Thread: Beginner!!! Please help

Originally Posted by matsp

I would probably write a function that takes the payload and length, along with a buffer (and perhaps buffer-size so you can DETECT that your payload and framing doesn't fit, if the buffer isn't big enough).

Then just fill in the start of the buffer, use a loop to copy the payload, and then mark the end with a 'P'. Something like this would be the calling code:

Code:

   char buffer[256];

   const char *payload = "abcd";
   BuildFrame(payload, strlen(payload), buffer, sizeof(buffer));

I'm leaving it to you to define the function itself.

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Mats

Ok, Thanks.

Originally Posted by matsp

http://www.nxp.com/acrobat/datasheets/SC18IM700_2.pdf

It seems like writing an 'O' followed by the relevant data for the GPIO port will do the job. Of course, you may have to configure the GPIO port first so that the pin is an output. You need to set PortConf0 or PortConf1 to get that set right.

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Mats

Yes, I do know whatever you have mentioned. I need to configure GPIO1 as an output (push pull output config) and then I need to set it to a logic zero.

I am stuck up at defining PortConf1 and the actual pin. How do I define this in C?

Originally Posted by matsp

You need to set it up according to the table in section 9.2.2, by writitng the corresponding bits in the PortConf1. To do that, you need to use the 'W' command.

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Mats

Oh! Thanks. When I am using the 'W' command (section 7.1.3), How do I name the inetrnal register? I mean what sort of identification can I give the controller to say that it is PortConf1?(Section 9.1, register summary)

Originally Posted by matsp

The description is a big vague, but I expect you send the value 0x02, then the value you want to set the register to, and then a 'P' to end the message.

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Mats

Ya, even I saw the description and I found it a bit vague. I will try doing that.

Thanks for bearing with me.

Originally Posted by reemaambekar

Ya, even I saw the description and I found it a bit vague. I will try doing that.

Thanks for bearing with me.

It worked . Thanks .

Originally Posted by reemaambekar

It worked . Thanks .

Hello !!!!

Well, it doesn't seem to work. Is there any other way if defining the register in C?

Originally Posted by matsp

Well, in this case, "register" is just a number you send to the other processor, so you can of course use #define, const or enum to declare a constant equivalent of the register number. That will make it more symbolic, but it will not change what is actually sent out from your processor.

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Mats

Do u mean I could use something like '#define PortConfig1 0x02'?

Originally Posted by matsp

Yes. But that will just make it easier to read the code and understand that you are writing to PortConfig1 (which is a good thing). If sending 2 to the device isn't working, then defining PortConfg1 as 2 isn't going to change that.

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Mats

Ok, thanks. Well I figured out a while before that the function 'ASC1_vSendData()' doesnt send anything other than the ASCII characters. I used the ASC0 port to display contents of the array on the hyperterminal. I sent an array

Code:

{'W',0x02,0x08,'P'}

but it just displays WP.