Embedded_SDK/MCUXpresso_MIMXRT1021xxxxx
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MCUXpresso_MIMXRT1021xxxxx/boards/evkmimxrt1020/driver_examples/cmp/interrupt
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Yilin Sun 763d32be90
Updated SDK to v2.15.000 
Signed-off-by: Yilin Sun <imi415@imi.moe>
2024-03-15 22:23:36 +08:00
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armgcc Updated SDK to v2.15.000 2024-03-15 22:23:36 +08:00
board.c Updated SDK to v2.15.000 2024-03-15 22:23:36 +08:00
board.h Updated SDK to v2.15.000 2024-03-15 22:23:36 +08:00
clock_config.c Updated to SDK v2.14.0 2023-08-31 23:30:31 +08:00
clock_config.h Updated to SDK v2.14.0 2023-08-31 23:30:31 +08:00
cmp_interrupt_v3_14.xml Updated SDK to v2.15.000 2024-03-15 22:23:36 +08:00
cmp_interrupt.c Initial SDK v2.12.0 2022-08-23 23:00:33 +08:00
dcd.c Initial SDK v2.12.0 2022-08-23 23:00:33 +08:00
dcd.h Initial SDK v2.12.0 2022-08-23 23:00:33 +08:00
evkmimxrt1020_sdram_init.jlinkscript Initial SDK v2.12.0 2022-08-23 23:00:33 +08:00
pin_mux.c Initial SDK v2.12.0 2022-08-23 23:00:33 +08:00
pin_mux.h Initial SDK v2.12.0 2022-08-23 23:00:33 +08:00
readme.md Updated SDK to v2.15.000 2024-03-15 22:23:36 +08:00

readme.md

Overview

The CMP interrupt Example shows how to use interrupt with CMP driver.

In this example, user should indicate an input channel to capture a voltage signal (can be controlled by user) as the CMP's positive channel input. On the negative side, the internal 6-bit DAC is used to generate the fixed voltage about half value of reference voltage.

When running the project, change the input voltage of user-defined channel, then the comparator's output would change between logic one and zero when the user-defined channel's voltage crosses the internal DAC's value. The change of comparator's output would generate the falling and rising edge events with their interrupts enabled. When any CMP interrupt happens, the CMP's ISR would turn on the LED light if detecting the output's rising edge, or turn off it when detecting the output's falling edge.

SDK version

  • Version: 2.15.000

Toolchain supported

  • IAR embedded Workbench 9.40.1
  • Keil MDK 5.38.1
  • GCC ARM Embedded 12.2
  • MCUXpresso 11.8.0

Hardware requirements

  • Mini/micro USB cable
  • EVK-MIMXRT1020 board
  • Personal Computer

Board settings

No special settings are required.

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 demo.

Running the demo

When the example runs successfully, the following message is displayed in the terminal:

CMP interrupt Example

Then change CMP analog input, and watch the change of LED. - CMP1_IN0 (J17-7) connected to VCC =3.3V (J19-8): USER LED on - CMP1_IN0 (J17-7) connected to GND (J19-7): USER LED off

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.