Hi,
I tried to use sigrok-cli to sample an 8MHz SWO signal in Ubuntu and
Raspbian. But, I met a problem.
*sigrok-cli -d fx2lafw -c samplerate=24MHz -C 0=SWO,1=LED0,2=LED2 -O vcd -o
d.vcd --time 1s*
*Device only sent 12966912 samples.*
*12966912 samples equal to about 550ms.*
The lower frequency signals are no problem.
Then, I wrote the code by using *libusb-1.0* and referring to *libsigrok*
to solve the problem *with submission before send_samplerate.*
* buf_fill_len = 240128;*
* int count = 100;*
while(count--)
{
img_transfer = libusb_alloc_transfer(0);
libusb_fill_bulk_transfer(img_transfer, dev_handle, 2
|LIBUSB_ENDPOINT_IN, data_inbuf.buf_fill, buf_fill_len, fn_recv, NULL, 0);
ret = libusb_submit_transfer(img_transfer);
if(ret != 0 )
{
printf("sub ret = %d\n,count = %d\n", ret, count);
}
}
However, I just got 69 times successful submission, 31 times submission
with return *LIBUSB_ERROR_IO*, and 12006400 samples, equal to about 500ms.
I noticed *submission before send_samplerate (only 30 times) *and *submission
in LIBUSB_CALL *are combined in libsigrok.
But, for my part, what should I do to get a sample of more than 50 seconds.
Finally,
Thank you for the inspiration to design HATBED. On this day we honor all
sigrok contributors sincerely.
Thanks,
Yi
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