8-bit MicrocontrollersのトピックBurst programming from a FLASH Block to another one. - HCS08GT60.

Burst programming from a FLASH Block to another one. - HCS08GT60.

Johan_SOMFY — Tue, 11 Dec 2007 22:16:40 GMT

Hi all,

In order to defrag a FLASH part used to store non volatile data, I try to programm another FLASH zone in burst mode.

I do this on a HCS08GT60.

The data I need to write are in another FLASH location. So during the Flash programming algorithm, I do a read access in FLASH (more precisely just before the "WRITE TO FLASH TO BUFFER ADDRESS AND DATA" ) to get my data.

The result is that the first data is well written when I look at the FLASH with the debugger but all the following data are not correctly written (they are all to 0x04 when I look to the FLASH with the debugger ??????).

No FACCER is detected.

I suppose the read access in FLASH during the burst programming sequence is forbidden and can explain this comportment.

Anybody can help me ?

Added p/n to subject.

Message Edited by NLFSJ on 2007-12-11 01:18 PM

Re: Burst programming from a FLASH Block to another one.

Bruce_andrew — Tue, 11 Dec 2007 22:32:00 GMT

Are you executing the write command from flash or RAM? You can't read from flash, for data or code execution, while a write/erase operation is happening, which is why you need to have a function that runs in RAM. Is that your problem?

Re: Burst programming from a FLASH Block to another one.

Johan_SOMFY — Tue, 11 Dec 2007 22:49:56 GMT

Hi Bruce,

thanks for your help.

In fact I execute the burst write command from RAM, but during this execution in RAM, I do a read access in FLASH in order to get the data I want to write to another FLASH place.

regards

Johan

Re: Burst programming from a FLASH Block to another one.

bigmac — Wed, 12 Dec 2007 02:28:42 GMT

Hello Johan,

For burst programming, the data would also need to reside in RAM. Alternatively, you would need to program one byte at a time.

Regards,

Mac

Re: Burst programming from a FLASH Block to another one.

Johan_SOMFY — Wed, 12 Dec 2007 15:56:40 GMT

Hi BigMac,

thank you for your confirmation about burst mode. I was suspicious about the data to be in RAM. I think we will write one byte at a time as this is working well even if it is slower.

Regards,

Johan

Re: Burst programming from a FLASH Block to another one. - HCS08GT60.

Bruce_andrew — Sun, 16 Dec 2007 04:48:07 GMT

How big is the block of data you need to copy?

I think it would be faster to copy the source data from flash to RAM. Then do a burst mode write to flash, from the RAM cache to flash. You only need 32 bytes for each burst mode write, if RAM is tight.

Re: Burst programming from a FLASH Block to another one. - HCS08GT60.

Johan_SOMFY — Mon, 17 Dec 2007 21:46:18 GMT

Hello Bruce,

The amount of data we have to tranfer is not so big. We effectively copy the data from flash to RAM in order to do a burst programming from RAM to Flash and everything is working well !

Thanks for your help,

Regards

Johan