Charlie, Thanks a lot for clearing my doubts.I shall get back to you if I encounter any other problems.Glad to have subscribed to this group!I've learnt so much!!Thanks once again. Sudha -----Original Message----- From: Melear Charles-rdph40 [mailto:charles.melear@...] Sent: Thursday, September 04, 2003 7:21 PM To: '68300@yahoogroups.com' Subject: RE: [68300] M68332 Sudha, When you are using the QSPI to program a serial EEPROM, you can use several different methods and this will depend on how you write your QSPI driver. I imagine that your QSPI driver is set up to send an address, a control byte and then the data to program a particular address in the EEPROM. Now, if you DO NOT use the "continuous" mode in the QSPI, you simply load up the Transmit Data RAM and the associated Command RAM bytes and start the QSPI. The QSPI will take the first byte at the location pointed to by the Start Queue Pointer and continue transmitting until the End Queue Pointer is reached. Whether you get an interrupt on not, the QSPI will finish the transmission. Now, it may be the case that you DO use the QSPI in the CONTINUOUS mode. In this case, once the QSPI is started, it will take the first byte from the location pointed to by the Start Queue Pointer, go to the End Queue Pointer and then loop back to the New Queue Pointer. In this case, the QSPI will just keep going regardless of whether you get an interrupt or not. When using the CONTINUOUS mode, your software will have to kill the QSPI process by clearing the CONT bit and then waiting for the SPE bit to self clear. (NOTE: very important -- you DO NOT want to kill a QSPI transmission by clearing the SPE bit. This will mess up the transmission of the byte that is currently being transmitted.) A TIMER interrupt is not going to affect the operation of the QSPI. The QSPI will just keep going if it is in the CONTINUOUS mode. The QSPI will finish transmitting the current buffer if it is NOT in the CONTINUOUS mode. So, the question becomes something like this: If I am programming the serial EEPROM and I get a TIMER interrupt, is it OK to go service the TIMER and then come back to the programming job. From what I know about your application, this should be totally OK. If the QSPI is doing something, it will either complete the process (not in CONT mode) or the QSPI will just keep looping on a process (CONT mode enabled). So, when you come back from the TIMER ISR, you should just be able to continue from where you left off. Regards, Charlie -----Original Message----- From: sudha srinivasan [mailto:sudha_sri@...] Sent: Thursday, September 04, 2003 6:01 AM To: 68300@yahoogroups.com Subject: RE: [68300] M68332 Charlie Thanks for your response. The scenario is like this.I am interfacing the SEEPROM with QSPI of M68332.The application calls for a Timer Interrupt occurring every 2 ms.In such a situation,if there is a need to write into the SEEPROM and the write takes more than 2ms,How does M68332 handle this? Is there a possibilty of doing a part of the QSPI operation, servicing the timer interrupt and then continuing the rest of the QSPI operation?If yes ,how do we go about this? Kindly respond Sudha -----Original Message----- From: Melear Charles-rdph40 [mailto:charles.melear@...] Sent: Tuesday, September 02, 2003 7:06 PM To: '68300@yahoogroups.com' Subject: RE: [68300] M68332 Sudha, This is a hard question to answer because I am not sure what is going on. However, I will take a stab at it. If the QSPI is in the middle of a transmission, nothing will change because another module caused an interrupt. Once the QSPI is set up and a transmission is started, the transmission will go until it is completed. In other words, if the CONT mode is NOT selected and the transmission starts, the QSPI will continue sending data until the End Queue Pointer is reached. Why do you think that an interrupt will modify the QSPI behavior. If I haven't answered your question, post me some more info and I will try again. Charlie -----Original Message----- From: sudha srinivasan [mailto:sudha_sri@...] Sent: Monday, September 01, 2003 6:30 AM To: 68300@yahoogroups.com Subject: [68300] M68332 Dear all, Please help me with the following info : If QSPI is enabled and if an external interrupt or a timer interrupt occurs, the program control is transferred to the SIM module. In this context, will the QSPI operation be resumed ,after servicing the ISR.(Please note that the QSPI is not in interrupt mode). Will the SCK from QSPI to the serial device ,stop as soon as the interrupt is encountered? Thanks Sudha Yahoo! 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RE: [68300] M68332
2003-09-05 by sudha srinivasan