BQ40Z80: NAK bailout issue

Hi Jessica,

I appreciated your great support!

What does the picture means below? thanks!

Many Thanks,

Jimmy

Hi Keller,

We appreciated your great support!

Customers have tried to use i2C  commands to read the battery information without the driver, but this situation still occurs. What is the reason?

Many Thanks,

Jimmy

Hello Jimmy,

What method are you using to read from the gauge without the driver?

I would recommend communicating with the EV2400 as a reference and look at the communication with a logic analyzer to confirm if your driver/communication method is within the communication specification for SMBus.

Sincerely,

Wyatt Keller

Hi Keller,

We appreciated your great support always!

it’s only i2cget -y 0 0xb 0xd w.

The method of reading is the simplest R/W.
#!/bin/sh i=1 while [ "$i" -le 600 ]; do # cat /sys/class/power_supply/sbs-5-000b/uevent > /tmp/powinfo.txt i2cget -y 0 0xb 0xd w echo $i i=$(( i + 1 )) sleep 1 done

Use driver; cat /sys/class/power_supply/sbs-5-000b/uevent > /tmp/powinfo.txt 
Without driver: i2cget -y 0 0xb 0xd w


Many Thanks,
Jimmy

Hi Jimmy,

As Wyatt mentioned, we recommend communicating with the EV2400 as a reference and look at the communication with a logic analyzer to confirm if your driver/communication method is within the communication specification for SMBus. It is difficult for us to debug their communication when they aren't using our tools because we are not familiar with their API/drivers. Also, please ensure that the customer is using SMBus and not I2C.

Best,

Jessica