Can add a power module for P3541 B01?

hi,For example battery?
你好,请问一下,这边是否支持在底座的边沿版新增一个纽扣电池,用来保存系统的时间?
如果可以的话,这边电源纽扣商品的链接地址有么??


jetson nano B01的外接我这边应该怎么连接??

For RTC design, please refer to the nano Design Guide and devkit carrier schematic (P3449) in DLC.


sorry,我这边看了一下,不知道找哪个文档,这边能帮忙给点提示么,实在抱歉了

Below two docs:

Jetson Nano Product Design Guide

Jetson Nano Developer Kit Carrier Board Design Files (P3449 B01)

Hi,

Please check if below method would make RTC time work after reboot.

1. disbale NTP

# timedatectl set-ntp false

2. set time

# date -s "2019/5/26 14:11:30"
Tue May 26 14:11:30 HKT 2019
# date
Tue May 26 14:11:32 HKT 2019

3. sys time to HW clock

# hwclock -w -f /dev/rtc1
# hwclock -r
2019-05-26 14:13:50.771134+0800

4. reboot device, and check the clock

# date

Sun May 26 14:15:28 HKT 2019

Hello, the method makes RTC time work after reboot, but not after power off.
Once I power off, RTC resets to year 2000 and local/universal time to 2018.

Have you followed the DG and schematic to add the backup battery in correct way?

i didn’t add the diode ,i just add the DS3231 mode and it didn’t work.

Did you measure the voltage level of battery to make sure it provides supply correctly?

ok,i know what you means, i use the 3V voltage.

sorry ,i have used the CR2032 cell battery, 3.3V and it doesn’t work, i think should i install the DS3231 moudle in the /dev/rtc2 ???

Could you check what is your /dev/rtc is pointing to? /dev/rtc0 or /dev/rtc1?

可以請你確認一下你的nano上面的/dev/rtc 是指到哪個device? /dev/rtc0 還是 /dev/rtc1?

sorry,我看了一下,使用lsmod命令查看了,没有绑定成功,所以既不是/dev/rtc0,也不是/dev/rtc1,


另外请问一下是否需要升级内核??

所以你是自己接了一個DS3231然後想要自己新增一個rtc device ?

是的,是这个意思

關於這個我們沒有經驗. 所以沒辦法回答.

以前好像有其他user有過類似的

另外, 你的截圖上看起來你根本沒build出 kernel… 說實話這種error log你應該自己先解讀一下吧…

是的,现在在编译这块的内核版本,主要我们是这边是做纯软件开发的,不到万不得已不涉及嵌入式开发的。

是的,这边看了他们类似的操作流程,也遇到和他们类似的问题了,目前也没有解决。

…你的error log目前就只是 “找不到kernel_src.tbz2”

請問你確定這是你要問我們的問題?

对不起,不是问这个问题,是想参考别人的流程做一遍的,你们给的外接电容二极管我们也会尝试的。