LPC23XX ARM的驱动程序库
源代码在线查看： target.c
/*****************************************************************************
* target.c: Target C file for NXP LPC23xx/24xx Family Microprocessors
*
* Copyright(C) 2006, NXP Semiconductor
* All rights reserved.
*
* History
* 2006.07.13 ver 1.00 Prelimnary version, first Release
*
*****************************************************************************/
#include "LPC230x.h"
#include "type.h"
#include "irq.h"
#include "target.h"
/******************************************************************************
** Function name: TargetInit
**
** Descriptions: Initialize the target board; it is called in a necessary
** place, change it as needed
**
** parameters: None
** Returned value: None
**
******************************************************************************/
void TargetInit(void)
{
/* Add your codes here */
return;
}
/******************************************************************************
** Function name: GPIOResetInit
**
** Descriptions: Initialize the target board before running the main()
** function; User may change it as needed, but may not
** deleted it.
**
** parameters: None
** Returned value: None
**
******************************************************************************/
void GPIOResetInit( void )
{
/* Reset all GPIO pins to default: primary function */
PINSEL0 = 0x00000000;
PINSEL1 = 0x00000000;
PINSEL2 = 0x00000000;
PINSEL3 = 0x00000000;
PINSEL4 = 0x00000000;
PINSEL5 = 0x00000000;
PINSEL6 = 0x00000000;
PINSEL7 = 0x00000000;
PINSEL8 = 0x00000000;
PINSEL9 = 0x00000000;
PINSEL10 = 0x00000000;
IODIR0 = 0x00000000;
IODIR1 = 0x00000000;
IOSET0 = 0x00000000;
IOSET1 = 0x00000000;
FIO0DIR = 0x00000000;
FIO1DIR = 0x00000000;
FIO2DIR = 0x00000000;
FIO3DIR = 0x00000000;
FIO4DIR = 0x00000000;
FIO0SET = 0x00000000;
FIO1SET = 0x00000000;
FIO2SET = 0x00000000;
FIO3SET = 0x00000000;
FIO4SET = 0x00000000;
return;
}
/******************************************************************************
** Function name: ConfigurePLL
**
** Descriptions: Configure PLL switching to main OSC instead of IRC
** at power up and wake up from power down.
** This routine is used in TargetResetInit() and those
** examples using power down and wake up such as
** USB suspend to resume, ethernet WOL, and power management
** example
** parameters: None
** Returned value: None
**
******************************************************************************/
void ConfigurePLL ( void )
{
DWORD MValue, NValue;
if ( PLLSTAT & (1 {
PLLCON = 1; /* Enable PLL, disconnected */
PLLFEED = 0xaa;
PLLFEED = 0x55;
}
PLLCON = 0; /* Disable PLL, disconnected */
PLLFEED = 0xaa;
PLLFEED = 0x55;
SCS |= 0x20; /* Enable main OSC */
while( !(SCS & 0x40) ); /* Wait until main OSC is usable */
CLKSRCSEL = 0x1; /* select main OSC, 12MHz, as the PLL clock source */
PLLCFG = PLL_MValue | (PLL_NValue PLLFEED = 0xaa;
PLLFEED = 0x55;
PLLCON = 1; /* Enable PLL, disconnected */
PLLFEED = 0xaa;
PLLFEED = 0x55;
CCLKCFG = CCLKDivValue; /* Set clock divider */
#if USE_USB
USBCLKCFG = USBCLKDivValue; /* usbclk = 288 MHz/6 = 48 MHz */
#endif
while ( ((PLLSTAT & (1
MValue = PLLSTAT & 0x00007FFF;
NValue = (PLLSTAT & 0x00FF0000) >> 16;
while ((MValue != PLL_MValue) && ( NValue != PLL_NValue) );
PLLCON = 3; /* enable and connect */
PLLFEED = 0xaa;
PLLFEED = 0x55;
while ( ((PLLSTAT & (1 return;
}
/******************************************************************************
** Function name: TargetResetInit
**
** Descriptions: Initialize the target board before running the main()
** function; User may change it as needed, but may not
** deleted it.
**
** parameters: None
** Returned value: None
**
******************************************************************************/
void TargetResetInit(void)
{
#ifdef __DEBUG_RAM
MEMMAP = 0x2; /* remap to internal RAM */
#endif
#ifdef __DEBUG_FLASH
MEMMAP = 0x1; /* remap to internal flash */
#endif
#if USE_USB
PCONP |= 0x80000000; /* Turn On USB PCLK */
#endif
/* Configure PLL, switch from IRC to Main OSC */
ConfigurePLL();
/* Set system timers for each component */
#if (Fpclk / (Fcclk / 4)) == 1
PCLKSEL0 = 0x00000000; /* PCLK is 1/4 CCLK */
PCLKSEL1 = 0x00000000;
#endif
#if (Fpclk / (Fcclk / 4)) == 2
PCLKSEL0 = 0xAAAAAAAA; /* PCLK is 1/2 CCLK */
PCLKSEL1 = 0xAAAAAAAA;
#endif
#if (Fpclk / (Fcclk / 4)) == 4
PCLKSEL0 = 0x55555555; /* PCLK is the same as CCLK */
PCLKSEL1 = 0x55555555;
#endif
/* Set memory accelerater module*/
MAMCR = 0;
#if Fcclk < 20000000
MAMTIM = 1;
#else
#if Fcclk < 40000000
MAMTIM = 2;
#else
MAMTIM = 3;
#endif
#endif
MAMCR = 2;
GPIOResetInit();
init_VIC();
return;
}
/******************************************************************************
** End Of File
******************************************************************************/
