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Gazell: why i can only fill 4 pipes

Richard

Hi,

I want to init all 8 pipes in the host device (gazell protocoll) with a single init byte. Thats important because i want to send that init byte to the devices with the first ack-signal.

The problem is that i always got an error after the fourth fill, that looks like that:

Pipe:0   Data:1   Push_ok:1   TX:1   RX:0    Errorcode:0  Enable:FF
Pipe:1   Data:1   Push_ok:1   TX:1   RX:0    Errorcode:0  Enable:FF
Pipe:2   Data:1   Push_ok:1   TX:1   RX:0    Errorcode:0  Enable:FF
Pipe:3   Data:1   Push_ok:1   TX:1   RX:0    Errorcode:0  Enable:FF
Pipe:4   Data:1   Push_ok:0   TX:0   RX:0    Errorcode:8  Enable:FF
Pipe:5   Data:1   Push_ok:0   TX:0   RX:0    Errorcode:8  Enable:FF
Pipe:6   Data:1   Push_ok:0   TX:0   RX:0    Errorcode:8  Enable:FF
Pipe:7   Data:1   Push_ok:0   TX:0   RX:0    Errorcode:8  Enable:FF

When i just init the pipes 4-7 erverything is fine:

Pipe:4   Data:1   Push_ok:1   TX:1   RX:0    Errorcode:0  Enable:FF
Pipe:5   Data:1   Push_ok:1   TX:1   RX:0    Errorcode:0  Enable:FF
Pipe:6   Data:1   Push_ok:1   TX:1   RX:0    Errorcode:0  Enable:FF
Pipe:7   Data:1   Push_ok:1   TX:1   RX:0    Errorcode:0  Enable:FF

All pipes are enabled but after the fourth fill i always got the error 8 which means:

NRF_GZLL_ERROR_CODE_INSUFFICIENT_PACKETS_AVAILABLE      =  8,
///< There are insufficient packets in the Gazell memory pool to 
///< successfully execute the operation.

So i had a look at this: devzone.nordicsemi.com/.../a00140.html and found this section:

When the Host is handling packets on multiple pipes, care needs to be taken to ensure that ACK payloads in the TX FIFOs on pipes that are no longer in use, are not taking up space in the memory pool and consequently blocking communication on other pipes. To avoid such congestion, the application on the Host can flush the TX FIFOs on the pipes no longer in use.

Isn't ist possible to init all 8 pipes with just a single byte (i thougth the TX FiFo has a 3 Bytes memory).

Thank you for your help.

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  • 0

    Hi,

    It seems like you're preloading an ACK payload on your host to all RF pipes. The problem is that the FIFO has a restriction of 3 payloads (3 in TX and 3 in RX), regardless of the length of it.

    So, if you upload 3 payloads in the TX FIFO, the fourth one should fail. I am a bit surprised that you are able to upload a fourth one successfully.

    What you can do in a ACK-payload scenario is that your device sends two payloads

    • First payload is a dummy payload so that the host can prepare it.
    • Second payload is sent to fetch the ACK payload

    Cheers, Håkon

Reply
  • 0

    Hi,

    It seems like you're preloading an ACK payload on your host to all RF pipes. The problem is that the FIFO has a restriction of 3 payloads (3 in TX and 3 in RX), regardless of the length of it.

    So, if you upload 3 payloads in the TX FIFO, the fourth one should fail. I am a bit surprised that you are able to upload a fourth one successfully.

    What you can do in a ACK-payload scenario is that your device sends two payloads

    • First payload is a dummy payload so that the host can prepare it.
    • Second payload is sent to fetch the ACK payload

    Cheers, Håkon

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