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   1 /*
   2  * Copyright © 2009 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
  20 __xdata struct ao_packet_recv ao_rx_packet;
  21 __xdata struct ao_packet ao_tx_packet;
  22 __pdata uint8_t ao_packet_rx_len, ao_packet_rx_used, ao_packet_tx_used;
  23
  24 static __xdata char tx_data[AO_PACKET_MAX];
  25 static __xdata char rx_data[AO_PACKET_MAX];
  26 static __pdata uint8_t rx_seq;
  27
  28 __xdata struct ao_task  ao_packet_task;
  29 __xdata uint8_t ao_packet_enable;
  30 __xdata uint8_t ao_packet_master_sleeping;
  31
  32 void
  33 ao_packet_send(void)
  34 {
  35         ao_led_on(AO_LED_RED);
  36         ao_radio_get();
  37
  38         /* If any tx data is pending then copy it into the tx packet */
  39         if (ao_packet_tx_used && ao_tx_packet.len == 0) {
  40                 memcpy(&ao_tx_packet.d, tx_data, ao_packet_tx_used);
  41                 ao_tx_packet.len = ao_packet_tx_used;
  42                 ao_tx_packet.seq++;
  43                 ao_packet_tx_used = 0;
  44                 ao_wakeup(&tx_data);
  45         }
  46         ao_radio_done = 0;
  47         ao_dma_set_transfer(ao_radio_dma,
  48                             &ao_tx_packet,
  49                             &RFDXADDR,
  50                             sizeof (struct ao_packet),
  51                             DMA_CFG0_WORDSIZE_8 |
  52                             DMA_CFG0_TMODE_SINGLE |
  53                             DMA_CFG0_TRIGGER_RADIO,
  54                             DMA_CFG1_SRCINC_1 |
  55                             DMA_CFG1_DESTINC_0 |
  56                             DMA_CFG1_PRIORITY_HIGH);
  57         ao_dma_start(ao_radio_dma);
  58         RFST = RFST_STX;
  59         __critical while (!ao_radio_done)
  60                 ao_sleep(&ao_radio_done);
  61         ao_radio_put();
  62         ao_led_off(AO_LED_RED);
  63 }
  64
  65 uint8_t
  66 ao_packet_recv(void)
  67 {
  68         uint8_t dma_done;
  69
  70         ao_led_on(AO_LED_GREEN);
  71         ao_radio_get();
  72         ao_dma_set_transfer(ao_radio_dma,
  73                             &RFDXADDR,
  74                             &ao_rx_packet,
  75                             sizeof (struct ao_packet_recv),
  76                             DMA_CFG0_WORDSIZE_8 |
  77                             DMA_CFG0_TMODE_SINGLE |
  78                             DMA_CFG0_TRIGGER_RADIO,
  79                             DMA_CFG1_SRCINC_0 |
  80                             DMA_CFG1_DESTINC_1 |
  81                             DMA_CFG1_PRIORITY_HIGH);
  82         ao_dma_start(ao_radio_dma);
  83         RFST = RFST_SRX;
  84         __critical while (!ao_radio_dma_done)
  85                            if (ao_sleep(&ao_radio_dma_done) != 0)
  86                                    ao_radio_abort();
  87         dma_done = ao_radio_dma_done;
  88         ao_radio_put();
  89         ao_led_off(AO_LED_GREEN);
  90
  91         if (dma_done & AO_DMA_DONE) {
  92                 if (!(ao_rx_packet.status & PKT_APPEND_STATUS_1_CRC_OK))
  93                         return AO_DMA_ABORTED;
  94                 if (ao_rx_packet.packet.len == AO_PACKET_SYN) {
  95                         rx_seq = ao_rx_packet.packet.seq;
  96                         ao_tx_packet.seq = ao_rx_packet.packet.ack;
  97                         ao_tx_packet.ack = rx_seq;
  98                 } else if (ao_rx_packet.packet.len) {
  99                         if (ao_rx_packet.packet.seq == (uint8_t) (rx_seq + (uint8_t) 1) && ao_packet_rx_used == ao_packet_rx_len) {
 100                                 memcpy(rx_data, ao_rx_packet.packet.d, ao_rx_packet.packet.len);
 101                                 ao_packet_rx_used = 0;
 102                                 ao_packet_rx_len = ao_rx_packet.packet.len;
 103                                 rx_seq = ao_rx_packet.packet.seq;
 104                                 ao_tx_packet.ack = rx_seq;
 105                                 ao_wakeup(&ao_stdin_ready);
 106                         }
 107                 }
 108                 if (ao_rx_packet.packet.ack == ao_tx_packet.seq) {
 109                         ao_tx_packet.len = 0;
 110                         ao_wakeup(&ao_tx_packet);
 111                 }
 112         }
 113         return dma_done;
 114 }
 115
 116 void
 117 ao_packet_flush(void)
 118 {
 119         /* If there is data to send, and this is the master,
 120          * then poke the master to send all queued data
 121          */
 122         if (ao_packet_tx_used && ao_packet_master_sleeping)
 123                 ao_wake_task(&ao_packet_task);
 124 }
 125
 126 void
 127 ao_packet_putchar(char c) __reentrant
 128 {
 129         while (ao_packet_tx_used == AO_PACKET_MAX && ao_packet_enable) {
 130                 ao_packet_flush();
 131                 ao_sleep(&tx_data);
 132         }
 133
 134         if (ao_packet_enable)
 135                 tx_data[ao_packet_tx_used++] = c;
 136 }
 137
 138 char
 139 ao_packet_pollchar(void) __critical
 140 {
 141         if (!ao_packet_enable)
 142                 return AO_READ_AGAIN;
 143
 144         if (ao_packet_rx_used == ao_packet_rx_len)
 145                 return AO_READ_AGAIN;
 146
 147         return rx_data[ao_packet_rx_used++];
 148 }