by Scott Dattalo
to sample a stream as fast as possible. For an arbitrary length (but constrained by the PIC's memory) arrary of bits, you can do something like: btfsc BIT_PORT,THE_BIT bsf byte0,0 btfsc BIT_PORT,THE_BIT bsf byte0,1 btfsc BIT_PORT,THE_BIT bsf byte0,2 btfsc BIT_PORT,THE_BIT bsf byte0,3 btfsc BIT_PORT,THE_BIT bsf byte0,4 btfsc BIT_PORT,THE_BIT bsf byte0,5 btfsc BIT_PORT,THE_BIT bsf byte0,6 btfsc BIT_PORT,THE_BIT bsf byte0,7 btfsc BIT_PORT,THE_BIT bsf byte1,0
etc, for byte1, byte2 This'll give 2-cycle sampling per bit. There's a way to improve this to 1-cycle resolution, but you're limited to 16 bits.
Dmitry Kiryashov [zews at AHA.RU] says:
...it will make all the port unusable for other purposes ;) Source is located in bit.0 for instance. tris.0 is input others for output. Probably will not work on very fast speed (Scenix?)rlf port,F ;do it 7 times rlf port,W ;get 8 samples into W rlf port,F ;do it 8 times ;will have one more 8 samples ;in carry,port.7..1
also: PIC Microcontoller Bit Math Method Shifting long strings of bits
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<A HREF="http://www.piclist.com/techref/microchip/sersamp.htm"> PIC Microcontoller IO Method High speed serial IO pin sampleing</A>
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