IR Pulse Number Detection

This sample code guide is designed to help users easily and comprehensively understand IR sample. This sample demonstrates the pulse number detection with IR.

Requirements

For hardware requirements, please refer to the Requirements.

Wiring

Connect P2_1 to PWM output.

Configurations

  1. The following macros can be configured to modify pin definitions.

    • #define DETECT_PIN                     P2_1

  2. The following macros can be configured to modify the maximum number of pulse detections.

    • #define MAX_DETECT_PULSE_CNT           100

  3. The entry function is as follows, call this function in main() to run this sample code. For more details, please refer to the Initialization.

    ir_detect_pulse_demo();

Building and Downloading

For building and downloading, please refer to the Building and Downloading.

Experimental Verification

Preparation Phase

Pulse detection is performed every 100ms, and the pulse detection data is printed in Debug Analyzer after each pulse detection.

ir_detect_callback index xx level xx time xx

Code Overview

This section introduces the code and process description for initialization and corresponding function implementation in the sample.

Source Code Directory

  • For project directory, please refer to Source Code Directory.

  • Source code directory: sdk\src\sample\io_demo\ir\detect_pulse_demo\ir_detect_pulse_demo.c.

Initialization

  1. Call ir_detect_pulse_init to initialize IR pulse detection module.

  2. Call ir_detect_pulse_register_callback to register callback to IR pulse detection module.

  3. Call os_timer_create() to create a software timer.

  4. Call io_dlps_register() to initialize IO store/restore and do not need to worry about which IO peripheral requires specific handling.

  5. Call bt_power_mode_set() to set Bluetooth MAC deep sleep mode.

  6. Call power_mode_set() to switch the system to DLPS mode.

Functional Implementation

Software Timer Callback Handle

When the software timer timeout, the software timer callback function will be executed:

  1. Call ir_detect_pulse_start to start IR pulse detection and DLPS will be disabled.

IR Pulse Detection Callback Handle

When IR pulse detection ends, the IR pulse detection callback function will be executed:

  1. Get pulse detection data.

  2. Call ir_detect_pulse_stop to stop IR pulse detection and DLPS will be enabled.