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system_LPC8xx.h
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system_LPC8xx.h
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/******************************************************************************
* @file: system_LPC8xx.h
* @purpose: CMSIS Cortex-M0+ Device Peripheral Access Layer Header File
* for the NXP LPC8xx Device Series
* @version: V1.0
* @date: 16. Aug. 2012
*----------------------------------------------------------------------------
*
* Copyright (C) 2012 ARM Limited. All rights reserved.
*
* ARM Limited (ARM) is supplying this software for use with Cortex-M0+
* 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_LPC8xx_H
#define __SYSTEM_LPC8xx_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdint.h>
/*
//-------- <<< Use Configuration Wizard in Context Menu >>> ------------------
*/
/*--------------------- Clock Configuration ----------------------------------
//
// <e> Clock Configuration
// <h> System Oscillator Control Register (SYSOSCCTRL)
// <o1.0> BYPASS: System Oscillator Bypass Enable
// <i> If enabled then PLL input (sys_osc_clk) is fed
// <i> directly from XTALIN and XTALOUT pins.
// <o1.9> FREQRANGE: System Oscillator Frequency Range
// <i> Determines frequency range for Low-power oscillator.
// <0=> 1 - 20 MHz
// <1=> 15 - 25 MHz
// </h>
//
// <h> Watchdog Oscillator Control Register (WDTOSCCTRL)
// <o2.0..4> DIVSEL: Select Divider for Fclkana
// <i> wdt_osc_clk = Fclkana/ (2 � (1 + DIVSEL))
// <0-31>
// <o2.5..8> FREQSEL: Select Watchdog Oscillator Analog Output Frequency (Fclkana)
// <0=> Undefined
// <1=> 0.5 MHz
// <2=> 0.8 MHz
// <3=> 1.1 MHz
// <4=> 1.4 MHz
// <5=> 1.6 MHz
// <6=> 1.8 MHz
// <7=> 2.0 MHz
// <8=> 2.2 MHz
// <9=> 2.4 MHz
// <10=> 2.6 MHz
// <11=> 2.7 MHz
// <12=> 2.9 MHz
// <13=> 3.1 MHz
// <14=> 3.2 MHz
// <15=> 3.4 MHz
// </h>
//
// <h> System PLL Control Register (SYSPLLCTRL)
// <i> F_clkout = M * F_clkin = F_CCO / (2 * P)
// <i> F_clkin must be in the range of 10 MHz to 25 MHz
// <i> F_CCO must be in the range of 156 MHz to 320 MHz
// <o3.0..4> MSEL: Feedback Divider Selection
// <i> M = MSEL + 1
// <0-31>
// <o3.5..6> PSEL: Post Divider Selection
// <0=> P = 1
// <1=> P = 2
// <2=> P = 4
// <3=> P = 8
// </h>
//
// <h> System PLL Clock Source Select Register (SYSPLLCLKSEL)
// <o4.0..1> SEL: System PLL Clock Source
// <0=> IRC Oscillator
// <1=> System Oscillator
// <2=> Reserved
// <3=> CLKIN pin
// </h>
//
// <h> Main Clock Source Select Register (MAINCLKSEL)
// <o5.0..1> SEL: Clock Source for Main Clock
// <0=> IRC Oscillator
// <1=> Input Clock to System PLL
// <2=> WDT Oscillator
// <3=> System PLL Clock Out
// </h>
//
// <h> System AHB Clock Divider Register (SYSAHBCLKDIV)
// <o6.0..7> DIV: System AHB Clock Divider
// <i> Divides main clock to provide system clock to core, memories, and peripherals.
// <i> 0 = is disabled
// <0-255>
// </h>
// </e>
*/
// 30 MHz main clock via PLL and internal RC oscillator
// According to the NXP tech support to access time of the internal flash
// is 24ns and zero waitstate access is still possible at 30 Mhz.
//
// PLL is set to 60 MHz
// AHBClkdiv divides the clock by 2
#define CLOCK_SETUP 1
#define SYSOSCCTRL_Val 0x00000000 // Reset: 0x000
#define WDTOSCCTRL_Val 0x00000000 // Reset: 0x000
#define SYSPLLCTRL_Val 0x00000024 // Reset: 0x000
#define SYSPLLCLKSEL_Val 0x00000000 // Reset: 0x000
#define MAINCLKSEL_Val 0x00000003 // Reset: 0x000
#define SYSAHBCLKDIV_Val 0x00000002 // Reset: 0x001
/*
//-------- <<< end of configuration section >>> ------------------------------
*/
/*----------------------------------------------------------------------------
Check the register settings
*----------------------------------------------------------------------------*/
#define CHECK_RANGE(val, min, max) ((val < min) || (val > max))
#define CHECK_RSVD(val, mask) (val & mask)
/* Clock Configuration -------------------------------------------------------*/
#if (CHECK_RSVD((SYSOSCCTRL_Val), ~0x00000003))
#error "SYSOSCCTRL: Invalid values of reserved bits!"
#endif
#if (CHECK_RSVD((WDTOSCCTRL_Val), ~0x000001FF))
#error "WDTOSCCTRL: Invalid values of reserved bits!"
#endif
#if (CHECK_RANGE((SYSPLLCLKSEL_Val), 0, 3))
#error "SYSPLLCLKSEL: Value out of range!"
