FLASH programming

[stuart2399]

Posted on March 07, 2008 at 13:47

FLASH programming

[stuart2399]

Posted on May 17, 2011 at 12:25

Dear All,

I am trying to get FLASH programming & erasing working. I have successfully got the ST Flash example program to work.

I have my own RCC clock setup. When I use that, the flash does not program properly.

Since I'm not using the ST library, I've turned off the HSI oscillator (since I've got an external crystal).

If I disable HSI, flash programming doesn't work.

If I enable HSI, it does!

I can't seem to find it in the manuals, but I assume the HSI clock is used for programming the flash?

Is this correct?

Thanx.

[asterix]

Posted on May 17, 2011 at 12:25

Hi wobble, STOne-32

I have also the same pb :( anyone could help us to understand how the flash is clocked when programming ? It seems that the charge pump is using the internal RC (HSI).

Thanks , Asterix.

[smart]

Posted on May 17, 2011 at 12:25

where do we enable the HSI oscillator.

I was looking at the example code under the flash section I could not see where we enable the HSI oscillator.

In the function void RCC_Configuration(void) I could see how we enable the HSE oscillator not HSI.

[stuart2399]

Posted on May 17, 2011 at 12:25

Thanks ST-One, I missed that!

[16-32micros]

Posted on May 17, 2011 at 12:25

Dear asterix, wobble,

You are right and this information is already mentioned in Flash programming manual PM0042: Page 9/31. It is more clear now ? :)

Cheers,

STOne-32

[lanchon]

Posted on May 17, 2011 at 12:25

@smart.avr,

haven't seen the example you mention, but I believe the HSI will be enabled unless you specifically turn it off.

[stuart2399]

Posted on May 17, 2011 at 12:25

Hi smart.avr

In my code, I'm accessing the RCC Control register directly. The HSI is bit 0. Not using the libraries, but here's my code:

#define STM32_RCC_CR_HSION 1

//Turn on the internal oscillator

RCC->CR = RCC->CR | STM32_RCC_CR_HSION;

Hope this helps.

:)

[smart]

Posted on May 17, 2011 at 12:25

if you download the ARM-based 32-bit MCU STM32F101xx and STM32F103xx firmware library under that you will get the UM0427 Zip file.

Over there you can find out the 2 example code under the flash section.