A9 stops working after several resets

[faithware]

I have been using the A9 chip for a good 4 years. I have circumvented several issues with the SDK but I can't find the solution for stopping. When power is down and the battery is running low, the A9 chip will reset all the time until it stops and can't work again until the device is reflashed. [12:03:17.357] : Detected event: 0xffffffff [12:03:17.449] : Detected event: 0xf07a0000 [12:03:17.489] : Detected event: 0xf07a0002 [12:03:17.489] : Detected event: 0x89550002 [12:03:17.499] : Detected event: 0xfe900800 [12:03:17.499] : Detected event: 0xfe901b00 [12:03:17.519] : Detected event: 0x00000004 [12:03:17.520] : Detected event: 0x66660021 [12:03:17.520] : Detected event: 0x0000000f [12:03:17.520] : Detected event: 0x00000000 [12:03:17.527] : Detected event: 0x001660c8

Is there a solution for this? Has anyone encountered this?

[garudaonekh]

@faithware do you figure out why? I faced this same issue as well which I just reflashed it.

[faithware]

@garudaonekh the system reset event should happen after this one, it looks like it is hanging there, I suppose it is a boot loader issue. In the board I have I have added a microcontroller to monitor the power supply and cut off the power when the battery voltage is under 3.6V. So that the A9 doesn't reset multiple times because of low power. I am assuming the reset happening too many times will make the bootloader fail. It is only speculations and we hope that @Neutree has a solution for this.

[peterjschulze]

Hi All We have about 20 devices in the field for over 2 years now.We connect the power supply(mains) to the usb connector and a battery to the battery connections on the board, we have no issues. If the battery voltage drops below 3.2v the device switches off and restarts without issue when the usb power returns. Thank you, hope this helps. Peter Sent from Mail for Windows From: Gnichi MohamedSent: Monday, 20 June 2022 10:47To: Ai-Thinker-Open/GPRS_C_SDKCc: SubscribedSubject: [Ai-Thinker-Open/GPRS_C_SDK] A9 stops working after several resets (Issue #515) I have been using the A9 chip for a good 4 years.I have circumvented several issues with the SDK but I can't find the solution for stopping.When power is down and the battery is running low, the A9 chip will reset all the time until it stops and can't work again until the device is reflashed.[12:03:17.357] : Detected event: 0xffffffff [12:03:17.449] : Detected event: 0xf07a0000 [12:03:17.489] : Detected event: 0xf07a0002 [12:03:17.489] : Detected event: 0x89550002 [12:03:17.499] : Detected event: 0xfe900800 [12:03:17.499] : Detected event: 0xfe901b00 [12:03:17.519] : Detected event: 0x00000004 [12:03:17.520] : Detected event: 0x66660021 [12:03:17.520] : Detected event: 0x0000000f [12:03:17.520] : Detected event: 0x00000000 [12:03:17.527] : Detected event: 0x001660c8—Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you are subscribed to this thread.Message ID: ***@***.***> 

[Vetal7979]

was there any solution? I have a device powered from a 12V car socket that periodically works exactly the same way. Without flashing, further work is impossible

[faithware]

I don't advise you to use this chip for commercial projects. I have sold 200 pcs, at least half of those have the same problem. It is unbelievable.

On Thu, 25 Jan 2024, 13:39 Vetal7979, @.***> wrote:

was there any solution? I have a device powered from a 12V car socket that periodically works exactly the same way. Without flashing, further work is impossible

— Reply to this email directly, view it on GitHub https://github.com/Ai-Thinker-Open/GPRS_C_SDK/issues/515#issuecomment-1910121016, or unsubscribe https://github.com/notifications/unsubscribe-auth/AJE6DQCARF7SII6ED54CINTYQJHABAVCNFSM5ZIDU3IKU5DIOJSWCZC7NNSXTN2JONZXKZKDN5WW2ZLOOQ5TCOJRGAYTEMJQGE3A . You are receiving this because you were mentioned.Message ID: @.***>