Messages in this thread | | | Date | Mon, 25 Feb 2019 12:24:09 +0200 | From | Andy Shevchenko <> | Subject | Re: [PATCH v5 0/3] i2c: at91: slave mode support |
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On Fri, Feb 22, 2019 at 10:25:19AM +0100, Ludovic Desroches wrote: > [Ludovic Desroches: see Changes section] > > Based on the discussion we had on the i2c-linux list [1], I wrote a patch for > AT91 hardware and tried to fulfill the Linux I2C slave interface description > [2] as good as possible. This enables aforementioned hardware to act as an I2C > slave that can be accessed by a remote I2C master. > > I have tested this patchset successfully on an ATSAMA5D27. > > ^ 3.3V ^ 3.3V > +-----------------------+ | | +-----------------------+ > | Slave: ATSAMA5D27 | +-+ +-+ | Master: ATSAMA5D35 | > | with i2c-slave-eeprom | | | 100k | | 100k | with i2cset | > +-------------------+-+-+ +-+ +-+ +-+-+-------------------+ > | | | | | | > | +------+---------|---(SDA)---+ | > +------------------+---(SCL)-----+ > > Schematic: Connection of slave and master with 100kOhm pullup resistors. > > On the master the following BASH script has been used to stress the slave. > > root@emblinux:~# cat ./stress.sh
> #!/bin/bash
Not everybody has bash in their environments. See below, how easily to switch to regular shell.
#!/bin/sh
> I=0 > while true > do > if i2cset -y -r 1 0x64 0 $I w | grep mismatch > then > echo "$(date): Error in transmission ${I}" > fi
> ((I++))
I=$(($I+1))
> if [ $I -eq 65536 ] > then > I=0 > echo "$(date): Sent 65536 transmissions" > fi
This one can be optimized to
for I in $(seq 65536); do ... done
> done > > After running the script for some time I had the following output. To me this > looks promising :) > > root@emblinux:~# ./stress.sh > Thu Nov 9 13:58:45 CTE 2017: Sent 65536 transmissions > Thu Nov 9 14:35:20 CTE 2017: Sent 65536 transmissions > Thu Nov 9 15:12:11 CTE 2017: Sent 65536 transmissions > Thu Nov 9 15:49:04 CTE 2017: Sent 65536 transmissions > Thu Nov 9 16:26:00 CTE 2017: Sent 65536 transmissions > Thu Nov 9 17:03:07 UTC 2017: Sent 65536 transmissions > Thu Nov 9 17:40:15 UTC 2017: Sent 65536 transmissions > > If you have some hardware with an at91-i2c interface included at hand, I really > would appreciate if you can run the test script on your hardware and test this > driver. > Thu Nov 9 17:40:15 UTC 2017: Sent 65536 transmissions > > If you have some hardware with an at91-i2c interface included at hand, I really > would appreciate if you can run the test script on your hardware and test this > driver.
-- With Best Regards, Andy Shevchenko
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