Simple timer

The simple timer driver can be used to create a single timer instance based on the TIMER1 peripheral. On time-out, a user-defined time-out handler is called directly from the TIMER1 interrupt handler.

The interrupt handler runs at priority level APP_LOW.

The following features are supported:

• Tickless timer.
• Two modes: single shot mode and repeated mode.

The following limitations are known:

• No more than one timer can run simultaneously.
• The timer is hard-coded to use the TIMER1 peripheral.
• The timer is hard-coded to 16-bit width mode.