diff options
| author | Keith Packard <keithp@keithp.com> | 2011-09-21 11:39:24 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2011-09-21 11:45:05 -0700 |
| commit | c8a00bb9ccdf0d4257f037c2bf996ce5e6b0b0c0 (patch) | |
| tree | cef91c9361b9455078ee4393281333c0ae6af784 /src/core/ao.h | |
| parent | abf17522c206b465375b73a004a6d67bfa714ba3 (diff) | |
altos: Pre-compute RDF packet len at compile time
Instead of computing the RDF packet len at run time, which takes a
pile of code space.
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'src/core/ao.h')
| -rw-r--r-- | src/core/ao.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/core/ao.h b/src/core/ao.h index 1d5769cb..c28c4549 100644 --- a/src/core/ao.h +++ b/src/core/ao.h @@ -1341,8 +1341,18 @@ ao_radio_recv(__xdata void *data, uint8_t size) __reentrant; void ao_radio_recv_abort(void); +/* + * Compute the packet length as follows: + * + * 2000 bps (for a 1kHz tone) + * so, for 'ms' milliseconds, we need + * 2 * ms bits, or ms / 4 bytes + */ + +#define AO_MS_TO_RDF_LEN(ms) ((ms) > 255 * 4 ? 255 : ((ms) >> 2)) + void -ao_radio_rdf(int ms); +ao_radio_rdf(uint8_t pkt_len); void ao_radio_rdf_abort(void); |