main.cpp

00001 #include "mbed.h"
00002 #include "main.h"
00003 #include "sx1276-hal.h"
00004 
00005 /* Set this flag to '1' to display debug messages on the console */
00006 #define DEBUG_MESSAGE   1
00007 
00008 /* Set this flag to '1' to use the LoRa modulation or to '0' to use FSK modulation */
00009 #define USE_MODEM_LORA  1
00010 #define USE_MODEM_FSK   !USE_MODEM_LORA
00011 
00012 #define RF_FREQUENCY                                    868000000 // Hz
00013 #define TX_OUTPUT_POWER                                 14        // 14 dBm
00014 
00015 #if USE_MODEM_LORA == 1
00016 
00017     #define LORA_BANDWIDTH                              2         // [0: 125 kHz,
00018                                                                   //  1: 250 kHz,
00019                                                                   //  2: 500 kHz,
00020                                                                   //  3: Reserved]
00021     #define LORA_SPREADING_FACTOR                       7         // [SF7..SF12]
00022     #define LORA_CODINGRATE                             1         // [1: 4/5,
00023                                                                   //  2: 4/6,
00024                                                                   //  3: 4/7,
00025                                                                   //  4: 4/8]
00026     #define LORA_PREAMBLE_LENGTH                        8         // Same for Tx and Rx
00027     #define LORA_SYMBOL_TIMEOUT                         5         // Symbols
00028     #define LORA_FIX_LENGTH_PAYLOAD_ON                  false
00029     #define LORA_FHSS_ENABLED                           false  
00030     #define LORA_NB_SYMB_HOP                            4     
00031     #define LORA_IQ_INVERSION_ON                        false
00032     #define LORA_CRC_ENABLED                            true
00033 
00034 #elif USE_MODEM_FSK == 1
00035 
00036     #define FSK_FDEV                                    25000     // Hz
00037     #define FSK_DATARATE                                19200     // bps
00038     #define FSK_BANDWIDTH                               50000     // Hz
00039     #define FSK_AFC_BANDWIDTH                           83333     // Hz
00040     #define FSK_PREAMBLE_LENGTH                         5         // Same for Tx and Rx
00041     #define FSK_FIX_LENGTH_PAYLOAD_ON                   false
00042     #define FSK_CRC_ENABLED                             true
00043 
00044 #else
00045     #error "Please define a modem in the compiler options."
00046 #endif
00047 
00048 #define RX_TIMEOUT_VALUE                                3500      // in ms
00049 #define BUFFER_SIZE                                     32        // Define the payload size here
00050 
00051 #if( defined ( TARGET_KL25Z ) || defined ( TARGET_LPC11U6X ) )
00052 DigitalOut led( LED2 );
00053 #else
00054 DigitalOut led( LED1 );
00055 #endif
00056 
00057 /*
00058  *  Global variables declarations
00059  */
00060 typedef enum
00061 {
00062     LOWPOWER = 0,
00063     IDLE,
00064 
00065     RX,
00066     RX_TIMEOUT,
00067     RX_ERROR,
00068 
00069     TX,
00070     TX_TIMEOUT,
00071 
00072     CAD,
00073     CAD_DONE
00074 }AppStates_t;
00075 
00076 volatile AppStates_t State = LOWPOWER;
00077 
00078 /*!
00079  * Radio events function pointer
00080  */
00081 static RadioEvents_t RadioEvents;
00082 
00083 /*
00084  *  Global variables declarations
00085  */
00086 SX1276MB1xAS Radio( NULL );
00087 
00088 const uint8_t PingMsg[] = "PING";
00089 const uint8_t PongMsg[] = "PONG";
00090 
00091 uint16_t BufferSize = BUFFER_SIZE;
00092 uint8_t Buffer[BUFFER_SIZE];
00093 
00094 int16_t RssiValue = 0.0;
00095 int8_t SnrValue = 0.0;
00096 
00097 int main( void ) 
00098 {
00099     uint8_t i;
00100     bool isMaster = true;
00101 
00102     debug( "\n\n\r     SX1276 Ping Pong Demo Application \n\n\r" );
00103 
00104     // Initialize Radio driver
00105     RadioEvents.TxDone = OnTxDone;
00106     RadioEvents.RxDone = OnRxDone;
00107     RadioEvents.RxError = OnRxError;
00108     RadioEvents.TxTimeout = OnTxTimeout;
00109     RadioEvents.RxTimeout = OnRxTimeout;
00110     Radio.Init( &RadioEvents );
00111 
00112     // verify the connection with the board
00113     while( Radio.Read( REG_VERSION ) == 0x00  )
00114     {
00115         debug( "Radio could not be detected!\n\r", NULL );
00116         wait( 1 );
00117     }
00118 
00119     debug_if( ( DEBUG_MESSAGE & ( Radio.DetectBoardType( ) == SX1276MB1LAS ) ), "\n\r > Board Type: SX1276MB1LAS < \n\r" );
