SLEEP LED Blink Mode

This sample code guide is designed to help users easily and comprehensively understand SLEEP LED sample. In this sample, SLEEP LED is configured in blink mode.

Requirements

For hardware requirements, please refer to the Requirements.

Wiring

Connect P0_1 to LED1 and connect P2_1 to LED2 and connect P2_2 to LED3 On the EVB.

The hardware connection of SLEEP LED sample code is shown in the figure below.

SLEEP LED Sample Code Hardware Connection Diagram

Configurations

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

   • #define LED_OUT_0       ADC_1

   • #define LED_OUT_1       P2_1

   • #define LED_OUT_2       P2_2

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

   sleep_led_blink_demo();
   

Building and Downloading

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

Experimental Verification

Press the Reset button on the EVB board, LEDs blink with 200ms on and 100ms off.

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\led\sleep_led_demo.c.

Initialization

The initialization flow for peripherals can refer to Initialization Flow.

The initialization flow of SLEEP LED blink mode is shown in the following figure.

SLEEP LED Blink Mode Initialization Flow Chart

1. Call Pad_Config() and Pad_FunctionConfig() to initialize the pin.

   static void board_led_init(void)
   {
      Pad_Config(LED_OUT_0, PAD_SW_MODE, PAD_IS_PWRON, PAD_PULL_NONE, PAD_OUT_ENABLE, PAD_OUT_HIGH);
      Pad_Config(LED_OUT_1, PAD_SW_MODE, PAD_IS_PWRON, PAD_PULL_NONE, PAD_OUT_ENABLE, PAD_OUT_HIGH);
      Pad_Config(LED_OUT_2, PAD_SW_MODE, PAD_IS_PWRON, PAD_PULL_NONE, PAD_OUT_ENABLE, PAD_OUT_HIGH);
   
      Pad_FunctionConfig(LED_OUT_0, LED0);
      Pad_FunctionConfig(LED_OUT_1, LED1);
      Pad_FunctionConfig(LED_OUT_2, LED2);
   }
   

2. Call SleepLed_Reset() to clear all SLEEP LED registers to their default reset values.

3. Initialize the SLEEP LED peripheral:

   1. Define the SLEEP_LED_InitTypeDef type Led_Initsturcture, and call SleepLed_StructInit() to pre-fill Led_Initsturcture with default values.

   2. Modify the Led_Initsturcture parameters as needed. The SLEEP LED initialization parameter configuration is shown in the table below.

   3. Call SleepLed_Init() to initialize the SLEEP LED peripheral.

   SLEEP LED Initialization Parameters

   SLEEP LED Hardware Parameters	Setting in the Led_Initsturcture Variables	SLEEP LED
   Clock Division Factor	SLEEP_LED_InitTypeDef::prescale	32
   Mode	SLEEP_LED_InitTypeDef::mode	LED_BLINK_MODE
   Polarity	SLEEP_LED_InitTypeDef::polarity	LED_OUTPUT_NORMAL
   High Level Time	SLEEP_LED_InitTypeDef::period_high	Channel0 Period0: 200 (200ms) Channel0 Period1: 200 (200ms) Channel0 Period2 : 200 (200ms) Channel1 Period0: 200 (200ms) Channel1 Period1: 200 (200ms) Channel1 Period2 : 0 (0) Channel2 Period0: 200 (200ms) Channel2 Period1: 0 (0) Channel2 Period2 : 0 (0)
   Low Level Time	SLEEP_LED_InitTypeDef::period_low	Channel0 Period0: 100 (100ms) Channel0 Period1: 100 (100ms) Channel0 Period2 : 100 (100ms) Channel1 Period0: 100 (100ms) Channel1 Period1: 100 (100ms) Channel1 Period2 : 0 (0) Channel2 Period0: 100 (100ms) Channel2 Period1: 0 (0) Channel2 Period2 : 0 (0)

4. Call SleepLed_Cmd() to enable SLEEP LED.