Re: TPU Problem

Hi Eric

Many, many thanks for your reply. It's nice to know that experts like 
you are around to give us newbies some help.

I have implemented your comments but still the TPU 'hangs'.

I note your comment about the link channel code, originally I was 
attempting to run this function on channel 3 and linking to a 
different function on channel 1, hence the extra (commented out) code.

I have also now negated all three latches at the end of phase. 

As you stated the END_OF_LINK is as per your comment.

If you don't mind I will attach my 'C' source code for the program I 
am running. Note that this board is running on an Axiom PB-0555 board 
therefore all of the relevant CPU registers have been initialised by 
the monitor program. As you will see from my program I have inserted 
a number of checks of TPU register values but they all seem to be as 
expected.

I really can't see why it doesn't work...hopefully someone else can!!

Please note that at present I don't have any development tools. So I 
have no way of debugging apart from well positioned print functions. 
I hope to purchase the full Ashware simulator and some debugger 
hardware for the CPU (and hopefully the TPU) if I can be happy that 
this device is suitable for my purposes. 

Many thanks again for your help.

Best regards

Steve Wiggins


CODE FOLLOWS:

#include "diab.h"
#include "serial.h"
#include "mpc555.h"
#include "tpu_pwm.h"
#include "mpc500_util.h"
#include "mpc500_util.c"

void delay();

struct TPU3_tag *tpua = &TPU_A;   /* pointer for TPU routines */

UINT8 sqw_chan = 0;
UINT8 meas_chan = 1;
UINT16 tempValue;

UINT8 *ptrDest = (UINT8 *)0x302000;
unsigned char myString[100];

const UINT8 acTPUROM [0x800] = {
#include "hexout.txt"
};

/************** TPU Set up **************/
/* Set up the TPU....                      */
void setup_tpu(struct TPU3_tag *tpu)
{
//     tpu->TPUMCR.R = 0x2020; /* TCR1 prescaler divide by 2, 
supervisor and user acces. */
	tpu->TPUMCR.R = 0x2400; /* TCR1 prescaler divide by 2, 
supervisor and user acces.  changed run in TPU 1 Mode and emulation 
mode*/
	tpu->TPUMCR3.R = 0x0040; /* enable enhanced prescaler - 
divide by 2 */
}


main(){
	char choice;
	int i=0;
	UINT8 myData;
	
	
	delay();	// delay in case hardware needs time

	InitCom(0);	// initialize SCI1 serial port 1
	ioport = 0;	// default to 0 for now, don't detect.

	delay();	// delay in case hardware needs time

	for(i=0; i<0x800; i++)
	{
		myData = acTPUROM[i];
		*ptrDest = myData;
//		sprintf(myString,",%02x ", myData);
//		puts(myString);
		ptrDest++;
	}
	sprintf(myString,"\n\nTPU Functions Written\n");
	puts(myString);
	
	// check TPUMCR value before configuration
	tempValue = tpua->TPUMCR.R;
	sprintf(myString,"\n\nTPU MCR = %0x\n", tempValue);
	puts(myString);
		
	setup_tpu(tpua); /* Do general TPU set up. */
	
	// check TPUMCR value after configuration
	tempValue = tpua->TPUMCR.R;
	sprintf(myString,"\n\nTPU MCR = %0x\n", tempValue);
	puts(myString);


    tpu_disable( tpua, sqw_chan);
	tpu_disable( tpua, meas_chan);
    
    /* SQW is function 14                  */
    tpu_func( tpua, sqw_chan, 0x0e);

    /* disable interupts on channels so they can be configured safely 
*/
    tpu_interrupt_disable( tpua, sqw_chan );
	tpu_interrupt_disable( tpua, meas_chan );


	tpua->PARM.R[sqw_chan][0] = 0x7000;
    tpua->PARM.R[sqw_chan][2] = 0x0002;

	tpu_hsr(tpua, sqw_chan, 0x03);
    tpu_enable(tpua, sqw_chan, TPU_PRIORITY_HIGH);
	delay();
	
    tpu_func( tpua, meas_chan, 0x0f);

	tempValue = tpua->CFSR3.R;
	sprintf(myString,"\n\nCFSR3 = %04x\n", tempValue);
	puts(myString);

	tempValue = tpua->CPR1.R;
	sprintf(myString,"\n\nCPR1 = %04x\n", tempValue);
	puts(myString);

	for(; ;){
		choice = tolower(GetSByte());
		i++;
		if(i % 2)
		{
			puts("\nEnable Measure Func");
			tpu_hsr(tpua, meas_chan, 0x03);
			tpu_enable(tpua, meas_chan, TPU_PRIORITY_LOW);
		}
		else
		{
			puts("\nDisable Measure Func");
			tpu_disable(tpua, meas_chan);
		}
		// display values of CPR1 & CFSR3 Registers
		tempValue = tpua->CPR1.R;
		sprintf(myString,"\n\nCPR1 = %04x\n", tempValue);
		puts(myString);
		tempValue = tpua->CFSR3.R;
		sprintf(myString,"CFSR3 = %04x\n", tempValue);
		puts(myString);
	}
}

void delay(){
	unsigned long delaycount;

	delaycount=0;
	do{
		delaycount++;
	}while(delaycount < 1000);
}




--- In [email protected], Eric McRae <eric@e...> wrote:
> Your link code (which is commented out) is running on channel 1 and 
is 
> also asserting a link to channel 1 so be careful if you enable that.
> 
> I think you may also be leaving yourself open to a match occurring 
due 
> to whatever hardware state existed before starting this function.  
If a 
> match does occur, the TPU will spin on calling TRANS_MES since MRL 
is 
> not negated there.  Still, that shouldn't prevent channel 0 from 
running.
> 
> BTW, zeroing the priority of a function only prevents it from 
starting 
> but will not stop a function if it happens to already be running.
> 
> It looks like your transition detection function shouldn't run 
forever.  
> My first suspicion is that the configuration registers aren't set 
up 
> correctly for channel 1.  Typically, the only way a normally 
running 
> channel ceases to function is when a function on another channel 
> clobbers the normal channel's data or that other function never 
releases 
> the TPU Engine by hitting an end instruction.  You don't show 
> END_OF_LINK but I presume it is a "chan neg_lsl; end"  Take a look 
at 
> the scheduler registers if you can they may tell you something.




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