Serin on X2

[Jeremy Leach]

I'm assuming you can use any pin for serin on an X2, and that new constants are available for the baudrates ??? e.g ...

Serin B.3,T19200_64,b0

Is this correct? Thanks.

 

[SilentScreamer]

It looks correct to me and works in the simulator.

 

[Technical]

Yes, but at very clocks like 64Mhz some baud rates like 4800 are not available (PICAXE is going toooo fast!). Solution then is to just drop down to a slower speed.

 

[Jeremy Leach]

Thanks. Could you possibly clarify exactly what is/isn't available @64MHz on an X2? Basically I want my master to have a VERY curt conversation with my slave, so quicker the better

 

[eclectic]

@Jeremy

I've just tried two 28X2 3V @64 MHz each

#picaxe 28X2
let dirsB = %11111111
let adcsetup = 0

setfreq eM64

main:
Serin B.3,T19200_64,b0
sertxd (#b0,"  ")
goto main


#rem

#picaxe 28x2 ;sender
let dirsB = %11111111
let adcsetup = 0

setfreq em64

main:
for b0 = 0 to 255

serout B.7,T19200_64,(b0)

pause 500
next
goto main

e

 

[hippy]

Interesting you got 76800 baud working on the PC - It's not a standard baud rate and some PC's do not accept that. Would I be right in assuming COM4 goes via a USB-to-serial ?

 

[eclectic]

Interesting you got 76800 baud working on the PC - It's not a standard baud rate and some PC's do not accept that. Would I be right in assuming COM4 goes via a USB-to-serial ?

Yes: AXE027 on Com4, using your terminal prog.

e

 

[eclectic]

Addition to post#7

Re-ran the program on Com4.

Then pressed the Com1 "button"


Hmmm?

e

 

[hippy]

Thanks. Could you possibly clarify exactly what is/isn't available @64MHz on an X2?

There are four standard baud rates for all X2 SERIN / SEROUT at default 8MHz operating speed - 1200, 2400, 4800 and 9600 baud. Those scale up and down according to actual frequency used ...

 4MHz    8MHz     16MHz     32MHz     64MHz

 600_4  1200_8   2400_16   4800_32   9600_64
1200_4  2400_8   4800_16   9600_32  19200_64
2400_4  4800_8   9600_16  19200_32  38400_64
4800_4  9600_8  19200_16  38400_32  76800_64

Hmmm?

Windows asks the device drivers if a particular baud rate is supported or not and that's the message one gets when it isn't. That's common with hardware COM ports ( though some may accept it ). What baud rates are accepted depends on hardware, Windows OS variant and device drivers.

 

[Jeremy Leach]

Thanks very much eclectic, and Hippy for those answers Looks good to me ...