Win32 Serial Communication & DeviceIoControl()

button_basher · 11-30-2005, 11:27 AM

Is it possible to use the DeviceIoControl() function to send commands directly to the driver for a COM port?

I am developing a time sensitive Win32 serial port application where I periodically need to change the parity of my serial data. Calls to Get_Comm_State() & Set_Comm_State() to update the parity are taking too long. I observed (using a serial port monitor) that these get and set methods do alot of unnessecary things like seting the baud rate etc.

It would be nice if I could use the DeviceIoControl function along with the IOCTL_SERIAL_SET_LINE_CONTROL command (or similar) to quickly change the parity from within my application. Am I living in a fantasy world or is this a possibility?

Many thanks

B_B

bithub · 12-01-2005, 09:37 PM

I don't believe there is any device control code which can be used to change the parity on a COM device.

11-30-2005, 11:27 AM	#1
button_basher Registered User Join Date: Nov 2005 Posts: 0	Win32 Serial Communication & DeviceIoControl() Is it possible to use the DeviceIoControl() function to send commands directly to the driver for a COM port? I am developing a time sensitive Win32 serial port application where I periodically need to change the parity of my serial data. Calls to Get_Comm_State() & Set_Comm_State() to update the parity are taking too long. I observed (using a serial port monitor) that these get and set methods do alot of unnessecary things like seting the baud rate etc. It would be nice if I could use the DeviceIoControl function along with the IOCTL_SERIAL_SET_LINE_CONTROL command (or similar) to quickly change the parity from within my application. Am I living in a fantasy world or is this a possibility? Many thanks B_B
button_basher is offline

12-01-2005, 09:37 PM	#2
bithub Registered User Join Date: Sep 2004 Location: California Posts: 3,020	I don't believe there is any device control code which can be used to change the parity on a COM device.
bithub is offline

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