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| author | Keith Packard <keithp@keithp.com> | 2016-04-25 18:48:47 -0400 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2016-04-25 18:48:47 -0400 |
| commit | 27319e4edbc503f193475b437fa5fe2937d47cbe (patch) | |
| tree | ec123c1035b007a3dcc64518ff9bb92ede2ebcff /src/kernel | |
| parent | 7c9a111ac1c88467ce28e03b4a9d3eabc9d7015b (diff) | |
altos/stm32l: Add support for software-driven HW flow control
This allows applications to request that the flow control bits be
driven from software rather than hardware, permitting more flexible
pin configuration.
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'src/kernel')
| -rw-r--r-- | src/kernel/ao.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/kernel/ao.h b/src/kernel/ao.h index a794ba71..6ed0299e 100644 --- a/src/kernel/ao.h +++ b/src/kernel/ao.h @@ -820,6 +820,8 @@ struct ao_fifo { } while(0) #define ao_fifo_full(f) ((((f).insert + 1) & (AO_FIFO_SIZE-1)) == (f).remove) +#define ao_fifo_mostly(f) ((((f).insert - (f).remove) & (AO_FIFO_SIZE-1)) >= (AO_FIFO_SIZE * 3 / 4)) +#define ao_fifo_barely(f) ((((f).insert - (f).remove) & (AO_FIFO_SIZE-1)) >= (AO_FIFO_SIZE * 1 / 4)) #define ao_fifo_empty(f) ((f).insert == (f).remove) #if PACKET_HAS_MASTER || PACKET_HAS_SLAVE |