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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

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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. [Non-text portions of this message have been removed]

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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. [Non-text portions of this message have been removed] Yahoo! Groups Sponsor ADVERTISEMENT ------------------------------------------------------------------------------ Yahoo! Groups Links a.. To [Non-text portions of this message have been removed]

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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 [Non-text portions of this message have been removed]

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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 [Non-text portions of this message have been removed] Yahoo! Groups Sponsor ADVERTISEMENT ------------------------------------------------------------------------------ Yahoo! Groups Links a.. To [Non-text portions of this message have been removed]

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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. [Non-text portions of this message have been removed]

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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. [Non-text portions of this message have been removed] Yahoo! Groups Sponsor ADVERTISEMENT ------------------------------------------------------------------------------ Yahoo! Groups Links a.. To [Non-text portions of this message have been removed]

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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 [Non-text portions of this message have been removed] Yahoo! Groups Sponsor ADVERTISEMENT ---------------------------------------------------------------------------- -- > Terms of Service. [Non-text portions of this message have been removed]

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I second that sentiment. A modest amount of RTFM is common courtesy for this kind of email group. > MISO, MOSI, SS, SCK, TXD0, RXDO ??

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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 [Non-text portions of this message have been removed] Yahoo! Groups Sponsor ADVERTISEMENT ---------------------------------------------------------------------------- -- > Terms of Service. [Non-text portions of this message have been removed] Yahoo! Groups Sponsor ADVERTISEMENT ------------------------------------------------------------------------------ Yahoo! Groups Links a.. To [Non-text portions of this message have been removed]

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You guys are extremely polite and must have nerves made of steel. RTFM RTFM RTFM ... RTFFFFM >:-I Edward ----- Original Message ----- From: <> To: <> Sent: Thursday, March 17, 2005 3:32 PM Subject: Re: [68HC12] What function/pins to use for a transceiver?? > > I second that sentiment. A modest amount of RTFM is common courtesy for > this kind of email group. > >> MISO, MOSI, SS, SCK, TXD0, RXDO ??

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Also, I dont really appreciate sarcasm regarding when I graduate (you hope????) Best to leave such sarcasm at the front door, true? Im sure you would know a fair bit about HCS12's, but power trips seem to be a specialty. 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. [Non-text portions of this message have been removed] Yahoo! Groups Sponsor ADVERTISEMENT ------------------------------------------------------------------------------ Yahoo! Groups Links a.. To [Non-text portions of this message have been removed]

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In a message sent Thursday March 17 2005 1.19 PM (GMT) Bob Garner wrote: - > 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. I do agree with Bob and I was tempted to post something earlier on the subject. I suspect that every person on this list (and there are more than a thousand) struggled on their own using a chip, a PC, and the principle of RTFM to get to grips with their chosen processor. I have supported many young people and they have all, without exception, gone through a sometimes steep and difficult learning curve, but IMHO it is the only way. I know re-inventing the wheel is not a good thing, but developing code to drive an LCD is a good learning base. I think it is very wrong for a beginner to use someone elses code - you will _never_ learn that way. In your case, George your supervisor may have provided too little time, but you might also be a typical student who has left everything to the last minute. Michael Elphick

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Guys, How old are you? Excuse me If I dont have the experience you all have, but in 16, got myself at uni at this age, doing my engineering project already, and have a very small window of time to do all this in, so I apologise if my questions seem a little basic to you.......its because I have RTFFM and am still stuck on a few things, as unlike all of you, I DO NOT KNOW THE HCS12 INSIDE OUT! Im sure you can understand this, and instead of replying back like its some sort of flaming session, just dont reply....... George Gogos Undergraduate BACHELOR OF ENGINEERING(Computronics/Electronics) Deakin University, Australia ----- Original Message ----- From: Edward Karpicz To: Sent: Friday, March 18, 2005 12:40 AM Subject: Re: [68HC12] What function/pins to use for a transceiver?? You guys are extremely polite and must have nerves made of steel. RTFM RTFM RTFM ... RTFFFFM >:-I Edward ----- Original Message ----- From: <> To: <> Sent: Thursday, March 17, 2005 3:32 PM Subject: Re: [68HC12] What function/pins to use for a transceiver?? > > I second that sentiment. A modest amount of RTFM is common courtesy for > this kind of email group. > >> MISO, MOSI, SS, SCK, TXD0, RXDO ?? Yahoo! Groups Sponsor ADVERTISEMENT ------------------------------------------------------------------------------ Yahoo! Groups Links a.. To [Non-text portions of this message have been removed]

Re[2]: [68HC12] What function/pins to use for a transceiver??


