Question

What peripherals on EFR32MG is the EmberZNet stack using?

Answer

Minimum Requirements

Minimum requirements for proper EmberZNet stack operation are the following:

• High Frequency Crystal Oscillator (HFXO) – Needed for high-precision timing on IEEE 802.15.4 MAC layer state machines. (Note: The EFR32 cannot run the radio off of HFRCO. HFXO is needed for high-precision timing on IEEE 802.15.4 MAC layer state machines.)
• Real Time Counter/Calendar (RTCC) – Needed to drive millisecond-driven events and sleep timing for stack and application events. Requires either Low Frequency RC Oscillator (LFRCO) or Low Frequency Crystal Oscillator (LFXO) as a clock source.
• Energy Management Unit (EMU) Temperature Change (TEMPCHANGE) – Needed to support proper operation over full operating temperature range.
• Watchdog Timer (WDOG) – Needed for self-management of code to prevent infinite loops. Requires Ultra-Low Frequency RC Oscillator (ULFRCO) as clock source.
• TIMER0 – Needed for microsecond precision delay logic.
• Clock Management Unit (CMU) – Needed for setup of clock sources.
• Nested Vector Interrupt Controller (NVIC) – Needed for interrupt management.
• Cryptographic (CRYPTO) module – Required for stack-level security functions.

Additional Resource Usage

These MCU peripherals may be needed by EmberZNet HAL, or Application Framework, or bootloader under certain use cases.

• USART0 – Used for serial interaction with serial bootloader or application’s serial command line interface (CLI) if present.
• USART1 – Used for serial interaction with dataflash for bootloader.
• LDMA (2 channels out of 8 available) – Used for serial communication.
• SerialWire Output (SWO) – Used for debug printing output if desired.
• Instruction Trace Macrocell (ITM) – Used for in-system debugging if desired.
• Packet Trace Interface (PTI) –Used for capture of TX/RX packets if desired.