lpc176x_clk.c File Reference

#include <stdint.h>
#include <cfg/arch.h>
#include <arch/cm3.h>
#include <arch/cm3/timer.h>
#include <arch/cm3/nxp/lpc176x_clk.h>
#include <cfg/clock.h>
#include <arch/cm3/nxp/lpc176x.h>

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Defines
#define	CLOCK_SETUP   1
#define	SCS_Val   0x00000020
#define	CLKSRCSEL_Val   0x00000001
#define	PLL0_SETUP   1
#define	PLL0CFG_Val   0x00050063
#define	PLL1_SETUP   1
#define	PLL1CFG_Val   0x00000023
#define	CCLKCFG_Val   0x00000003
#define	USBCLKCFG_Val   0x00000000
#define	PCLKSEL0_Val   0x00000000
#define	PCLKSEL1_Val   0x00000000
#define	PCONP_Val   0x042887DE
#define	CLKOUTCFG_Val   0x00000000
#define	FLASH_SETUP   1
#define	FLASHCFG_Val   0x00004000
#define	CHECK_RANGE(val, min, max)   ((val < min) || (val > max))
#define	CHECK_RSVD(val, mask)   (val & mask)
#define	__M   (((PLL0CFG_Val ) & 0x7FFF) + 1)
#define	__N   (((PLL0CFG_Val >> 16) & 0x00FF) + 1)
#define	__FCCO(__F_IN)   ((2 * __M * __F_IN) / __N)
#define	__CCLK_DIV   (((CCLKCFG_Val ) & 0x00FF) + 1)
#define	__CORE_CLK   (__FCCO(OSC_CLK) / __CCLK_DIV)
Functions
void	SystemCoreClockUpdate (void)
int	SetSysClock (void)
	Update SystemCoreClock according to Clock Register Values.
uint32_t	SysCtlClockGet (void)
	requests System clock frequency
uint32_t	Lpc17xx_ClockGet (int idx)
	requests frequency of the given clock
Variables
uint32_t	SystemCoreClock = __CORE_CLK
uint32_t	USBClock = (48000000UL)

---

Define Documentation

#define CLOCK_SETUP   1

#define SCS_Val   0x00000020

Referenced by SetSysClock().

#define CLKSRCSEL_Val   0x00000001

Referenced by SetSysClock().

#define PLL0_SETUP   1

#define PLL0CFG_Val   0x00050063

Referenced by SetSysClock().

#define PLL1_SETUP   1

#define PLL1CFG_Val   0x00000023

Referenced by SetSysClock().

#define CCLKCFG_Val   0x00000003

Referenced by SetSysClock().

#define USBCLKCFG_Val   0x00000000

Referenced by SetSysClock().

#define PCLKSEL0_Val   0x00000000

Referenced by SetSysClock().

#define PCLKSEL1_Val   0x00000000

Referenced by SetSysClock().

#define PCONP_Val   0x042887DE

Referenced by SetSysClock().

#define CLKOUTCFG_Val   0x00000000

Referenced by SetSysClock().

#define FLASH_SETUP   1

#define FLASHCFG_Val   0x00004000

Referenced by SetSysClock().

#define CHECK_RANGE	(		val,
			min,
			max
	)		((val < min) || (val > max))

#define CHECK_RSVD	(		val,
			mask
	)		(val & mask)

#define __M   (((PLL0CFG_Val ) & 0x7FFF) + 1)

#define __N   (((PLL0CFG_Val >> 16) & 0x00FF) + 1)

#define __FCCO

(

__F_IN

)

((2 * __M * __F_IN) / __N)

#define __CCLK_DIV   (((CCLKCFG_Val ) & 0x00FF) + 1)

#define __CORE_CLK   (__FCCO(OSC_CLK) / __CCLK_DIV)

---

Function Documentation

int SetSysClock

(

void

)

Update SystemCoreClock according to Clock Register Values.

This function reads out the CPUs clock and PLL registers and assembles the actual clock speed values into the SystemCoreClock global variable. Sets System clock frequency to the configured defaults.

Note:

This function should be used only after reset.

Parameters:

None

Return values:

None

References CCLKCFG_Val, CLKOUTCFG_Val, CLKSRCSEL_Val, FLASHCFG_Val, LPC_SC, PCLKSEL0_Val, PCLKSEL1_Val, PCONP_Val, PLL0CFG_Val, PLL1CFG_Val, rc, SCS_Val, SystemCoreClockUpdate(), and USBCLKCFG_Val.

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uint32_t SysCtlClockGet

(

void

)

requests System clock frequency

Note:

This function should be used only after reset.

Parameters:

None

Return values:

None

References SystemCoreClock, and SystemCoreClockUpdate().

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uint32_t Lpc17xx_ClockGet

(

int

idx

)

requests frequency of the given clock

Parameters:

idx	NUT_HWCLK Index

Return values:

clock

or 0 if idx points to an invalid clock

References NUT_HWCLK_CPU, SystemCoreClock, SystemCoreClockUpdate(), and USBClock.

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Variable Documentation

uint32_t USBClock = (48000000UL)

USB Clock Frequency - this value will be updated after call SystemCoreClockUpdate, should be 48MHz

Referenced by Lpc17xx_ClockGet(), and SystemCoreClockUpdate().