shift right problems

[JerryR]

Hi: any help is appreciated, seems so simple, but shift right doesn't seem to work. Compiler is 3.249 PCWH. Code follows

TestBitIn is confirmed to be a one. After shift_right Preamble_In still 0x00. Continued shift_rights -- Preamble_In still 0x00.

What's up?


HDLC_In()
{
int8 Preamble_In;
int8 Rx_Data; //holds shifted in rx data
int8 Index,BitPos,Ones_Count;
int1 Good_Preamble; //good preamble flag
int1 TestBitIn;


Preamble_In = 0x0000;
Good_Preamble = False;
Ones_Count= 0;
output_bit(Md_RxEn, 1);
TestBitIn = 0;
Wt_RxSync();

While (!Good_Preamble)
{
TestBitIn = input (Md_RxClDta);
shift_right (Preamble_In, 1, TestBitIn);
if (Preamble_In == MSK_Preamble) Good_Preamble = True;
else
Wt_RxSync(); }
}

[Bob Sacamano]

shift_right (address, bytes, value)

address is a location in RAM--a pointer to or address of a variable. You need:

[JerryR]

Bob:

Thanks for the quick reply. Yes, caught my mistake just after the initial post.

Thanks also for the steer on posting manners. Will keep that in mind.

All the best,
JerryR