ext_int.rar_lpc2468

/***************************************************************************** * 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 <nxp/iolpc2468.h> #include "type.h" #include "irq.h" #include "target.h" #include <intrinsics.h> #define FIN (12<<6) //32.768khz~50mhz #define FCCO (288<<6) //275~500mhz #define RequireFreq (60<<6) /****************************************************************************** ** 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; IO0DIR = 0x00000000; IO1DIR = 0x00000000; FIO0DIR = 0x00000000; FIO1DIR = 0x00000000; FIO2DIR = 0x00000000; FIO3DIR = 0x00000000; FIO4DIR = 0x00000000; FIO0MASK = 0x00000000; FIO1MASK = 0x00000000; FIO2MASK = 0x00000000; FIO3MASK = 0x00000000; FIO4MASK = 0x00000000; SCS_bit.GPIOM = 0; //关闭0、1端口的高速IO功能 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 << 25) ) { 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 << 16); 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 << 26)) == 0) ); /* Check lock bit status */ 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 << 25)) == 0) ); /* Check connect bit status */ return; } void SET_PLL(){ unsigned int MValue, NValue; unsigned int MValue1, NValue1; NValue=1; MValue=FCCO*NValue/(2*FIN); //（1）若PLL被连接，用馈送序列断开与PLL连接。 if((PLLSTAT & (1 << 25)) == 1){ PLLCON &= 0xfffffffe; PLLFEED = 0xAA; PLLFEED = 0x55; } //（2）用馈送序列禁止PLL PLLCON &= 0xfffffffd; PLLFEED = 0xAA; PLLFEED = 0x55; //（3）主晶振使能，并选择主时钟作为PLL时钟源 SCS |= (1 << 5); while(SCS & (1 << 6) == 0);//等待主晶振稳定 CLKSRCSEL = 0x01; //（4）写PLLCFG，并用馈送序列使其有效 PLLCFG = (MValue-1) | ((NValue-1)<<16); PLLFEED = 0xAA; PLLFEED = 0x55; //（5）用一个馈送序列使能PLL PLLCON |= 0x01; PLLFEED = 0xAA; PLLFEED = 0x55; //(6)改变CPU时钟分频器设置使之与PLL一起操作 CCLKCFG = (FCCO / RequireFreq); //（7）通过监控PLLSTAT寄存器的PLOCK位来等待PLL实现锁定,变为1则表明锁定 while((PLLSTAT & ( 1<<26 )) == 0);//用（1<<26）而不用0x4000 MValue1 = PLLSTAT & 0x00007FFF; NValue1 = (PLLSTAT & 0x00FF0000) >> 16; while ((MValue1 != ( MValue-1 )) && ( NValue1 != ( NValue-1 )) ); //（8）用一个馈送序列连接PLL PLLCON |= 0x03; PLLFEED = 0xAA; PLLFEED = 0x55; while ( ((PLLSTAT & (1 << 25)) == 0) ); /* Check connect bit status */ 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) { /* Set memory accelerater module*/ MAMCR = 0; #if Fcclk < 20000000 MAMTIM = 3; #else #if Fcclk < 40000000 MAMTIM = 4; #else MAMTIM = 5; #endif #endif MAMCR = 2; #if USE_USB PCONP |= 0x80000000; /* Turn On USB PCLK */ #endif /* 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 /* Configure PLL, switch from IRC to Main OSC */ SET_PLL(); GPIOResetInit(); init_VIC(); return; } /****************************************************************************** ** End Of File ******************************************************************************/