Miscellaneous

This module includes platform abstractions for miscellaneous behaviors.

Summary

Enumerations
`otPlatMcuPowerState{ OT_PLAT_MCU_POWER_STATE_ON = 0, OT_PLAT_MCU_POWER_STATE_LOW_POWER = 1, OT_PLAT_MCU_POWER_STATE_OFF = 2 }`	enum Enumeration of micro-controller's power states.
`otPlatResetReason`	enum Enumeration of possible reset reason codes.

Functions
`otPlatAssertFail(const char *aFilename, int aLineNumber)`	`void` This function provides a platform specific implementation for assert.
`otPlatGetMcuPowerState(otInstance *aInstance)`	`otPlatMcuPowerState` This function gets the current desired MCU power state.
`otPlatGetResetReason(otInstance *aInstance)`	`otPlatResetReason` This function returns the reason for the last platform reset.
`otPlatReset(otInstance *aInstance)`	`void` This function performs a software reset on the platform, if supported.
`otPlatSetMcuPowerState(otInstance *aInstance, otPlatMcuPowerState aState)`	`otError` This function sets the desired MCU power state.
`otPlatWakeHost(void)`	`void` This function performs a platform specific operation to wake the host MCU.

Enumerations

otPlatMcuPowerState

 otPlatMcuPowerState

Enumeration of micro-controller's power states.

These values are used for NCP configuration when OPENTHREAD_CONFIG_NCP_ENABLE_MCU_POWER_STATE_CONTROL is enabled.

The power state specifies the desired power state of NCP's micro-controller (MCU) when the underlying platform's operating system enters idle mode (i.e., all active tasks/events are processed and the MCU can potentially enter a energy-saving power state).

The power state primarily determines how the host should interact with the NCP and whether the host needs an external trigger (a "poke") to NCP before it can communicate with the NCP or not.

After a reset, the MCU power state MUST be OT_PLAT_POWER_STATE_ON.

Properties

Properties
`OT_PLAT_MCU_POWER_STATE_LOW_POWER`	NCP's MCU can enter low-power (energy-saving) state. When the NCP's desired power state is set to `LOW_POWER`, host is expected to "poke" the NCP (e.g., an external trigger like an interrupt) before it can communicate with the NCP (send a message to the NCP). The "poke" mechanism is determined by the platform code (based on NCP's interface to the host). While power state is set to `LOW_POWER`, NCP can still (at any time) send messages to host. Note that receiving a message from the NCP does NOT indicate that the NCP's power state has changed, i.e., host is expected to continue to "poke" when it wants to talk to the NCP until the power state is explicitly changed (by a successful call to `otPlatSetMcuPowerState()` changing the state to `ON`). Note: The `LOW_POWER` power state only determines the MCU's power mode and is not related to radio's state (radio is managed by OpenThread core and device role, e.g., device being sleepy or not.
`OT_PLAT_MCU_POWER_STATE_OFF`	NCP is fully off. An NCP hardware reset (via a RESET pin) is required to bring the NCP back to `SPINEL_MCU_POWER_STATE_ON`. RAM is not retained after reset.
`OT_PLAT_MCU_POWER_STATE_ON`	NCP's MCU stays on and active all the time. When the NCP's desired power state is set to `ON`, host can send messages to NCP without requiring any "poke" or external triggers. Note: The `ON` power state only determines the MCU's power mode and is not related to radio's state.

OT_PLAT_MCU_POWER_STATE_LOW_POWER

NCP's MCU can enter low-power (energy-saving) state.

When the NCP's desired power state is set to LOW_POWER, host is expected to "poke" the NCP (e.g., an external trigger like an interrupt) before it can communicate with the NCP (send a message to the NCP). The "poke" mechanism is determined by the platform code (based on NCP's interface to the host).

While power state is set to LOW_POWER, NCP can still (at any time) send messages to host. Note that receiving a message from the NCP does NOT indicate that the NCP's power state has changed, i.e., host is expected to continue to "poke" when it wants to talk to the NCP until the power state is explicitly changed (by a successful call to otPlatSetMcuPowerState() changing the state to ON).

Note: The LOW_POWER power state only determines the MCU's power mode and is not related to radio's state (radio is managed by OpenThread core and device role, e.g., device being sleepy or not.

OT_PLAT_MCU_POWER_STATE_OFF

NCP is fully off.

An NCP hardware reset (via a RESET pin) is required to bring the NCP back to SPINEL_MCU_POWER_STATE_ON. RAM is not retained after reset.

OT_PLAT_MCU_POWER_STATE_ON

NCP's MCU stays on and active all the time.

When the NCP's desired power state is set to ON, host can send messages to NCP without requiring any "poke" or external triggers.

Note: The ON power state only determines the MCU's power mode and is not related to radio's state.

otPlatResetReason

 otPlatResetReason

Enumeration of possible reset reason codes.

These are in the same order as the Spinel reset reason codes.

Functions

otPlatAssertFail

void otPlatAssertFail(
  const char *aFilename,
  int aLineNumber
)

This function provides a platform specific implementation for assert.

Details

Parameters

`[in] aFilename`	The name of the file where the assert occurred.
`[in] aLineNumber`	The line number in the file where the assert occurred.

otPlatGetMcuPowerState

otPlatMcuPowerState otPlatGetMcuPowerState(
  otInstance *aInstance
)

This function gets the current desired MCU power state.

This is only applicable and used for NCP configuration when OPENTHREAD_CONFIG_NCP_ENABLE_MCU_POWER_STATE_CONTROL is enabled.

After a reset, the power state MUST return OT_PLAT_POWER_STATE_ON. During operation, power state SHOULD only change through an explicit successful call to otPlatSetMcuPowerState().

Details

Parameters

[in] aInstance

A pointer to OpenThread instance.

Returns

The current power state.

otPlatGetResetReason

otPlatResetReason otPlatGetResetReason(
  otInstance *aInstance
)

This function returns the reason for the last platform reset.

Details

Parameters

[in] aInstance

The OpenThread instance structure.

otPlatReset

void otPlatReset(
  otInstance *aInstance
)

This function performs a software reset on the platform, if supported.

Details

Parameters

[in] aInstance

The OpenThread instance structure.

otPlatSetMcuPowerState

otError otPlatSetMcuPowerState(
  otInstance *aInstance,
  otPlatMcuPowerState aState
)

This function sets the desired MCU power state.

This is only applicable and used for NCP configuration when OPENTHREAD_CONFIG_NCP_ENABLE_MCU_POWER_STATE_CONTROL is enabled.

Details

Parameters

`[in] aInstance`	A pointer to OpenThread instance.
`[in] aState`	The new MCU power state.

Return Values

`OT_ERROR_NONE`	The power state updated successfully.
`OT_ERROR_FAILED`	The given MCU power state is not supported by the platform.

otPlatWakeHost

void otPlatWakeHost(
  void
)

This function performs a platform specific operation to wake the host MCU.

This is used only for NCP configurations.

Resources

OpenThread API Reference topics originate from the source code, available on GitHub. For more information, or to contribute to our documentation, refer to Resources.