On Wed, Jun 29, 2011 at 11:00 AM, Vishwanath Saragadam
<vishwa....@gmail.com> wrote:
> DLL version: 0.1.12.1
> Driver version: 0.1.12.1
Please update to the latest version, which is 1.2.4.0 for the
release version (and 1.2.4.6 for snapshot version).
> bus/device idVendor/idProduct
> bus-0/\\.\libusb0-0001--0x04d8-0x0204 04D8/0204
> - Manufacturer : Microchip Technology Inc.
> - Product : Microchip Libusb Example Device
Are you using the stock Microchip libusb example? If yes,
then you should already know the protocol and they
have already a libusb based example. Read the codes
carefully and then port it to pyusb.
Eg:
1)toggle LED.
char OutputPacketBuffer[64];
//Allocate a memory buffer which will contain data to send to the USB device
OutputPacketBuffer[0] = 0x80;
//0x80 is the "Toggle LED(s)" command in the firmware
//For simplicity, we will leave the rest of the buffer uninitialized,
but you could put rea
//data in it if you like.
//Writes data to a bulk endpoint. The Function call will send out 64
bytes to the USB Device.
if(usb_bulk_write(MyLibusbDeviceHandle, 0x01,
&OutputPacketBuffer[0], 64, 5000) != 64)
{
return;
}
2) read push button status
char OutputPacketBuffer[64];
//Allocate a memory buffer which will contain data to send to the USB device
char InputPacketBuffer[64];
//Allocate a memory buffer for the data which we will read from the USB device
OutputPacketBuffer[0] = 0x81;
//0x81 is the "Get Pushbutton State" command in the firmware
//For simplicity, we will leave the rest of the buffer uninitialized,
but you could put real
//data in it if you like.
//To get the pushbutton state, first, we send a packet with our "Get
Pushbutton State" command in it.
//The following call to usb_bulk_write() sends 64 bytes of data to
the USB device.
if(usb_bulk_write(MyLibusbDeviceHandle, 0x01, &OutputPacketBuffer[0],
64, 5000) != 64)
{
return;
}
//Now get the response packet from the firmware.
//The following call to usb_bulk_read() retrieves 64 bytes of data
from the USB device.
if(usb_bulk_read(MyLibusbDeviceHandle, 0x81, &InputPacketBuffer[0],
64, 5000) != 64)
{
return;
}
//InputPacketBuffer[0] is an echo back of the command.
//InputPacketBuffer[1] contains the I/O port pin value for the pushbutton.
if (InputPacketBuffer[1] == 0x01)
{
StateLabel->Text = "State: Not Pressed";
}
else
{
StateLabel->Text = "State: Pressed";
}
If you have changed the firmware, then you should following your own
firmware protocol and not to just write any codes and expect it to work.
--
Xiaofan
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