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Pesticide

Posted: Mar 25, 2009 - 10:41 AM

Joined: Mar 16, 2009
Posts: 43
Location: Switzerland

Hi,
Can somebody give me an example how to read and write the user page (flashc.c) of an AT32UC3A?

I do not understand how I can write data to the so called "page buffer" or how I can read from it.

Is the page buffer given or how can I create/address it correctly?

My try:

Code:

// Clear page buffer

flashc_clear_page_buffer();

// Write data to page buffer

// Where and how to write the data to???

// Write user page

flashc_write_user_page();

Code:

// Read data from user page

if (flashc_quick_user_page_read()) {

// Where and how to get the read data???

}

Thanks!
Mathias

Koshchi

Posted: Mar 25, 2009 - 02:34 PM

Joined: Nov 17, 2004
Posts: 13851
Location: Vancouver, BC

Wrong forum. This one is for 8 bit AVRs, try one of the AVR32 forums.

_________________
Regards,
Steve A.

The Board helps those that help themselves.

dl8dtl

Posted: Mar 25, 2009 - 03:04 PM

Joined: Dec 20, 2002
Posts: 7277
Location: Dresden, Germany

Moving it...

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Jörg Wunsch

Please don't send me PMs, use email if you want to approach me personally.
Please read the `General information...' article before.

certsoft

Posted: Mar 25, 2009 - 08:37 PM

Joined: May 21, 2007
Posts: 88
Location: John Day, Oregon, US

Pesticide wrote:

I do not understand how I can write data to the so called "page buffer" or how I can read from it.

Is the page buffer given or how can I create/address it correctly?

I was confused by that as well. The page buffer is 512 bytes located wherever you want it to be Smile

For instance, for the user page it is located at AVR32_FLASHC_USER_PAGE_ADDRESS but when writing normal flash it is located at whatever 512 byte block you want to write to. Keep in mind that the page buffer must be written with 32 bit writes only. For instance:

Code:

unsigned int *psrc, *pdest ;

integer wordcount ;

psrc = (pvoid) &<the source data structure> ;

pdest = (pvoid) AVR32_FLASHC_USER_PAGE_ADDRESS ;

wordcount = (sizeof(<source data structure>) + 3) >> 2 ;

while (wordcnt--)

  *pdest++ = *psrc++ ;

Pesticide

Posted: Mar 26, 2009 - 06:19 AM

Joined: Mar 16, 2009
Posts: 43
Location: Switzerland

Thank you very much! Sorry for having chosen the wrong forum.

Mathias

kalbun

Posted: Jun 10, 2010 - 10:54 AM

Joined: Mar 02, 2010
Posts: 103
Location: Firenze, Italy

certsoft wrote:

you want to write to. Keep in mind that the page buffer must be written with 32 bit writes only. For instance:

Strange enough, the flash controller example written for the EVK1100 uses yet another method to access userpage, with no calls to flashc_write_user_page or flashc_quick_user_page_read.

Indeed the example defines a variable residing in the flash user page with a special attribute

Code:

__attribute__((__section__(".userpage")))

static <variable type> variable;

To write a variable you use

Code:

flashc_memcpy((void *)&dst,(void*)&src,sizeof(CParameters),TRUE);

where <dst> is your flash variable, while <src> could be a temporary buffer in SRAM.
You can read the variable directly. That's all.
The architecture manual of the UC3A declares somewhere that flash can be accessed word by word, sort of EEPROM emulation.
So I really don't understand what all these functions in flashc.h are for... I surely missed something Confused

sma

Posted: Jun 10, 2010 - 11:52 AM

Joined: Jan 14, 2007
Posts: 1836
Location: Nantes, France

Which function in particular?

-sma

vamsi_vvk

Posted: Jun 11, 2010 - 09:17 AM

Joined: Aug 02, 2008
Posts: 98

We have a very good example given in software frame work. Check it out.

sma

Posted: Jun 11, 2010 - 01:06 PM

Joined: Jan 14, 2007
Posts: 1836
Location: Nantes, France

see in DRIVERS/FLASHC Smile

-sma

mittie

Posted: Jul 12, 2010 - 03:14 PM

Joined: Jul 12, 2010
Posts: 1

certsoft wrote:

Pesticide wrote:

I do not understand how I can write data to the so called "page buffer" or how I can read from it.

Is the page buffer given or how can I create/address it correctly?

I was confused by that as well. The page buffer is 512 bytes located wherever you want it to be Smile

Code:

unsigned int *psrc, *pdest ;

integer wordcount ;

psrc = (pvoid) &<the source data structure> ;

pdest = (pvoid) AVR32_FLASHC_USER_PAGE_ADDRESS ;

wordcount = (sizeof(<source data structure>) + 3) >> 2 ;

while (wordcnt--)

  *pdest++ = *psrc++ ;

Hello could you please give an example how can I write to say page 100 using page buffer but without any framework stuff. Where should I allocate the buffer? and how flash controller would know where to fetch data?

kblomqvist

Posted: Jul 15, 2012 - 03:29 PM

Joined: Dec 11, 2011
Posts: 191
Location: Finland

mittie wrote:

Where should I allocate the buffer? and how flash controller would know where to fetch data?

