Diff: main.cpp

Revision:

0:5ff027a21ffb

Child:

1:b7fc10b595f3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun May 31 13:08:43 2015 +0000
@@ -0,0 +1,314 @@
+#include "mbed.h"
+
+/*
+    Maintainers: www.netblocks.eu
+    SX1272 LoRa RF module : http://www.netblocks.eu/xrange-sx1272-lora-datasheet/
+*/
+
+#include "main.h"
+#include "sx1272-hal.h"
+#include "debug.h"
+
+/* Set this flag to '1' to display debug messages on the console */
+#define DEBUG_MESSAGE   0
+
+/* Set this flag to '1' to use the LoRa modulation or to '0' to use FSK modulation */
+#define USE_MODEM_LORA  1
+#define USE_MODEM_FSK   !USE_MODEM_LORA
+
+#define RF_FREQUENCY                                    868000000 // Hz
+#define TX_OUTPUT_POWER                                 20        // 14 dBm
+
+#if USE_MODEM_LORA == 1
+
+    #define LORA_BANDWIDTH                              2         // [0: 125 kHz,
+                                                                  //  1: 250 kHz,
+                                                                  //  2: 500 kHz,
+                                                                  //  3: Reserved]
+    #define LORA_SPREADING_FACTOR                       7         // [SF7..SF12]
+    #define LORA_CODINGRATE                             1         // [1: 4/5,
+                                                                  //  2: 4/6,
+                                                                  //  3: 4/7,
+                                                                  //  4: 4/8]
+    #define LORA_PREAMBLE_LENGTH                        8         // Same for Tx and Rx
+    #define LORA_SYMBOL_TIMEOUT                         5         // Symbols
+    #define LORA_FIX_LENGTH_PAYLOAD_ON                  false
+    #define LORA_FHSS_ENABLED                           false  
+    #define LORA_NB_SYMB_HOP                            4     
+    #define LORA_IQ_INVERSION_ON                        false
+    #define LORA_CRC_ENABLED                            true
+    
+#elif USE_MODEM_FSK == 1
+
+    #define FSK_FDEV                                    25000     // Hz
+    #define FSK_DATARATE                                19200     // bps
+    #define FSK_BANDWIDTH                               50000     // Hz
+    #define FSK_AFC_BANDWIDTH                           83333     // Hz
+    #define FSK_PREAMBLE_LENGTH                         5         // Same for Tx and Rx
+    #define FSK_FIX_LENGTH_PAYLOAD_ON                   false
+    #define FSK_CRC_ENABLED                             true
+    
+#else
+    #error "Please define a modem in the compiler options."
+#endif
+
+#define RX_TIMEOUT_VALUE                                3500000   // in us
+#define BUFFER_SIZE                                     32        // Define the payload size here
+
+DigitalOut led(PA_8);
+
+
+/*
+ *  Global variables declarations
+ */
+typedef RadioState States_t;
+volatile States_t State = LOWPOWER;
+
+XRange Radio( OnTxDone, OnTxTimeout, OnRxDone, OnRxTimeout, OnRxError, NULL, NULL );
+
+const uint8_t PingMsg[] = "PING";
+const uint8_t PongMsg[] = "PONG";
+
+uint16_t BufferSize = BUFFER_SIZE;
+uint8_t Buffer[BUFFER_SIZE];
+
+int16_t RssiValue = 0.0;
+int8_t SnrValue = 0.0;
+
+int main() 
+{
+    uint8_t i;
+    bool isMaster = true;
+    
+    debug( "\n\n\r     SX1276 Ping Pong Demo Application \n\n\r" );
+    
+    // verify the connection with the board
+            
+
+    Radio.SetChannel( RF_FREQUENCY ); 
+
+#if USE_MODEM_LORA == 1
+    
+    debug_if( LORA_FHSS_ENABLED, "\n\n\r             > LORA FHSS Mode < \n\n\r");
+    debug_if( !LORA_FHSS_ENABLED, "\n\n\r             > LORA Mode < \n\n\r");
+
+    Radio.SetTxConfig( MODEM_LORA, TX_OUTPUT_POWER, 0, LORA_BANDWIDTH,
