How to use ECM in DSP/BIOS

转自：http://e2e.ti.com/support/dsp/tms320c6000_high_performance_dsps/f/112/t/63395.aspx

问题描述：

Hello Ti's engineers,

       I want to use ECM module in DSP/BIOS, so I have followed the instructions at page 150 in the datasheet of TMS320C6000 DSP/BIOS 5.x Application Programming Interface Reference Guide. Besides I used GPIO module to produce a external interrupt when it had detected a falling edge of GPIO signals. And I'm sure that this method is successful when I used HWI module directly. After I had transformed HWI into ECM, it didn't work, programme couldn't run into the ISR of event which was configured in ECM module in DSP/BIOS. I had checked the registers about  ECM and I could see that the EVTFLAG, EVTMASK and MEVTFLAG were all right.

      So, I want to know if there are some details I had missed. And my DSP/BIOS is v5.31.02.

     Thank you!

解决方法：

Did you map the corresponding ECM interrupt (e.g. #0-3) to one of the DSP interrupts (e.g. 4-15)?  There are a few pieces to doing this and I think the documentation is a tad vague, so perhaps I can help.

Let's say you're combining events 32-63 (i.e. ECM interrupt #1).  Let's say you're mapping the ECM interrupt to CPU interrupt #5.  You would need to do the following:

• Right-click HWI5 and select Properties.
• For the "interrupt selection number" enter 1 (i.e. for EVT #1)
• For the "function" enter _ECM_dispatch
• Click on the Dispatcher tab.
• Tick the checkbox "Use dispatcher"
• The "Arg" should be the same as what you entered for "interrupt selection number", in this example 1.
• (Optional) Change the interrupt mask as desired.  Generally I recommend setting it to "all" so there is no pre-emption of hardware interrupts and I try to keep ISRs short and sweet.  This helps prevent stack overflows to do many nested interrupts.

 Brad