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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; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 #include <ao.h>
  19 #include <ao_radio_spi.h>
  20 #include <ao_radio_cmac.h>
  21
  22 static __xdata struct ao_radio_spi_reply ao_radio_spi_reply;
  23
  24 static __xdata struct ao_radio_spi_request ao_radio_spi_request;
  25
  26 static __xdata uint8_t  ao_radio_spi_recv_request;
  27 static __xdata uint8_t  ao_radio_spi_recv_len;
  28 static __xdata uint16_t ao_radio_spi_recv_timeout;
  29
  30 static void
  31 ao_radio_slave_signal(void)
  32 {
  33         ao_gpio_set(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 0);
  34         ao_arch_nop();
  35         ao_arch_nop();
  36         ao_arch_nop();
  37         ao_gpio_set(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 0);
  38 }
  39
  40 static void
  41 ao_radio_slave_spi(void)
  42 {
  43         for (;;) {
  44                 ao_spi_get_slave(AO_RADIO_SLAVE_BUS);
  45                 ao_spi_recv(&ao_radio_spi_request, (2 << 13) | sizeof (ao_radio_spi_request), AO_RADIO_SLAVE_BUS);
  46                 ao_spi_put_slave(AO_RADIO_SLAVE_BUS);
  47                 ao_led_for(AO_LED_RED, AO_MS_TO_TICKS(1000));
  48                 switch (ao_radio_spi_request.request) {
  49                 case AO_RADIO_SPI_RECV:
  50                 case AO_RADIO_SPI_CMAC_RECV:
  51                         ao_config.radio_setting = ao_radio_spi_request.setting;
  52                         ao_radio_spi_recv_request = ao_radio_spi_request.request;
  53                         ao_radio_spi_recv_len = ao_radio_spi_request.recv_len;
  54                         ao_radio_spi_recv_timeout = ao_radio_spi_request.timeout;
  55                         ao_wakeup(&ao_radio_spi_recv_len);
  56                         break;
  57                 case AO_RADIO_SPI_RECV_FETCH:
  58                         ao_spi_get_slave(AO_RADIO_SLAVE_BUS);
  59                         ao_spi_send(&ao_radio_spi_reply,
  60                                     ao_radio_spi_request.recv_len + AO_RADIO_SPI_REPLY_HEADER_LEN,
  61                                     AO_RADIO_SLAVE_BUS);
  62                         ao_spi_put_slave(AO_RADIO_SLAVE_BUS);
  63                         break;
  64                 case AO_RADIO_SPI_RECV_ABORT:
  65                         ao_radio_recv_abort();
  66                         break;
  67                 case AO_RADIO_SPI_SEND:
  68                         ao_config.radio_setting = ao_radio_spi_request.setting;
  69                         ao_radio_send(&ao_radio_spi_request.payload, ao_radio_spi_request.len - AO_RADIO_SPI_REQUEST_HEADER_LEN);
  70                         ao_radio_slave_signal();
  71                         break;
  72
  73                 case AO_RADIO_SPI_CMAC_SEND:
  74                         ao_config.radio_setting = ao_radio_spi_request.setting;
  75                         ao_radio_cmac_send(&ao_radio_spi_request.payload, ao_radio_spi_request.len - AO_RADIO_SPI_REQUEST_HEADER_LEN);
  76                         ao_radio_slave_signal();
  77                         break;
  78
  79                 case AO_RADIO_SPI_CMAC_KEY:
  80                         ao_xmemcpy(&ao_config.aes_key, ao_radio_spi_request.payload, AO_AES_LEN);
  81                         ao_radio_slave_signal();
  82                         break;
  83
  84                 case AO_RADIO_SPI_TEST_ON:
  85                         ao_radio_test(1);
  86                         ao_radio_slave_signal();
  87                         break;
  88
  89                 case AO_RADIO_SPI_TEST_OFF:
  90                         ao_radio_test(0);
  91                         ao_radio_slave_signal();
  92                         break;
  93                 }
  94         }
  95 }
  96
  97 static void
  98 ao_radio_slave_recv(void)
  99 {
 100         uint8_t len;
 101         for (;;) {
 102                 while (!ao_radio_spi_recv_len)
 103                         ao_sleep(&ao_radio_spi_recv_len);
 104                 len = ao_radio_spi_recv_len;
 105                 ao_radio_spi_recv_len = 0;
 106                 if (ao_radio_spi_recv_request == AO_RADIO_SPI_RECV) {
 107                         ao_radio_spi_reply.status = ao_radio_recv(&ao_radio_spi_reply.payload, len);
 108                         ao_radio_spi_reply.rssi = 0;
 109                 } else {
 110                         ao_radio_spi_reply.status = ao_radio_cmac_recv(&ao_radio_spi_reply.payload, len,
 111                                                                        ao_radio_spi_recv_timeout);
 112                         ao_radio_spi_reply.rssi = ao_radio_cmac_rssi;
 113                 }
 114                 ao_radio_slave_signal();
 115         }
 116 }
 117
 118 static __xdata struct ao_task ao_radio_slave_spi_task;
 119 static __xdata struct ao_task ao_radio_slave_recv_task;
 120
 121 void
 122 ao_radio_slave_init(void)
 123 {
 124         ao_add_task(&ao_radio_slave_spi_task, ao_radio_slave_spi, "radio_spi");
 125         ao_add_task(&ao_radio_slave_recv_task, ao_radio_slave_recv, "radio_recv");
 126         ao_enable_output(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 1);
 127 }