+                         LORA_SPREADING_FACTOR, LORA_CODINGRATE,
+                         LORA_PREAMBLE_LENGTH, LORA_FIX_LENGTH_PAYLOAD_ON,
+                         LORA_CRC_ENABLED, LORA_FHSS_ENABLED, LORA_NB_SYMB_HOP, 
+                         LORA_IQ_INVERSION_ON, 2000000 );
+    
+    Radio.SetRxConfig( MODEM_LORA, LORA_BANDWIDTH, LORA_SPREADING_FACTOR,
+                         LORA_CODINGRATE, 0, LORA_PREAMBLE_LENGTH,
+                         LORA_SYMBOL_TIMEOUT, LORA_FIX_LENGTH_PAYLOAD_ON, 0,
+                         LORA_CRC_ENABLED, LORA_FHSS_ENABLED, LORA_NB_SYMB_HOP, 
+                         LORA_IQ_INVERSION_ON, true );
+                         
+#elif USE_MODEM_FSK == 1
+
+    debug("\n\n\r              > FSK Mode < \n\n\r");
+    Radio.SetTxConfig( MODEM_FSK, TX_OUTPUT_POWER, FSK_FDEV, 0,
+                         FSK_DATARATE, 0,
+                         FSK_PREAMBLE_LENGTH, FSK_FIX_LENGTH_PAYLOAD_ON,
+                         FSK_CRC_ENABLED, 0, 0, 0, 2000000 );
+    
+    Radio.SetRxConfig( MODEM_FSK, FSK_BANDWIDTH, FSK_DATARATE,
+                         0, FSK_AFC_BANDWIDTH, FSK_PREAMBLE_LENGTH,
+                         0, FSK_FIX_LENGTH_PAYLOAD_ON, 0, FSK_CRC_ENABLED,
+                         0, 0, false, true );
+                         
+#else
+
+#error "Please define a modem in the compiler options."
+
+#endif
+     
+    debug_if( DEBUG_MESSAGE, "Starting Ping-Pong loop\r\n" ); 
+        
+    led = 0;
+        
+    Radio.Rx( RX_TIMEOUT_VALUE );
+    
+    while( 1 )
+    {
+        switch( State )
+        {
+        case RX:
+            if( isMaster == true )
+            {
+                if( BufferSize > 0 )
+                {
+                    if( strncmp( ( const char* )Buffer, ( const char* )PongMsg, 4 ) == 0 )
+                    {
+                        led = !led;
+                        debug( "...Pong\r\n" );
+                        // Send the next PING frame            
+                        strcpy( ( char* )Buffer, ( char* )PingMsg );
+                        // We fill the buffer with numbers for the payload 
+                        for( i = 4; i < BufferSize; i++ )
+                        {
+                            Buffer[i] = i - 4;
+                        }
+                        wait_ms( 10 ); 
+                        Radio.Send( Buffer, BufferSize );
+                    }
+                    else if( strncmp( ( const char* )Buffer, ( const char* )PingMsg, 4 ) == 0 )
+                    { // A master already exists then become a slave
+                        debug( "...Ping\r\n" );
+                        led = !led;
+                        isMaster = false;
+                        // Send the next PONG frame            
+                        strcpy( ( char* )Buffer, ( char* )PongMsg );
+                        // We fill the buffer with numbers for the payload 
+                        for( i = 4; i < BufferSize; i++ )
+                        {
+                            Buffer[i] = i - 4;
+                        }
+                        wait_ms( 10 ); 
+                        Radio.Send( Buffer, BufferSize );
+                    }
+                    else // valid reception but neither a PING or a PONG message
+                    {    // Set device as master ans start again
+                        isMaster = true;
+                        Radio.Rx( RX_TIMEOUT_VALUE );
+                    }    
+                }
+            }
+            else
+            {
+                if( BufferSize > 0 )
+                {
+                    if( strncmp( ( const char* )Buffer, ( const char* )PingMsg, 4 ) == 0 )
+                    {
+                        led = !led;
+                        debug( "...Ping\r\n" );
+                        // Send the reply to the PING string
