68300

I'm not sure what happened to the file.  I will try to attach it again.
Anyone who doesn't get it, but wants it can reach me at cwade@....

Cathy

(See attached file: 68331uart.c)


                                                                                                                                       
                      jeffrey.tenney@gm                                                                                                
                      .com                     To:       68300@yahoogroups.com                                                         
                                               cc:                                                                                     
                      09/10/02 10:59 AM        Subject:  Re: [68300] MC68376 QSM SCI                                                   
                      Please respond to                                                                                                
                      68300                                                                                                            
                                                                                                                                       
                                                                                                                                       





The attachment doesn't seem to be there.  Does Yahoo strip attachments?

Or is it just my e-mail program?

Jeff





cwade@... on 09/10/2002 08:38:49 AM

Please respond to 68300@yahoogroups.com

To:    68300@yahoogroups.com
cc:
Subject:    Re: [68300] MC68376 QSM SCI



Hello John,

I have not written a comms driver for the 68376, but I have one for the
68331 which is similar.  Here you go.  Hope it helps with your questions.

Cathy
(See attached file: 68331uart.c)



                      "john_gma"
                      <johnshaffer@mail        To:
                      68300@yahoogroups.com
                      .com>                    cc:
                                               Subject:  [68300] MC68376
                      QSM SCI
                      09/10/02 10:30 AM
                      Please respond to
                      68300






Hello all,

I am writing a serial driver for the QSM SCI.

My question is in regards to the interrupt handling.

There does not seem to be a separate ISR.
How do I clear the interrupts?

There are 2 flags I need to use, TDRE and TC.

The book says that the flags are cleared by:
1. reading SCSR (OK, I do that)
2. Writing to TDR (I don't always want to do this)

So, how do I acknowledge the interrupt without transmitting something?

Can I write $0000 to SCSR?

Thanks

John







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