sctimer_input_capture
Overview
The SCTimer project is a demonstration program of the SDK SCTimer driver’s input capture feature. This example uses Event 0 to 4, State 0 and 1, Capture 0 to 3, Match 4, one user defined input.
If high level input is detected on the channel when SCTimer timer starts, SCTimer will generate a capture event incorrectly although there is no rising edge. So this example ignore first pluse and capture second pluse. Event 0 and 1 occur in state 0. They are triggered by first rising and falling edge. After event 1 is triggered, new state is state 1. Event 2 and 3 are triggered continuously by following rising and falling edge in state 1. Event 0,1,2,3 cause Capture 0,1,2,3 individually. SCTimer capture second pluse in state 1. Event 4 is used as counter limit(reset). Event 4 causes Match 4, match value is 65535.
This example gets the capture value of the input signal using API SCTIMER_GetCaptureValue() in Event 2 and 3 interrupt.
Need to ensure to input least two pluse into the channel, a pwm signal is recommended. This example will print the capture values and pluse width of the input signal on the terminal window.