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   1 /*
   2  * Copyright © 2011 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 #include <ao.h>
  20 #include <ao_companion.h>
  21
  22 #ifdef TELEMEGA
  23 #define ao_spi_slow(b)
  24 #define ao_spi_fast(b)
  25 #endif
  26
  27 #if !HAS_COMPANION
  28 #error HAS_COMPANION not set in ao_companion.c
  29 #endif
  30
  31 #define COMPANION_SELECT()      do {                    \
  32                 ao_spi_get_bit(AO_COMPANION_CS_PORT,    \
  33                                AO_COMPANION_CS_PIN,     \
  34                                AO_COMPANION_SPI_BUS,    \
  35                                AO_SPI_SPEED_200kHz);    \
  36         } while (0)
  37
  38 #define COMPANION_DESELECT()    do {                    \
  39                 ao_spi_put_bit(AO_COMPANION_CS_PORT,    \
  40                                AO_COMPANION_CS_PIN,     \
  41                                AO_COMPANION_SPI_BUS);   \
  42         } while (0)
  43
  44 struct ao_companion_command             ao_companion_command;
  45 struct ao_companion_setup               ao_companion_setup;
  46
  47 uint16_t        ao_companion_data[AO_COMPANION_MAX_CHANNELS];
  48 uint8_t         ao_companion_running;
  49 uint8_t         ao_companion_mutex;
  50
  51 static void
  52 ao_companion_send_command(uint8_t command)
  53 {
  54         ao_companion_command.command = command;
  55         ao_companion_command.flight_state = ao_flight_state;
  56         ao_companion_command.tick = ao_time();
  57         ao_companion_command.serial = ao_serial_number;
  58         ao_companion_command.flight = ao_flight_number;
  59         ao_companion_command.accel = ao_accel;
  60         ao_companion_command.speed = ao_speed;
  61         ao_companion_command.height = ao_height;
  62         ao_companion_command.motor_number = ao_motor_number;
  63         ao_spi_send(&ao_companion_command, sizeof (ao_companion_command), AO_COMPANION_SPI_BUS);
  64 }
  65
  66 static uint8_t
  67 ao_companion_get_setup(void)
  68 {
  69         COMPANION_SELECT();
  70         ao_companion_send_command(AO_COMPANION_SETUP);
  71         ao_spi_recv(&ao_companion_setup, sizeof (ao_companion_setup), AO_COMPANION_SPI_BUS);
  72         COMPANION_DESELECT();
  73         return ((int16_t) ao_companion_setup.board_id ==
  74                 (int16_t) (uint16_t) (~ao_companion_setup.board_id_inverse));
  75 }
  76
  77 static void
  78 ao_companion_get_data(void)
  79 {
  80         COMPANION_SELECT();
  81         ao_companion_send_command(AO_COMPANION_FETCH);
  82         ao_mutex_get(&ao_companion_mutex);
  83         ao_spi_recv(&ao_companion_data, ao_companion_setup.channels * 2, AO_COMPANION_SPI_BUS);
  84         ao_mutex_put(&ao_companion_mutex);
  85         COMPANION_DESELECT();
  86 }
  87
  88 static void
  89 ao_companion_notify(void)
  90 {
  91         COMPANION_SELECT();
  92         ao_companion_send_command(AO_COMPANION_NOTIFY);
  93         COMPANION_DESELECT();
  94 }
  95
  96 static void
  97 ao_companion(void)
  98 {
  99         uint8_t i;
 100         while (!ao_flight_number)
 101                 ao_sleep(&ao_flight_number);
 102         for (i = 0; i < 10; i++) {
 103                 ao_delay(AO_SEC_TO_TICKS(1));
 104                 if ((ao_companion_running = ao_companion_get_setup()))
 105                     break;
 106         }
 107         while (ao_companion_running) {
 108                 if (ao_sleep_for(&ao_flight_state, ao_companion_setup.update_period))
 109                         ao_companion_get_data();
 110                 else
 111                         ao_companion_notify();
 112         }
 113         ao_exit();
 114 }
 115
 116 static void
 117 ao_companion_status(void)
 118 {
 119         uint8_t i;
 120         printf("Companion running: %d\n", ao_companion_running);
 121         if (!ao_companion_running)
 122                 return;
 123         printf("device: %d\n"
 124                "update period: %d\n"
 125                "channels: %d\n"
 126                "data:",
 127                ao_companion_setup.board_id,
 128                ao_companion_setup.update_period,
 129                ao_companion_setup.channels);
 130         for(i = 0; i < ao_companion_setup.channels; i++)
 131                 printf(" %5u", ao_companion_data[i]);
 132         printf("\n");
 133 }
 134
 135 const struct ao_cmds ao_companion_cmds[] = {
 136         { ao_companion_status,  "L\0Companion link status" },
 137         { 0, NULL },
 138 };
 139
 140 static struct ao_task ao_companion_task;
 141
 142 void
 143 ao_companion_init(void)
 144 {
 145         ao_enable_output(AO_COMPANION_CS_PORT, AO_COMPANION_CS_PIN, 1);
 146         ao_cmd_register(&ao_companion_cmds[0]);
 147         ao_add_task(&ao_companion_task, ao_companion, "companion");
 148 }