pioneer_yang
Newbie level 5
Hi,
I use at89c5131 to monitor the key pad input and transmit them to the pc through the usb port. my questions are:
1) from the standard, if the usb bus is idle for 3 ms, then the usb controller will be set to suspend state, so does it means that my usb will always be in suspend state if I do not touch the key pad?
2) the resume signal comes from the host, if I touch a key when the usb control is in suspend mode, how can I wake up the usb controller and send the key number to host by software code?
Thank you.
I use at89c5131 to monitor the key pad input and transmit them to the pc through the usb port. my questions are:
1) from the standard, if the usb bus is idle for 3 ms, then the usb controller will be set to suspend state, so does it means that my usb will always be in suspend state if I do not touch the key pad?
2) the resume signal comes from the host, if I touch a key when the usb control is in suspend mode, how can I wake up the usb controller and send the key number to host by software code?
Thank you.