#endif
#if (CHECK_RSVD((SYSPLLCTRL_Val), ~0x000001FF))
#error "SYSPLLCTRL: Invalid values of reserved bits!"
#endif
#if (CHECK_RSVD((MAINCLKSEL_Val), ~0x00000003))
#error "MAINCLKSEL: Invalid values of reserved bits!"
#endif
#if (CHECK_RANGE((SYSAHBCLKDIV_Val), 0, 255))
#error "SYSAHBCLKDIV: Value out of range!"
#endif
/*----------------------------------------------------------------------------
DEFINES
*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
Define clocks
*----------------------------------------------------------------------------*/
#define __XTAL (12000000UL) /* Oscillator frequency */
#define __SYS_OSC_CLK ( __XTAL) /* Main oscillator frequency */
#define __IRC_OSC_CLK (12000000UL) /* Internal RC oscillator frequency */
#define __CLKIN_CLK (12000000UL) /* CLKIN pin frequency */
#define __FREQSEL ((WDTOSCCTRL_Val >> 5) & 0x0F)
#define __DIVSEL (((WDTOSCCTRL_Val & 0x1F) << 1) + 2)
#if (CLOCK_SETUP) /* Clock Setup */
#if (__FREQSEL == 0)
#define __WDT_OSC_CLK ( 0) /* undefined */
#elif (__FREQSEL == 1)
#define __WDT_OSC_CLK ( 500000 / __DIVSEL)
#elif (__FREQSEL == 2)
#define __WDT_OSC_CLK ( 800000 / __DIVSEL)
#elif (__FREQSEL == 3)
#define __WDT_OSC_CLK (1100000 / __DIVSEL)
#elif (__FREQSEL == 4)
#define __WDT_OSC_CLK (1400000 / __DIVSEL)
#elif (__FREQSEL == 5)
#define __WDT_OSC_CLK (1600000 / __DIVSEL)
#elif (__FREQSEL == 6)
#define __WDT_OSC_CLK (1800000 / __DIVSEL)
#elif (__FREQSEL == 7)
#define __WDT_OSC_CLK (2000000 / __DIVSEL)
#elif (__FREQSEL == 8)
#define __WDT_OSC_CLK (2200000 / __DIVSEL)
#elif (__FREQSEL == 9)
#define __WDT_OSC_CLK (2400000 / __DIVSEL)
#elif (__FREQSEL == 10)
#define __WDT_OSC_CLK (2600000 / __DIVSEL)
#elif (__FREQSEL == 11)
#define __WDT_OSC_CLK (2700000 / __DIVSEL)
#elif (__FREQSEL == 12)
#define __WDT_OSC_CLK (2900000 / __DIVSEL)
#elif (__FREQSEL == 13)
#define __WDT_OSC_CLK (3100000 / __DIVSEL)
#elif (__FREQSEL == 14)
#define __WDT_OSC_CLK (3200000 / __DIVSEL)
#else
#define __WDT_OSC_CLK (3400000 / __DIVSEL)
#endif
/* sys_pllclkin calculation */
#if ((SYSPLLCLKSEL_Val & 0x03) == 0)
#define __SYS_PLLCLKIN (__IRC_OSC_CLK)
#elif ((SYSPLLCLKSEL_Val & 0x03) == 1)
#define __SYS_PLLCLKIN (__SYS_OSC_CLK)
#elif ((SYSPLLCLKSEL_Val & 0x03) == 3)
#define __SYS_PLLCLKIN (__CLKIN_CLK)
#else
#define __SYS_PLLCLKIN (0)
#endif
#define __SYS_PLLCLKOUT (__SYS_PLLCLKIN * ((SYSPLLCTRL_Val & 0x01F) + 1))
/* main clock calculation */
#if ((MAINCLKSEL_Val & 0x03) == 0)
#define __MAIN_CLOCK (__IRC_OSC_CLK)
#elif ((MAINCLKSEL_Val & 0x03) == 1)
#define __MAIN_CLOCK (__SYS_PLLCLKIN)
#elif ((MAINCLKSEL_Val & 0x03) == 2)
#if (__FREQSEL == 0)
#error "MAINCLKSEL: WDT Oscillator selected but FREQSEL is undefined!"
#else
#define __MAIN_CLOCK (__WDT_OSC_CLK)
#endif
#elif ((MAINCLKSEL_Val & 0x03) == 3)
#define __MAIN_CLOCK (__SYS_PLLCLKOUT)
#else
#define __MAIN_CLOCK (0)
#endif
#define __SYSTEM_CLOCK (__MAIN_CLOCK / SYSAHBCLKDIV_Val)
#else
#define __SYSTEM_CLOCK (__IRC_OSC_CLK)
#endif // CLOCK_SETUP
extern uint32_t SystemCoreClock; /*!< System Clock Frequency (Core Clock) */
/**
* Initialize the system
*
* @param none
* @return none
*
* @brief Setup the microcontroller system.
* Initialize the System and update the SystemCoreClock variable.
*/
extern void SystemInit (void);
/**
* Update SystemCoreClock variable
*
* @param none
* @return none
*
* @brief Updates the SystemCoreClock with current core Clock
* retrieved from cpu registers.
*/
extern void SystemCoreClockUpdate (void);
#ifdef __cplusplus
}
#endif
#endif /* __SYSTEM_LPC8xx_H */