Hello,
I am trying to determine the highest datarate possible using the CC1101
radio.
My use case is the transmission of media files.
With the following configuration I have only been able to achieve *1.24KBps*
:
* modulation: 2-FSK
* Frequency: 869,25 MHz
* Datarate: 299.926 KBauds
* udp as transport protocol
* with gnrc_sixlowpan_iphc module disabled
To measure the data-rate I modified udp.c in examples/gnrc_networking
*@ udp.c*
I am printing the time between each packet sent, the time of all packets
sent and the total number of Bytes transmitted. I defined *y* and *n*:
uint32_t *y* *=* xtimer_now*();*
*for* *(*unsigned int i *=* 0*;* i *<* num*;* i*++)* *{*
uint32_t *n* *=* xtimer_now*();*
And *m*, before the for ends and* x* after it finishes
uint32_t *m* *=* xtimer_now*();*
printf*(*"Time per packet (ms): %ld\n"*,(*m*-*n*)/*1000*);*
*}*
uint32_t *x* *=* xtimer_now*();*
printf*(*"Total Bytes sent: %u\n"*,* strlen*(*data*)**num*);*
printf*(*"Total time (ms): %ld\n"*,(*x*-*y*)/*1000*);*
*@Terminal*Packets are sent by:
2016-07-04 14:35:27,609 - INFO # > udp send fe80::ff:fe00:66 5
01234567890123456789 100 9500
which sends through port 5 packets of 20 Bytes, 100 times with a delay of
9500 *us* between them.
As a result I get this:
2016-07-04 12:09:48,179 - INFO # Time per packet (ms): 13
2016-07-04 12:09:48,180 - INFO # Total Bytes sent: 2000
2016-07-04 12:09:48,180 - INFO # Total time (ms): 1612
In addition, with this configuration, I am receiving 38 packets of the 100
packets sent.
When trying to reduce the delay time between each packet to 9 000 *us*, the
transmitter stops and does not send anymore even if I put back delay time
to 9 500 *us, *only transmits back again when I reset it.
The more packets I try to send in that loop the larger the delay between
packets needs to be.
How can I further investigate where the bottleneck comes from? Or if you
have any idea on this issue?
Thanks in advance,
--
América
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