Overview
========
The QTMR project is a demonstration program of the SDK QTMR driver's input capture and output pwm feature.
The example sets up a QTMR channel for input capture. Once the input signal is received,
this example will enter interrupt and print the capture value.
The example also sets up one QTMR channel to output pwm. The user should probe a 50Khz PWM signal output with
50% dutycycle with a oscilloscope.
Toolchain supported
===================
- IAR embedded Workbench 9.30.1
- Keil MDK 5.37
- GCC ARM Embedded 10.3.1
- MCUXpresso 11.6.0
Hardware requirements
=====================
- Mini/micro USB cable
- EVK-MIMXRT1020 board
- Personal Computer
- Oscilloscope
Board settings
==============
- Connect input signal to J16-13.
- Use oscilloscope to measure output the signal pin at J17-5.
- Remove the R116 on the board when use pin J16-13 as input or output.
Prepare the Demo
================
1. Connect a USB cable between the host PC and the OpenSDA USB port on the target board.
2. Open a serial terminal with the following settings:
- 115200 baud rate
- 8 data bits
- No parity
- One stop bit
- No flow control
3. Download the program to the target board.
4. Either press the reset button on your board or launch the debugger in your IDE to begin running the example.
Running the demo
================
When the demo runs successfully, the following message is displayed in the terminal:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
****Input capture example.****
****Provide a signal input to the QTMR pin****
Captured Period time = 1000 us (±5%)
****Output PWM example.****
*********Make sure to connect an oscilloscope.*********
****A 50 duty cycle PWM wave is observed on an oscilloscope.****
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Note:
To debug in qspiflash, following steps are needed:
1. Select the flash target and compile.
2. Set the SW8: 1 off 2 off 3 on 4 off, then power on the board and connect USB cable to J23.
3. Start debugging in IDE.
- Keil: Click "Download (F8)" to program the image to qspiflash first then clicking "Start/Stop Debug Session (Ctrl+F5)" to start debugging.
