Re: Regarding McBSP Int ...help needed...

[Matthew Percival <matthew@capgo.com>]

G'Day,

> Void McBSPRxInterrupt(Void)
> {   
>       Uns McBSP1Data;
>      Uns InterruptStatus; 
>       
>       //code to check if the interrupt is from McBSP1 or McBSP3
>      InterruptStatus = inw(_LEV2_SIR_FIQ);
>      
>      if(InterruptStatus & 0x0002)
>      {
>       
> 	  McBSP1Data = inw(_MCBSP1_DRR1); // copy contents of McBSP
> receive
> //register to variable
>       
> 	}
> 	
> }

	It looks like you have the start right, but the end is missing
something.  Here is an ISR from my DSP code:

void level21_handler(Arg arg)
{
	MdUns irq = read_reg(DSP_L21_SIR_FIQ);
	timer_handler();
	write_reg(read_reg(DSP_L21_CONTROL) | NEW_FIQ_AGR, DSP_L21_CONTROL);
}

	You need to write NEW_FIQ_AGR to DSP_L20_CONTROL (L2.0 for McBSP; L2.1
here because it is a GPTimer) at the end of your ISR.  If I am
remembering correctly, this tells the Interrupt module that you have
completed servicing the current interrupt, and for it to calculate the
next interrupt to be serviced.  This is in a 5912, but there should be
something equivalent in the 5910.

	-- Matthew