Wired remote for Alpine

[fratello]

I made some changes ....

VolUp:
    GOSUB SendPreAmble
    ' 01010111 10101010 1
    ' Each individual byte reversed
    OutBuffer[0] = %11101010
    OutBuffer[1] = %01010101  ; modified
    OutBuffer[2] = %00000001
    
    BitsToSend = 17
    
    GOSUB SendBits
    GOSUB SendPostAmble
    
    OutBuffer[0] = %11101010
    OutBuffer[1] = %01010101  ; modified
    OutBuffer[2] = %00000001
    
        BitsToSend = 17
    
    GOSUB SendBits
    GOSUB SendPostAmble
    
    OutBuffer[0] = %11101010
    OutBuffer[1] = %01010101  ; modified
    OutBuffer[2] = %00000001
    
        BitsToSend = 17
    
    GOSUB SendBits
    GOSUB SendFinalAmble    
RETURN

and added this :

SendFinalAmble:
' 01111111 11111111 11111111 11111111 11111111 11111111 11111111 111111
    OutBuffer[0] = %11111110
    OutBuffer[1] = %11111111
    OutBuffer[2] = %11111111
    OutBuffer[3] = %11111111
    OutBuffer[4] = %11111111
    OutBuffer[5] = %11111111
    OutBuffer[6] = %11111111
    OutBuffer[7] = %11111111
    
    BitsToSend = 54
    
    GOSUB SendBits
RETURN

...and in Proteus look fine !

[HenrikOlsson]

Are you sure you actually have to send the command three times? Personally I have NO knowlage about these things but I would've guessed (if this is captured from a remote for example) that it just kept repeating the command and postamble untill the button was released and then issued the 'FinalAmble'. So perhaps Preamble, Command, FinalAmble is all you actually need? Oh well, like I said, I have no idea really - just guessing, you'll figure it out.

/Henrik.

[fratello]

My informations are from one user of AVFORUMS.COM.
"Every time you send the device and command codes, you should repeat the device and command codes three times, but pause between them for about 20ms." I think it's true...

[fratello]

Still beta-testing ...
I wonder...It's one way to obtain EXACTLY 536.5 us ?!?

[HenrikOlsson]

Depends.... What's you oscillator speed? At 20Mhz an instruction cycles is 200ns so, in theory, doing something like

PauseUs 536
@ NOP
@ NOP

should get you pretty close (536.4us). If the timing is that critical then it's probably not going to work the way I wrote it since there will be "gaps" between the preamble, command, postamble etc. You'd need to build the complete message in a larger array and then send it but that gets a bit complicated due to the variation in length of the commands (they won't line up at even byte boundries).

/Henrik.

[fratello]

Thank You for support !
The oscillator is 4 MHz...

[HenrikOlsson]

Hi,
Well, at 4Mhz each instruction cycle is 1us so the smallest time possible to resolve at that speed is just that - 1us. I don't think I can come up with any way to get higher resolution without increasing the oscillator speed.

/Henrik.