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   1 /*
   2  * Copyright © 2012 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_radio_spi.h>
  21 #include <ao_radio_cmac.h>
  22
  23 static struct ao_radio_spi_reply ao_radio_spi_reply;
  24
  25 static struct ao_radio_spi_request ao_radio_spi_request;
  26
  27 static uint8_t  slave_state;
  28
  29 static void
  30 ao_radio_slave_low(void)
  31 {
  32         uint16_t        i;
  33
  34         if (slave_state != 1)
  35                 ao_panic(1);
  36         ao_gpio_set(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 0);
  37         for (i = 0; i < 1000; i++)
  38                 ao_arch_nop();
  39         slave_state = 0;
  40 }
  41
  42 static void
  43 ao_radio_slave_high(void)
  44 {
  45         if (slave_state != 0)
  46                 ao_panic(2);
  47         ao_gpio_set(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 1);
  48         slave_state = 1;
  49 }
  50
  51 static void
  52 ao_radio_slave_spi(void)
  53 {
  54         ao_spi_get_slave(AO_RADIO_SLAVE_BUS);
  55         for (;;) {
  56                 ao_spi_recv(&ao_radio_spi_request,
  57                             (2 << 13) | sizeof (ao_radio_spi_request),
  58                             AO_RADIO_SLAVE_BUS);
  59                 ao_radio_slave_high();
  60                 ao_spi_recv_wait();
  61                 switch (ao_radio_spi_request.request) {
  62                 case AO_RADIO_SPI_RECV:
  63
  64                         /* XXX monitor CS to interrupt the receive */
  65
  66                         ao_config.radio_setting = ao_radio_spi_request.setting;
  67                         ao_led_on(AO_LED_RX);
  68                         ao_radio_spi_reply.status = ao_radio_recv(&ao_radio_spi_reply.payload,
  69                                                                   ao_radio_spi_request.recv_len,
  70                                                                   ao_radio_spi_request.timeout);
  71                         ao_led_off(AO_LED_RX);
  72                         ao_radio_spi_reply.rssi = 0;
  73                         ao_spi_send(&ao_radio_spi_reply,
  74                                     AO_RADIO_SPI_REPLY_HEADER_LEN + ao_radio_spi_request.recv_len,
  75                                     AO_RADIO_SLAVE_BUS);
  76                         ao_radio_slave_low();
  77                         ao_spi_send_wait();
  78                         continue;
  79                 case AO_RADIO_SPI_CMAC_RECV:
  80                         ao_config.radio_setting = ao_radio_spi_request.setting;
  81                         ao_led_on(AO_LED_RX);
  82                         ao_radio_spi_reply.status = ao_radio_cmac_recv(&ao_radio_spi_reply.payload,
  83                                                                        ao_radio_spi_request.recv_len,
  84                                                                        ao_radio_spi_request.timeout);
  85                         ao_led_off(AO_LED_RX);
  86                         ao_radio_spi_reply.rssi = ao_radio_cmac_rssi;
  87                         ao_spi_send(&ao_radio_spi_reply,
  88                                     AO_RADIO_SPI_REPLY_HEADER_LEN + ao_radio_spi_request.recv_len,
  89                                     AO_RADIO_SLAVE_BUS);
  90                         ao_radio_slave_low();
  91                         ao_spi_send_wait();
  92                         continue;
  93                 case AO_RADIO_SPI_SEND:
  94                         ao_config.radio_setting = ao_radio_spi_request.setting;
  95                         ao_led_on(AO_LED_TX);
  96                         ao_radio_send(&ao_radio_spi_request.payload,
  97                                       ao_radio_spi_request.len - AO_RADIO_SPI_REQUEST_HEADER_LEN);
  98                         ao_led_off(AO_LED_TX);
  99                         break;
 100
 101                 case AO_RADIO_SPI_CMAC_SEND:
 102                         ao_config.radio_setting = ao_radio_spi_request.setting;
 103                         ao_led_on(AO_LED_TX);
 104                         ao_radio_cmac_send(&ao_radio_spi_request.payload,
 105                                            ao_radio_spi_request.len - AO_RADIO_SPI_REQUEST_HEADER_LEN);
 106                         ao_led_off(AO_LED_TX);
 107                         break;
 108
 109                 case AO_RADIO_SPI_CMAC_KEY:
 110                         ao_xmemcpy(&ao_config.aes_key, ao_radio_spi_request.payload, AO_AES_LEN);
 111                         break;
 112
 113                 case AO_RADIO_SPI_TEST_ON:
 114                         ao_config.radio_setting = ao_radio_spi_request.setting;
 115                         ao_radio_test(1);
 116                         break;
 117
 118                 case AO_RADIO_SPI_TEST_OFF:
 119                         ao_radio_test(0);
 120                         break;
 121                 }
 122                 ao_radio_slave_low();
 123         }
 124 }
 125
 126 static struct ao_task ao_radio_slave_spi_task;
 127
 128 void
 129 ao_radio_slave_init(void)
 130 {
 131         ao_add_task(&ao_radio_slave_spi_task, ao_radio_slave_spi, "radio_spi");
 132         ao_enable_output(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 0);
 133 }