IM920.cpp

00001 /* Copyright (C) 2014 Suga, MIT License
00002  *
00003  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00004  * and associated documentation files (the "Software"), to deal in the Software without restriction,
00005  * including without limitation the rights to use, copy, modify, merge, publish, distribute,
00006  * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
00007  * furnished to do so, subject to the following conditions:
00008  *
00009  * The above copyright notice and this permission notice shall be included in all copies or
00010  * substantial portions of the Software.
00011  *
00012  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00013  * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00014  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00015  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00016  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00017  */
00018 #include "IM920.h"
00019 
00020 IM920::IM920 (PinName tx, PinName rx, PinName busy, PinName reset, int baud) : _im(tx, rx) {
00021 
00022     memset(&_state, 0, sizeof(_state));
00023     _state.data = new CircBuffer<char>(CFG_DATA_SIZE);
00024 
00025     initUart(busy, reset, baud);
00026     setReset(true);
00027     wait_ms(100);
00028     setReset(false);
00029 }
00030 
00031 int IM920::init () {
00032 
00033     cmdRDID();
00034     cmdRDNN();
00035     cmdSTPO(3);  // 10dBm
00036     cmdSTRT(2);  // 1.25kbps
00037     return 0;
00038 }
00039 
00040 void IM920::poll () {
00041 
00042     if (_state.received && _state.buf != NULL)
00043       if (!_state.data->isEmpty()) {
00044         _func.call();
00045         if (_state.data->isEmpty()) {
00046             _state.received = false;
00047         }
00048     }
00049 }
00050 
00051 int IM920::send (char *buf, int len) {
00052 
00053     if (len > 64) len = 64;
00054 
00055     return sendData(buf, len);
00056 }
00057 
00058 int IM920::recv (char *buf, int len) {
00059     int i;
00060 
00061     if (_state.data == NULL) return 0;
00062     while (!_state.received && _state.mode != MODE_COMMAND);
00063     _state.received = false;
00064     for (i = 0; i < len; i ++) {
00065         if (_state.data->dequeue(&buf[i]) == false) break;
00066     }
00067     return i;
00068 }