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LinkIt 7697 BlocklyDuino 使用指南
  • LinkIt 7697 BlocklyDuino 使用指南
    • 認識 LinkIt 7697
    • 認識 BlocklyDuino
    • BlocklyDuino v2 & v3 比較
    • 安裝開發環境 (v2)
      • 安裝 Arduino 編輯器
      • 安裝驅動並連接開發板
      • 安裝 BlocklyDuino 編輯器
      • 連結兩個編輯器並上傳程式
    • 安裝開發環境 (v3)
    • BlocklyDuino 基礎操作
    • 實作範例教學
      • A01. 內建 LED 閃爍
      • A02. 外接 LED 閃爍
      • A03. 外接 LED 呼吸燈
      • A04. RGB LED 顏色變化
      • A05. 外部按鈕控制開關
      • A06. 蜂鳴器播放聲音
      • A07 .可變電阻控制電壓輸出
      • A08. 伺服馬達控制
      • A21. DHT: 溫濕度感應器
      • A22. HTU21D: 溫溼度感應器
      • A23. PMSX003: PM2.5 感測器
      • A24. HC-SR04P: 超音波測距
      • A25. ADXL345: 加速規(動態)
      • A26. ADXL345: 加速規(手勢)
      • A27. 1602/2004: 液晶顯示模組
      • A28. WS2812: RGB 彩色燈條
      • A29. MFRC522: RFID
      • B00. Grove 相關基礎知識
      • B01. Grove 光感應器
      • B02. Grove 超音波測距感應器
      • B03. Grove 溫溼度感應器
      • B04. Grove 繼電器
      • B05. Grove LED 燈條
      • B06. Grove OLED 顯示器
      • C01. 雲端控制 LED 開關
      • C02. 上傳溫溼度到雲端
      • D01. 手機透過 BLE 讀寫裝置資料
      • E01. 遙控器: 按鈕控制 LED
    • 資源鏈結
  • LinkIt 7697 - Arduino IDE 開發指南
    • 環境設定
      • 設定 Arduino IDE
      • 將 LinkIt 7697 連接到電腦
        • 在 Windows 上安裝 CP2102N 驅動程式
        • 在 macOS 上安裝 CP2102N 驅動程式
      • 執行第一個程式
    • 開發指南
      • GPIO
      • UART
      • ADC
      • EINT (外部中斷 / External Interrupt)
      • I2C
      • SPI
      • EEPROM
      • Timer
      • Flash (索引式儲存空間)
      • RTC (Real-Time Clock)
      • Software Serial
      • 使用 Wi-Fi 函式庫
      • 使用 MCS 函式庫
        • 連接到 MCS
        • 連接到 MCSLite
          • 建立可透過 MCS Lite 控制的 Beacon
        • MCS 函式庫 API 使用手冊
          • MCSDevice
          • MCSLiteDeviceMCSLiteDevice
          • MCSDataChannel 相關類別
      • 使用 BLE 低功耗藍牙
        • 藍牙信標
        • 主控裝置
        • 周邊裝置
        • 已知限制
        • LBLE API 指南
          • LBLE
          • LBLECentral
          • LBLEPeripheral
          • LBLEAdvertisementData
          • LBLEService
          • LBLECharacteristic
          • LBLEAddress
          • LBLEUuid
          • LBLEClient
      • 使用 LinkIt Remote
        • LRemote API
        • LRemote 控制元件 API
      • LinkIt 7697 腳位的初始狀態
      • LinkIt 7697 供電說明
      • 更新 Bootloader 與韌體
      • Flash 燒錄工具
      • FOTA 更新
      • LinkIt 7697 的功能限制
      • 自行編譯 Arduino Package
      • 回報問題
    • 週邊元件連接教學
      • SMD 按鈕
      • RGB 三色 LED
      • 可變電阻
      • 九軸感應器 (MPU-9250)
      • 溫度與濕度感應器 (AM2302)
      • 超音波距離感應器
      • 光感應器 (LM358)
      • 0.96 吋 OLED 顯示模組 (SSD1308Z)
      • 長條型 LED 顯示模組 (MY9221)
      • 繼電器
      • 伺服馬達 (EMAX 9g ES08A Servo)
      • 使用 74HC595 驅動七段顯示器
      • 使用 MAX7219 驅動七段顯示器
      • 使用 MAX7219 驅動 8x8 矩陣式顯示器
      • 使用 OLED 模組 (如 SH1106 / SSD1306... 等模組)
      • 使用 PCF8574 / PCF8574A 驅動 1602 LCD
    • 開發套件與擴充板
      • Grove Starter Kit
      • Robot Shield
        • OTTO97
    • 下載
    • 資源連結
    • BSP 版本更新資訊
  • LinkIt 7697 - Development Guide for Arduino IDE
    • Environment Setup
      • Setup Arduino IDE
      • Connecting LinkIt 7697 to Computer
        • Install CP2102N Driver on Windows
        • Install CP2102N Driver on macOS
      • Run Your First Sketch
    • Developer Guide
      • GPIO
      • UART
      • ADC
      • External Interrupt
      • I2C
      • SPI
      • EEPROM
      • Timer
      • Flash (Key-Pair Storage)
      • RTC (Real-Time Clock)
      • Software Serial
      • Using the Wi-Fi Library
      • Using MCS Library
        • Connecting to MCS
        • Connecting to MCSLite
          • Build a Beacon controlled by MCS Lite
        • MCS Library API Reference
          • MCSDevice
          • MCSLiteDevice
          • MCSDataChannel Classes
      • Using Bluetooth
        • Beacons
        • Central Devices
        • Peripheral Devices
        • Limitations of LBLE library
        • LBLE Library API Guide
          • LBLE
          • LBLECentral
          • LBLEPeripheral
          • LBLEAdvertisementData
          • LBLEService
          • LBLECharacteristic
          • LBLEAddress
          • LBLEUuid
          • LBLEClient
      • Using LinkIt Remote
        • LRemote
        • LRemote Control Classes
      • Initial Pin State of LinkIt 7697
      • Powering the LinkIt 7697
      • Update Bootloader and Firmware
      • Flash Uploading Tool
      • FOTA Update
      • Limitations of LinkIt 7697
      • Source Code of Arduino Package
      • Issue Report
    • Tutorial
      • SMD Buttons
      • RGB LED
      • Potentiometer
      • IMU 9DOF v2.0 (MPU-9250)
      • Temperature and Humidity Sensor Pro (AM2302)
      • Grove Ultrasonic Ranger
      • Light Sensor (LM358)
      • Grove OLED Display 0.96" (SSD1308Z)
      • LED Bar v2.0 (MY9221)
      • Relay
      • Mini Servo (EMAX 9g ES08A Servo)
      • Driving 7-segment Displays with 74HC595
      • Driving 7-segment Displays with MAX7219
      • Driving 8x8 Dot Matrices with MAX7219
      • Using OLED module (SH1106 / SSD1306... etc.)
      • Driving 1602 LCD with PCF8574 / PCF8574A
    • Kits and Shields
      • Grove Starter Kit
      • Robot Shield
        • OTTO97
    • Download
    • Resources
    • BSP Release Notes
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  • Instantiation
  • Initialization
  • Execution
  • Stop
  • Release
  • Example Code
  1. LinkIt 7697 - Development Guide for Arduino IDE
  2. Developer Guide

