A faster pulsin

SamTheMan

The pulse in command in the SX is slow (the resolution is 10us)
How can I go as fast as 0.8us? just like the BS/SX

JonnyMac

Easy... have a look "under the hood" at the generated assembly code and use it to create a custom function (I've been doing this a lot lately). Remember, the BS2sx has a fixed 50 MHz resonator and SX/B has to generate code that can work down to 4 MHz and lower, hence the decision to use 10 uS for PULSIN resolution.

Bean

What Jon said... Also initially SX/B only had byte variables, so the pulsin had to have low resolution to avoid overflowing the byte variables when reading servo pulses.

cnt = 0
DO ' Wait for pin to go low
LOOP UNTIL inPin = 0
DO ' Wait for pin to go high
LOOP UNTIL inPin = 1
DO ' count until pin goes low again
  PAUSEUS 0.8 ' You'll have to adjust this value to account for instruction time
  INC cnt
  IF cnt = 0 THEN EXIT
LOOP UNTIL inPin = 0
' cnt now holds the desired value

Bean.



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SamTheMan

it works.
Thank you very much