NetBurner Community Forum

By the way
If I make in DMA section(described above code) only 1 byte transferring(citer=biter=nbytes=1), it works properly. In my FOR() loop I can transfer such way all bytes I need, but it has no sense to execute this DMA section many times. We need to put in DMA the number of bytes(for example ...

I tried also to configure previously DMA like in my example, and then to send the first byte(device address) directly writing it to I2C data register. I expected that I2C will start DMA tranfser(as configured previously) after 1-st byte transferring by CPU...
But without any progress...

Yes, we are using Revision 3 of MCF5441X reference manual


===================== CODE============================

START I2C Sequence
------------------------
I set DMAEN bit and Interrupt bit on I2C control register


WRITE I2C Sequence
-----------------------
parameter "channel" = 24

// Reset ...

Hi, All


We realized I2C driver for MOD5441X working properly via CPU interrupts(working with EEPROM).

Due to some timing problems we would like to implement I2C driver writing/reading via DMA.

Copying from memory to memory via DMA also works properly but not from memory to I2C ...

Hello, Dan

DMA Timers APIs work properly except one thing.
When I try to stop timer(exactly as in the example) using 2 functions

timer->stopClear();
timer->clearInterruptFunction();

the system crashes. Do you have any idea about it ?

Thanks in advance

Thanks, I tried, it works perfectly
Earlier, I already implemented such measuring by PIT timers re-scaling, but these timers should be occupied by another services in the project. So, DMA Timers APIs is the solution !

How can I measure the time simple and effective between 2 events in the task(data receiving by MailBox semaphore) using PIT module(may be by reading register and without interrupt). I work on uCos 2, MOD5270.

Thanks in advance
Alexander