diff options
| author | Keith Packard <keithp@keithp.com> | 2011-08-12 04:41:19 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2011-08-12 04:41:19 -0700 |
| commit | b3ba69f3eda0d07d7f2fc0922556a011c95d7951 (patch) | |
| tree | b648004575edcf3a0a4cf6c600f47bd06d45d8b5 /src-avr/ao.h | |
| parent | b6083ce00867051d4d513b91519cad6e4a91f07b (diff) | |
altos-avr: Completely replace the spi slave code
Turns out the AVR we're using sucks at doing SPI slave. To get it
running at a reasonable data rate, I had to completely gut the
'sensible' code and run everything from the ISR with interrupts
disabled.
Even with this, the maximum SPI clock rate is somewhere around
200kHz. That's due to the singled buffered nature of the transmit
queue, the amount of time available between finishing one byte and
starting the next is very very small.
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'src-avr/ao.h')
| -rw-r--r-- | src-avr/ao.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/src-avr/ao.h b/src-avr/ao.h index c548c618..fb3612d4 100644 --- a/src-avr/ao.h +++ b/src-avr/ao.h @@ -201,7 +201,7 @@ struct ao_adc { * ao_adc.c */ -#define AO_ADC_RING 16 +#define AO_ADC_RING 8 #define ao_adc_ring_next(n) (((n) + 1) & (AO_ADC_RING - 1)) #define ao_adc_ring_prev(n) (((n) - 1) & (AO_ADC_RING - 1)) @@ -1343,6 +1343,7 @@ struct ao_fifo { (f).remove = ((f).remove + 1) & (AO_FIFO_SIZE-1); \ } while(0) +#define ao_fifo_reset(f) ((f).insert = (f).remove = 0) #define ao_fifo_full(f) ((((f).insert + 1) & (AO_FIFO_SIZE-1)) == (f).remove) #define ao_fifo_empty(f) ((f).insert == (f).remove) @@ -1423,13 +1424,16 @@ ao_debug_init(void); /* ao_spi_slave.c */ -void +int ao_spi_slave_read(uint8_t *data, int len); -void +int ao_spi_slave_write(uint8_t *data, int len); void +ao_spi_slave_debug(void); + +void ao_spi_slave_init(void); /* ao_companion.c */ |