SLEEP LED Breathe 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 breathe mode.

Requirements

For hardware requirements, please refer to the Requirements.

Wiring

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

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

../../../_images/SLEEP_LED_Sample_Code_Hardware_Connection_Diagram.png — SLEEP LED Sample Code Hardware Connection Diagram

Configurations

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
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_breathe_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 turn from dark to bright and then from bright to dark in breathe mode.

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 breathe mode is shown in the following figure.

../../../_images/SLEEP_LED_Breathe_Mode_Flow_Chart.png — SLEEP LED Breathe Mode Initialization Flow Chart

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);
}

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

Initialize the SLEEP LED peripheral:

Define the SLEEP_LED_InitTypeDef type Led_Initsturcture, and call SleepLed_StructInit() to pre-fill Led_Initsturcture with default values.
Modify the Led_Initsturcture parameters as needed. The SLEEP LED initialization parameter configuration is shown in the table below.
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`	320
Mode	`SLEEP_LED_InitTypeDef::mode`	`LED_BREATHE_MODE`
Polarity	`SLEEP_LED_InitTypeDef::polarity`	`LED_OUTPUT_NORMAL`
Duty Update Time	`SLEEP_LED_InitTypeDef::phase_uptate_rate`	Phase0: 0 (10ms) Phase1: 0 (10ms) Phase2: 0 (10ms) Phase3: 0 (10ms) Phase4: 0 (10ms) Phase5: 0 (10ms) Phase6: 0 (10ms) Phase7: 0 (10ms)
The Duration of The Whole Phase	`SLEEP_LED_InitTypeDef::phase_phase_tick`	Phase0: 50 (500ms) Phase1: 50 (500ms) Phase2: 50 (500ms) Phase3: 50 (500ms) Phase4: 50 (500ms) Phase5: 50 (500ms) Phase6: 50 (500ms) Phase7: 50 (500ms)
Initial High Level Time	`SLEEP_LED_InitTypeDef::phase_initial_duty`	Phase0: 0 (0) Phase1: 100 (3.125ms) Phase2: 200 (6.25ms) Phase3: 300 (9.375ms) Phase4: 300 (9.375ms) Phase5: 200 (6.25ms) Phase6: 100 (3.125ms) Phase7: 0 (0)
Duty Step Time	`SLEEP_LED_InitTypeDef::phase_duty_step`	Phase0: 1 (0.03125ms) Phase1: 2 (0.0625ms) Phase2: 3 (0.09375ms) Phase3: 4 (0.125ms) Phase4: 1 (0.03125ms) Phase5: 2 (0.0625ms) Phase6: 3 (0.09375ms) Phase7: 0 (0)
The Direction of Each Change of Duty	`SLEEP_LED_InitTypeDef::phase_increase_duty`	Phase0: 1 (increase) Phase1: 1 (increase) Phase2: 1 (increase) Phase3: 1 (increase) Phase4: 0 (decrease) Phase5: 0 (decrease) Phase6: 0 (decrease) Phase7: 0 (decrease)

Call SleepLed_Cmd() to enable SLEEP LED.