Px and scale number

TJHJ

So I am new to the basic stamp series, mainly plan on using it to check devices before attempting to use them on the Prop chip. So I purchased the Bs2Px chip. All of the examples have a scale number for each Bs2 clock speed, but so far none have one for the Px. Is there a common number I could use in the scale component of the demo code to make it compatible with the Px chip?

Thank you for your time,
TJ

stamptrol

On the Parallax web store, you can compare the various Stamp modules.

A quick check shows the standard BS2 to execute 4000 instructions per sec, the BS2sx about 10000
and the BS2px about 19000. Since the examples give scale numbers for the other Stamps,you should be able to make a good estimate of what scale number to use with the Propellor to approximate the BS2px.

Cheers,

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Tom Sisk

http://www.siskconsult.com
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TJHJ

I guess I explained that wrong, I am sorry Tom, but thank you for your time.

So under the Memsic 2125 Dual-axis Accelerometer BS2 sample code it contains the following to account for the timing/clock speed difference of each chip.

#SELECT $STAMP
  #CASE BS2, BS2E
    Scale       CON     $200                    ' 2.0 us per unit
  #CASE BS2SX
    Scale       CON     $0CC                    ' 0.8 us per unit
  #CASE BS2P
    Scale       CON     $0C0                    ' 0.75 us per unit
  #CASE BS2PE
    Scale       CON     $1E1                    ' 1.88 us per unit
#ENDSELECT

but the P has a different speed than the Px. There are a few example codes that use similar control to account for the different clock speeds.

Does anyone know what the approiate scale would be for the Px chip?

Thank you.

Mike Green

The BS2px Brief (www.parallax.com/Portals/0/Downloads/docs/prod/stamps/BASICStamp2px.pdf) gives the timing information for the various statements in Stamp Basic. This link is from the BS2px product page in the Parallax web store.