system_efm32pg12b.c File Reference

Detailed Description

CMSIS Cortex-M3/M4 System Layer for EFM32 devices.

Version

5.1.2

License

Copyright 2017 Silicon Laboratories, Inc. http://www.silabs.com

Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software.
   
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
   
3. This notice may not be removed or altered from any source distribution.

DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Laboratories, Inc. has no obligation to support this Software. Silicon Laboratories, Inc. is providing the Software "AS IS", with no express or implied warranties of any kind, including, but not limited to, any implied warranties of merchantability or fitness for any particular purpose or warranties against infringement of any proprietary rights of a third party.

Silicon Laboratories, Inc. will not be liable for any consequential, incidental, or special damages, or any other relief, or for any claim by any third party, arising from your use of this Software.

Definition in file system_efm32pg12b.c.

#include <stdint.h>
#include "em_device.h"

Go to the source code of this file.

Macros
#define	EFM32_HFRCO_MAX_FREQ   (38000000UL)
#define	EFM32_HFRCO_STARTUP_FREQ   (19000000UL)
#define	EFM32_HFXO_FREQ   (40000000UL)
#define	EFM32_LFRCO_FREQ   (32768UL)
#define	EFM32_LFXO_FREQ   (EFM32_LFRCO_FREQ)
#define	EFM32_ULFRCO_FREQ   (1000UL)

Functions
uint32_t	SystemCoreClockGet (void)
	Get the current core clock frequency. More...
uint32_t	SystemHFClockGet (void)
	Get the current HFCLK frequency. More...
uint32_t	SystemHFXOClockGet (void)
	Get high frequency crystal oscillator clock frequency for target system. More...
void	SystemHFXOClockSet (uint32_t freq)
	Set high frequency crystal oscillator clock frequency for target system. More...
void	SystemInit (void)
	Initialize the system. More...
uint32_t	SystemLFRCOClockGet (void)
	Get low frequency RC oscillator clock frequency for target system. More...
uint32_t	SystemLFXOClockGet (void)
	Get low frequency crystal oscillator clock frequency for target system. More...
void	SystemLFXOClockSet (uint32_t freq)
	Set low frequency crystal oscillator clock frequency for target system. More...
uint32_t	SystemMaxCoreClockGet (void)
	Get the maximum core clock frequency. More...
uint32_t	SystemULFRCOClockGet (void)
	Get ultra low frequency RC oscillator clock frequency for target system. More...

Variables
uint32_t	SystemCoreClock
	System System Clock Frequency (Core Clock). More...
uint32_t	SystemHfrcoFreq = EFM32_HFRCO_STARTUP_FREQ
	System HFRCO frequency. More...

Macro Definition Documentation

#define EFM32_LFRCO_FREQ   (32768UL)

LFRCO frequency, tuned to below frequency during manufacturing.

Definition at line 41 of file system_efm32pg12b.c.

Referenced by SystemHFClockGet(), and SystemLFRCOClockGet().

#define EFM32_LFXO_FREQ   (EFM32_LFRCO_FREQ)

(DO_NOT_INCLUDE_WITH_DOXYGEN)

Definition at line 78 of file system_efm32pg12b.c.

Function Documentation

uint32_t SystemCoreClockGet

(

void

)

Get the current core clock frequency.

Calculate and get the current core clock frequency based on the current configuration. Assuming that the SystemCoreClock global variable is maintained, the core clock frequency is stored in that variable as well. This function will however calculate the core clock based on actual HW configuration. It will also update the SystemCoreClock global variable.

Note

This is an EFM32 proprietary function, not part of the CMSIS definition.

Returns

The current core clock frequency in Hz.

Definition at line 137 of file system_efm32pg12b.c.

References _CMU_HFCOREPRESC_PRESC_MASK, _CMU_HFCOREPRESC_PRESC_SHIFT, CMU, SystemCoreClock, and SystemHFClockGet().

Referenced by CMU_ClockDivSet(), CMU_ClockFreqGet(), CMU_ClockPrescSet(), CMU_ClockSelectSet(), CMU_HFRCOBandSet(), MSC_Init(), SystemCoreClockUpdate(), SystemHFXOClockSet(), SystemLFXOClockSet(), TFT_AddressMappedInit(), and TFT_DirectInit().

uint32_t SystemHFClockGet

(

void

)

Get the current HFCLK frequency.

Note

This is an EFM32 proprietary function, not part of the CMSIS definition.

Returns

The current HFCLK frequency in Hz.

Definition at line 181 of file system_efm32pg12b.c.

