diff options
Diffstat (limited to 'src/drivers/hott_telemetry/hott_telemetry_main.c')
-rw-r--r-- | src/drivers/hott_telemetry/hott_telemetry_main.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/src/drivers/hott_telemetry/hott_telemetry_main.c b/src/drivers/hott_telemetry/hott_telemetry_main.c new file mode 100644 index 000000000..a13a6ef58 --- /dev/null +++ b/src/drivers/hott_telemetry/hott_telemetry_main.c @@ -0,0 +1,306 @@ +/**************************************************************************** + * + * Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved. + * Author: Simon Wilks <sjwilks@gmail.com> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name PX4 nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/** + * @file hott_telemetry_main.c + * @author Simon Wilks <sjwilks@gmail.com> + * + * Graupner HoTT Telemetry implementation. + * + * The HoTT receiver polls each device at a regular interval at which point + * a data packet can be returned if necessary. + * + * TODO: Add support for at least the vario and GPS sensor data. + */ + +#include <fcntl.h> +#include <nuttx/config.h> +#include <poll.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <termios.h> +#include <sys/ioctl.h> +#include <unistd.h> +#include <systemlib/systemlib.h> + +#include "messages.h" + +static int thread_should_exit = false; /**< Deamon exit flag */ +static int thread_running = false; /**< Deamon status flag */ +static int deamon_task; /**< Handle of deamon task / thread */ +static char *daemon_name = "hott_telemetry"; +static char *commandline_usage = "usage: hott_telemetry start|status|stop [-d <device>]"; + + +/* A little console messaging experiment - console helper macro */ +#define FATAL_MSG(_msg) fprintf(stderr, "[%s] %s\n", daemon_name, _msg); exit(1); +#define ERROR_MSG(_msg) fprintf(stderr, "[%s] %s\n", daemon_name, _msg); +#define INFO_MSG(_msg) printf("[%s] %s\n", daemon_name, _msg); +/** + * Deamon management function. + */ +__EXPORT int hott_telemetry_main(int argc, char *argv[]); + +/** + * Mainloop of deamon. + */ +int hott_telemetry_thread_main(int argc, char *argv[]); + +static int read_data(int uart, int *id); +static int send_data(int uart, uint8_t *buffer, int size); + +static int open_uart(const char *device, struct termios *uart_config_original) +{ + /* baud rate */ + int speed = B19200; + int uart; + + /* open uart */ + uart = open(device, O_RDWR | O_NOCTTY); + + if (uart < 0) { + char msg[80]; + sprintf(msg, "Error opening port: %s\n", device); + FATAL_MSG(msg); + } + + /* Try to set baud rate */ + struct termios uart_config; + int termios_state; + + /* Back up the original uart configuration to restore it after exit */ + char msg[80]; + + if ((termios_state = tcgetattr(uart, uart_config_original)) < 0) { + sprintf(msg, "Error getting baudrate / termios config for %s: %d\n", device, termios_state); + close(uart); + FATAL_MSG(msg); + } + + /* Fill the struct for the new configuration */ + tcgetattr(uart, &uart_config); + + /* Clear ONLCR flag (which appends a CR for every LF) */ + uart_config.c_oflag &= ~ONLCR; + + /* Set baud rate */ + if (cfsetispeed(&uart_config, speed) < 0 || cfsetospeed(&uart_config, speed) < 0) { + sprintf(msg, "Error setting baudrate / termios config for %s: %d (cfsetispeed, cfsetospeed)\n", + device, termios_state); + close(uart); + FATAL_MSG(msg); + } + + if ((termios_state = tcsetattr(uart, TCSANOW, &uart_config)) < 0) { + sprintf(msg, "Error setting baudrate / termios config