Post Created date
TWI and *slave* TX arbitration (not master TX)
david.prentice wrote:The slaves will have to arbitrate themselves as to who pulls the SMBALERT line low. But that's equivalent to saying the slaves are not using the SMBALERT...
Sunday, 25 May 2008 - 22:24
[AP7000] RTC is to fast
Check your power supply. I have one board with an ultracheap power supply, that runs fast like that. Another board, with a better power supply, runs nicely at 32K or so. Of...
Friday, 16 May 2008 - 06:22
i2c-atmeltwi and SMBus Quick command
For the pcf8574 chips you should use drivers/gpio/pcf857x.c ... so the driver_name should be "pcf857x", and you should provide platform_data as in so that it plugs into the GPIO...
Wednesday, 14 May 2008 - 00:06
Interupt frequency
At that IRQ rate you might investigate using that "sample ready" line as a DMA request signal instead of an IRQ line. Or, depending on what you're doing, just polling.
Monday, 5 May 2008 - 18:09
U-Boot gpio
You should just be able to write the various registers directly from the u-boot shell. Type "help" and you'll see a bunch of commands listed; "mw.l" (memory write long) rings a...
Monday, 5 May 2008 - 10:07
I2C Communication
The rev 03 spec is more current than 2.1 ... dated june 2007. Link courtesy Wikipedia. Not that an AVR will get you the Fm+ megabit speeds. :?
Monday, 5 May 2008 - 10:02
To everyone using gpio-dev, use cases
If you've configured for example GPIO_PIN_PB(27) as an input (or even as an open drain output), just request_gpio(gpio_to_irq(GPIO_PIN_PB(27)), ...) to use that input as an...
Saturday, 3 May 2008 - 18:21
NGW100 SD card write speed
Re write speeds to SD: isn't there a way to pre-erase blocks on SD and/or MMC cards, so that writes can go faster? I don't think that any Linux filesystems (other than MTD based...
Thursday, 1 May 2008 - 08:24
GCC (non)usage of r0
EW wrote:-Wl,--relaxNo difference, on top of the whole-program optimization at least. But no coredumps either. CountZero wrote:, it's back...
Saturday, 26 April 2008 - 16:51
GCC (non)usage of r0
There *is* no WinAVR 20080411, at least nothing downloadable ... ;) Since this fits in 2KB, "-fwhole-program --combine" saves a bunch of bytes (52); I'm glad to know I can make...
Saturday, 26 April 2008 - 12:39
GCC (non)usage of r0
Quote:Is code space *that* tight?With GCC 4.2.2, yes it is -- very much so. With GCC 4.3.0, much less so ... if I prevent bad inlining decisions with "noinline" attributes, it...
Friday, 25 April 2008 - 18:01
GCC (non)usage of r0
After looking at the gcc-4.3.0/gcc/config/avr files, I think the best fix probably has to be along the lines of teaching the GCC internal representation (RTL) to treat...
Wednesday, 23 April 2008 - 18:06