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                                    915000000 // Hz
00014 #define TX_OUTPUT_POWER                                 14        // 14 dBm
00015 
00016 #if USE_MODEM_LORA == 1
00017 
00018     #define LORA_BANDWIDTH                              1         // [0: 125 kHz,
00019                                                                   //  1: 250 kHz,
00020                                                                   //  2: 500 kHz,
00021                                                                   //  3: Reserved]
00022     #define LORA_SPREADING_FACTOR                       10         // [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                           true  
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 [min:1 max:255]
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 /*
00065  *  Global variables declarations
00066  */
00067 SX1276MB1xAS Radio( OnTxDone, OnTxTimeout, OnRxDone, OnRxTimeout, OnRxError, OnFhssChangeChannel, NULL );
00068 
00069 const uint8_t PingMsg[] = "PING";
00070 const uint8_t PongMsg[] = "PONG";
00071 
00072 uint16_t BufferSize = BUFFER_SIZE;
00073 uint8_t Buffer[BUFFER_SIZE];
00074 
00075 int16_t RssiValue = 0.0;
00076 int8_t SnrValue = 0.0;
00077 
00078 int main() 
00079 {
00080     uint8_t i;
00081     bool isMaster = true;
00082     
00083     debug( "\n\n\r     SX1276 Ping Pong Demo Application \n\n\r" );
00084     
00085     // verify the connection with the board
00086     while( Radio.Read( REG_VERSION ) == 0x00  )
00087     {
00088         debug( "Radio could not be detected!\n\r", NULL );
00089         wait( 1 );
00090     }
00091             
00092     debug_if( ( DEBUG_MESSAGE & ( Radio.DetectBoardType( ) == SX1276MB1LAS ) ) , "\n\r > Board Type: SX1276MB1LAS < \n\r" );
00093     debug_if( ( DEBUG_MESSAGE & ( Radio.DetectBoardType( ) == SX1276MB1MAS ) ) , "\n\r > Board Type: SX1276MB1MAS < \n\r" );
00094     
00095     Radio.SetChannel( HoppingFrequencies[0] ); 
00096 
00097 #if USE_MODEM_LORA == 1
00098     
00099     debug_if( LORA_FHSS_ENABLED, "\n\n\r             > LORA FHSS Mode < \n\n\r");
00100     debug_if( !LORA_FHSS_ENABLED, "\n\n\r             > LORA Mode < \n\n\r");
00101 
00102     Radio.SetTxConfig( MODEM_LORA, TX_OUTPUT_POWER, 0, LORA_BANDWIDTH,
00103                          LORA_SPREADING_FACTOR, LORA_CODINGRATE,
00104                          LORA_PREAMBLE_LENGTH, LORA_FIX_LENGTH_PAYLOAD_ON,
00105                          LORA_CRC_ENABLED, LORA_FHSS_ENABLED, LORA_NB_SYMB_HOP, 
00106                          LORA_IQ_INVERSION_ON, 4000000 );
00107     
00108     Radio.SetRxConfig( MODEM_LORA, LORA_BANDWIDTH, LORA_SPREADING_FACTOR,
00109                          LORA_CODINGRATE, 0, LORA_PREAMBLE_LENGTH,
00110                          LORA_SYMBOL_TIMEOUT, LORA_FIX_LENGTH_PAYLOAD_ON, 0,
00111                          LORA_CRC_ENABLED, LORA_FHSS_ENABLED, LORA_NB_SYMB_HOP, 
00112                          LORA_IQ_INVERSION_ON, true );
00113                          
00114 #elif USE_MODEM_FSK == 1
00115 
00116     debug("\n\n\r              > FSK Mode < \n\n\r");
00117     Radio.SetTxConfig( MODEM_FSK, TX_OUTPUT_POWER, FSK_FDEV, 0,
00118                          FSK_DATARATE, 0,
00119                          FSK_PREAMBLE_LENGTH, FSK_FIX_LENGTH_PAYLOAD_ON,
00120                          FSK_CRC_ENABLED, 0, 0, 0, 3000000 );
00121     
00122     Radio.SetRxConfig( MODEM_FSK, FSK_BANDWIDTH, FSK_DATARATE,
00123                          0, FSK_AFC_BANDWIDTH, FSK_PREAMBLE_LENGTH,
00124                          0, FSK_FIX_LENGTH_PAYLOAD_ON, 0, FSK_CRC_ENABLED,
00125                          0, 0, false, true );
00126                          
00127 #else
00128 
00129 #error "Please define a modem in the compiler options."
