Zigbee FAQ Waking BRD4180A BRD4181A with Buttons

Table of Contents

• Waking BRD4180A/BRD4181A with Buttons
  • 1. Overview
  • 2. Gecko SDK version
  • 3. Hardware Required
  • 4. Connections Required
  • 5. Setup
  • 6. How It Works
  • 7. .sls Projects Used
  • 8. How to Port to Another Part
  • 9. Special Notes

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Waking BRD4180A/BRD4181A with Buttons

1. Overview

On series 2, only the pins of GPIO port A and B remain full fuctional in sleep mode. In other words, only pins from GPIO port A and B are capable of waking the chip from sleep mode. Besides that, the GPIO_EM4WUx pins are also capable of waking the chip from sleep mode, but they need extra settings.

Unfortunately, on our radio board BRD4180A/BRD4181A, PD2 and PD3 is used as the buttons, so we can't use the two buttons of BRD4180A/BRD4181A to wake up the device.

In this page, we will introduce the changes you need to wake up BRD4180A/BRD4181A with the buttons.

2. Gecko SDK version

Gecko SDK Suite 2.7

3. Hardware Required

• BRD4181A

4. Connections Required

Connect the WSTK to PC through USB cable

5. Setup

Below are the steps of setting up the projects:

1. Create the sample ZigbeeMinimal;

2. Turn to HAL tab, hit the button Open Hardware Configurator, then disable button.

   

3. Turn to Callbacks tab, select the following callbacks:

   • emberAfMainInitCallback

4. Save and generate.

5. Edit the source file ZigbeeMinimalSoc4181A_EM4WU_callbacks.c, add the following source code:

   extern bool emAfForceEndDeviceToStayAwake;
   void hal_EM4WU_Isr(uint8_t pin)
   
   {
   	halToggleLed(1);
   	emAfForceEndDeviceToStayAwake = !emAfForceEndDeviceToStayAwake;
   }
   
   void emberAfMainInitCallback(void)
   {
   	CMU_ClockEnable(cmuClock_GPIO, true);
   
   	GPIO_PinModeSet(gpioPortD, 2, gpioModeInput, 1);
   	GPIO_EM4EnablePinWakeup(1 << 25, 0); //PD2 is EM4WU9
   
   	GPIOINT_Init();
   	GPIO->IEN = 1<<25; //25=9+16 EM4UIEN is in the higher 16bit
   	GPIO->EM4WUEN = 1<<25;
   	GPIO_IntClear(1<<25);
   
   	GPIOINT_CallbackRegister(25, hal_EM4WU_Isr);
   }

6. Modify the source file emdrv/gpiointerrupt.c, here we need the following changes:

   • Change the size of the array gpioCallbacks from 16 to 32, as the interrupt of GPIO_EM4WU is in the high 16bit.
   • Change the bit mask in function GPIO_ODD_IRQHandler and GPIO_EVEN_IRQHandler, from 0x0000AAAA and 0x00005555 to 0xAAAAAAAA and 0x55555555 respectively.

7. Save and build.

6. How It Works

The GPIO_EM4WUx pins are capable of waking up the chip, but they need extra settings. We need to call API GPIO_EM4EnablePinWakeup to enable these functions. After that, enable the interrupt of GPIO_EM4WU and register a handler for that interrupt.

7. .sls Projects Used

• ZigbeeMinimalSoc4181A_EM4WU

8. How to Port to Another Part

Start Simplicity Studio, import the project and then open the .isc file. Turn to "General" tab, hit the button Edit Architecture, change the board type or compiler.

9. Special Notes

NA