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George... the serial communication interface uart is the SCI... the SPI is the syncrounous peripheral interface.. thats the one that uses miso mosi and sck..... get the source to a SIMPLE comm program and compile it... test it by sending chars to hyperterminal thru an rs232 cable... when this works, hook it to the rf transmitter and receiver [Non-text portions of this message have been removed]

Re: What function/pins to use for a transceiver??


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Sorry George! I had no idea you were a young genius! Why didn't you tell us sooner? I'm 62, if you want to know, and almost (but not quite) burnt out! Michael Elphick

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<big snip> It is with some trepidation that I join this thread but --- There is a bit more to it than just hooking up arbitrary signals to the modulation port of an RF transceiver and expecting the identical modulation to come out the other end. George has some more reading to do -- 1. What are the characteristics of the modulation port?? What is its bandwidth? Does that bandwidth extend to DC? 2. It may be more simple to ask, "Was this device _designed_ for data transmission? If so, what data formats does it support? What clock speeds? The answers to the above questions will tell George whether he can simply hook this thing up to a data port on an MCU or whether he has to include a modem in the interface to convert the signal format. It should be noted that direction connection to an SCI or SPI port will require that the Tx bandwidth extend to or at least approach DC. The upper end of the modulation pass band will determine the maximum data rate that he can support. This is going require that George do even more reading and report back to us with some technical details. Best wishes, Bob Smith --- Avoid computer viruses, Practice safe hex --- -- Specializing in small, cost effective embedded control systems -- http://www.smithmachineworks.com/embedprod.html Robert L. (Bob) Smith Smith Machine Works, Inc. 9900 Lumlay Road Richmond, VA 23236 804/745-2608

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Hi George, Usually the pins on these processors can be configured for I/O use and/or dedicated module use using configuration registers. When set in I/O mode, the pins have to be manually polled or set using reads and writes to the specific pins. When set to the SCI module for example (UART), you can write say 0xAF to the send register, and the module in the uC will take over from there, toggle the pins, and set appropriate flags. In this mode you don't have to even touch the pins in code, which is nice. For example a very simplistic look at things: 1. Set port pins to be used for the SCI rather than I/O. 2. Set up interrupt vectors if needed (start without interrupts, easier to tackle starting out using polling) 3. Set baud and timing registers to get required rates, prefer something slow before ramping up, it helps when using scope to debug. 4. Set or clear interrupt masks if needed (you can start by polling flags, then move to interrupts) 5. Write data to the TXD register when FIFO empty flag is clear/set. The module does all of the work in toggling the output pins. 6. Read data from the RXD register when ready flag is set or within interrupt. The module does all of the work of shifting the data into the register for you and setting flags. Go ahead and get started, nothing will teach you faster than jumping in head-over-heels. Just make sure you have a few diagnostic LEDs attached to let you know when certain events are occurring such as "pulse", "RX event", "TX Event", etc. Makes things fast. Just keep that book cracked open to the SCI section. I am no genius, but I started off at a young age playing with electronics and learned much on my own due to my love of making nifty projects. uCs were crappy then and didn't have the functions that modern uCs have today. Be prepared to be spoiled at how nice these are to work with these days. Oh, see the link under my name for some good products to learn from. -Mark Wyman Engineering Manager Avcom/Ramsey Tech. 590 Fishers Station Drive Victor, NY 14564 (585) 924-4560 <mailto:> <http://www.ramseyelectronics.com> http://www.ramseyelectronics.com _____ From: George (Bigpond) [mailto:] Sent: Thursday, March 17, 2005 8:37 AM To: Subject: Re: [68HC12] What function/pins to use for a transceiver?? 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 [Non-text portions of this message have been removed] Yahoo! Groups Sponsor ADVERTISEMENT ---------------------------------------------------------------------------- -- > Terms of Service. [Non-text portions of this message have been removed] Yahoo! Groups Sponsor ADVERTISEMENT ---------------------------------------------------------------------------- -- > Terms of Service. [Non-text portions of this message have been removed]

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Hi George, Don't forget that most chip vendors (not only Freescale) offer quite good manuals. And this RF-NRF401 quite possibly includes a chip which is very well documented. If you search for it (e.x. Google), you get your hands to the application notes made by the manufacturer of nRF401. These mention quite clearly what aspects of UART (SCI) must be considered that the transmission could occur. I read some of these (for curiosity) and I suggest that you read the data scrambling part very thoroughly. But, before you try to test a transmission using wireless links, the wired part (SCI) should work properly between these two E128s. As mentioned before in this thread, I don't give you straight answers because you have to learn to believe that you can find the necessary information while looking at the static www sites and not to trust that a person can be there for you, filtering and delivering information. Jani > > > 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