00130 
00131 #endif
00132      
00133     debug_if( DEBUG_MESSAGE, "Starting Ping-Pong loop\r\n" ); 
00134         
00135     led = 0;
00136         
00137     Radio.Rx( RX_TIMEOUT_VALUE );
00138     
00139     while( 1 )
00140     {
00141         switch( State )
00142         {
00143         case RX:
00144             if( isMaster == true )
00145             {
00146                 if( BufferSize > 0 )
00147                 {
00148                     if( strncmp( ( const char* )Buffer, ( const char* )PongMsg, 4 ) == 0 )
00149                     {
00150                         led = !led;
00151                         debug( "...Pong\r\n" );
00152                         // Send the next PING frame            
00153                         strcpy( ( char* )Buffer, ( char* )PingMsg );
00154                         // We fill the buffer with numbers for the payload 
00155                         for( i = 4; i < BufferSize; i++ )
00156                         {
00157                             Buffer[i] = i - 4;
00158                         }
00159                         wait_ms( 10 ); 
00160                         Radio.Send( Buffer, BufferSize );
00161                     }
00162                     else if( strncmp( ( const char* )Buffer, ( const char* )PingMsg, 4 ) == 0 )
00163                     { // A master already exists then become a slave
00164                         debug( "...Ping\r\n" );
00165                         led = !led;
00166                         isMaster = false;
00167                         // Send the next PONG frame            
00168                         strcpy( ( char* )Buffer, ( char* )PongMsg );
00169                         // We fill the buffer with numbers for the payload 
00170                         for( i = 4; i < BufferSize; i++ )
00171                         {
00172                             Buffer[i] = i - 4;
00173                         }
00174                         wait_ms( 10 ); 
00175                         Radio.Send( Buffer, BufferSize );
00176                     }
00177                     else // valid reception but neither a PING or a PONG message
00178                     {    // Set device as master ans start again
00179                         isMaster = true;
00180                         Radio.Rx( RX_TIMEOUT_VALUE );
00181                     }    
00182                 }
00183             }
00184             else
00185             {
00186                 if( BufferSize > 0 )
00187                 {
00188                     if( strncmp( ( const char* )Buffer, ( const char* )PingMsg, 4 ) == 0 )
00189                     {
00190                         led = !led;
00191                         debug( "...Ping\r\n" );
00192                         // Send the reply to the PING string
00193                         strcpy( ( char* )Buffer, ( char* )PongMsg );
00194                         // We fill the buffer with numbers for the payload 
00195                         for( i = 4; i < BufferSize; i++ )
00196                         {
00197                             Buffer[i] = i - 4;
00198                         }
00199                         wait_ms( 10 );  
00200                         Radio.Send( Buffer, BufferSize );
00201                     }
00202                     else // valid reception but not a PING as expected
00203                     {    // Set device as master and start again
00204                         isMaster = true;
00205                         Radio.Rx( RX_TIMEOUT_VALUE );
00206                     }    
00207                 }
00208             }
00209             State = LOWPOWER;
00210             break;
00211         case TX:    
00212             led = !led; 
00213             if( isMaster == true )  
00214             {
