main.cpp

00001 #include "mbed.h"
00002 #include "main.h"
00003 #include "sx1276-hal.h"
00004 #include "debug.h"
00005 
00006 /* Set this flag to '1' to display debug messages on the console */
00007 #define DEBUG_MESSAGE   0
00008 
00009 /* Set this flag to '1' to use the LoRa modulation or to '0' to use FSK modulation */
00010 #define USE_MODEM_LORA  1
00011 #define USE_MODEM_FSK   !USE_MODEM_LORA
00012 
00013 #define RF_FREQUENCY                                    868000000 // Hz
00014 #define TX_OUTPUT_POWER                                 14        // 14 dBm
00015 
00016 #if USE_MODEM_LORA == 1
00017 
00018     #define LORA_BANDWIDTH                              2         // [0: 125 kHz,
00019                                                                   //  1: 250 kHz,
00020                                                                   //  2: 500 kHz,
00021                                                                   //  3: Reserved]
00022     #define LORA_SPREADING_FACTOR                       7         // [SF7..SF12]
00023     #define LORA_CODINGRATE                             1         // [1: 4/5,
00024                                                                   //  2: 4/6,
00025                                                                   //  3: 4/7,
00026                                                                   //  4: 4/8]
00027     #define LORA_PREAMBLE_LENGTH                        8         // Same for Tx and Rx
00028     #define LORA_SYMBOL_TIMEOUT                         5         // Symbols
00029     #define LORA_FIX_LENGTH_PAYLOAD_ON                  false
00030     #define LORA_FHSS_ENABLED                           false  
00031     #define LORA_NB_SYMB_HOP                            4     
00032     #define LORA_IQ_INVERSION_ON                        false
00033     #define LORA_CRC_ENABLED                            true
00034     
00035 #elif USE_MODEM_FSK == 1
00036 
00037     #define FSK_FDEV                                    25000     // Hz
00038     #define FSK_DATARATE                                19200     // bps
00039     #define FSK_BANDWIDTH                               50000     // Hz
00040     #define FSK_AFC_BANDWIDTH                           83333     // Hz
00041     #define FSK_PREAMBLE_LENGTH                         5         // Same for Tx and Rx
00042     #define FSK_FIX_LENGTH_PAYLOAD_ON                   false
00043     #define FSK_CRC_ENABLED                             true
00044     
00045 #else
00046     #error "Please define a modem in the compiler options."
00047 #endif
00048 
00049 #define RX_TIMEOUT_VALUE                                3500000   // in us
00050 #define BUFFER_SIZE                                     32        // Define the payload size here
00051 
00052 #if( defined ( TARGET_KL25Z ) || defined ( TARGET_LPC11U6X ) )
00053 DigitalOut led(LED2);
00054 #else
00055 DigitalOut led(LED1);
00056 #endif
00057 
00058 /*
00059  *  Global variables declarations
00060  */
00061 typedef RadioState States_t;
00062 volatile States_t State = LOWPOWER;
00063 
00064 SX1276MB1xAS Radio( OnTxDone, OnTxTimeout, OnRxDone, OnRxTimeout, OnRxError, NULL, NULL );
00065 
00066 const uint8_t PingMsg[] = "PING";
00067 const uint8_t PongMsg[] = "PONG";
00068 
00069 uint16_t BufferSize = BUFFER_SIZE;
00070 uint8_t Buffer[BUFFER_SIZE];
00071 
00072 int16_t RssiValue = 0.0;
00073 int8_t SnrValue = 0.0;
00074 
00075 int main() 
00076 {
00077     uint8_t i;
00078     bool isMaster = true;
00079     
00080     debug( "\n\n\r     SX1276 Ping Pong Demo Application \n\n\r" );
00081     
00082     // verify the connection with the board
00083     while( Radio.Read( REG_VERSION ) == 0x00  )
00084     {
00085         debug( "Radio could not be detected!\n\r", NULL );
00086         wait( 1 );
00087     }
00088             
00089     debug_if( ( DEBUG_MESSAGE & ( Radio.DetectBoardType( ) == SX1276MB1LAS ) ) , "\n\r > Board Type: SX1276MB1LAS < \n\r" );
00090     debug_if( ( DEBUG_MESSAGE & ( Radio.DetectBoardType( ) == SX1276MB1MAS ) ) , "\n\r > Board Type: SX1276MB1MAS < \n\r" );
00091     
00092     Radio.SetChannel( RF_FREQUENCY ); 
00093 
00094 #if USE_MODEM_LORA == 1
00095     
00096     debug_if( LORA_FHSS_ENABLED, "\n\n\r             > LORA FHSS Mode < \n\n\r");
