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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, 1);
  38 }
  39
  40 static void
  41 ao_radio_slave_spi(void)
  42 {
  43         uint8_t need_signal = 0;
  44
  45         ao_spi_get_slave(AO_RADIO_SLAVE_BUS);
  46         for (;;) {
  47                 ao_spi_recv(&ao_radio_spi_request,
  48                             (2 << 13) | sizeof (ao_radio_spi_request),
  49                             AO_RADIO_SLAVE_BUS);
  50                 if (need_signal) {
  51                         ao_radio_slave_signal();
  52                         need_signal = 0;
  53                 }
  54                 ao_spi_recv_wait();
  55                 switch (ao_radio_spi_request.request) {
  56                 case AO_RADIO_SPI_RECV:
  57                 case AO_RADIO_SPI_CMAC_RECV:
  58                         ao_config.radio_setting = ao_radio_spi_request.setting;
  59                         ao_radio_spi_recv_request = ao_radio_spi_request.request;
  60                         ao_radio_spi_recv_len = ao_radio_spi_request.recv_len;
  61                         ao_radio_spi_recv_timeout = ao_radio_spi_request.timeout;
  62                         ao_wakeup(&ao_radio_spi_recv_len);
  63                         continue;
  64                 case AO_RADIO_SPI_RECV_FETCH:
  65                         ao_spi_send(&ao_radio_spi_reply,
  66                                     ao_radio_spi_request.recv_len,
  67                                     AO_RADIO_SLAVE_BUS);
  68                         ao_radio_slave_signal();
  69                         ao_spi_send_wait();
  70                         continue;
  71                 case AO_RADIO_SPI_RECV_ABORT:
  72                         ao_radio_recv_abort();
  73                         break;
  74                 case AO_RADIO_SPI_SEND:
  75                         ao_config.radio_setting = ao_radio_spi_request.setting;
  76                         ao_radio_send(&ao_radio_spi_request.payload,
  77                                       ao_radio_spi_request.len - AO_RADIO_SPI_REQUEST_HEADER_LEN);
  78                         break;
  79
  80                 case AO_RADIO_SPI_CMAC_SEND:
  81                         ao_config.radio_setting = ao_radio_spi_request.setting;
  82                         ao_radio_cmac_send(&ao_radio_spi_request.payload,
  83                                            ao_radio_spi_request.len - AO_RADIO_SPI_REQUEST_HEADER_LEN);
  84                         break;
  85
  86                 case AO_RADIO_SPI_CMAC_KEY:
  87                         ao_xmemcpy(&ao_config.aes_key, ao_radio_spi_request.payload, AO_AES_LEN);
  88                         break;
  89
  90                 case AO_RADIO_SPI_TEST_ON:
  91                         ao_config.radio_setting = ao_radio_spi_request.setting;
  92                         ao_radio_test(1);
  93                         break;
  94
  95                 case AO_RADIO_SPI_TEST_OFF:
  96                         ao_radio_test(0);
  97                         break;
  98                 }
  99                 need_signal = 1;
 100         }
 101 }
 102
 103 static void
 104 ao_radio_slave_recv(void)
 105 {
 106         uint8_t len;
 107         for (;;) {
 108                 while (!ao_radio_spi_recv_len)
 109                         ao_sleep(&ao_radio_spi_recv_len);
 110                 len = ao_radio_spi_recv_len;
 111                 ao_radio_spi_recv_len = 0;
 112                 if (ao_radio_spi_recv_request == AO_RADIO_SPI_RECV) {
 113                         ao_radio_spi_reply.status = ao_radio_recv(&ao_radio_spi_reply.payload, len);
 114                         ao_radio_spi_reply.rssi = 0;
 115                 } else {
 116                         ao_radio_spi_reply.status = ao_radio_cmac_recv(&ao_radio_spi_reply.payload, len,
 117                                                                        ao_radio_spi_recv_timeout);
 118                         ao_radio_spi_reply.rssi = ao_radio_cmac_rssi;
 119                 }
 120                 ao_radio_slave_signal();
 121         }
 122 }
 123
 124 static __xdata struct ao_task ao_radio_slave_spi_task;
 125 static __xdata struct ao_task ao_radio_slave_recv_task;
 126
 127 void
 128 ao_radio_slave_init(void)
 129 {
 130         ao_add_task(&ao_radio_slave_spi_task, ao_radio_slave_spi, "radio_spi");
 131         ao_add_task(&ao_radio_slave_recv_task, ao_radio_slave_recv, "radio_recv");
 132         ao_enable_output(AO_RADIO_SLAVE_INT_PORT, AO_RADIO_SLAVE_INT_BIT, AO_RADIO_SLAVE_INT_PIN, 1);
 133 }