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Compute xn297 whitening instead of using an hardcoded array (#1201)

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* Compute xn297 whitening instead of using an hardcoded array

* Add function to scramble byte for XN297 interface

* Refactor XN297 scrambling logic to use a global LFSR and improve byte generation

* Add technical specification and implementation details for XN297 whitening and CRC
This commit is contained in:
goebish
2026-10-25 16:57:07 +01:00
committed by GitHub
parent d3293afdab
commit 91199e146e
4 changed files with 587 additions and 108 deletions
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Multiprotocol/iface_xn297.h
+6
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@@ -20,6 +20,9 @@
#define XN297_250K true
#define XN297_NRF false
#define XN297_CC2500 true
#define XN297_SCRAMBLE_SEED 0xE3B14BE0 // whitening x^7 + x^3 + 1, seed 0x71: first 28 bits
extern uint32_t xn297_lfsr;
//////////////
// Functions
@@ -41,7 +44,10 @@ static void __attribute__((unused)) XN297_RFChannel(uint8_t);
static void __attribute__((unused)) XN297_SetPower();
static void __attribute__((unused)) XN297_SetFreqOffset();
static bool __attribute__((unused)) XN297_IsPacketSent();
static uint8_t __attribute__((unused)) XN297_scramble_byte();
#ifdef XN297DUMP_NRF24L01_INO
static uint16_t __attribute__((unused)) XN297_crc_xorout(bool, uint16_t);
#endif
#endif