RE: no activity on MCF5275 QSPI bus

Sounds like the pin assignments aren't setup right.  I've not used the
5275, but the 5208 and 5329 both have PAR configuration bits that need
to assign the I/O pins to QSPI.

Rich Carter
603-897-2071
 

> -----Original Message-----
> From: [email protected] 
> [mailto:[email protected]] On Behalf Of David van Geest
> Sent: Thursday, March 13, 2008 3:05 PM
> To: Carter, Richard
> 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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