Driver library for SX1272/SX1276 transceivers

Dependents:   LORA_RX LORA_TX WindConcentrator hid_test ... more

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Driver library for SX1272 and SX1276 radio transceivers.

This device uses CSS modulation to provide much improved link budget. The RF hardware is same as in FSK devices, just with added LoRa spread-spectrum modem.

This library provides functions to configure radio chip and transmit & receive packets.

Using This Library

Library function service_radio() must be called continuously from main loop, to service interrupts from radio.

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Board Specific implementation

FunctionPointer for rf_switch callback allows the program to implement control of RF switch unique to their board. Example options are:

  • SKY13373 for external power amplifier implementation. Requires two DigitalOut pins.
  • SKY13350 using PA_BOOST. requires two DigitalOut pins.
  • PE4259-63: controlled directly by radio chip, no software function needed. However, in the case of SX1276MB1xAS, the RXTX pin on IO2 should be driven by this callback function when R16 is installed (without R15) on this shield board.

Some configurations may need to force the use of RFO or PA_BOOST, or a board could offer both options. The rf_switch function pointer callback should support the implementation choice on the board.

further reading

Revision:
26:4876e515ff4c
Parent:
12:bda42457c34a
Child:
27:da6341d9d5b1
diff -r fa867fb9d2f6 -r 4876e515ff4c sx127x_fsk.h
--- a/sx127x_fsk.h	Thu Oct 22 01:27:18 2015 +0000
+++ b/sx127x_fsk.h	Mon Jul 18 21:13:50 2016 +0000
@@ -313,9 +313,12 @@
         RegTimerResol_t      RegTimerResol;       // 0x38
         RegImageCal_t        RegImageCal;         // 0x3b
         
+        bool tx_done_sleep; // false:go to standby after tx done, true:sleep
+        
         SX127x& m_xcvr;
         
     private:
+        unsigned int bit_period_us;
         uint32_t ComputeRxBw( uint8_t mantisse, uint8_t exponent );
         void ComputeRxBwMantExp( uint32_t rxBwValue, uint8_t* mantisse, uint8_t* exponent );