RE: Queued SCI with Interrupts on MPC555
"David Eicher" <[email protected]>
| Newsgroups | gmane.comp.hardware.motorola.microcontrollers |
|---|---|
| Message-ID | <[email protected]> |
Hi Allan, Okay, I see it. I was mis-interpretting what that meant. I was thinking my code would clear QTE. But now I see it is marked as being cleared by hardware. Also, I thought the flow diagram was showing a complete transfer of a transmit message. But it is not, It is showing the hw/sw required to initiate transmit, and then ONE pass through the interrupt service routine, so if you need more than one pass, you have to mentally re-enter this flow diagram somewhere and start a transmit again. I was not picking up on that. Appreciate your help, Dave _____ From: [email protected] [mailto:[email protected]] On Behalf Of Dobbin Allan-r11834 Sent: Thursday, December 08, 2005 8:48 AM To: [email protected] Subject: RE: [MPC500] Queued SCI with Interrupts on MPC555 I sort of said this in my larger mail, but just want to point out the documentation DOES say that QTE gets cleared, so it is necessary to set it again each time. It is not spelled out in the register description, but it is shown at the bottom of the 'Queue Transmit Flow' diagram. There should be no need to set TE again. Allan -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of David Eicher Sent: Thursday, December 08, 2005 8:46 AM To: [email protected] Subject: RE: [MPC500] Queued SCI with Interrupts on MPC555 Hi Alfonso, Yep, I've studied Chap 14.9 extensively. I'm using the quickstart package so appconfig.h has the necessary config items in it, and these get loaded into the control registers by QSCI_INIT command. That part seems to be working okay. I can load the queue with 16 bytes and kick off a transmission by setting QTE and TE, the 16 bytes go out. Then I get a QBHE interrupt. I clear this interrupt in the ISR, set size back to 16, load 16 bytes in the queue again, and after that I get unreliable results. First of all, nothing will go out from this ISR unless I set QTE and TE again (the need to do that is NOT mentioned anywhere in the documentation). I get intermittent results now, sometimes it transmits another 16 bytes from the ISR, sometimes not. I can't seem to get a combination of code that works reliably. Suggestions? Thanks much for your help, Dave _____ From: [email protected] [mailto:[email protected]] On Behalf Of Alfonso Gambuzza Sent: Thursday, December 08, 2005 1:42 AM To: [email protected] Subject: AW: [MPC500] Queued SCI with Interrupts on MPC555 Hallo David, Two years ago I implemented Queued SCI which musst be implemented with interrupts. The code works well with the MPC555 and MPC565 and we are using it right now. The code is based on the description in the users-guide for MPC555 Cap. 14.9. In the documentation you will find some flowcharts that helps but... it is not so simple to let it run... since (as I remember) you have to set some registers in the *.cfg or in the startupcode that are not described in the chapter. Bye Alfonso Gambuzza David Eicher wrote: > Hello, > > > > Anyone have any experience with the subject matter? I've followed the > examples in the demo code in the quickstart package, the top half and > bottom half interrupts/flags just don't seem to work they way they > suggest. The users manual for MPC555 doesn't give a lot of detail, but > I have not succeeded in transmitting a string of bytes using > interrupts yet. Using a polling method I was able to get transmit > working using the transmission queue. > > > > Thanks for any help you might be able to offer, > > > > Dave > > > > > > [Non-text portions of this message have been removed] > > > > ----------------------------------------------------------- > To learn more about Freescale Microcontrollers, please visit > http://www.freescale.com/mcu > > > > > > > SPONSORED LINKS > Freescale semiconductor inc > <http://groups.yahoo.com/gads?t=ms <http://groups.yahoo.com/gads?t=ms <http://groups.yahoo.com/gads?t=ms&k=Freescale+semiconductor+inc&w1=Free> &k=Freescale+semiconductor+inc&w1=Free scal > &k=Freescale+semiconductor+inc&w1=Freescal e+semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+ e+semiconductor+micr oprocessor&c=4&s=106&.sig=K2HGv-zFlv5OYUv_QxIq_Q> > Microcontrollers > <http://groups.yahoo.com/gads?t=ms <http://groups.yahoo.com/gads?t=ms <http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Freescale+semic> &k=Microcontrollers&w1=Freescale+semic ondu > &k=Microcontrollers&w1=Freescale+semicondu ctor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microproces ctor+sor& c=4&s=106&.sig=SYHwNJjjGQXRvtt_GybT4g> > Pic microcontrollers > <http://groups.yahoo.com/gads?t=ms <http://groups.yahoo.com/gads?t=ms <http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Freescale> &k=Pic+microcontrollers&w1=Freescale> &k=Pic+microcontrollers&w1=Freescale > +semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051 > +microprocessor&c=4&s=106&.sig=umVbbnUwsPzEzKKD_pQfUw> > > 8051 microprocessor > <http://groups.yahoo.com/gads?t=ms <http://groups.yahoo.com/gads?t=ms <http://groups.yahoo.com/gads?t=ms&k=8051+microprocessor&w1=Freescale+> &k=8051+microprocessor&w1=Freescale+> &k=8051+microprocessor&w1=Freescale+ > semiconductor+inc&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+ > microprocessor&c=4&s=106&.sig=NO-nSKjHoAlh9XtZ8LB1_A> > > > > ---------------------------------------------------------------------- > -- > YAHOO! 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