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> 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) Please stop flooding this group with misinformation. SCI does NOT have the above mentionned pins. You are confusing SPI with SCI. John

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Guys, Sorry if I provoked you to react to this thread instead of simply ignoring it. George, Even people over 60 are using this list. Why? They are learning. They don't stop learning and RTFManuals. Simple (at first glance) task of choosing simple external ADC chip with good availability ant required specs may turn into reading ~100 of datasheets from various manufacturers. How proplems are solved, new chips, some specifics of HCS12 modules, erratas, compilers, assemblers, part unsecuring, insights etc - all this adds into great value for engineer, and all this is available here for free. It's not paid service, neither it's a robot/database. _People_ are keeping it up and runnig. Don't hurt them if you want to keep using this service, don't foul the well! The first suggestion you got was _perfect_ answer to your question. You ignored the answer, you ignored further answers and IMO poisoned the wish to help. I hope you will change for better and come back to ask and _to listen_. Regards, Edward -----Original Message----- From: George (Bigpond) [mailto:] Sent: Thursday, March 17, 2005 8:51 AM To: Subject: Re: [68HC12] What function/pins to use for a transceiver?? Guys, How old are you? Excuse me If I dont have the experience you all have, but in 16, got myself at uni at this age, doing my engineering project already, and have a very small window of time to do all this in, so I apologise if my questions seem a little basic to you.......its because I have RTFFM and am still stuck on a few things, as unlike all of you, I DO NOT KNOW THE HCS12 INSIDE OUT! Im sure you can understand this, and instead of replying back like its some sort of flaming session, just dont reply....... George Gogos Undergraduate BACHELOR OF ENGINEERING(Computronics/Electronics) Deakin University, Australia ----- Original Message ----- From: Edward Karpicz To: Sent: Friday, March 18, 2005 12:40 AM Subject: Re: [68HC12] What function/pins to use for a transceiver?? You guys are extremely polite and must have nerves made of steel. RTFM RTFM RTFM ... RTFFFFM >:-I Edward ----- Original Message ----- From: <> To: <> Sent: Thursday, March 17, 2005 3:32 PM Subject: Re: [68HC12] What function/pins to use for a transceiver?? > > I second that sentiment. A modest amount of RTFM is common courtesy for > this kind of email group. > >> MISO, MOSI, SS, SCK, TXD0, RXDO ??

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George, as some else suggested start with MCU to MCU comms first, getting it working. Second add the wireless stuff inbetween. Test and go from there. Advice: Based on experince from what others here are doing, UART/SCI may not work well for wireless, developing a coding algorithim and bit bashing out a pin may be more suitable. (error correction!) Either way, get two MCUs to communicate by wire first before implemeneting the wireless stuff. Others you will be looking for that damm in needle in a very large haystack. Regards Sasha > -----Original Message----- > From: Mihai Vancea [mailto:] > Sent: Friday, 18 March 2005 8:24 AM > To: > Subject: Re: [68HC12] What function/pins to use for a transceiver?? > > Hi George > > If you look at http://www.nvlsi.no you will find the data sheet of the > nRF401. > > Also there is an application note that describes methods of how to > implement software routines to transfer data from one > microcontroller to > another via a nRF chip . > > You will find there that UART communication beetween nRF and micro is > recomandated only at low rate. > > You might also think at pin toogle for interface. > > Mihai Vancea > > > > Hi George, > > > > Don't forget that most chip vendors (not only Freescale) > offer quite > > good manuals. And this RF-NRF401 quite possibly includes a > chip which is > > very well documented. If you search for it (e.x. Google), > you get your > > hands to the application notes made by the manufacturer of > nRF401. These > > mention quite clearly what aspects of UART (SCI) must be > considered that > > the transmission could occur. I read some of these (for > curiosity) and I > > suggest that you read the data scrambling part very thoroughly. > > > > But, before you try to test a transmission using wireless > links, the > > wired part (SCI) should work properly between these two E128s. > > > > As mentioned before in this thread, I don't give you > straight answers > > because you have to learn to believe that you can find the > necessary > > information while looking at the static www sites and not > to trust that > > a person can be there for you, filtering and delivering > information. > > > > Jani > > > > > > > > > > > > > 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 > > > > > > > > > > > > Yahoo! Groups Sponsor ADVERTISEMENT > > > > Yahoo! Groups Links > > To > > > Yahoo! Groups Links

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