SX1261 locks up doing rx or tx - any ideas?

[brianwyld]

Running the SMTC ported to a nrf52832, with a SX1261. It works, but the SX1261 seems to hang randomly when doing a RX or TX operation (BUSY->LOW, no INTR (DIO1) to signal end of radio operation). Could be the first tx after reset, or could be 10 or 20 radio operations later.... Any ideas?

[brianwyld]

bad form to respond to your own question, but it seems like its fixed so this might help someone else:
My hw uses a SX1261 with a TCXO controlled by DIO3 (straight out the reference design) : I correctly returned the config to set this up in ral_sx126x_bsp_get_xosc_cfg(), but had set the "supply voltage" to 3_3V - this causes the random hangups apparently as when I set it to 1_6V as shown below it works much better!

void ral_sx126x_bsp_get_xosc_cfg( const void* context, ral_xosc_cfg_t* xosc_cfg,
                                  sx126x_tcxo_ctrl_voltages_t* supply_voltage, uint32_t* startup_time_in_tick )
{
    // No tcxo on Basic Modem sx1261,sx1262 or sx1268 reference boards
    // On CC2 lora board we have TCXO controlled by DIO3
    *xosc_cfg = RAL_XOSC_CFG_TCXO_RADIO_CTRL;   //RAL_XOSC_CFG_XTAL;
    *supply_voltage = SX126X_TCXO_CTRL_1_6V;        // Probably. DIO3 output
    *startup_time_in_tick = 7;
}