Cortex-M4 Control Functions

General Description

Functions
uint32_t	Cy_SysGetCM4Status (void)
	Returns the Cortex-M4 core power mode. More...
void	Cy_SysEnableCM4 (uint32_t vectorTableOffset)
	Sets vector table base address and enables the Cortex-M4 core. More...
void	Cy_SysDisableCM4 (void)
	Disables the Cortex-M4 core and waits for the mode to take the effect. More...
void	Cy_SysRetainCM4 (void)
	Retains the Cortex-M4 core and exists without waiting for the mode to take effect. More...
void	Cy_SysResetCM4 (void)
	Resets the Cortex-M4 core and waits for the mode to take the effect. More...

Function Documentation

Cy_SysGetCM4Status()

uint32_t Cy_SysGetCM4Status

(

void

)

Returns the Cortex-M4 core power mode.

Returns

Cortex-M4 Status Macros

Cy_SysEnableCM4()

void Cy_SysEnableCM4

(

uint32_t

vectorTableOffset

)

Sets vector table base address and enables the Cortex-M4 core.

Note

If the CPU is already enabled, it is reset and then enabled.

Parameters

vectorTableOffset

The offset of the vector table base address from memory address 0x00000000. The offset should be multiple to 1024 bytes.

Cy_SysDisableCM4()

void Cy_SysDisableCM4

(

void

)

Disables the Cortex-M4 core and waits for the mode to take the effect.

Warning

Do not call the function while the Cortex-M4 is executing because such a call may corrupt/abort a pending bus-transaction by the CPU and cause unexpected behavior in the system including a deadlock. Call the function while the Cortex-M4 core is in the Sleep or Deep Sleep low-power mode. Use the SysPm (System Power Management) Power Management (syspm) API to put the CPU into the low-power modes. Use the Cy_SysPm_ReadStatus() to get a status of the CPU.

Cy_SysRetainCM4()

void Cy_SysRetainCM4

(

void

)

Retains the Cortex-M4 core and exists without waiting for the mode to take effect.

Note

The retained mode can be entered only from the enabled mode.

Warning

Do not call the function while the Cortex-M4 is executing because such a call may corrupt/abort a pending bus-transaction by the CPU and cause unexpected behavior in the system including a deadlock. Call the function while the Cortex-M4 core is in the Sleep or Deep Sleep low-power mode. Use the SysPm (System Power Management) Power Management (syspm) API to put the CPU into the low-power modes. Use the Cy_SysPm_ReadStatus() to get a status of the CPU.

Cy_SysResetCM4()

void Cy_SysResetCM4

(

void

)

Resets the Cortex-M4 core and waits for the mode to take the effect.

Note

The reset mode can not be entered from the retained mode.

Warning

Do not call the function while the Cortex-M4 is executing because such a call may corrupt/abort a pending bus-transaction by the CPU and cause unexpected behavior in the system including a deadlock. Call the function while the Cortex-M4 core is in the Sleep or Deep Sleep low-power mode. Use the SysPm (System Power Management) Power Management (syspm) API to put the CPU into the low-power modes. Use the Cy_SysPm_ReadStatus() to get a status of the CPU.