00097     debug_if( !LORA_FHSS_ENABLED, "\n\n\r             > LORA Mode < \n\n\r");
00098 
00099     Radio.SetTxConfig( MODEM_LORA, TX_OUTPUT_POWER, 0, LORA_BANDWIDTH,
00100                          LORA_SPREADING_FACTOR, LORA_CODINGRATE,
00101                          LORA_PREAMBLE_LENGTH, LORA_FIX_LENGTH_PAYLOAD_ON,
00102                          LORA_CRC_ENABLED, LORA_FHSS_ENABLED, LORA_NB_SYMB_HOP, 
00103                          LORA_IQ_INVERSION_ON, 2000000 );
00104     
00105     Radio.SetRxConfig( MODEM_LORA, LORA_BANDWIDTH, LORA_SPREADING_FACTOR,
00106                          LORA_CODINGRATE, 0, LORA_PREAMBLE_LENGTH,
00107                          LORA_SYMBOL_TIMEOUT, LORA_FIX_LENGTH_PAYLOAD_ON, 0,
00108                          LORA_CRC_ENABLED, LORA_FHSS_ENABLED, LORA_NB_SYMB_HOP, 
00109                          LORA_IQ_INVERSION_ON, true );
00110                          
00111 #elif USE_MODEM_FSK == 1
00112 
00113     debug("\n\n\r              > FSK Mode < \n\n\r");
00114     Radio.SetTxConfig( MODEM_FSK, TX_OUTPUT_POWER, FSK_FDEV, 0,
00115                          FSK_DATARATE, 0,
00116                          FSK_PREAMBLE_LENGTH, FSK_FIX_LENGTH_PAYLOAD_ON,
00117                          FSK_CRC_ENABLED, 0, 0, 0, 2000000 );
00118     
00119     Radio.SetRxConfig( MODEM_FSK, FSK_BANDWIDTH, FSK_DATARATE,
00120                          0, FSK_AFC_BANDWIDTH, FSK_PREAMBLE_LENGTH,
00121                          0, FSK_FIX_LENGTH_PAYLOAD_ON, 0, FSK_CRC_ENABLED,
00122                          0, 0, false, true );
00123                          
00124 #else
00125 
00126 #error "Please define a modem in the compiler options."
00127 
00128 #endif
00129      
00130     debug_if( DEBUG_MESSAGE, "Starting Ping-Pong loop\r\n" ); 
00131         
00132     led = 0;
00133         
00134     Radio.Rx( RX_TIMEOUT_VALUE );
00135     
00136     while( 1 )
00137     {
00138         switch( State )
00139         {
00140         case RX:
00141             if( isMaster == true )
00142             {
00143                 if( BufferSize > 0 )
00144                 {
00145                     if( strncmp( ( const char* )Buffer, ( const char* )PongMsg, 4 ) == 0 )
00146                     {
00147                         led = !led;
00148                         debug( "...Pong\r\n" );
00149                         // Send the next PING frame            
00150                         strcpy( ( char* )Buffer, ( char* )PingMsg );
00151                         // We fill the buffer with numbers for the payload 
00152                         for( i = 4; i < BufferSize; i++ )
00153                         {
00154                             Buffer[i] = i - 4;
00155                         }
00156                         wait_ms( 10 ); 
00157                         Radio.Send( Buffer, BufferSize );
00158                     }
00159                     else if( strncmp( ( const char* )Buffer, ( const char* )PingMsg, 4 ) == 0 )
00160                     { // A master already exists then become a slave
00161                         debug( "...Ping\r\n" );
00162                         led = !led;
00163                         isMaster = false;
00164                         // Send the next PONG frame            
00165                         strcpy( ( char* )Buffer, ( char* )PongMsg );
00166                         // We fill the buffer with numbers for the payload 
00167                         for( i = 4; i < BufferSize; i++ )
00168                         {
00169                             Buffer[i] = i - 4;
00170                         }
00171                         wait_ms( 10 ); 
00172                         Radio.Send( Buffer, BufferSize );
00173                     }
00174                     else // valid reception but neither a PING or a PONG message
00175                     {    // Set device as master ans start again
00176                         isMaster = true;
00177                         Radio.Rx( RX_TIMEOUT_VALUE );
00178                     }    
00179                 }
00180             }
00181             else
00182             {
00183                 if( BufferSize > 0 )
00184                 {
00185                     if( strncmp( ( const char* )Buffer, ( const char* )PingMsg, 4 ) == 0 )
00186                     {
