topic Re: LPC43S37 issue reading E2prom after power-up in LPC Microcontrollers

LPC43S37 issue reading E2prom after power-up

StefanoGattazzo — Wed, 04 Mar 2020 23:50:34 GMT

Hi Everyone,

I have a customer using the LPC43S37JET100 that has a problem with internal E2prom.

After Power-on sometimes it is not possible to read the e2prom - the reading value is always 0.

See below the calls related - BSP is LPCOpen 3.02 for LPC43S37.

In the manual a time is specified for e2prom reset:

This time is not included in the SW - if the customer is adding a delay the function seems to work fine.

The customer wants to know if we can confirm this is the issue and no others.

Stefano

Re: LPC43S37 issue reading E2prom after power-up

xiangjun_rong — Thu, 05 Mar 2020 06:03:11 GMT

Hi, Stefano,

I think it is the reason to read incorrect EEPROM data. After power-up, you have to delay some time until the EEPROM initialization is over, then read EEPROM.

Hope it can help you

XiangJun rong

Re: LPC43S37 issue reading E2prom after power-up

StefanoGattazzo — Thu, 05 Mar 2020 07:40:30 GMT

Hi xiangjun.rong ,

In fact, adding a delay, it seems the issue disappears.

The customer wants to have the confirmation this is the issue and not others.

In our SW seems the delay is not inserted.

BR
Stefano

Re: LPC43S37 issue reading E2prom after power-up

xiangjun_rong — Mon, 09 Mar 2020 01:53:31 GMT

Hi, Stefano,

I think it is the issue. The EEPROM has to be initialized before user can read/write, in other words, user can read/write EEPROM only after the EEPROM initialization is over.

Hope it can help you

XiangJun Rong