resandevinwebb, btw thank you for sharing the information. This is of personal interest for me as well.
On Tue, Nov 25, 2014 at 5:58 PM, William Hermans <[email protected]> wrote: > Ah ok my mistake I misread your post initially as I did not read the whole > thing sorry. > > So yes, I would think you would have to write your own kernel module, or > modify the existing I2C bus utils. Recompile, etc. > > On Tue, Nov 25, 2014 at 5:52 PM, William Hermans <[email protected]> > wrote: > >> *> i2cdetect -l* >>> *> on Beaglebone Black it will give you:* >>> *i2c-0 unknown OMAP I2C adapter N/A* >>> *i2c-1 unknown OMAP I2C adapter N/A* >>> >> >> Ok, so I2C to the PMIC does work. A person on the group got this working >> from within uboot and posted about it over a month ago. >> >> When i asked, "ok great, but how does that translate to this working >> while under linux?" He / she replied: something to the effect of "I'm >> unsure". >> >> Anyway, the point is it is possible to control the PMIC, or at minimum >> communicate with it via software + I2C. I am however not a Linux kernel >> expert / guru, but I *would* assume this would require a kernel level >> driver to work. >> >> >> On Tue, Nov 25, 2014 at 2:31 PM, <[email protected]> wrote: >> >>> Hi liyaoshi, >>> >>> So how can I measure the charge percentage left in the battery? Is there >>> an example that I can use? TPS65217 does not allow us to read the battery >>> voltage if I am right or at least I cannot find it in datasheet. what >>> voltage are you talking about? >>> >>> I did some progress with controlling PMIC and I can use i2c utilities to >>> read and write to it. However I have to use -f to force it since kernel is >>> using the I2C interface. How can I do this cleanly from user space without >>> forcing it? One way would be to expand the driver to add extra features. >>> Does anyone know a good example that I can use as starting point? Is there >>> a better/easier way to do this? >>> my procedure is as follow: >>> >>> i2cdetect -l >>> on Beaglebone Black it will give you: >>> >>> i2c-0 unknown OMAP I2C adapter N/A >>> >>> i2c-1 unknown OMAP I2C adapter N/A >>> >>> >>> For reading status register of TPS65217. device is at 0x25 and status >>> register is 0x0a on I2C0 >>> >>> i2cget [-f] [-y] i2cbus chip-address [data-address [mode]] >>> >>> >>> sudo i2cdet -f 0 0c24 0x0a >>> >>> WARNING! This program can confuse your I2C bus, cause data loss and >>> worse! >>> >>> I will read from device file /dev/i2c-0, chip address 0x24, data address >>> >>> 0x0a, using read byte data. >>> >>> Continue? >>> [Y/n] >>> 0x88 >>> >>> >>> To set battery charging voltage to 4.2V >>> >>> i2cset [-f] [-y] [-m mask] [-r] i2cbus chip-address data-address [value] >>> ... [mode] >>> sudo i2cset -f -m 0x30 0 0x24 0x05 0x20 >>> >>> WARNING! This program can confuse your I2C bus, cause data loss and >>> worse! >>> >>> I will write to device file /dev/i2c-0, chip address 0x24, data address >>> >>> 0x05, data 0x20 (masked), mode byte. >>> >>> Continue? [Y/n] >>> >>> Old value 0x80, write mask 0x30: Will write 0xa0 to register 0x05 >>> >>> Continue? [Y/n] >>> >>> >>> Thanks a lot >>> >>> >>> >>> On Monday, November 24, 2014 6:08:45 PM UTC-8, liyaoshi wrote: >>>> >>>> As I know , if only 2 wires , you can not access the Li+battery status >>>> , you can just get voltage value from PMU >>>> >>>> There always another 1 wire to get the communication with MCU in >>>> battery module >>>> >>>> 2014-11-25 8:52 GMT+08:00 <[email protected]>: >>>> >>>>> Hi All, >>>>> >>>>> I connected a rechargeable Li+ battery to my BBB TP5, TP6, TP7, and >>>>> TP8. I shorted TP5 and TP6 and added a 10uF decoupling capacitor. In >>>>> addition, I connected TS to GND with a 9K resistor which is 10K || 75K >>>>> according to the datasheet and the board boots fine from battery. >>>>> Now my question is that how can I monitor the battery status(how much >>>>> they are charged) or change the setting of PMIC, TPS65127C from shell. For >>>>> instance, I would like to set the charging voltage to 4.2 rather than the >>>>> default 4.1V. Or I would like to turn on/off WLED etc. Is there a tool, >>>>> like Alsamixer, for this? if not what would be the best approach for >>>>> controlling PMIC from shell? I posted it here because PMIC uses I2C >>>>> interface to talk to AM335x. >>>>> >>>>> >>>>> <https://lh4.googleusercontent.com/-E-wdJPfnG5U/VHPNaDDU9WI/AAAAAAAAAAo/tEjegAyAzAM/s1600/bbb-batt-srm.jpg> >>>>> >>>>> >>>>> <https://lh3.googleusercontent.com/-d7FQ9BVS6J4/VHPNtiSxI4I/AAAAAAAAAAw/3_g2aL5Q2K4/s1600/bbb-batt1.jpg> >>>>> >>>>> Thanks for your time and consideration. >>>>> >>>>> -- >>>>> For more options, visit http://beagleboard.org/discuss >>>>> --- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "BeagleBoard" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>> >>>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
