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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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.

Gecko SDK Suite 2.7

• BRD4181A

Connect the WSTK to PC through USB cable

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.

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.

• ZigbeeMinimalSoc4181A_EM4WU

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.

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