John Bailey
API for communicating with XBee devices.
Dependencies: CircularBuffer FixedLengthList
Dependents: XBeeApiTest XBeeApiSimpleATCmdsExample XBeeApiBroadcastExample XBeeApiBroadcastExampleRTOS ... more
Overview
XBeeApi is intended to be a library for providing a high-level API interface to the XBee - for example getChannel() and setChannel(2) methods rather than needing to send( "ATCH" ) and send( "ATCH 2" ) - and then de-code the responses.
See the notebook page here for a description of how the API works & some details on the various classes.
Features:
- Support for transmission & reception of data packets
- Support for reading & changing settings
- Support for "Remote AT" interface to access settings & I/O channels on remote XBees
- XBeeApi should work if you're using mbed-rtos, though it is not currently threadsafe. Take a look at the XBeeApiBroadcastExampleRTOS example if you're including mbed-rtos.
Example Programs
There are also example programs available:
Transmit
Import programXBeeApiSimpleBroadcastExample
Simple example of how to use XBeeApi - set up the XBee, configure P2P networking then transmit a frame.
Last commit 06 Jul 2014 by 
John Bailey
Import programXBeeApiBroadcastExample
Example for XBeeAPI; a little more involved than XBeeApiSimpleBroadcastExample with report on failure to set up the XBee and on the transmit status of the message.
Last commit 05 Jul 2014 by John Bailey
Import programXBeeApiBroadcastExampleRTOS
Example of using the XBeeApi library to broadcast a message, based on XBeeApiBroadcastExample. This example shows how to use the library when using mbed-rtos. Before compiling you must open "XbeeApi\Config\XBeeApiCfg.hpp" and change the '#if 0' to '#if 1' on the line above the comment reading "Use RTOS features to make XBeeApi threadsafe"
Last commit 06 Jul 2014 by John Bailey
Settings/Status
Import programXBeeApiSimpleATCmdsExample
Simple example of using XBeeApi to send AT-style commands to the XBee
Last commit 31 Mar 2014 by John Bailey
Import programXBeeApiRemoteATCmdsExample
Example of using the XBeeApi library to send AT commands to remote XBee devices in order to read/write settings
Last commit 13 Jul 2014 by John Bailey
Receive
Import programXBeeApiSimpleReceiveExample
Simple example of using XBeeApi to receive data packets via wireless
Last commit 08 Jul 2014 by John Bailey
Import programXBeeApiReceiveCallbackExample
Example of using the XBeeApi library to receive a message via a callback method
Last commit 08 Jul 2014 by John Bailey
Import programXBeeApiReceiveCallbackExampleRTOS
Example of using the XBeeApi library to receive a message via a callback method. This example shows how to use the library when using mbed-rtos. See the comment at the top of main.cpp
Last commit 08 Jul 2014 by John Bailey
Remote I/O
Import programXBeeApiRemoteIOExample
Example of using the XBeeApi library to read inputs on a remote XBee
Last commit 28 Jul 2014 by John Bailey
If you have 2 mbed connected XBees available then you can use XBeeApiSimpleReceiveExample and XBeeApiSimpleBroadcastExample as a pair.
Note that this is still a work in progress! XBeeApiTodoList tracks some of the functionality still to be added.
Diff: Base/XBeeDevice.cpp
- Revision:
- 48:48397bedf95d
- Parent:
- 43:975a28e01dac
- Child:
- 49:37bba77ee73f
diff -r 5d3608835668 -r 48397bedf95d Base/XBeeDevice.cpp
--- a/Base/XBeeDevice.cpp Sun Jul 06 22:10:28 2014 +0000
+++ b/Base/XBeeDevice.cpp Mon Jul 07 19:03:09 2014 +0000
@@ -79,6 +79,9 @@
m_inAtCmdMode = false;
m_rxMsgLastWasEsc = false;
m_escape = true;
+ m_ignoreBadCsum = false;
+ m_badCsumCount = 0U;
+ m_serialBytesDiscarded = 0U;
}
XBeeDevice::XBeeDevice( PinName p_tx, PinName p_rx, PinName p_rts, PinName p_cts ): m_serialNeedsDelete( true )
@@ -193,6 +196,7 @@
( m_rxBuff[0] != XBEE_SB_FRAME_DELIMITER ))
{
m_rxBuff.chomp( 1 );
+ m_serialBytesDiscarded++;
}
do {
@@ -211,18 +215,31 @@
/* Check that we've received the entire frame */
if( len >= cmdLen )
{
- /* TODO: Verify checksum */
+ bool doProcess = true;
+
+ /* Checksum verification, performed only if it's configured */
+ if( !m_ignoreBadCsum )
+ {
+ if( !verifyFrameChecksum( cmdBuff, cmdLen ))
+ {
+ doProcess = false;
+ m_badCsumCount++;
+ }
+ }
- /* Iterate all of the decoders */
- for( FixedLengthList<XBeeApiFrameDecoder*, XBEEAPI_CONFIG_DECODER_LIST_SIZE>::iterator it = m_decoders.begin() ;
- it != m_decoders.end();
- ++it ) {
+ if( doProcess )
+ {
+ /* Iterate all of the decoders */
+ for( FixedLengthList<XBeeApiFrameDecoder*, XBEEAPI_CONFIG_DECODER_LIST_SIZE>::iterator it = m_decoders.begin() ;
+ it != m_decoders.end();
+ ++it ) {
+
+ bool processed = (*it)->decodeCallback( cmdBuff, cmdLen );
- bool processed = (*it)->decodeCallback( cmdBuff, cmdLen );
-
- if( processed )
- {
- break;
+ if( processed )
+ {
+ break;
+ }
}
}
/* Remove the data from the receive buffer - either it was decoded (all well and good)
@@ -431,6 +448,45 @@
return ret_val;
}
+void XBeeDevice::setIgnoreBadChecksum( const bool p_shouldIgnore )
+{
+ m_ignoreBadCsum = p_shouldIgnore;
+}
+
+uint16_t XBeeDevice::getBadChecksumCount( void ) const
+{
+ return m_badCsumCount;
+}
+
+uint16_t XBeeDevice::getSerialBytesDiscardedCount( void ) const
+{
+ return m_serialBytesDiscarded;
+}
+
+bool XBeeDevice::verifyFrameChecksum( const uint8_t* const p_data, size_t p_len )
+{
+ /* TODO: Could try and be "smarter" and build the checksum as the frame is RX'd */
+
+ /* Don't include bytes that aren't checksummed */
+ size_t ctr = p_len - XBEE_API_FRAME_OVERHEAD;
+ /* Skip over the start delimiter and length (not included in checksum) */
+ const uint8_t* dat = p_data + XBEE_API_FRAME_OVERHEAD_START;
+
+ uint8_t sum = 0;
+
+ do
+ {
+ sum += *dat;
+ dat++;
+ ctr--;
+ } while( ctr > 0 );
+
+ sum = 0xFFU - sum;
+
+ return( sum == (*dat));
+}
+
+
#if defined XBEEAPI_CONFIG_USING_RTOS && defined XBEEAPI_CONFIG_RTOS_USE_DISPATCHER
bool XBeeDevice::setupDispatchTask( void )
{