Trying to re-create custom Maiana AIS Rx

[handiko]

Hi all,

I'm in the middle of re-creating Maiana as a custom AIS Rx.
My hardware is consisting of STM32L432, Si4463, 30MHz xtal for silabs, EEPROM, without GPS, and without TX amplifier chain.
I'm using firmware from https://github.com/peterantypas/maiana/tree/master/latest/Firmware/Transponder "L432-NewBreakouts".
I've been successfully flash the firmware.
On start-up, the receiver puts out 3 sentences on serial:

$PAISYS,11.x,4.1.0,,STM32L432,1,051
$PAISTN,0,,,0,0,0,0,011
$PAITXCFG,1,0,1,0,0*0A

But nothing else. I have a dummy AIS Tx to test my other AIS receiver, but not been received by the maiana rx. The dummy AIS Tx was always received by my other AIS Rx.
I probed the SCK, MISO, and MOSI lines, and there is activity there on the start-up (after reset). No further activity afterward.
I probed the TRX_IC_DATA, TRX_IC_CLK, RX_IC_DATA, and RX_IC_CLK lines, no activity at all.

Are there some steps I missed?

Thank you all.

Regards,
Handiko

[peterantypas]

My best guess is that firmware is stalling somewhere. Also, I never intended this firmware to be used for a pure receiver, so there's no guarantee that it will work without modifications.

[handiko]

Hi Peter,
Thanks for the answer. I want to investigate further about the Si4463. I believe the si4463 should run on "direct rx" mode, is that correct?
I'm gonna try to re-generate the radio_config.h using WDS. Would you mind helping me evaluate my initial configurations?



Is there anything to set on the FRRA, B, and C?

Best regards,

[peterantypas]

I don't know where my original wds files went, but there is a key option which is to use a non-std preamble and rely on a sync word corresponding to bit sequence 11001100.