Burst transmission triggered many times

RE: Burst transmission triggered many times

Sven — Tue, 12 Apr 2016 15:51:16 GMT

Year late, but this approach works okay until the burst sequence does not get very long (in my case got 30 times 8byte packets)....

RE: Burst transmission triggered many times

testy — Tue, 07 Apr 2015 04:25:24 GMT

It is worth registering at thisisant.com.

thisisant SDK shows, when flag is needed (antfs.c x message_types_main.c).

RE: Burst transmission triggered many times

Vito — Mon, 06 Apr 2015 09:01:43 GMT

Hi, thanks a lot. I have googled for uses of sd_ant_burst_handler_request() but the two links you posted are in a restricted area, so they weren't showing up. For completeness, this is what made my burst transmission work:

do
{
    err_code = sd_ant_burst_handler_request(CHANNEL_0, TX_PACKET_LEN, ant_msg, (BURST_SEGMENT_START|BURST_SEGMENT_END) );                
} 
while (err_code == NRF_ANT_ERROR_TRANSFER_IN_PROGRESS);
APP_ERROR_CHECK(err_code);

I notice that the registering of the wait flag became useless and I can remove it, am I right?

err_code = sd_ant_burst_handler_wait_flag_enable(&burst_wait);

However, the use of sd_ant_burst_handler_request() is a bit hard to guess, maybe an example in the SDK or in the documentation would be nice to have.

RE: Burst transmission triggered many times

testy — Fri, 03 Apr 2015 14:43:13 GMT

This works for me to send 64 bytes of 72:

uint8_t m_burst_data[72];
err_code = sd_ant_burst_handler_request(CHANNEL_1, ((sizeof(m_burst_data))-8), m_burst_data, (BURST_SEGMENT_START | BURST_SEGMENT_END));

Consider:

Burst: the last packet of the burst will be retransmitted on the next channel period if ANT has not received any new data from the master’s host MCU. Advanced Burst: the first packet of the burst will be retransmitted on the next channel period if ANT has not received any new data from the master’s host MCU. Unlike normal burst transfers, the retransmitted data will be the first packet of the burst (the initial 8-byte normal burst packet).

That's for nRF51 master (sends Advanced Burst) -> ANT AP2 81M5IB slave (Burst only capable device):

It's funny, but after I figured this line of code out, today I found exactly the same solution here.

This can help too.