Did you figure that out? Particularly I would like to know how the flash controller knows where the "page buffer" is located. I cannot understand how it could be in any place I want it to be allocated. For example, struggling through ASF. How flashc_clear_page_buffer() call within the flashc_memcpy() function knows where the buffer has been allocated?

Code:

// Clear the page buffer in order to prepare data for a flash page write.

flashc_clear_page_buffer();

error_status |= flashc_error_status;

Code snippet from flashc.c, http://pastie.org/4260763

mstevens84713

Posted: Oct 11, 2012 - 04:15 PM

Joined: Oct 11, 2012
Posts: 2

With Atmel Studio 6.0.1938 (SP1), I see:
bool flashc_quick_user_page_read(void)
{
flashc_issue_command(AVR32_FLASHC_FCMD_CMD_QPRUP, -1);
return flashc_is_page_erased();
}

bool flashc_erase_user_page(bool check)
{
flashc_issue_command(AVR32_FLASHC_FCMD_CMD_EUP, -1);
return (check) ? flashc_quick_user_page_read() : true;
}

NOTE that the page read routine returns "flashc_is_page_erased()", and the erase user page routine returns "flashc_quick_user_page_read()"! Has anyone verified that the code is correct????

catweax

Posted: Oct 11, 2012 - 07:32 PM

Joined: Aug 25, 2011
Posts: 392
Location: Europe

flashc_quick_user_page_read() reads the whole user page and checks whether it’s erased. Triggered by AVR32_FLASHC_FCMD_CMD_QPRUP a status flag is set that indicates whether the page is erased or not. It can be read via flashc_is_page_erased().

So why shouldn’t flashc_erase_user_page() call flashc_quick_user_page_read() to check whether the page was successfully erased? Looks fine to me.

mstevens84713

Posted: Oct 11, 2012 - 08:58 PM

Joined: Oct 11, 2012
Posts: 2

I would expect flashc_quick_user_page_read() to actually read the page and drop it into the page buffer, not return a boolean that says the page had been erased.

catweax

Posted: Oct 11, 2012 - 09:01 PM

Joined: Aug 25, 2011
Posts: 392
Location: Europe

No, that would be a normal read. Have a look at “Quick Page Read” in the datasheet.

abelinschi

Posted: Feb 19, 2013 - 04:11 AM

Joined: Oct 10, 2011
Posts: 1

Hi,

If not answered, I am using this code to save and read user page without using the framework:

Code:

//

// Write to Flash Controller register with an offset and value provided

//

void FlashController::writeRegister(uint16_t offset, int32_t value) {

   int32_t *p = (int32_t *)(AVR32_FLASHC_ADDRESS + offset);

   *p = value;

}

//

// Read from Flash Controller register with an offset

//

int32_t FlashController::readRegister(uint16_t offset) {

   int32_t *p = (int32_t *)(AVR32_FLASHC_ADDRESS + offset);

   return *p;

}

//

// Write words into Flash user page

//

void FlashController::writeUserData(uint32_t *src, int words) {

   // Send Clear Buffer Page command to the Flash controller

   writeRegister(AVR32_FLASHC_FCMD, (AVR32_FLASHC_FCMD_KEY_KEY << AVR32_FLASHC_FCMD_KEY_OFFSET) | AVR32_FLASHC_FCMD_CMD_CPB);

   waitForFlashReady();

   // Copy data to buffer page

   uint32_t *dst = (uint32_t *)AVR32_FLASHC_USER_PAGE_ADDRESS;

   while (words--) {

      *dst++ = *src++;

   }

   // Send Write User Page command to the Flash controller

   writeRegister(AVR32_FLASHC_FCMD, (AVR32_FLASHC_FCMD_KEY_KEY << AVR32_FLASHC_FCMD_KEY_OFFSET) | AVR32_FLASHC_FCMD_CMD_WUP);

   waitForFlashReady();

}

//

// Read words from Flash user page

//

void FlashController::readUserData(uint32_t *dst, int words) {

   // Copy data from buffer page

   uint32_t *src = (uint32_t *)AVR32_FLASHC_USER_PAGE_ADDRESS;

   while (words--) {

      *dst++ = *src++;

   }

}

//

// Wait for Flash Controller Ready status

//

void FlashController::waitForFlashReady() {

   while (!readRegister(AVR32_FLASHC_FSR) & AVR32_FLASHC_FSR_FRDY_MASK);

}

kblomqvist

Posted: Mar 04, 2013 - 06:47 AM

Joined: Dec 11, 2011
Posts: 191
Location: Finland

abelinschi wrote:

Hi,

If not answered, I am using this code to save and read user page without using the framework:

Code:

// See above ...

And I'm using this https://github.com/aery32/aery32/blob/m ... flashc.cpp

mikech

Posted: Mar 12, 2013 - 07:20 AM

Joined: Aug 19, 2003
Posts: 398
Location: Australia

To abelinschi and kblomqvist, I thank you for those flash-memory routines.
They helped me understand how the FLASHC actually works.

I have also saved almost 2.5 kbytes of codespace by not using the ASF FLASHC routines. Smile

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