References _CMU_HFCLKSTATUS_SELECTED_MASK, _CMU_HFPRESC_PRESC_MASK, _CMU_HFPRESC_PRESC_SHIFT, CMU, CMU_HFCLKSTATUS_SELECTED_HFXO, CMU_HFCLKSTATUS_SELECTED_LFRCO, CMU_HFCLKSTATUS_SELECTED_LFXO, EFM32_LFRCO_FREQ, and SystemHfrcoFreq.

Referenced by CMU_ClockDivSet(), CMU_ClockFreqGet(), EMU_VScaleEM01(), EMU_VScaleEM01ByClock(), and SystemCoreClockGet().

uint32_t SystemHFXOClockGet

(

void

)

Get high frequency crystal oscillator clock frequency for target system.

Note

This is an EFM32 proprietary function, not part of the CMSIS definition.

Returns

HFXO frequency in Hz.

Definition at line 231 of file system_efm32pg12b.c.

Referenced by CMU_ClockSelectSet(), and CMU_HFXOAutostartEnable().

void SystemHFXOClockSet

(

uint32_t

freq

)

Set high frequency crystal oscillator clock frequency for target system.

Note

This function is mainly provided for being able to handle target systems with different HF crystal oscillator frequencies run-time. If used, it should probably only be used once during system startup.

This is an EFM32 proprietary function, not part of the CMSIS definition.

Parameters

[in]

freq

HFXO frequency in Hz used for target.

Definition at line 257 of file system_efm32pg12b.c.

References _CMU_HFCLKSTATUS_SELECTED_MASK, CMU, CMU_HFCLKSTATUS_SELECTED_HFXO, and SystemCoreClockGet().

void SystemInit

(

void

)

Initialize the system.

Do required generic HW system init.

Note

This function is invoked during system init, before the main() routine and any data has been initialized. For this reason, it cannot do any initialization of variables etc.

Definition at line 287 of file system_efm32pg12b.c.

uint32_t SystemLFRCOClockGet

(

void

)

Get low frequency RC oscillator clock frequency for target system.

Note

This is an EFM32 proprietary function, not part of the CMSIS definition.

Returns

LFRCO frequency in Hz.

Definition at line 307 of file system_efm32pg12b.c.

References EFM32_LFRCO_FREQ.

uint32_t SystemLFXOClockGet

(

void

)

Get low frequency crystal oscillator clock frequency for target system.

Note

This is an EFM32 proprietary function, not part of the CMSIS definition.

Returns

LFXO frequency in Hz.

Definition at line 343 of file system_efm32pg12b.c.

Referenced by UARTDRV_InitLeuart().

void SystemLFXOClockSet

(

uint32_t

freq

)

Set low frequency crystal oscillator clock frequency for target system.

Note

This function is mainly provided for being able to handle target systems with different HF crystal oscillator frequencies run-time. If used, it should probably only be used once during system startup.

This is an EFM32 proprietary function, not part of the CMSIS definition.

Parameters

[in]

freq

LFXO frequency in Hz used for target.

Definition at line 369 of file system_efm32pg12b.c.

References _CMU_HFCLKSTATUS_SELECTED_MASK, CMU, CMU_HFCLKSTATUS_SELECTED_LFXO, and SystemCoreClockGet().

uint32_t SystemMaxCoreClockGet

(

void

)

Get the maximum core clock frequency.

Note

This is an EFM32 proprietary function, not part of the CMSIS definition.

Returns

The maximum core clock frequency in Hz.

Definition at line 164 of file system_efm32pg12b.c.

uint32_t SystemULFRCOClockGet

(

void

)

Get ultra low frequency RC oscillator clock frequency for target system.

Note

This is an EFM32 proprietary function, not part of the CMSIS definition.

Returns

ULFRCO frequency in Hz.

Definition at line 326 of file system_efm32pg12b.c.

Variable Documentation

uint32_t SystemCoreClock

System System Clock Frequency (Core Clock).

(DO_NOT_INCLUDE_WITH_DOXYGEN)

Required CMSIS global variable that must be kept up-to-date.

Definition at line 100 of file system_efm32pg12b.c.

Referenced by SystemCoreClockGet().

uint32_t SystemHfrcoFreq = EFM32_HFRCO_STARTUP_FREQ

System HFRCO frequency.

Note

This is an EFM32 proprietary variable, not part of the CMSIS definition.

Frequency of the system HFRCO oscillator

Definition at line 113 of file system_efm32pg12b.c.

Referenced by CMU_HFRCOBandGet(), CMU_HFRCOBandSet(), and SystemHFClockGet().