CC1101: FIFO Overflows in Infinite Packet Mode

Charles Honeycutt

Part Number: CC1101

Hello All,

I am working on a cc1101 packet structure that needs to be very custom (to fit an existing packet structure) and thus cannot have the length byte in front of the payload.

I thought the way to get around this is to use 'infinite packet length' mode - that way the length byte is not automatically added

My question is then that when I do this, everytime my CC1101 receives a packet, it's FIFO overflows (I set back to idle after reading the expected number of bytes, flush the fifo)

Is this to be expected in infinite packet length mode?

Basically my issue again is that I need variable length packets, but need the length byte inside the payload due to fitting an existing packet structure

Thanks!

over 3 years ago

+1 TER over 3 years ago

TI__Guru**** 317180 points

Have you implemented infinite packet mode according to https://www.ti.com/lit/pdf/swra109 ?

I agree that this is a method you can use. Then you can abort RX when you have received the amount of bytes indicated by the packet length placed as byte x in the packet.

+1 Charles Honeycutt over 3 years ago in reply to TER

Prodigy 50 points

I will look at SWRA109 - thank you (i was not aware of this)

For the second part that's what I was trying:
1. go into RX mode
2. Read number of bytes (in my case testing with 3)
3. Then send strobe command to go into IDLE mode

Is going into IDLE the correct way to abort RX?

I was using GDO0 Config 0x06 (assert as packet begin; de-assert at packet end) and can see the GDO assert for longer that the sender GDO line

0 Charles Honeycutt over 3 years ago

Prodigy 50 points

I see now that using the while waits for both edges of GDO seems to fix my overflow issue - thanks TER

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CC1101: FIFO Overflows in Infinite Packet Mode