Detection system for detecting button being pressed and method thereof

摘要

Method for detecting presses on buttons of an electronic device with a reduced number of General Purpose In/Out (GPI/O) ports includes a number of the GPI/O ports The number of the buttons is greater than the number of the GPI/O ports. A proportion of the buttons are each coupled between one of the I/O ports and ground, and the remaining proportion of the buttons are each coupled between any two of the I/O ports. The GPI/O ports are set to work in a first working state or in a second state to provide a first signal or second signal respectively. When a signal provided by a GPI/O port working at the first working mode changes, the method determines which one of the buttons has been pressed.

主权项

1. A detection system for detecting pressing operation to button applied in an electronic device, comprising:
an input/output (I/O) port unit comprising a plurality of I/O ports, each of the I/O ports comprising a first working mode and a second working mode, each of the I/O ports configured to provide a first signal or a second signal at each of the first and second working modes; a button unit comprising a plurality of buttons, each button is coupled to at least one of the I/O ports, wherein a number of the buttons is greater than a number of the I/O ports; a processing unit comprising a setting module for setting each I/O port to work at the first working mode or the second working mode to provide the first signal or the second signal at an original state, a detection module for detecting whether a signal provided by each I/O port is changed or not compared to the original state and determining which button is pressed if the signal provided by one of the I/O ports is changed, and a controlling module for controlling the electronic device to perform an operation associated with the pressed button.