+                        strcpy( ( char* )Buffer, ( char* )PongMsg );
+                        // We fill the buffer with numbers for the payload 
+                        for( i = 4; i < BufferSize; i++ )
+                        {
+                            Buffer[i] = i - 4;
+                        }
+                        wait_ms( 10 );  
+                        Radio.Send( Buffer, BufferSize );
+                    }
+                    else // valid reception but not a PING as expected
+                    {    // Set device as master and start again
+                        isMaster = true;
+                        Radio.Rx( RX_TIMEOUT_VALUE );
+                    }    
+                }
+            }
+            State = LOWPOWER;
+            break;
+        case TX:    
+            led = !led; 
+            if( isMaster == true )  
+            {
+                debug( "Ping...\r\n" );
+            }
+            else
+            {
+                debug( "Pong...\r\n" );
+            }
+            Radio.Rx( RX_TIMEOUT_VALUE );
+            State = LOWPOWER;
+            break;
+        case RX_TIMEOUT:
+            if( isMaster == true )
+            {
+                // Send the next PING frame
+                strcpy( ( char* )Buffer, ( char* )PingMsg );
+                for( i = 4; i < BufferSize; i++ )
+                {
+                    Buffer[i] = i - 4;
+                }
+                wait_ms( 10 ); 
+                Radio.Send( Buffer, BufferSize );
+            }
+            else
+            {
+                Radio.Rx( RX_TIMEOUT_VALUE );  
+            }             
+            State = LOWPOWER;
+            break;
+        case RX_ERROR:
+            // We have received a Packet with a CRC error, send reply as if packet was correct
+            if( isMaster == true )
+            {
+                // Send the next PING frame
+                strcpy( ( char* )Buffer, ( char* )PingMsg );
+                for( i = 4; i < BufferSize; i++ )
+                {
+                    Buffer[i] = i - 4;
+                }
+                wait_ms( 10 );  
+                Radio.Send( Buffer, BufferSize );
+            }
+            else
+            {
+                // Send the next PONG frame
+                strcpy( ( char* )Buffer, ( char* )PongMsg );
+                for( i = 4; i < BufferSize; i++ )
+                {
+                    Buffer[i] = i - 4;
+                }
+                wait_ms( 10 );  
+                Radio.Send( Buffer, BufferSize );
+            }
+            State = LOWPOWER;
+            break;
+        case TX_TIMEOUT:
+            Radio.Rx( RX_TIMEOUT_VALUE );
+            State = LOWPOWER;
+            break;
+        case LOWPOWER:
+            break;
+        default:
+            State = LOWPOWER;
+            break;
+        }    
+    }
+}
+
+void OnTxDone( void )
+{
+    Radio.Sleep( );
+    State = TX;
+    debug_if( DEBUG_MESSAGE, "> OnTxDone\n\r" );
+}
+
+void OnRxDone( uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr)
+{
+    Radio.Sleep( );
+    BufferSize = size;
+    memcpy( Buffer, payload, BufferSize );
+    RssiValue = rssi;
+    SnrValue = snr;
+    State = RX;
+    debug_if( DEBUG_MESSAGE, "> OnRxDone\n\r" );
+}
+
+void OnTxTimeout( void )
+{
+    Radio.Sleep( );
+    State = TX_TIMEOUT;
+    debug_if( DEBUG_MESSAGE, "> OnTxTimeout\n\r" );
+}
+
+void OnRxTimeout( void )
+{
+    Radio.Sleep( );
+    Buffer[ BufferSize ] = 0;
+    State = RX_TIMEOUT;
+    debug_if( DEBUG_MESSAGE, "> OnRxTimeout\n\r" );
+    debug_if( DEBUG_MESSAGE, "> OnRxTimeout\n\r" );
+    
+}
+
+void OnRxError( void )
+{
+    Radio.Sleep( );
+    State = RX_ERROR;
+    debug_if( DEBUG_MESSAGE, "> OnRxError\n\r" );
+}