From: John Morrison (jmorrison_at_ahc.net.au)
Date: 2002-03-10 05:46:05
Thanks I'll add that to the spec. If modularEEG and RS232EEG are the same
GREAT we'll be able to use the same class for each. Should save time!!
THANKS
John
> -----Original Message-----
> From: Joerg Hansmann [mailto:info_at_jhansmann.de]
> Sent: Sunday, 10 March 2002 11:48 AM
> To: buildcheapeeg_at_yahoogroups.com
> Subject: Re: [buildcheapeeg] Question for Hardware Guys
>
>
> Hi,
>
> ----- Original Message -----
> From: John Morrison <jmorrison_at_ahc.net.au>
> To: buildcheapeeg <buildcheapeeg_at_yahoogroups.com>
> Sent: Wednesday, March 06, 2002 5:20 PM
> Subject: [buildcheapeeg] Question for Hardware Guys
>
>
> > Just a (hopefully) Quick Question!
> >
> > What instructions can you give your hardware device
> > eg Set sampling rate
> > AND if you know what is the actual data sent over the RS232
> > eg MAYBE 02 03 04 :-)
>
>
> The modularEEG uses essentially the same firmware as the
> RS232EEG. At the moment it does not receive any commands.
> Sample rate is either 200Hz or 256Hz (depending on a #define
> at compile time).
> The datastream consists of frames sent with 57600 baud 1
> startbit, 1 stopbit,
> no parity:
>
> enhanced protocol (version 2):
>
> byte synch_1 // is always $a5
> byte synch_2 // is always $5a
> byte version // is 0x02 (tells the PC, which protocol is running)
> byte frame_counter // is 0x00 at startup. increment 1 for each
> data frame. wraparound 255->0
> byte ch1_high // bit pattern is 000000bb. bb are the 2 high bits
> of 10 bit AD-value
> byte ch1_low
> byte ch2_high // bit pattern is 000000bb. bb are the 2 high bits
> of 10 bit AD-value
> byte ch2_low
> byte ch3_high // bit pattern is 000000bb. bb are the 2 high bits
> of 10 bit AD-value
> byte ch3_low
> byte ch4_high // bit pattern is 000000bb. bb are the 2 high bits
> of 10 bit AD-value
> byte ch4_low
> byte ch5_high // bit pattern is 000000bb. bb are the 2 high bits
> of 10 bit AD-value
> byte ch5_low
> byte ch6_high // bit pattern is 000000bb. bb are the 2 high bits
> of 10 bit AD-value
> byte ch6_low
> byte switches // 1 byte digital inputs (PD2..PD5) in the lower 4 bits.
>
> all together 17 bytes per frame.
>
>
> Regards,
>
> Joerg
>
>
>
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