+- PINE64 (https://forum.pine64.org)
+-- Forum: PINE A64(+) (https://forum.pine64.org/forumdisplay.php?fid=4)
+--- Forum: Pine A64 Hardware, Accessories and POT (https://forum.pine64.org/forumdisplay.php?fid=32)
+---- Forum: POT modules (https://forum.pine64.org/forumdisplay.php?fid=8)
+---- Thread: I2C Expansion Board (/showthread.php?tid=1813)
RE: I2C Expansion Board - martinayotte - 07-28-2016
(07-27-2016, 09:33 PM)khgoh Wrote: Hi,
This is the schematic for the i2c POT board.
Thanks !
That clarify why other pins were also initialized with pullups, they are the interrupts.
RE: I2C Expansion Board - martinayotte - 07-28-2016
(07-27-2016, 04:54 PM)martinayotte Wrote: I think I've succeed to place new DTS entries for S_TWI (PL8/PL9), it is now appearing as /dev/i2c-3 as I've prescribed in an DTS alias.
The only thing is that I didn't test with some hardware yet, I'm usually using TWI0 (/dev/i2c-0).
I will probably try tomorrow using dupont jumpers and will post back.
Unfortunately, false victory, at least until now.
The SoC does'nt seem to communicate on the pins, although no complain in dmesg, not even seeing their pullups, "i2cdetect -y 3" still choking.
I'm running out of ideas...
RE: I2C Expansion Board - xalius - 07-28-2016
Do you have your changes to the dts on github?
RE: I2C Expansion Board - khgoh - 07-28-2016
(07-28-2016, 06:21 AM)DonFL Wrote:Just put it up in the wiki at http://wiki.pine64.org/index.php/POT#POT:_Multi_I2C_Bus_.28PMI2C01.29(07-27-2016, 09:33 PM)khgoh Wrote: Hi,
This is the schematic for the i2c POT board.
Thanks for sharing. Hoping this can be added to the wiki for easy reference (along with the other POT device schematics....).
RE: I2C Expansion Board - martinayotte - 07-28-2016
(07-28-2016, 03:58 PM)xalius Wrote: Do you have your changes to the dts on github?
No, I'm usually doing commit only and things are working and are ready for PR.
So, here is a gist snippet instead :
https://gist.github.com/martinayotte/145d11b2ef77b0a999027ee53ecc2b84
RE: I2C Expansion Board - xalius - 07-28-2016
(07-28-2016, 05:46 PM)martinayotte Wrote:(07-28-2016, 03:58 PM)xalius Wrote: Do you have your changes to the dts on github?
No, I'm usually doing commit only and things are working and are ready for PR.
So, here is a gist snippet instead :
https://gist.github.com/martinayotte/145d11b2ef77b0a999027ee53ecc2b84
Thanks, that is about as far as I got in my attempts too... but I could not figure out how to set the interrupts =.... attribute, can you help me out there? I wonder if those devices in the CPUS domain need any special configuration?
RE: I2C Expansion Board - martinayotte - 07-28-2016
For interrupt, following the specs sheet, it was pretty easy to determine that the s_twi is 0x2c (76 in the specs, but offsetted by 32) since the s_uart is 0x26 (70 in specs) (except if the previous offsetting is wrong), maybe I should try to get rid of this offset which I don't know where it is coming from.
Problem can also be from clock and reset, which are not using apb0_gates/apb0_reset like other sunxi such H3 where the I2C on i2c@01f02400 is working.
I hate this PineA64 DTS since it is coming from a decompiled version from AllWinner and doesn't follow rules used in Mainline, where apb0_gates/apb0_reset doesn't even exist.
EDIT: I've checked the interrupt on H3, and it is really 0x2C (76 with offset of 32). Som it must be something else, the clock or the reset.
RE: I2C Expansion Board - Artyom - 07-30-2016
Hi. About latest version IDE CodeBlocks. http://forum.pine64.org/showthread.php?tid=1896 This is the first test version of the manual writing in two languages. If you have any comments and suggestions please send them to me by e-mail blademoon@yandex.ru. I sincerely hope that it will help you.
RE: I2C Expansion Board - tllim - 07-30-2016
(07-30-2016, 06:31 AM)Artyom Wrote: Hi. About latest version IDE CodeBlocks. http://forum.pine64.org/showthread.php?tid=1896 This is the first test version of the manual writing in two languages. If you have any comments and suggestions please send them to me by e-mail blademoon@yandex.ru. I sincerely hope that it will help you.
Thanks on the IDE CodeBlocks..
RE: I2C Expansion Board - AndrewC78 - 08-16-2022
Gentlemen,
Could you please guide me taking the below info into account?
# ./enable_i2c_pullup
I/O Port for Pine64 I2c POT pull up enabled.
# sudo i2cdetect -l
i2c-1 i2c mv64xxx_i2c adapter I2C adapter
i2c-0 i2c DesignWare HDMI I2C adapter
# i2cdetect -y 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: 30 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
# i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
I've got an impression the second read isn't effective.