for %s (tcsetattr)\n", device); + close(uart); + FATAL_MSG(msg); + } + + /* Activate single wire mode */ + ioctl(uart, TIOCSSINGLEWIRE, SER_SINGLEWIRE_ENABLED); + + return uart; +} + +int read_data(int uart, int *id) +{ + const int timeout = 1000; + struct pollfd fds[] = { { .fd = uart, .events = POLLIN } }; + + char mode; + + if (poll(fds, 1, timeout) > 0) { + /* Get the mode: binary or text */ + read(uart, &mode, 1); + /* Read the device ID being polled */ + read(uart, id, 1); + + /* if we have a binary mode request */ + if (mode != BINARY_MODE_REQUEST_ID) { + return ERROR; + } + + } else { + ERROR_MSG("UART timeout on TX/RX port"); + return ERROR; + } + + return OK; +} + +int send_data(int uart, uint8_t *buffer, int size) +{ + usleep(POST_READ_DELAY_IN_USECS); + + uint16_t checksum = 0; + + for (int i = 0; i < size; i++) { + if (i == size - 1) { + /* Set the checksum: the first uint8_t is taken as the checksum. */ + buffer[i] = checksum & 0xff; + + } else { + checksum += buffer[i]; + } + + write(uart, &buffer[i], 1); + + /* Sleep before sending the next byte. */ + usleep(POST_WRITE_DELAY_IN_USECS); + } + + /* A hack the reads out what was written so the next read from the receiver doesn't get it. */ + /* TODO: Fix this!! */ + uint8_t dummy[size]; + read(uart, &dummy, size); + + return OK; +} + +int hott_telemetry_thread_main(int argc, char *argv[]) +{ + INFO_MSG("starting"); + + thread_running = true; + + char *device = "/dev/ttyS1"; /**< Default telemetry port: USART2 */ + + /* read commandline arguments */ + for (int i = 0; i < argc && argv[i]; i++) { + if (strcmp(argv[i], "-d") == 0 || strcmp(argv[i], "--device") == 0) { //device set + if (argc > i + 1) { + device = argv[i + 1]; + + } else { + thread_running = false; + ERROR_MSG("missing parameter to -d"); + ERROR_MSG(commandline_usage); + exit(1); + } + } + } + + /* enable UART, writes potentially an empty buffer, but multiplexing is disabled */ + struct termios uart_config_original; + int uart = open_uart(device, &uart_config_original); + + if (uart < 0) { + ERROR_MSG("Failed opening HoTT UART, exiting."); + thread_running = false; + exit(ERROR); + } + + messages_init(); + + uint8_t buffer[MESSAGE_BUFFER_SIZE]; + int size = 0; + int id = 0; + + while (!thread_should_exit) { + if (read_data(uart, &id) == OK) { + switch (id) { + case ELECTRIC_AIR_MODULE: + build_eam_response(buffer, &size); + break; + + default: + continue; // Not a module we support. + } + + send_data(uart, buffer, size); + } + } + + INFO_MSG("exiting"); + + close(uart); + + thread_running = false; + + return 0; +} + +/** + * Process command line arguments and tart the daemon. + */ +int hott_telemetry_main(int argc, char *argv[]) +{ + if (argc < 1) { + ERROR_MSG("missing command"); + ERROR_MSG(commandline_usage); + exit(1); + } + + if (!strcmp(argv[1], "start")) { + + if (thread_running) { + INFO_MSG("deamon already running"); + exit(0); + } + + thread_should_exit = false; + deamon_task = task_spawn("hott_telemetry", + SCHED_DEFAULT, + SCHED_PRIORITY_MAX - 40, + 2048, + hott_telemetry_thread_main, + (argv) ? (const char **)&argv[2] : (const char **)NULL); + exit(0); + } + + if (!strcmp(argv[1], "stop")) { + thread_should_exit = true; + exit(0); + } + + if (!strcmp(argv[1], "status")) { + if (thread_running) { + INFO_MSG("daemon is running"); + + } else { + INFO_MSG("daemon not started"); + } + + exit(0); + } + + ERROR_MSG("unrecognized command"); + ERROR_MSG(commandline_usage); + exit(1); +} + + + |