00215                 debug( "Ping...\r\n" );
00216             }
00217             else
00218             {
00219                 debug( "Pong...\r\n" );
00220             }
00221             Radio.Rx( RX_TIMEOUT_VALUE );
00222             State = LOWPOWER;
00223             break;
00224         case RX_TIMEOUT:
00225             if( isMaster == true )
00226             {
00227                 // Send the next PING frame
00228                 strcpy( ( char* )Buffer, ( char* )PingMsg );
00229                 for( i = 4; i < BufferSize; i++ )
00230                 {
00231                     Buffer[i] = i - 4;
00232                 }
00233                 wait_ms( 10 ); 
00234                 Radio.Send( Buffer, BufferSize );
00235             }
00236             else
00237             {
00238                 Radio.Rx( RX_TIMEOUT_VALUE );  
00239             }             
00240             State = LOWPOWER;
00241             break;
00242         case RX_ERROR:
00243             // We have received a Packet with a CRC error, send reply as if packet was correct
00244             if( isMaster == true )
00245             {
00246                 // Send the next PING frame
00247                 strcpy( ( char* )Buffer, ( char* )PingMsg );
00248                 for( i = 4; i < BufferSize; i++ )
00249                 {
00250                     Buffer[i] = i - 4;
00251                 }
00252                 wait_ms( 10 );  
00253                 Radio.Send( Buffer, BufferSize );
00254             }
00255             else
00256             {
00257                 // Send the next PONG frame
00258                 strcpy( ( char* )Buffer, ( char* )PongMsg );
00259                 for( i = 4; i < BufferSize; i++ )
00260                 {
00261                     Buffer[i] = i - 4;
00262                 }
00263                 wait_ms( 10 );  
00264                 Radio.Send( Buffer, BufferSize );
00265             }
00266             State = LOWPOWER;
00267             break;
00268         case TX_TIMEOUT:
00269             Radio.Rx( RX_TIMEOUT_VALUE );
00270             State = LOWPOWER;
00271             break;
00272         case LOWPOWER:
00273             break;
00274         default:
00275             State = LOWPOWER;
00276             break;
00277         }    
00278     }
00279 }
00280 
00281 void OnTxDone( void )
00282 {
00283     Radio.SetChannel( HoppingFrequencies[0] );
00284     Radio.Sleep( );
00285     State = TX;
00286     debug_if( DEBUG_MESSAGE, "> OnTxDone\n\r" );
00287 }
00288 
00289 void OnRxDone( uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr)
00290 {
00291     Radio.SetChannel( HoppingFrequencies[0] );
00292     Radio.Sleep( );
00293     BufferSize = size;
00294     memcpy( Buffer, payload, BufferSize );
00295     RssiValue = rssi;
00296     SnrValue = snr;
00297     State = RX;
00298     debug_if( DEBUG_MESSAGE, "> OnRxDone\n\r" );
00299 }
00300 
00301 void OnTxTimeout( void )
00302 {
00303     Radio.SetChannel( HoppingFrequencies[0] );
00304     Radio.Sleep( );
00305     State = TX_TIMEOUT;
00306     debug_if( DEBUG_MESSAGE, "> OnTxTimeout\n\r" );
00307 }
00308 
00309 void OnRxTimeout( void )
00310 {
00311     Radio.SetChannel( HoppingFrequencies[0] );
00312     Radio.Sleep( );
00313     Buffer[ BufferSize ] = 0;
00314     State = RX_TIMEOUT;
00315     debug_if( DEBUG_MESSAGE, "> OnRxTimeout\n\r" );
00316 }
00317 
00318 void OnRxError( void )
00319 {
00320     Radio.SetChannel( HoppingFrequencies[0] );
00321     Radio.Sleep( );
00322     State = RX_ERROR;
00323     debug_if( DEBUG_MESSAGE, "> OnRxError\n\r" );
00324 }
00325 
00326 void OnFhssChangeChannel( uint8_t channelIndex )
00327 {
00328     Radio.SetChannel( HoppingFrequencies[channelIndex] );
00329     debug_if( DEBUG_MESSAGE, "F%d-", channelIndex);
00330 }