stm8l, eeprom, dma - problem of access

[zheleznjakov]

Posted on June 06, 2011 at 11:56

If writing

(

erasing

)

byte

(word, block)

in the

eeprom

memory

,

DMA

transaction

occurs

on the

periphery

of

RAM

(

tested

only

this

type of

transfer) of

the microcontroller

hangs

(not

working)

.

The documentation

no found 

indication

that it is impossible

to use the

DMA

controller

when working

with

EEPROM

memory

.

Tell me

anything

on this

issue.

P/S

Sorry

for

my

english

#stm8l151k6 #eeprom #dma

[cspeckmann]

Posted on June 10, 2011 at 15:30

I have exactly the same problem:

Writing to the EEprom won't work if the DMA is active. This only happens sometimes, so I suppose this only happens when DMA transfer occurs.

(I'm using the STM8L151G6.)

At the moment my only solution for this is turning off the DMA before writing to the EEPROM.

Then everything works fine.

Is this a STM8L-bug or only not mentioned in the documentation?

[zheleznjakov]

Posted on June 12, 2011 at 06:34

I

can not

stop the

DMA

during

the recording

,

it seems

I will

put the

external memory

.

I wrote

to

customer support

, they

replied

that

passes the request

to the developers.

It has been almost

a week,

but

the answer

or not

:

(

Looks like

a hardware

bug

.

[zheleznjakov]

Posted on July 11, 2011 at 18:30

Dear Mr. Zheleznjakov,

the microcontroller division has confirmed that using DMA during EEPROM update causes a hang-up of the interface to the core - the state ''STALL'' remains active. There is currently no workaround except disabling DMA during EEPROM update.

[Viktor POHORELY]

Posted on July 12, 2011 at 10:20

Dear Mr. Zheleznjakov,

even we have confirmed this limitation recently, investigation is not closed yet. We continue to investigate constraints required to see this limitation and impact on the product and application. We are looking for possible workarounds as well, even there is none know today.

Full information will be released in a week or two as a part of our documentation.

Thanks for understanding

On behalf of MCD Technical Support

[brazov22]

Posted on July 22, 2011 at 09:46

same problem on my side, I was struggling :(

[cspeckmann]

Posted on August 03, 2011 at 13:58

Today I've seen, that STM has just published a new errata-sheet for the STM8L

(

http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/ERRATA_SHEET/CD00237242.pdf

)

There the problems with DMA and EEPROM are described.

According to this errata sheet, there is no fix planned, but they are describing 3 workarounds....

[brazov22]

Posted on August 04, 2011 at 16:28

fine :(