//--------------------------------------------------------------------------
// Set the 1-Wire Net line level. The values for new_level are
// as follows:
//
// 'portnum' - number 0 to MAX_PORTNUM-1. This number is provided to
// indicate the symbolic port number.
// 'new_level' - new level defined as
// MODE_NORMAL 0x00
// MODE_STRONG5 0x02
// MODE_PROGRAM 0x04 (not supported in this version)
// MODE_BREAK 0x08 (not supported in chip)
//
// Returns: current 1-Wire Net level
//
SMALLINT owLevel(int portnum, SMALLINT new_level)
{
SETUP_PACKET setup;
ULONG nOutput = 0;
// Turn off infinite strong pullup?
if ((new_level == MODE_NORMAL) && (USBLevel[portnum] == MODE_STRONG5))
{
if (DS2490HaltPulse(usbhnd[portnum]))
USBLevel[portnum] = MODE_NORMAL;
}
// Turn on infinite strong5 pullup?
else if ((new_level == MODE_STRONG5) && (USBLevel[portnum] == MODE_NORMAL))
{
// assume duration set to infinite during setup of device
// enable the pulse
setup.RequestTypeReservedBits = 0x40;
setup.Request = MODE_CMD;
setup.Value = MOD_PULSE_EN;
setup.Index = ENABLEPULSE_SPUE;
setup.Length = 0x00;
setup.DataOut = FALSE;
// call the driver
if (!DeviceIoControl(usbhnd[portnum],
DS2490_IOCTL_VENDOR,
&setup,
sizeof(SETUP_PACKET),
NULL,
0,
&nOutput,
NULL))
{
// failure
OWERROR(OWERROR_ADAPTER_ERROR);
AdapterRecover(portnum);
return USBLevel[portnum];
}
// start the pulse
setup.RequestTypeReservedBits = 0x40;
setup.Request = COMM_CMD;
setup.Value = COMM_PULSE | COMM_IM;
setup.Index = 0;
setup.Length = 0;
setup.DataOut = FALSE;
// call the driver
if (!DeviceIoControl(usbhnd[portnum],
DS2490_IOCTL_VENDOR,
&setup,
sizeof(SETUP_PACKET),
NULL,
0,
&nOutput,
NULL))
{
// failure
OWERROR(OWERROR_ADAPTER_ERROR);
AdapterRecover(portnum);
return USBLevel[portnum];
}
else
{
// success, read the result
USBLevel[portnum] = new_level;
return new_level;
}
}
// unsupported
else if (new_level != USBLevel[portnum])
{
OWERROR(OWERROR_FUNC_NOT_SUP);
return USBLevel[portnum];
}
// success, return the current level
return USBLevel[portnum];
}
//--------------------------------------------------------------------------
// Set the 1-Wire Net line level. The values for new_level are
// as follows:
//
// 'portnum' - number 0 to MAX_PORTNUM-1. This number is provided to
// indicate the symbolic port number.
// 'new_level' - new level defined as
// MODE_NORMAL 0x00
// MODE_STRONG5 0x02
// MODE_PROGRAM 0x04 (not supported in this version)
// MODE_BREAK 0x08 (not supported in chip)
//
// Returns: current 1-Wire Net level
//
SMALLINT owLevelUSB(int portnum, SMALLINT new_level)
{
SETUP_PACKET setup;
SMALLINT ret = 0;
// Turn off infinite strong pullup?
if ((new_level == MODE_NORMAL) && (USBLevel[portnum] == MODE_STRONG5))
{
if (DS2490HaltPulse(usb_dev_handle_list[portnum]))
USBLevel[portnum] = MODE_NORMAL;
}
// Turn on infinite strong5 pullup?
else if ((new_level == MODE_STRONG5) && (USBLevel[portnum] == MODE_NORMAL))
{
// assume duration set to infinite during setup of device
// enable the pulse
setup.RequestTypeReservedBits = 0x40;
setup.Request = MODE_CMD;
setup.Value = MOD_PULSE_EN;
setup.Index = ENABLEPULSE_SPUE;
setup.Length = 0x00;
setup.DataOut = FALSE;
// call the libusb driver
ret = usb_control_msg(usb_dev_handle_list[portnum],
setup.RequestTypeReservedBits,
setup.Request,
setup.Value,
setup.Index,
NULL,
setup.Length,
TIMEOUT_LIBUSB);
if (ret < 0)
{
// failure
OWERROR(OWERROR_ADAPTER_ERROR);
AdapterRecover(portnum);
return USBLevel[portnum];
}
// start the pulse
setup.RequestTypeReservedBits = 0x40;
setup.Request = COMM_CMD;
setup.Value = COMM_PULSE | COMM_IM;
setup.Index = 0;
setup.Length = 0;
setup.DataOut = FALSE;
// call the libusb driver
ret = usb_control_msg(usb_dev_handle_list[portnum],
setup.RequestTypeReservedBits,
setup.Request,
setup.Value,
setup.Index,
NULL,
setup.Length,
TIMEOUT_LIBUSB);
if (ret < 0)
{
// failure
OWERROR(OWERROR_ADAPTER_ERROR);
AdapterRecover(portnum);
return USBLevel[portnum];
}
else
{
// success, read the result
USBLevel[portnum] = new_level;
return new_level;
}
}
// unsupported
else if (new_level != USBLevel[portnum])
{
OWERROR(OWERROR_FUNC_NOT_SUP);
return USBLevel[portnum];
}
// success, return the current level
return USBLevel[portnum];
}