Re: [Libphidget-devel] libphidget newbie post...

[Jack S. <js...@ja...>]

I'm still adding the new protocol to the code, I hope to have a test
version checked in tonight, wasn't feeling good yesterday so didn't make
much progress.  

Yep, the input buffer has gone from 7 to 8 bytes.  Here is the protocol
that chester sent me:




PhidgetInterfaceKit 8.0 Protocol
For PhidgetInterfaceKit 8/8/8

-------------------------------------------------------------------

PhidgetInterfaceKit 8/8/8, 8.0 PID: 0x06C2
PhidgetInterfaceKit 8.0 Protocol
For PhidgetInterfaceKit 8/8/8

-------------------------------------------------------------------

PhidgetInterfaceKit 8/8/8, 8.0 PID: 0x06C2
VID: 0x0045

-------------------------------------------------------------------

Output Packet

Output Packet
Length: 4 Bytes

Byte 0 = m_output_value;
Byte 1 = 0
Byte 2 = 0
Byte 3 = 0

Outputs 1-8 map onto m_output_value bits 0-7; a set bit indicates a CMOS
high (+5V),
a clear bit indicates a CMOS low (gnd)

-------------------------------------------------------------------

Input Packet
Length: 8 Bytes

The current state of this PhidgetInterfaceKit is too large to fit into a
single packet.
So Bit 1 of Byte 0 indicates whether this is a Packet.0 or Packet.1

In the case of Packet.0 (!(Byte_0 & 0x01)), this is the assignments.

Input_State 0-7 map onto Byte 1, bits 0-7, as shown.
m_inputvalue = Data[1];

12-Bit Sensor values are constructed from the packet as described:
newSensor[0] = ((unsigned char)Data[2] + ((unsigned char)Data[3] & 0x0f)
*
256);
newSensor[1] = ((unsigned char)Data[4] + ((unsigned char)Data[3] & 0xf0)
*
16);
newSensor[2] = ((unsigned char)Data[5] + ((unsigned char)Data[6] & 0x0f)
*
256);
newSensor[3] = ((unsigned char)Data[7] + ((unsigned char)Data[6] & 0xf0)
*
16);


In the case of Packet.1 (Byte_0 & 0x01), this is the assignments.

Input_State 0-7 map onto Byte 1, bits 0-7, as shown.
m_inputvalue = Data[1];

12-Bit Sensor values are constructed from the packet as described:
newSensor[4] = ((unsigned char)Data[2] + ((unsigned char)Data[3] & 0x0f)
*
256) * 4;
newSensor[5] = ((unsigned char)Data[4] + ((unsigned char)Data[3] & 0xf0)
*
16) * 4;
newSensor[6] = ((unsigned char)Data[5] + ((unsigned char)Data[6] & 0x0f)
*
256) * 4;
newSensor[7] = ((unsigned char)Data[7] + ((unsigned char)Data[6] & 0xf0)
*
16) * 4;










On Sun, 2003-06-29 at 05:18, Tom Brown wrote:
> On Thu, 26 Jun 2003, Tom Brown wrote:
> 
> > 
> > sorry, missed some items that may be relevent... linux "dmesg" shows the
> > following:
> > 
> > usb.c: usbdevfs driver claimed interface caa63380
> > usb.c: ignoring set_interface for dev 9, iface 0, alt 0
> > usb.c: usbdevfs driver claimed interface caa63380
> > usb.c: ignoring set_interface for dev 9, iface 0, alt 0
> > usb_control/bulk_msg: timeout
> > usbdevfs: USBDEVFS_BULK failed dev 9 ep 0x81 len 7 ret -110
> 
> OK, I'm stuck. I can't get past the above. I've turned on all the
> debugging in libusb and it's just saying the same thing. There
> are some issues in the code (talking the endpoint 1 when it's
> really 0x81), but libusb is correcting it with |= 0x80 .... It 
> took me a while to figure out why the kernel was reporting 0x81 
> when 0x01 was being specified. I added a usb_resetep after the 
> timeout, without it my mouse was locking up... which is _really_
> wierd hhmm, maybe that is the problem... (I don't think so, the
> absence or presence of hid and friends doesn't seem to be
> relevent when things are working)
> 
> OK, after FAR too much messing around, it seems the buffer
> lengths have to match the USB packet sizes perfectly... changing
> the buffer from 7 to 8 chars in phidgetInterfaceKit488Read (which
> I've hijacked) makes the code run... yeah! (I had already a 14 or
> 16 byte buffer...)
> 
>    enum ELPError phidgetInterfaceKit488Read
>    {
>       // char buffer[7];
> 	 char buffer[8];
> 
> ... that's _definately_ enough for tonight... (3am... yuck)
> 	 
> 
> 
> 
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-- 
Jack Strohm <js...@ja...>