LPC MicrocontrollersのトピックRe: Sudden Power Outage LPC1857

Sudden Power Outage LPC1857

rubensjunior — Wed, 17 May 2023 18:53:30 GMT

Hi friends,

I would like to know how it is possible to save the value set for a variable in flash memory moments before a sudden shutdown of the LPC1857 microcontroller's power supply.

Thanks a lot!

Rubens Júnior

Re: Sudden Power Outage LPC1857

xiangjun_rong — Thu, 18 May 2023 01:43:32 GMT

Hi,

I suppose that you can connect a large bypass capacitor on the 3.3V power supply pins, the LPC1857 has BOD, which can detect the power supply voltage, when the voltage is less than a threshold which is programmable, the BOD will fire an interrupt, in the BOD ISR, you can write the important data to on-chip EEPROM or flash. Because large capacitor is connected, it can keep a long time so that the data can be written reliably.

XiangJun Rong

BOD LPC1857

rubensjunior — Tue, 13 Jun 2023 13:43:57 GMT

Dear @xiangjun_rong,

Please can you help me to find code examples with BOD implementation for LPC1857?

Best regards,

Rubens Júnior

Re: BOD LPC1857

xiangjun_rong — Wed, 14 Jun 2023 01:37:39 GMT

Hi,

Unfortunately, I do not get the BOD example for the LPC1857, but there is BOD example in the LPCOpen package for the LPC4088, pls refer to it.

Hope it can help you

XiangJun Rong