintf(stderr, "Can't set non blocking mode: %s (%d)\n",
strerror(errno), errno);
close(fd);
return -1;
}
memset(&send_packet, 0, sizeof(send_packet));
memset(&receive_packet, 0, sizeof(receive_packet));
ubcsp_initialize();
send_packet.length = 512;
send_packet.payload = send_buffer;
receive_packet.length = 512;
receive_packet.payload = receive_buffer;
ubcsp_receive_packet(&receive_packet);
while (1) {
delay = ubcsp_poll(&activity);
if (activity & UBCSP_PACKET_RECEIVED)
break;
if (delay) {
usleep(delay * 100);
if (timeout++ > 5000) {
fprintf(stderr, "Initialization timed out\n");
return -1;
}
}
}
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return 0;
}
void put_uart(uint8_t ch)
{
if (write(fd, &ch, 1) < 0)
fprintf(stderr, "UART write error\n");
}
uint8_t get_uart(uint8_t *ch)
{
int res = read(fd, ch, 1);
return res > 0 ? res : 0;
}
static int do_command(uint16_t command, uint16_t seqnum, uint16_t varid, uint8_t *value, uint16_t length)
{
unsigned char cp[254], rp[254];
uint8_t cmd[10];
uint16_t size;
uint8_t delay, activity = 0x00;
int timeout = 0, sent = 0;
size = (length < 8) ? 9 : ((length + 1) / 2) + 5;
cmd[0] = command & 0xff;
cmd[1] = command >> 8;
cmd[2] = size & 0xff;
cmd[3] = size >> 8;
cmd[4] = seqnum & 0xff;
cmd[5] = seqnum >> 8;
cmd[6] = varid & 0xff;
cmd[7] = varid >> 8;
cmd[8] = 0x00;
cmd[9] = 0x00;
memset(cp, 0, sizeof(cp));
cp[0] = 0x00;
cp[1] = 0xfc;
cp[2] = (size * 2) + 1;
cp[3] = 0xc2;
memcpy(cp + 4, cmd, sizeof(cmd));
memcpy(cp + 14, value, length);
receive_packet.length = 512;
ubcsp_receive_packet(&receive_packet);
send_packet.channel = 5;
send_packet.reliable = 1;
send_packet.length = (size * 2) + 4;
memcpy(send_packet.payload, cp, (size * 2) + 4);
ubcsp_send_packet(&send_packet);
while (1) {
delay = ubcsp_poll(&activity);
if (activity & UBCSP_PACKET_SENT) {
switch (varid) {
case CSR_VARID_COLD_RESET:
case CSR_VARID_WARM_RESET:
case CSR_VARID_COLD_HALT:
case CSR_VARID_WARM_HALT:
return 0;
}
sent = 1;
timeout = 0;
}
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if (activity & UBCSP_PACKET_RECEIVED) {
if (sent && receive_packet.channel == 5 &&
receive_packet.payload[0] == 0xff) {
memcpy(rp, receive_packet.payload,
receive_packet.length);
break;
}
receive_packet.length = 512;
ubcsp_receive_packet(&receive_packet);
timeout = 0;
}
if (delay) {
usleep(delay * 100);
if (timeout++ > 5000) {
fprintf(stderr, "Operation timed out\n");
return -1;
}
}
}
if (rp[0] != 0xff || rp[2] != 0xc2) {
errno = EIO;
return -1;
}
if ((rp[11] + (rp[12] << 8)) != 0) {
errno = ENXIO;
return -1;
}
memcpy(value, rp + 13, length);
return 0;
}
int csr_read_bcsp(uint16_t varid, uint8_t *value, uint16_t length)
{
return do_command(0x0000, seqnum++, varid, value, length);
}
int csr_write_bcsp(uint16_t varid, uint8_t *value, uint16_t length)
{
return do_command(0x0002, seqnum++, varid, value, length);
}
void csr_close_bcsp(void)
{
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close(fd);
}