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/telescience | |
| 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/telescience')
| -rw-r--r-- | src-avr/telescience/Makefile | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src-avr/telescience/Makefile b/src-avr/telescience/Makefile index b50559a9..9b04fa6e 100644 --- a/src-avr/telescience/Makefile +++ b/src-avr/telescience/Makefile @@ -18,7 +18,7 @@ DUDECPUTYPE=m32u4 PROGRAMMER=usbtiny LOADCMD=avrdude LOADARG=-p $(DUDECPUTYPE) -c $(PROGRAMMER) -e -U flash:w: -CC=avr-gcc -v +CC=avr-gcc OBJCOPY=avr-objcopy ifndef VERSION @@ -59,7 +59,7 @@ PRODUCT=TeleScience-v0.1 MCU=atmega32u4 PRODUCT_DEF=-DTELESCIENCE IDPRODUCT=0x000a -CFLAGS += -g -mmcu=$(MCU) -Wall -Wstrict-prototypes -Os -mcall-prologues $(PRODUCT_DEF) -I. -DAVR +CFLAGS += -g -mmcu=$(MCU) -Wall -Wstrict-prototypes -O3 -mcall-prologues $(PRODUCT_DEF) -I. -DAVR NICKLE=nickle |