topic EEE_DRV_InitEeprom() function call takes too long in MPC5xxx

EEE_DRV_InitEeprom() function call takes too long

alexShen_ — Fri, 13 May 2022 09:39:28 GMT

MCU: MPC5775E

IDE : S32k Ds for power

EEE_DRV_InitEeprom() initialization takes 1.3 seconds at each power-up. I have configured 3 64k blocks for EEPROM. Is the initialization time of this eeprom normal? thanks

alexShen__0-1652434548992.png

Re: EEE_DRV_InitEeprom() function call takes too long

lukaszadrapa — Mon, 16 May 2022 05:25:39 GMT

Hi Alex,

the SDK documentation does not contain details about the timing, so let me share documentation for previous standalone version of the drivers - attached. Take a look at "5.1.1 Initialization/Read/Write Timings". MPC5775K is relatively close to MPC5775E, so we can use this one as a reference. This is the timing for three 16KB blocks. As you can see in the table, worst initialization timing is about 100ms. Because the erase time of 64KB is significantly higher:

lukaszadrapa_0-1652678524087.png

... and because you can have much more data there, it can take much more time.

To ensure the highest possible performance, make sure that clocks are initialized to maximum before calling init function and also ensure that correct flash wait states are configured and that instruction cache is enabled:

https://www.nxp.com/docs/en/application-note/AN5191.pdf

Regards,

Lukas

Re: EEE_DRV_InitEeprom() function call takes too long

alexShen_ — Mon, 23 May 2022 08:41:54 GMT

Hi Lukas:

The clocks are initialized to maximum before calling init function.My test is based on the EEPROM Demo project. Use IO to test the EEE initialization time. EEE_Init() will take 1.3 seconds under the EEPROM with data.The following is my test project, thank you!

alexShen__0-1653294799440.png