Is it possible to create a data stream 8 bytes long every 100mS, bytes are 10mS....

[Changster]

Hi all,
is it possible to create with a 08M2 a data stream that is a 8 byte message once every 100mS (ten times a second).
The 8 byte message consist of 7 data bytes, followed by 1 check byte. Bytes are transmitted 10mS apart, with a 30mS gap between message repeat.
Is this possible within the Picaxe?
regards mark

 

[Buzby]

What BAUD rate ?

 

[Changster]

The BAUD rate is 7812

 

[g6ejd]

If you want to TX 10 times-sec then that's a byte budget of 100mS - the 10mS inter-byte gap = 90mS per-byte.

Your total number of bits is 10 (1+7+1+1), assuming an asynchronous transmission, so your buad rate is 90mS/10 bits = 0.9mS / bit or 111 baud.

You could run the serial out routine (not the in-built Picaxe routine, so you'd need to code it yourself) to run at 7812 baud, giving you plenty of time left in your inter-byte budget.

 

[Buzby]

That's a bit of a strange BAUD rate, but hersout will generate it easily.

Does the PICAXE need to be doing anything else other than just generating a stream of bytes ?

 

[nick12ab]

You can use this to calculate the hserout command for your data stream.

 

[Buzby]

Hi Nick,

That's exactly what I used to ensure 7812 was possible.

Your calculator is a tool I use all the time, so I'd like to give a big thanks to you for developing it.

Cheers,

Buzby

 

[Changster]

Cheers for all the replies..

i'll get coding to replicate the ECU signal of a Suzuki GSXR motorcycle so i can change the temp gauge and remove the 'chec' from the display in the speedo unit.

regards mark

 

[nick12ab]

i'll get coding to replicate the ECU signal of a Suzuki GSXR motorcycle so i can change the temp gauge and remove the 'chec' from the display in the speedo unit.

While it is still part of a motorcycle that's being used?

 

[Paix]

A performance motorcycle too, so more than capable of glitching at speed. Was it a decade or two ago when a Kawasaki super bike used to suffer with carb icing under certain conditions, engine stutters, back wheel locks momentarily and it all ends in tears as traction is lost at speed. It was all new ground then, just like aquaplaning is common knowledge to all today, but began to be recognised 40+ years ago with aircraft during landing.

 

[Changster]

While it is still part of a motorcycle that's being used?

Not while its being used on a bike, its so the dash can be used in a kit car with a different management system.