What function/pins to use for a transceiver??

Started by gogosgeorge March 17, 2005

Hi guys,

What can I use for transmitting and receiving via a transceiver? I
have 2 9s12E128 Development Boards, and have 2 RF-NRF401 422Mhz
single chip RF-Transceivers. I want to hook one to one Board and
Transmit, and the other board with the other transceiver to receive.
It will only be one way communication, so they wont both be sending
and receiving. They only have a TXD and RXD pins to use for this,
the other pins are for frequency select, am/fm, vcc, etc. So, I only
need 2 pins for transmission.

What functions are there for sending in the least complicated way? I
will only be sending values between 0decimal and 200decimal, but
have no idea what options are available to me, nor how to use them.
Can someone please suggest how I can do this (well, what pins and
what registers. I looked up IIC and SPI. can it just be as simple as
using a port (say 2 pins of port A as output) and transmitting
through that, and 2 pins of port A on the other boar as inputs and
receiving that way? Would that work fine? Seems the simplest way,
but im unsure. Please help




In a message dated 3/17/05 4:06:36 A.M. Eastern Standard Time,
writes:

What can I use for transmitting and receiving via a transceiver? ==================================
Pretend the transmitter and receiver are a wire. Use the SCI.


but what pins would I use for it? Can I use any General I/O pins??
George Gogos
Undergraduate
BACHELOR OF ENGINEERING(Computronics/Electronics)
Deakin University, Australia ----- Original Message -----
From:
To:
Sent: Thursday, March 17, 2005 11:21 PM
Subject: Re: [68HC12] What function/pins to use for a transceiver??
In a message dated 3/17/05 4:06:36 A.M. Eastern Standard Time,
writes:

What can I use for transmitting and receiving via a transceiver? ==================================
Pretend the transmitter and receiver are a wire. Use the SCI. ------
Yahoo! Groups Links

a.. To



In a message dated 3/17/05 7:25:50 A.M. Eastern Standard Time,
writes:

What can I use for transmitting and receiving via a transceiver? ==================================
Pretend the transmitter and receiver are a wire. Use the SCI.

===================================
The hint is the last 3 letters


MISO, MOSI, SS, SCK, TXD0, RXDO ??

do i need TXD0 and RXD0??
George Gogos
Undergraduate
BACHELOR OF ENGINEERING(Computronics/Electronics)
Deakin University, Australia ----- Original Message -----
From:
To:
Sent: Thursday, March 17, 2005 11:48 PM
Subject: Re: [68HC12] What function/pins to use for a transceiver??
In a message dated 3/17/05 7:25:50 A.M. Eastern Standard Time,
writes:

What can I use for transmitting and receiving via a transceiver? ==================================
Pretend the transmitter and receiver are a wire. Use the SCI.

===================================
The hint is the last 3 letters ------
Yahoo! Groups Links

a.. To



In a message dated 3/17/05 8:12:24 A.M. Eastern Standard Time,
writes: MISO, MOSI, SS, SCK, TXD0, RXDO ??

do i need TXD0 and RXD0??
George Gogos
Undergraduate
BACHELOR OF ENGINEERING(Computronics/Electronics)
Deakin University, Australia
What can I use for transmitting and receiving via a transceiver? ==================================
Pretend the transmitter and receiver are a wire. Use the SCI.

George, you might graduate someday (I hope), but you'll never get rich
unless you dig just a little harder. Once again, do the letters SCI mean ANYTHING
to you? Do you think there is any reference at all to an SCI in any HC12
manual you might be able to download? Come back with a question like "I
initialized my sci for 115200 bits per second, 8 bits, no parity, but I'm missing
characters at the receiver... do I need to receive with interrupts enabled?" You
question is more like " How do I get From Orlando to Jacksonville?" Come
on... in the next message, lets have a small list of interfaces that might be
used for interprocessor communication, some of the pros and cons of each.... I
hinted that you should look into using the SCI.... but you might not want to
get into a discussion of which serial protocols work best over rf links yet...
just get 'send one char' and 'receive one char' working first.


well actually, I do want to know which serial transfer type is better over an RF link. Im sorry if my questions may seem a bit simplistic to you, but this is one time where I have a very close deadline, nextwednesday, so Im not really in a state to test out sending a character one by one to get used to it. If I know what type of comm is best for RF, then I look into that and figure it out myself within an afternoon.
George Gogos
Undergraduate
BACHELOR OF ENGINEERING(Computronics/Electronics)
Deakin University, Australia ----- Original Message -----
From:
To:
Sent: Friday, March 18, 2005 12:19 AM
Subject: Re: [68HC12] What function/pins to use for a transceiver??
In a message dated 3/17/05 8:12:24 A.M. Eastern Standard Time,
writes: MISO, MOSI, SS, SCK, TXD0, RXDO ??

do i need TXD0 and RXD0??
George Gogos
Undergraduate
BACHELOR OF ENGINEERING(Computronics/Electronics)
Deakin University, Australia
What can I use for transmitting and receiving via a transceiver? ==================================
Pretend the transmitter and receiver are a wire. Use the SCI.