Timer

PreviousEEPROMNextFlash (Key-Pair Storage)

Last updated 3 years ago

A timer class called LTimer is provided to expose the native LinkIt SDK timer functionality to Arduino developers. Please refer to the source code of File / Examples / LTimer / BlinkLED as an example. It blinks the on-board LED and an external LED with P6 pin by using two timers: one is changing the LED state in every 500ms and the other is changing in every 250ms. Here we introduce how this example is built and what action the corresponding APIs would take.

Instantiation

nclude the header file first before using the LTimer class.

#include "LTimer.h"

Developers can use up to two timers at a time in the code. The corresponding enumeration IDs are LTIMER_0 and LTIMER_1. To use timers in the code, the first step is to create the instance of the timers. This code instantiates both LTIMER_0 and LTIMER_1:

LTimer timer0(LTIMER_0);
LTimer timer1(LTIMER_1);

Initialization

After the timer instances are created, they need to be initialized. Call the .begin() function to initialize timers in the setup() part:

timer0.begin();
timer1.begin();

Execution

When the initialization is done, you can start the timer by calling the .start() function. Four parameters are needed to start a timer:

LTimerStatus start(
  uint32_t timeoutMS,
  LTimerMode timerMode,
  ltimer_callback_t callbackFunc,
  void *userData
);

The purposes of parameters are:

  • [IN] timeoutMS: timeout time in milliseconds.

  • [IN] timerMode: one shot or repeat mode. The value can be LTIMER_ONESHOT_MODE or LTIMER_REPEAT_MODE. In the one shot mode, the callback function will be invoked only once when the timer is expired and in the repeat mode, the callback function would be invoked repeatedly for every timeoutMS interval until the timer is stopped / released.

  • [IN] callbackFunc: the callback function to be called when the timer is expired.

  • [IN] userData: data to be passed when the callback function is invoked.

And the function prototype of the callback function is:

typedef void (*ltimer_callback_t)(void *user_data);

The input parameter user_data would be the same data as the userData passed when starting a timer.

Stop

For a one shot mode timer, there is no need to stop it since it only runs once. However, for a repeat mode timer, developers might want to stop it in some situations. The .stop() function can be used to stop a timer. If the timer is needed later, another .start() can be called again to trigger its operation.

Release

When a timer is no longer needed, the .end() function is used to release all resources allocated to it.

Example Code

#include "Arduino.h"
#include "LTimer.h"

int led0 = 7;
int led1 = 6;
int val0 = 0;
int val1 = 0;

// instantiation
LTimer timer0(LTIMER_0);
LTimer timer1(LTIMER_1);

// callback function for timer0
void _callback0(void *usr_data)
{
  val0 = !val0;
  digitalWrite(led0, val0);
}

// callback function for timer1
void _callback1(void *usr_data)
{
  val1 = !val1;
  digitalWrite(led1, val1);
}

void setup() {
  pinMode(led0, OUTPUT);
  pinMode(led1, OUTPUT);
  Serial.begin(115200);

  // initialization
  timer0.begin();
  timer1.begin();

  // start the execution
  timer0.start(500, LTIMER_REPEAT_MODE, _callback0, NULL);
  timer1.start(250, LTIMER_REPEAT_MODE, _callback1, NULL);
}

void loop() {
}