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Keep count of number of shortfalls.

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To enable this, we keep a count of the current shortfall length. Each
time an SGPIO read/write cannot be completed due to a shortfall, we
increase this length. Each time an SGPIO read/write is completed
successfully, we reset the shortfall length to zero.

When a shortfall occurs and the existing shortfall length is zero, this
indicates a new shortfall, and the shortfall count is incremented.

This change adds one cycle to the normal RX & TX paths, to zero the
shortfall count. To enable this to be done in a single cycle, we keep a
zero handy in a high register.

The extra accounting adds 10 cycles to the TX and RX shortfall paths,
plus an additional 3 cycles to the RX shortfall path since there are
now two branches involved: one to the shortfall handler, and another
back to the main loop.
This commit is contained in:
Martin Ling
2021-12-24 09:09:16 +00:00
parent 0f3069ee5e
commit a7bd1e3ede
5 changed files with 54 additions and 12 deletions
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13
host/hackrf-tools/src/hackrf_transfer.c
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@@ -1159,9 +1159,11 @@ int main(int argc, char** argv) {
if (result != HACKRF_SUCCESS)
fprintf(stderr, "\nhackrf_get_m0_state() failed: %s (%d)\n", hackrf_error_name(result), result);
else
fprintf(stderr, ", %d bytes %s in buffer\n",
fprintf(stderr, ", %d bytes %s in buffer, %u %s\n",
tx ? state.m4_count - state.m0_count : state.m0_count - state.m4_count,
tx ? "filled" : "free");
tx ? "filled" : "free",
state.num_shortfalls,
tx ? "underruns" : "overruns");
} else {
fprintf(stderr, "\n");
}
@@ -1216,9 +1218,12 @@ int main(int argc, char** argv) {
fprintf(stderr,
"Transfer statistics:\n"
"%lu bytes transferred by M0\n"
"%lu bytes transferred by M4\n",
"%lu bytes transferred by M4\n"
"%u %s\n",
stats.m0_total,
stats.m4_total);
stats.m4_total,
state.num_shortfalls,
(transmit || signalsource) ? "underruns" : "overruns");
}
}