George, you might graduate someday (I hope), but you'll never get rich
unless you dig just a little harder. Once again, do the letters SCI mean ANYTHING
to you? Do you think there is any reference at all to an SCI in any HC12
manual you might be able to download? Come back with a question like "I
initialized my sci for 115200 bits per second, 8 bits, no parity, but I'm missing
characters at the receiver... do I need to receive with interrupts enabled?" You
question is more like " How do I get From Orlando to Jacksonville?" Come
on... in the next message, lets have a small list of interfaces that might be
used for interprocessor communication, some of the pros and cons of each.... I
hinted that you should look into using the SCI.... but you might not want to
get into a discussion of which serial protocols work best over rf links yet...
just get 'send one char' and 'receive one char' working first.
------
Yahoo! Groups Links

a.. To


Yes,
Best bet is to use the TXD0 and RXD0 since you cannot send a synchronizing
clock, just timed data (i.e. 9600 baud, 8,n,1). Also the SCI (Serial
Communications Interface) has plenty of error checking and standard
communications a PC can understand built right in to allow for flexible
systems. It will be very easy for you to implement using these pins, because
there is a module in the uC that handles the sending and receiving
automatically once you have its registers properly set up. In fact the
receiver can sit there processing other things, and when data is finished
being received can interrupt the process to let you know there is data in
the receive register ready to be looked at.
I know these processors have a lot of features, and it is a lot to soak up
when your liver is getting abused in college ;-). Have fun with your
project; just don't ask us to write code for you, it is a fun learning
process, and you picked the right hardware to learn on IMHO.
-Mark W
_____

From: George (Bigpond) [mailto:]
Sent: Thursday, March 17, 2005 8:13 AM
To:
Subject: Re: [68HC12] What function/pins to use for a transceiver??
MISO, MOSI, SS, SCK, TXD0, RXDO ??

do i need TXD0 and RXD0??
George Gogos
Undergraduate
BACHELOR OF ENGINEERING(Computronics/Electronics)
Deakin University, Australia ----- Original Message -----
From:
To:
Sent: Thursday, March 17, 2005 11:48 PM
Subject: Re: [68HC12] What function/pins to use for a transceiver??
In a message dated 3/17/05 7:25:50 A.M. Eastern Standard Time,
writes:

What can I use for transmitting and receiving via a transceiver? ==================================
Pretend the transmitter and receiver are a wire. Use the SCI.

===================================
The hint is the last 3 letters ----
--
> Terms of Service.


I second that sentiment. A modest amount of RTFM is common courtesy for
this kind of email group.

> MISO, MOSI, SS, SCK, TXD0, RXDO ??




does TXD0 and RXD0 correspond to the SCI or anything, or is it as simple as using those two pins as if they were like a pin in port a or b, But theyre already configured as transmitting and receiving?

I dont need anything flash for transmitting, like parity check, etc (not at this stage anyway). The SCI has pins like MOSI, MISO, SS, SCK....so all those pins need to be used, when I only need pins for transmitting and receiving (really on one board, I only need a pin for Transmitting, and on the other board I only need a pin for receiving)

Cheers for your help buddy. George Gogos
Undergraduate
BACHELOR OF ENGINEERING(Computronics/Electronics)
Deakin University, Australia ----- Original Message -----
From: Mark Wyman
To:
Sent: Friday, March 18, 2005 12:32 AM
Subject: RE: [68HC12] What function/pins to use for a transceiver?? Yes,
Best bet is to use the TXD0 and RXD0 since you cannot send a synchronizing
clock, just timed data (i.e. 9600 baud, 8,n,1). Also the SCI (Serial
Communications Interface) has plenty of error checking and standard
communications a PC can understand built right in to allow for flexible
systems. It will be very easy for you to implement using these pins, because
there is a module in the uC that handles the sending and receiving
automatically once you have its registers properly set up. In fact the
receiver can sit there processing other things, and when data is finished
being received can interrupt the process to let you know there is data in
the receive register ready to be looked at.
I know these processors have a lot of features, and it is a lot to soak up
when your liver is getting abused in college ;-). Have fun with your
project; just don't ask us to write code for you, it is a fun learning
process, and you picked the right hardware to learn on IMHO.
-Mark W
_____

From: George (Bigpond) [mailto:]
Sent: Thursday, March 17, 2005 8:13 AM
To:
Subject: Re: [68HC12] What function/pins to use for a transceiver??
MISO, MOSI, SS, SCK, TXD0, RXDO ??

do i need TXD0 and RXD0??
George Gogos
Undergraduate
BACHELOR OF ENGINEERING(Computronics/Electronics)
Deakin University, Australia ----- Original Message -----
From:
To:
Sent: Thursday, March 17, 2005 11:48 PM
Subject: Re: [68HC12] What function/pins to use for a transceiver??
In a message dated 3/17/05 7:25:50 A.M. Eastern Standard Time,
writes:

What can I use for transmitting and receiving via a transceiver? ==================================
Pretend the transmitter and receiver are a wire. Use the SCI.

===================================
The hint is the last 3 letters ----
--
> Terms of Service.
------
Yahoo! Groups Links

a.. To