8-bit Microcontrollers中的主题 in need of sample code 9s08qg8

in need of sample code 9s08qg8

miSta — Fri, 11 May 2007 02:41:25 GMT

is there a sample code to use on a demo9s08qg8 to send characters on rs232 port via hypeterm ?

i'm quite new to the hc9s08 and code warrior .. but so far i'm getting the hang of it
i've been playing ard with definitions and sending out via a printf command
and all i got is the character in buffer .. but not in hyperterm ..

thanks ..

Re: in need of sample code 9s08qg8

ThaManJD — Fri, 11 May 2007 15:31:29 GMT

if you include embedded.c into your app and have a look at it you should find it includes a printf function calling terminal.c and those functions in turn calling termio.c. These have to be set up correctly for the QG8 though.

Browse through these and see if you can modifiy them to your purpose.

here's a couple of clues if youre not too familiar with the SCI module.

----code snip-----

void fnSCI_Setup(void)
{
   SCIC1= 0;                                              //8 bits no parity
   SCIC2=(SCIC2_TE_MASK) ;               //trasmit enabled only (no receive), no interrupts
   SCIBDH=0;                                            //these two are used to set up the baud rate
   SCIBDL=0x3B;                                     // values vary depending on how the bus clock is set up.
}

--------code snip---------

BAUDRATE=BUS CLOCK/(16XBR)

where BR is the lower 13 bits of the WORD combination of SCIBDH and SCIBDL

You might consider going into termio.c and changing the TERMIO_Init function to suit your setup.

You could also create your own setup function and relace the TERMIO_Init calls with your own.

Notice in termio.c that the functions are using different methods depending on compile options. Different processors have their bit options in different places etc and the register names differ. If there's no suitable code in any of the options, you'll have to insert your own.

The SCI setup/init should be done before using printf.

John Dowdell

Re: in need of sample code 9s08qg8

bigmac — Fri, 11 May 2007 21:49:08 GMT

Hello,

When using a low level device with very limited resources, such as the S08QG8, I would be very wary about using library functions such as printf or sprintf. Because of the many data formatting options available, they are complex functions that will consume a very significant portion of available MCU resources.

If your requirement is to send ASCII message data, you will consume far less of the resources by using a SCI character send function directly, in order to send string data.

Regards,

Mac

Re: in need of sample code 9s08qg8

peg — Sat, 12 May 2007 05:37:54 GMT

Hi miSta,

I have attached a CW project that heavily uses the serial port for a user interface. This should have all you need to know plus more.

Re: in need of sample code 9s08qg8

irob — Tue, 15 May 2007 23:58:21 GMT

Yes, the DEMO9S08QG8_APP is very nice for getting an RS232 user interface off the ground. I'm using it as well for this purpose.

Re: in need of sample code 9s08qg8

JohnB3 — Wed, 06 Feb 2008 23:59:35 GMT

Hi Peg,

You referenced a sample of Serial Interface programing code for the QG8. It was DEMO9S08QG8_APP.ZIP. I can not open it. Is it still available in some location where it can be downloaded? I am learning the QG8 and really learn a bunch from reviewing "already written" code.

Thanks

John

Re: in need of sample code 9s08qg8

JimDon — Thu, 07 Feb 2008 01:00:59 GMT

Link works for me fine and it opens fine.

Message Edited by JimDon on 2008-02-06 12:02 PM

Re: in need of sample code 9s08qg8

Vncnt — Mon, 19 Sep 2011 09:36:30 GMT

This is my code: (SE8)

MOV #$3F,SCID

MOV #$3B,SCIC1

MOV #$08,SCIC2

MOV #$00,SCIBDH ;9600 Bauds

MOV #$1A,SCIBDL ;9600 Bauds

MOV #$FF,PTCDD

CONT1: EQU $080

CONT2: EQU $081

PROGRAM:

JSR RETA

NOP

BSET 0,PTCD

MOV #$FF,SCID; Write in SCID Send Datas?

JSR N2

MOV #$0F,SCID ; Write in SCID Send Datas?

BCLR 0,PTCD

JSR RETA

NOP

BSET 1,PTCD

LDA SCID ; Read in SCID Send Datas?

JSR N2

BCLR 1,PTCD

feed_watchdog

BRA PROGRAM

RETA:

MOV #$FF,CONT2

MOV #$FF,CONT1

N1 NOP

NOP

DBNZ CONT1,N1

DBNZ CONT2,N2

feed_watchdog

RTS

Is it My configuration in good?, Sending and Reading? anyone used Processor Expert for SCI?, i havent understand which is instruction that used for Reding and Sending.

Re: in need of sample code 9s08qg8

RogerSchaefer — Tue, 27 Sep 2011 02:08:30 GMT

Hi,

I have several projects using 9S08QG8; all make use of the SCI and all are in assembly.

http://www.rasmicro.com/DS18B20.htm

Roger