drjones a44462e905 Fix two CC1101 SPI protocol bugs found in final datasheet review ...

Bug 1 — FLOOD mode TXFIFO_UNDERFLOW (config.h):
  JAM_FLOOD_PKT_BYTES was 64. RadioLib variable-length mode writes
  one length byte to the FIFO first (dataSent=1), then MIN(len, FIFO_SIZE-1)=63
  data bytes. CC1101 was told to send 64 bytes but only 63 were in the FIFO,
  causing TXFIFO_UNDERFLOW every packet. Changed to 61 bytes (safe margin).

Bug 2 — STATUS register read protocol (main.cpp):
  cc1101ReadRegister sent 0x80|addr for all addresses. Per SWRS061 §10.2,
  for addresses 0x30-0x3D burst-bit=0 selects a command strobe, NOT a
  register read. VERSION register (0x31) was actually triggering an SIDLE
  strobe and returning the status byte. Fixed: use 0xC0|addr (read+burst)
  for addr >= 0x30 to correctly access status registers.

Made-with: Cursor

2026-04-02 13:26:13 -07:00

3.8 KiB

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