[Tinyos-help] About TOSH_READ_RADIO_CCA_PIN()

[Min Guo]

I am not sure where is this function. Where did you find that? Based
on the cc2420 datasheet "CCA is valid when the receiver has been
enabled for at least 8 symbol periods." Thus one can read the CCA
signal from the CCA pin 8 symbol periods (128 us) after enabling
reception.


2008/6/13 정관희 <khjeong at gist.ac.kr>:
> I use cc2420 radio chip. So, I know it has a CCA pin.
> What i'm saying, TOSH_READ_RADIO_CCA_PIN() checks whether CCA pin is
> available or not.
> That is, I want to confirm how to run this function through its code.
> how do I do?
>
> --- Original Message ---
> From : "Min Guo"<min.guomin at gmail.com>
> To : "JeongKwanhee"<khjeong at gist.ac.kr>
> Date : 2008/06/13 금요일 오후 8:44:05
> Subject : Re: [Tinyos-help] About TOSH_READ_RADIO_CCA_PIN()
>
> Which radio do you use? On cc2420 there is a CCA pin available. CCA
> indicates whether the channel is clear or with energy, and surely the
> neighborhood nodes affects if they are communicating in the same
> channel.
>
> On Fri, Jun 13, 2008 at 10:34 AM, JeongKwanhee <khjeong at gist.ac.kr> wrote:
>> Hello, all members of TinyOS
>>
>>
>>
>> In general TinyOS, TOSH_READ_RADIO_CCA_PIN() is able to use some function
>> if
>> we want to check the state of channel.
>>
>> But, I don't know how to calculate whether channel is clear or not.
>>
>>
>>
>> I just think that it compares to rssi and cca.
>>
>> But, in this case, I think it does not consider the interference of
>> adjacent
>> nodes.
>>
>> For example, SINR.
>>
>>
>>
>> So, I want to check TOSH_READ_RADIO_CCA_PIN() function, and then to fix
>> this
>> function.
>>
>>
>>
>> If you know about this, please contact to me. Thank you.
>>
>>
>>
>> _________________________________________________________
>>
>> Kwanhee Jeong
>>
>> Tel: +82-62-970-3147
>> Cell: +82-16-387-6870
>> Fax: +82-62-970-2291
>>
>> _________________________________________________________
>>
>>
>>
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