Linux/BQ27542-G1: Failed to authenticate gauge during device boot up

Shaohua Wu

Part Number: BQ27542-G1

Tool/software: Linux

Hi , TI guys

we use bq27542 to authenticate battery. During our device booting up , a chellange string will be sent to gauge and then read back digist 100 milliseconds later. The result always be failed.

For example,

[ 17.142771] send : 5a51d81d67846b28899a9637906d230d7022e960
[ 17.213142] read : 4051d81d67846b28899a9637906d230d7022e960
[ 17.213182] expect: ee566c285456083b722ff6c5d206f61e80bac1bc
[ 17.213620] Battery Auth Failed

[ 17.142771] send : 5a51d81d67846b28899a9637906d230d7022e960
[ 17.213142] read : ee566c285456083b722ff6c5d206f61e80bac1bc
[ 17.213182] expect: ee566c285456083b722ff6c5d206f61e80bac1bc
[ 17.213620] Battery Auth Pass

We can see that when failed to authenticate, the result read is almost same as send string except the first byte.

But after retry servel times, the expect result will be read. How can I rise this success rate?

over 7 years ago

0 Onyx Ahiakwo over 7 years ago

TI__Guru* 76230 points

Hi Shaohua,
Can you try increasing the delay from 100ms to 200ms and see if that helps?
thanks
Onyx

0 Shaohua Wu over 7 years ago in reply to Onyx Ahiakwo

Prodigy 130 points

Hi, Onyx
In fact, a longer delay is not effective. I have completed a sys file node to send challenge string and read digist manually. I echo the challenge string to this node by commaned line and read digist several seconds later , the result also like highlight in description.

0 Onyx Ahiakwo over 7 years ago in reply to Shaohua Wu

TI__Guru* 76230 points

Hi Shaohua,
I am out of ideas on this one, but let me check with our firmware engineers and get back to you
thanks
Onyx

0 Shaohua Wu over 7 years ago in reply to Onyx Ahiakwo

Prodigy 130 points

Hi, Onyx

any update? I have tried many delay combinations, but still always failed. All failures happend during system boot up, after system booted,the authentication process successful almost every time.

Power management

Power management forum

Linux/BQ27542-G1: Failed to authenticate gauge during device boot up