00187                         led = !led;
00188                         debug( "...Ping\r\n" );
00189                         // Send the reply to the PING string
00190                         strcpy( ( char* )Buffer, ( char* )PongMsg );
00191                         // We fill the buffer with numbers for the payload 
00192                         for( i = 4; i < BufferSize; i++ )
00193                         {
00194                             Buffer[i] = i - 4;
00195                         }
00196                         wait_ms( 10 );  
00197                         Radio.Send( Buffer, BufferSize );
00198                     }
00199                     else // valid reception but not a PING as expected
00200                     {    // Set device as master and start again
00201                         isMaster = true;
00202                         Radio.Rx( RX_TIMEOUT_VALUE );
00203                     }    
00204                 }
00205             }
00206             State = LOWPOWER;
00207             break;
00208         case TX:    
00209             led = !led; 
00210             if( isMaster == true )  
00211             {
00212                 debug( "Ping...\r\n" );
00213             }
00214             else
00215             {
00216                 debug( "Pong...\r\n" );
00217             }
00218             Radio.Rx( RX_TIMEOUT_VALUE );
00219             State = LOWPOWER;
00220             break;
00221         case RX_TIMEOUT:
00222             if( isMaster == true )
00223             {
00224                 // Send the next PING frame
00225                 strcpy( ( char* )Buffer, ( char* )PingMsg );
00226                 for( i = 4; i < BufferSize; i++ )
00227                 {
00228                     Buffer[i] = i - 4;
00229                 }
00230                 wait_ms( 10 ); 
00231                 Radio.Send( Buffer, BufferSize );
00232             }
00233             else
00234             {
00235                 Radio.Rx( RX_TIMEOUT_VALUE );  
00236             }             
00237             State = LOWPOWER;
00238             break;
00239         case RX_ERROR:
00240             // We have received a Packet with a CRC error, send reply as if packet was correct
00241             if( isMaster == true )
00242             {
00243                 // Send the next PING frame
00244                 strcpy( ( char* )Buffer, ( char* )PingMsg );
00245                 for( i = 4; i < BufferSize; i++ )
00246                 {
00247                     Buffer[i] = i - 4;
00248                 }
00249                 wait_ms( 10 );  
00250                 Radio.Send( Buffer, BufferSize );
00251             }
00252             else
00253             {
00254                 // Send the next PONG frame
00255                 strcpy( ( char* )Buffer, ( char* )PongMsg );
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             State = LOWPOWER;
00264             break;
00265         case TX_TIMEOUT:
00266             Radio.Rx( RX_TIMEOUT_VALUE );
00267             State = LOWPOWER;
00268             break;
00269         case LOWPOWER:
00270             break;
00271         default:
00272             State = LOWPOWER;
00273             break;
00274         }    
00275     }
00276 }
00277 
00278 void OnTxDone( void )
00279 {
00280     Radio.Sleep( );
00281     State = TX;
00282     debug_if( DEBUG_MESSAGE, "> OnTxDone\n\r" );
00283 }
00284 
00285 void OnRxDone( uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr)
00286 {
00287     Radio.Sleep( );
00288     BufferSize = size;
00289     memcpy( Buffer, payload, BufferSize );
00290     RssiValue = rssi;
00291     SnrValue = snr;
00292     State = RX;
00293     debug_if( DEBUG_MESSAGE, "> OnRxDone\n\r" );
00294 }
00295 
00296 void OnTxTimeout( void )
00297 {
00298     Radio.Sleep( );
00299     State = TX_TIMEOUT;
00300     debug_if( DEBUG_MESSAGE, "> OnTxTimeout\n\r" );
00301 }
00302 
00303 void OnRxTimeout( void )
00304 {
00305     Radio.Sleep( );
00306     Buffer[ BufferSize ] = 0;
00307     State = RX_TIMEOUT;
00308     debug_if( DEBUG_MESSAGE, "> OnRxTimeout\n\r" );
00309 }
00310 
00311 void OnRxError( void )
00312 {
00313     Radio.Sleep( );
00314     State = RX_ERROR;
00315     debug_if( DEBUG_MESSAGE, "> OnRxError\n\r" );
00316 }
00317