topic I2C: Unexpected transfer complet interrupt in Digital Signal Controllers

I2C: Unexpected transfer complet interrupt

matthiasuhlmann — Thu, 05 Feb 2015 10:44:23 GMT

Hi All,

I have a I2C Slave using interrupts.

Now i have the problem that from time to time there is a unexpected "Byte Transfer" Interrupt which is at a strange position (in the middle of a Byte).

Do anybody know this behavior and know a solution? Did i made something wrong?

Best Regards

Re: I2C: Unexpected transfer complet interrupt

xiangjun_rong — Fri, 06 Feb 2015 02:15:04 GMT

Hi,Mattias,

Could you tell us the part number you are using? do you use Processor Expert to develop code? what version of CodeWarrior tools are you using? I suggest you paste or attach the code so that we can check it.

XiangJun Rong

Re: I2C: Unexpected transfer complet interrupt

matthiasuhlmann — Fri, 13 Feb 2015 09:52:16 GMT

Hi XiangJun,

Part Nr.: MC56F84769; I don't use Processor Expert, Code Warrior: Version: 10.3, Build Id:121211

I can not attach or paste the code because i made a library which is maybe a little bit difficult to read (registers are set by enumerations wich can be selected in the application)

But here are the registers after initialisation:

I changed priority level from 0 to 1 which solved my problem. At the moment I2C is robust and there were no more unexpected interrupts. If i have enought time i will ask you again in future but for the moment its ok.

Thank You!

Matthias