tools/examples/chibi/receive/main.c

   1 /**************************************************************************/
   2 /*!
   3     @file     main.c
   4     @author   K. Townsend (microBuilder.eu)
   5
   6     @section LICENSE
   7
   8     Software License Agreement (BSD License)
   9
  10     Copyright (c) 2010, microBuilder SARL
  11     All rights reserved.
  12
  13     Redistribution and use in source and binary forms, with or without
  14     modification, are permitted provided that the following conditions are met:
  15     1. Redistributions of source code must retain the above copyright
  16     notice, this list of conditions and the following disclaimer.
  17     2. Redistributions in binary form must reproduce the above copyright
  18     notice, this list of conditions and the following disclaimer in the
  19     documentation and/or other materials provided with the distribution.
  20     3. Neither the name of the copyright holders nor the
  21     names of its contributors may be used to endorse or promote products
  22     derived from this software without specific prior written permission.
  23
  24     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
  25     EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  26     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  27     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
  28     DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  29     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  30     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  31     ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  32     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33     SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 */
  35 /**************************************************************************/
  36 #include "projectconfig.h"
  37 #include "sysinit.h"
  38
  39 #include "core/gpio/gpio.h"
  40 #include "drivers/rf/chibi/chb.h"
  41 #include "drivers/rf/chibi/chb_drvr.h"
  42
  43 static chb_rx_data_t rx_data;
  44
  45 /**************************************************************************/
  46 /*!
  47     Converts the ED (Energy Detection) value to dBm using the following
  48     formula: dBm = RSSI_BASE_VAL + 1.03 * ED
  49
  50     For more information see section 6.5 of the AT86RF212 datasheet
  51 */
  52 /**************************************************************************/
  53 int edToDBM(uint32_t ed)
  54 {
  55   #if CFG_CHIBI_MODE == 0 || CFG_CHIBI_MODE == 1 || CFG_CHIBI_MODE == 2
  56     // Calculate for OQPSK (RSSI Base Value = -100)
  57     int dbm = (103 * ed - 10000);
  58   #else
  59     // Calculate for BPSK (RSSI Base Value = -98)
  60     int dbm = (103 * ed - 9800);
  61   #endif
  62
  63   return dbm / 100;
  64 }
  65
  66 /**************************************************************************/
  67 /*!
  68     Constantly checks for incoming messages, and displays them using
  69     printf when they arrive.  This program will display messages sent
  70     to the global broadcast address (0xFFFF) or messages addressed to
  71     this node using it's unique 16-bit ID.
  72
  73     projectconfig.h settings:
  74     --------------------------------------------------
  75     CFG_CHIBI             -> Enabled
  76     CFG_CHIBI_PROMISCUOUS -> 0
  77     CFG_CHIBI_BUFFERSIZE  -> 128
  78 */
  79 /**************************************************************************/
  80 int main(void)
  81 {
  82   // Configure cpu and mandatory peripherals
  83   systemInit();
  84
  85   // Make sure that projectconfig.h is properly configured for this example
  86   #if !defined CFG_CHIBI
  87     #error "CFG_CHIBI must be enabled in projectconfig.h for this example"
  88   #endif
  89   #if CFG_CHIBI_PROMISCUOUS != 0
  90     #error "CFG_CHIBI_PROMISCUOUS must be set to 0 in projectconfig.h for this example"
  91   #endif
  92
  93   // Get a reference to the Chibi peripheral control block
  94   chb_pcb_t *pcb = chb_get_pcb();
  95
  96   while(1)
  97   {
  98     // Check for incoming messages
  99     while (pcb->data_rcv)
 100     {
 101       // Enable LED to indicate message reception
 102       gpioSetValue (CFG_LED_PORT, CFG_LED_PIN, CFG_LED_ON);
 103       // get the length of the data
 104       rx_data.len = chb_read(&rx_data);
 105       // make sure the length is nonzero
 106       if (rx_data.len)
 107       {
 108         int dbm = edToDBM(pcb->ed);
 109         printf("Message received from node %02X: %s, len=%d, dBm=%d.%s", rx_data.src_addr, rx_data.data, rx_data.len, dbm, CFG_PRINTF_NEWLINE);
 110       }
 111       // Disable LED
 112       gpioSetValue (CFG_LED_PORT, CFG_LED_PIN, CFG_LED_OFF);
 113     }
 114   }
 115
 116   return 0;
 117 }