00120     debug_if( ( DEBUG_MESSAGE & ( Radio.DetectBoardType( ) == SX1276MB1MAS ) ), "\n\r > Board Type: SX1276MB1MAS < \n\r" );
00121 
00122     Radio.SetChannel( RF_FREQUENCY ); 
00123 
00124 #if USE_MODEM_LORA == 1
00125 
00126     debug_if( LORA_FHSS_ENABLED, "\n\n\r             > LORA FHSS Mode < \n\n\r" );
00127     debug_if( !LORA_FHSS_ENABLED, "\n\n\r             > LORA Mode < \n\n\r" );
00128 
00129     Radio.SetTxConfig( MODEM_LORA, TX_OUTPUT_POWER, 0, LORA_BANDWIDTH,
00130                          LORA_SPREADING_FACTOR, LORA_CODINGRATE,
00131                          LORA_PREAMBLE_LENGTH, LORA_FIX_LENGTH_PAYLOAD_ON,
00132                          LORA_CRC_ENABLED, LORA_FHSS_ENABLED, LORA_NB_SYMB_HOP,
00133                          LORA_IQ_INVERSION_ON, 2000 );
00134 
00135     Radio.SetRxConfig( MODEM_LORA, LORA_BANDWIDTH, LORA_SPREADING_FACTOR,
00136                          LORA_CODINGRATE, 0, LORA_PREAMBLE_LENGTH,
00137                          LORA_SYMBOL_TIMEOUT, LORA_FIX_LENGTH_PAYLOAD_ON, 0,
00138                          LORA_CRC_ENABLED, LORA_FHSS_ENABLED, LORA_NB_SYMB_HOP,
00139                          LORA_IQ_INVERSION_ON, true );
00140 
00141 #elif USE_MODEM_FSK == 1
00142 
00143     debug("\n\n\r              > FSK Mode < \n\n\r" );
00144     Radio.SetTxConfig( MODEM_FSK, TX_OUTPUT_POWER, FSK_FDEV, 0,
00145                          FSK_DATARATE, 0,
00146                          FSK_PREAMBLE_LENGTH, FSK_FIX_LENGTH_PAYLOAD_ON,
00147                          FSK_CRC_ENABLED, 0, 0, 0, 2000 );
00148 
00149     Radio.SetRxConfig( MODEM_FSK, FSK_BANDWIDTH, FSK_DATARATE,
00150                          0, FSK_AFC_BANDWIDTH, FSK_PREAMBLE_LENGTH,
00151                          0, FSK_FIX_LENGTH_PAYLOAD_ON, 0, FSK_CRC_ENABLED,
00152                          0, 0, false, true );
00153 
00154 #else
00155 
00156 #error "Please define a modem in the compiler options."
00157 
00158 #endif
00159 
00160     debug_if( DEBUG_MESSAGE, "Starting Ping-Pong loop\r\n" );
00161 
00162     led = 0;
00163 
00164     Radio.Rx( RX_TIMEOUT_VALUE );
00165 
00166     while( 1 )
00167     {
00168         switch( State )
00169         {
00170         case RX:
00171             if( isMaster == true )
00172             {
00173                 if( BufferSize > 0 )
00174                 {
00175                     if( strncmp( ( const char* )Buffer, ( const char* )PongMsg, 4 ) == 0 )
00176                     {
00177                         led = !led;
00178                         debug( "...Pong\r\n" );
00179                         // Send the next PING frame
00180                         strcpy( ( char* )Buffer, ( char* )PingMsg );
00181                         // We fill the buffer with numbers for the payload
00182                         for( i = 4; i < BufferSize; i++ )
00183                         {
00184                             Buffer[i] = i - 4;
00185                         }
00186                         wait_ms( 10 );
00187                         Radio.Send( Buffer, BufferSize );
00188                     }
00189                     else if( strncmp( ( const char* )Buffer, ( const char* )PingMsg, 4 ) == 0 )
00190                     { // A master already exists then become a slave
00191                         debug( "...Ping\r\n" );
00192                         led = !led;
00193                         isMaster = false;
00194                         // Send the next PONG frame
00195                         strcpy( ( char* )Buffer, ( char* )PongMsg );
00196                         // We fill the buffer with numbers for the payload
00197                         for( i = 4; i < BufferSize; i++ )
00198                         {
00199                             Buffer[i] = i - 4;
00200                         }
00201                         wait_ms( 10 );
00202                         Radio.Send( Buffer, BufferSize );
00203                     }
00204                     else // valid reception but neither a PING or a PONG message
00205                     {    // Set device as master ans start again
00206                         isMaster = true;
00207                         Radio.Rx( RX_TIMEOUT_VALUE );
00208                     }
00209                 }
00210             }
00211             else
00212             {
00213                 if( BufferSize > 0 )
00214                 {
00215                     if( strncmp( ( const char* )Buffer, ( const char* )PingMsg, 4 ) == 0 )
