RE: no activity on MCF5275 QSPI bus

David,

I haven't had much time to analyze your problem, but I've got a hunch I
know what it is. If you're using the QSPI header file provided by
FreeScale check it for typos. I chased my tail last year on a QSPI
problem with this chip and it turned out that the header file was
incorrect.



Regards,


Karel

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of David van Geest
Sent: Thursday, March 13, 2008 2:05 PM
To: Chaloupka, Karel
Subject: [ColdFire] no activity on MCF5275 QSPI bus

Hi all,

I'm having trouble with the QSPI on my M5275EVB.  I've written a test
app that should give me some activity on the bus, according to the
Programming Example in the manual (pg. 24-16).  With an oscope probe
on pin 3 or 5 of J9 (SCK and QSDO, respectively), I don't see ANY
activity - both pins stay at 3.3 V.

The oscope works fine - I've run a whole lot of self-tests, and it
shows similar signals just fine (e.g. the I2C on the same board).

Some more background:  I'm running uClinux on the board.  I was trying
to port the mcf_qspi driver, and when using my ported driver, was
again not seeing any activity on the bus.  I decided to eliminate the
driver as the source of the problem, and instead gave user apps R/W/E
access to the QSPI registers using the PACR registers.

When running the test app, all the QSPI registers seem to be written
correctly.  I've included the test app source and sample program
output below.  Note that I don't have a SPI device attached, which is
why the received data is all 1s.

At this point I'm thinking that either:
a) I've missed something incredibly obvious and am going to look
stupid by sending this email... :-)
b) There's a hardware problem

Can someone take a look at my test app code and help me eliminate that
as a cause?

Thanks!
-David

Test app code (reg definitions provided in a separate file):
int main () {
	// I didn't want to do 12 bit transfers.... 16 bit instead
	// Also, set the baud rate to slowest setting with FF instead of
08
	QMR = 0x83FF;
	if (QMR == 0x83FF)
		printf("Step 1: QMR Write\n");
	
	QDLYR = 0x0404;
	if (QDLYR == 0x0404)
		printf("Step 2: QDLYR Write\n");
	
	QIR = 0xD00F;
	if (QDLYR == 0x0404)
		printf("Step 3: QIR Write\n");
	
	QAR = 0x0020;
	if (QDLYR == 0x0404)
		printf("Step 4: QAR Write\n");
	
	//while (1) {
		int i = 0;
		for (i = 0; i < 4; i++) {
			QDR = 0x7E00;
		}
		for (i = 0; i < 4; i++) {
			QDR = 0x7D00;
		}
		for (i = 0; i < 4; i++) {
			QDR = 0x7B00;
		}
		for (i = 0; i < 4; i++) {
			QDR = 0x7700;
		}
		printf("Step 5: QDR Command Write\n");
		
		QAR = 0x0000;
		printf("Step 6: QAR Write\n");
		
		u16 temp = 0x0000;
		for (i = 0; i < 16; i++) {
			temp = i;
			QDR = temp;
		}
		printf("Step 7: QDR Data Write\n");
		
		QWR = 0x0F00;
		printf("Step 8: QWR Write\n");
		
		QDLYR |= QDLYR_SPE;
		printf("Info: QDLYR is: %x\n", QDLYR);
		printf("Step 9: SPE Set\n");
		
		
		//wait until transfer is complete
		while (1) {
			printf("Step 10: Waiting...\n");
			temp = QIR & 0x0001;
			if (temp == 0x0001)
				break;
		}
		
		QAR = 0x0010;
		printf("Step 11: Write QAR\n");
		u16 receiveBuff[16];
		for (i = 0; i < 16; i++) {
			receiveBuff[i] = QDR;
			printf("Step 12: Received Data at %d is
%x:\n",i,receiveBuff[i]);
		}
	//}
		
	printf("Done!\n");
	
	return(0);

}


Test app output:
Step 1: QMR Write
Step 2: QDLYR Write
Step 3: QIR Write
Step 4: QAR Write
Step 5: QDR Command Write
Step 6: QAR Write
Step 7: QDR Data Write
Step 8: QWR Write
Info: QDLYR is: 8404
Step 9: SPE Set
Step 10: Waiting...
Step 11: Write QAR
Step 12: Received Data at 0 is ffff:
Step 12: Received Data at 1 is ffff:
Step 12: Received Data at 2 is ffff:
Step 12: Received Data at 3 is ffff:
Step 12: Received Data at 4 is ffff:
Step 12: Received Data at 5 is ffff:
Step 12: Received Data at 6 is ffff:
Step 12: Received Data at 7 is ffff:
Step 12: Received Data at 8 is ffff:
Step 12: Received Data at 9 is ffff:
Step 12: Received Data at 10 is ffff:
Step 12: Received Data at 11 is ffff:
Step 12: Received Data at 12 is ffff:
Step 12: Received Data at 13 is ffff:
Step 12: Received Data at 14 is ffff:
Step 12: Received Data at 15 is ffff:
Done!
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