FTM Signal Measurement

Example application showing the FTM's Signal Measurement functionality

Application description


The purpose of this demo application is to show you the usage of the FlexTimer's Signal Measurement functionality from the S32K118 CPU using the S32 SDK API.

  • The application is configured to generate a PWM signal with a variable frequency which will be measured another FTM instance. The frequency will range from 300 Hz to 3000 Hz. Each step changes 100 Hz. The measurement result will be sent to the host PC via LPUART. User is able to compare pwm frequency and measurement frequency.
Note
Due to limited RAM size, this example contains only one build configuration for target flash memory (and the associated debug configuration).

Prerequisites


The run the example you will need to have the following items:

  • 1 S32K118 board
  • 1 Power Adapter 12V (if the board cannot be powered from the USB port)
  • 1 Dupont male to male
  • 3 Dupont female to female
  • 1 Personal Computer
  • 1 Jlink Lite Debugger (optional, users can use Open SDA)
  • UART to USB converter if it is not included on the target board. (Please consult your boards documentation to check if UART-USB converter is present).

Boards supported


The following boards are supported by this application:

  • S32K118EVB-Q064
  • S32K118-MB

Hardware Wiring

The following connections must be done to for this example application to work:

PIN FUNCTION S32K118EVB-Q064 S32K118-MB
FTM0 Out Channel 0 (PTD15) J4.12 - J1.7 J12.18 - J9.19
FTM1 Input Channel 6 (PTA12) J4.12 - J1.7 J12.18 - J9.19
LPUART0 TX (PTB1) UART_TX - wired on the board J10.32 - J20.3
LPUART0 RX (PTB0) UART_RX - wired on the board J10.31 - J20.6

How to run


1. Importing the project into the workspace

After opening S32 Design Studio, go to File -> New S32DS Project From... and select ftm_signal_measurement_s32k118. Then click on Finish.
The project should now be copied into you current workspace.

2. Generating the Processor Expert configuration

First go to Project Explorer View in S32 DS and select the current project(ftm_signal_measurement_s32k118). Then go to Project and click on Generate Processor Expert Code
Wait for the code generation to be completed before continuing to the next step.

3. Building the project

Select the configuration to be built FLASH (Debug_FLASH) by left clicking on the downward arrow corresponding to the build button(. Wait for the build action to be completed before continuing to the next step.

4. Running the project

Go to Run and select Debug Configurations. There will be two debug configurations for this project:

Configuration Name Description
ftm_signal_measurement_s32k118_debug_flash_jlink Debug the FLASH configuration using Segger Jlink debuggers
ftm_signal_measurement_s32k118_debug_flash_pemicro Debug the FLASH configuration using PEMicro debuggers


Select the desired debug configuration and click on Launch. Now the perspective will change to the Debug Perspective.
Use the controls to control the program flow.

Note
For more detailed information related to S32 Design Studio usage please consult the available documentation.

Notes


For this example it is necessary to open a terminal emulator and configure it with:

  • 115200 baud
  • One stop bit
  • No parity
  • No flow control
  • '\n' line ending