ftm_dual_edge_capture#
Overview#
The FTM project is a demonstration program of the SDK FTM driver’s dual-edge capture feature. This feature is available only on certain SoC’s. The example sets up a FTM channel-pair for dual-edge capture. Meanwhile, the capture mode is set up one-shot, using API FTM_SetupDualEdgeCapture(). Once the input signal is received and the second edge is detected, the interrupt flag will be cleared and the interrupt overflow will be disabled. The example gets the capture value of the input signal using API FTM_GetInputCaptureValue(). And this example will print the capture values and period of the input signal on the terminal window.
If high level input is detected on the channel when FTM timer starts, FTM will generate a capture event incorrectly although there is no rising edge. So this example ignore first pluse and measure second pluse. Need to ensure to input least two pluse into the channel, a pwm signal is recommended.
Supported Boards#
FRDM-K22F
Hardware requirements
Mini/micro USB cable
FRDM-K22F board
Personal Computer
Board settings
connect input signal to J1-14
Prepare the Demo
Connect a USB cable between the PC host and the OpenSDA USB port on the board.
Open a serial terminal with these settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the example.
Running the demo
These instructions are displayed/shown on the terminal window:
FTM dual-edge capture example
Once the input signal is received the input capture values are printed
The input signal's pulse width is calculated from the capture values & printed
Capture value C(n)V=3
Capture value C(n+1)V=5a8
Input signals pulse width=24 us
FRDM-KE02Z40M
Hardware requirements
Mini/micro USB cable
FRDM-KE02Z40M board
Personal Computer
Board settings
connect input signal to J10-4
Prepare the Demo
Connect a USB cable between the host PC and the OpenSDA USB port on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the example.
Running the demo
These instructions are displayed/shown on the terminal window:
FTM dual-edge capture example
Once the input signal is received the input capture values are printed
The input signal's pulse width is calculated from the capture values & printed
Capture value C(n)V=3
Capture value C(n+1)V=5a8
Input signals pulse width=24 us
FRDM-KE15Z
Hardware requirements
Micro USB cable
FRDM-KE15Z board
Personal Computer
Board settings
Connect input signal to J1-6
Prepare the Demo
Connect a USB cable between the host PC and the OpenSDA USB port on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the example runs successfully, the following message is displayed in the terminal:
FTM dual-edge capture example
Once the input signal is received the input capture values are printed
The input signal's pulse width is calculated from the capture values & printed
Capture value C(n)V=3
Capture value C(n+1)V=5a8
Input signals pulse width=24 us
FRDM-KE16Z
Hardware requirements
Micro USB cable
FRDM-KE16Z board
Personal Computer
Board settings
Connect input signal to J2-7
Prepare the Demo
Connect a USB cable between the host PC and the OpenSDA USB port on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the example runs successfully, the following message is displayed in the terminal:
FTM dual-edge capture example
Once the input signal is received the input capture values are printed
The input signal's pulse width is calculated from the capture values & printed
Capture value C(n)V=3
Capture value C(n+1)V=5a8
Input signals pulse width=24 us
FRDM-KE17Z
Hardware requirements
Micro USB cable
FRDM-KE17Z board
Personal Computer
Board settings
Connect input signal to J3-15
Prepare the Demo
Connect a USB cable between the host PC and the OpenSDA USB port on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the example runs successfully, the following message is displayed in the terminal:
FTM dual-edge capture example
Once the input signal is received the input capture values are printed
The input signal's pulse width is calculated from the capture values & printed
Capture value C(n)V=3
Capture value C(n+1)V=5a8
Input signals pulse width=24 us
FRDM-KE17Z512
Hardware requirements
Micro USB cable
FRDM-KE17Z512 board
Personal Computer
Board settings
Connect input signal to J3-15
Prepare the Demo
Connect a USB cable between the host PC and the MCU-LINK USB port on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the example runs successfully, the following message is displayed in the terminal:
FTM dual-edge capture example
Once the input signal is received the input capture values are printed
The input signal's pulse width is calculated from the capture values & printed
Capture value C(n)V=3
Capture value C(n+1)V=5a8
Input signals pulse width=24 us
FRDM-MCXE247
Hardware requirements
USB-C cable
FRDM-MCXE247 board
Personal Computer
Board settings
Connect input signal to J3-15
Prepare the Demo
Connect a USB cable between the host PC and the MCU-LINK USB port on the target board.
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
When the example runs successfully, the following message is displayed in the terminal:
FTM dual-edge capture example
Once the input signal is received the input capture values are printed
The input signal's pulse width is calculated from the capture values & printed
Capture value C(n)V=3
Capture value C(n+1)V=5a8
Input signals pulse width=24 us
LPCXpresso860MAX
Hardware requirements
Micro USB cable
TWR-KE18F board
Primary Elevator
Personal Computer
Board settings
The FTM pin is J1_7.
Prepare the Demo
Connect a micro USB cable between the PC host and the OpenSDA USB port on the board.
Open a serial terminal on PC for OpenSDA serial device with these settings:
9600 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
These instructions are displayed/shown on the terminal window:
FTM dual-edge capture example
Once the input signal is received the input capture values are printed
The input signal's pulse width is calculated from the capture values & printed
Capture value C(n)V=3
Capture value C(n+1)V=5a8
Input signals pulse width=24 us