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] <javascript:>>: > >> 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] <javascript:>. >> 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.
