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06.11.2001 at 02:42AM PDT, ID: 20133039

	[x] Attachment Details

[x]

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5.0

Experts Question

Asked by cvallabhaneni in C Programming Language

In my communication protocl application a want to use a modulus 128 operation which is as follows

I have a variable 'sequence_no' which comes from communication packet.

I have to verify in my function whether the 'sequence_no' is previously received or not.

For this operation here is an algorithm

unsigned char current_no; // This my applications global variable

if(sequence_no<=(current_no-1))
// packet is already received
else if( sequence_no >= current_no)
{
// receive packet
current_no ++;
current_no %= 128; // I have to round off to '0' when number equals 128
}
else
// invalid packet(misalignment)

The above works fine for 0-127

My problem is, when the 'sequence_no = 127' if i receive the same packet twice for the first time it validates TRUE,
but for the second time the current_no rounds off to '0' and the condition "sequence_no<=(current_no-1)" fails.

Can any one suggest a solution to above?
If there is any difficuly in understanding question please comment..

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Keywords: Experts Question

	Title
1	converting unsigned char ** to unsig…
2	Convert char to wchar_t
3	Best way to round a number
4	rounding algorithm
5	converting input unsigned char * to c…
6	Space optimisation algorithm

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20081112-EE-VQP-43

Experts Question

Asked by cvallabhaneni in C Programming Language

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