really need keil ULINK cable to program via ISP my uPSD3422EV?

[fabrice239955]

Posted on May 09, 2007 at 08:01

really need keil ULINK cable to program via ISP my uPSD3422EV?

[fabrice239955]

Posted on May 17, 2011 at 11:51

Hello

I use Keil tool to program. I recently bought a rfid dev kit containing a uPSD3422EV. I am new in ST environment and I d like to know if I really need to buy the Keil ULink cable to be able to program (via ISP) my ST microcontroller?

Is there any cheaper way (or cable) to do the same? :o

Thank you in advance for your time.

Regards

fabrice

[vasgrammatikakis]

Posted on May 17, 2011 at 11:51

Didn't the Dev kit contain a programming adapter for Keil?

If not then (as far as I know), there is no other way to program the uPSD for the first time other than the Keil or Resonance adapter.

Once you have programmed the uPSD one time you can create a resident code that will erase/write the flash with your new code from any other peripheral(SPI,Serial UART, USB) etc

[fabrice239955]

Posted on May 17, 2011 at 11:51

Thanks a lot for your reply! :)

I will check if there is a programming adapter once I get the dev kit (should be this week my supplier told me).

If not I will buy the ULINK adapter.

Concerning ''resident code that will erase/write the flash with your new code'' you mentionned, do you know where i could get an example of this kind of code?

Have a good day!

fabrice

[vasgrammatikakis]

Posted on May 17, 2011 at 11:51

Fabrice,

I don't know if there is an example in the uPSD support page in this site(st.com). Check it out first.

If not I can suggest some ways of how to do it, but I don't have an operational code that I can send you.

The simplest way to do it is the following:

1) Reserve some flash space (preferably at the end of the flash) for your ''boot loader'' or boot code. 1 to 5 kBytes should be enough.

2) Your application then must have a deliberate jump to the boot code whenever you want to write the flash. The jump can be performed by an external event (e.g a port pin going low) or software jump.

3) The boot code should then take over the software flow. This means that you should initiate all registers and interupts or else you might be stopped by one of them. The best way is to cause a software reset to the uPSD and upon entry you jump to the boot code immediatelly.

4) Once the uPSD is running the boot code then you can synchronize with a PC and download the object file. The flash control is summarized in the last pages of the uPSD manual.

Good luck.

[fabrice239955]

Posted on May 17, 2011 at 11:51

Thanks a lot for your help and these good advices!

I really appreciate

fabrice