00216                     {
00217                         led = !led;
00218                         debug( "...Ping\r\n" );
00219                         // Send the reply to the PING string
00220                         strcpy( ( char* )Buffer, ( char* )PongMsg );
00221                         // We fill the buffer with numbers for the payload
00222                         for( i = 4; i < BufferSize; i++ )
00223                         {
00224                             Buffer[i] = i - 4;
00225                         }
00226                         wait_ms( 10 );
00227                         Radio.Send( Buffer, BufferSize );
00228                     }
00229                     else // valid reception but not a PING as expected
00230                     {    // Set device as master and start again
00231                         isMaster = true;
00232                         Radio.Rx( RX_TIMEOUT_VALUE );
00233                     }
00234                 }
00235             }
00236             State = LOWPOWER;
00237             break;
00238         case TX:
00239             led = !led;
00240             if( isMaster == true )  
00241             {
00242                 debug( "Ping...\r\n" );
00243             }
00244             else
00245             {
00246                 debug( "Pong...\r\n" );
00247             }
00248             Radio.Rx( RX_TIMEOUT_VALUE );
00249             State = LOWPOWER;
00250             break;
00251         case RX_TIMEOUT:
00252             if( isMaster == true )
00253             {
00254                 // Send the next PING frame
00255                 strcpy( ( char* )Buffer, ( char* )PingMsg );
00256                 for( i = 4; i < BufferSize; i++ )
00257                 {
00258                     Buffer[i] = i - 4;
00259                 }
00260                 wait_ms( 10 );
00261                 Radio.Send( Buffer, BufferSize );
00262             }
00263             else
00264             {
00265                 Radio.Rx( RX_TIMEOUT_VALUE );
00266             }
00267             State = LOWPOWER;
00268             break;
00269         case RX_ERROR:
00270             // We have received a Packet with a CRC error, send reply as if packet was correct
00271             if( isMaster == true )
00272             {
00273                 // Send the next PING frame
00274                 strcpy( ( char* )Buffer, ( char* )PingMsg );
00275                 for( i = 4; i < BufferSize; i++ )
00276                 {
00277                     Buffer[i] = i - 4;
00278                 }
00279                 wait_ms( 10 );
00280                 Radio.Send( Buffer, BufferSize );
00281             }
00282             else
00283             {
00284                 // Send the next PONG frame
00285                 strcpy( ( char* )Buffer, ( char* )PongMsg );
00286                 for( i = 4; i < BufferSize; i++ )
00287                 {
00288                     Buffer[i] = i - 4;
00289                 }
00290                 wait_ms( 10 );
00291                 Radio.Send( Buffer, BufferSize );
00292             }
00293             State = LOWPOWER;
00294             break;
00295         case TX_TIMEOUT:
00296             Radio.Rx( RX_TIMEOUT_VALUE );
00297             State = LOWPOWER;
00298             break;
00299         case LOWPOWER:
00300             break;
00301         default:
00302             State = LOWPOWER;
00303             break;
00304         }
00305     }
00306 }
00307 
00308 void OnTxDone( void )
00309 {
00310     Radio.Sleep( );
00311     State = TX;
00312     debug_if( DEBUG_MESSAGE, "> OnTxDone\n\r" );
00313 }
00314 
00315 void OnRxDone( uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr )
00316 {
00317     Radio.Sleep( );
00318     BufferSize = size;
00319     memcpy( Buffer, payload, BufferSize );
00320     RssiValue = rssi;
00321     SnrValue = snr;
00322     State = RX;
00323     debug_if( DEBUG_MESSAGE, "> OnRxDone\n\r" );
00324 }
00325 
00326 void OnTxTimeout( void )
00327 {
00328     Radio.Sleep( );
00329     State = TX_TIMEOUT;
00330     debug_if( DEBUG_MESSAGE, "> OnTxTimeout\n\r" );
00331 }
00332 
00333 void OnRxTimeout( void )
00334 {
00335     Radio.Sleep( );
00336     Buffer[BufferSize] = 0;
00337     State = RX_TIMEOUT;
00338     debug_if( DEBUG_MESSAGE, "> OnRxTimeout\n\r" );
00339 }
00340 
00341 void OnRxError( void )
00342 {
00343     Radio.Sleep( );
00344     State = RX_ERROR;
00345     debug_if( DEBUG_MESSAGE, "> OnRxError\n\r" );
00346 }