system_lpc17xx.h

来自「LPCXpresso1768」· C头文件 代码 · 共 63 行

/******************************************************************************
 * @file:    system_LPC17xx.h
 * @purpose: CMSIS Cortex-M3 Device Peripheral Access Layer Header File
 *           for the NXP LPC17xx Device Series 
 * @version: V1.01
 * @date:    22. Jul. 2009
 *----------------------------------------------------------------------------
 *
 * Copyright (C) 2009 ARM Limited. All rights reserved.
 *
 * ARM Limited (ARM) is supplying this software for use with Cortex-M3 
 * processor based microcontrollers.  This file can be freely distributed 
 * within development tools that are supporting such ARM based processors. 
 *
 * THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
 * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
 * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
 * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
 *
 ******************************************************************************/


#ifndef __SYSTEM_LPC17xx_H
#define __SYSTEM_LPC17xx_H

#ifdef __cplusplus
 extern "C" {
#endif 

#include "type.h"
extern uint32_t SystemFrequency;    /*!< System Clock Frequency (Core Clock)  */


/**
 * Initialize the system
 *
 * @param  none
 * @return none
 *
 * @brief  Setup the microcontroller system.
 *         Initialize the System and update the SystemFrequency variable.
 */
extern void SystemInit (void);

/**
 * Determine the CPU Clock Frequency (SystemFrequency)
 *
 * @param none
 * @return none
 *
 * @brief	Function determines the microcontroller's CPU Clock frequency
 * 		It populates this value into the SystemFrequeny variable
 * 		This function should be used in main()
 */
extern void SystemClockUpdate (void);

#ifdef __cplusplus
}
#endif

#endif /* __SYSTEM_LPC17xx_H */