2138-LED-Sample.rar_LPC2138 LED_lpc2138 实例_嵌入式

#include "iolpc2138.h" #include "generic.h" #include "lpc2138.h" #define LED 0x80000000 void pll_init() { PLLCON = 1;//active and keep in disconnect #if (Fpclk/(Fcclk/4)) == 1 VPBDIV = 0; // 00 -- Fpclk = 1/4Fcclk, 01 -- Fpclk = Fcclk, 10 -- Fpclk = 1/2Fcclk #endif #if (Fpclk/(Fcclk/4)) == 2 VPBDIV = 2; #endif #if (Fpclk/(Fcclk/4)) == 4 VPBDIV = 1; #endif #if (Fcco/Fcclk) == 2 PLLCFG = ((Fcclk/Fosc) - 1) | (0 << 5); #endif #if (Fcco/Fcclk) == 4 PLLCFG = ((Fcclk/Fosc) - 1) | (1 << 5); #endif #if (Fcco/Fcclk) == 8 PLLCFG = ((Fcclk/Fosc) - 1) | (2 << 5); #endif #if (Fcco/Fcclk) == 16 PLLCFG = ((Fcclk/Fosc) - 1) | (3 << 5); #endif PLLFEED = 0xAA; PLLFEED = 0x55; while((PLLSTAT & (1 << 10)) == 0); PLLCON = 3; //connect and active PLLFEED = 0xAA; PLLFEED = 0x55; } static void BSP_PLL_Init (void) { U16 loop_ctr; /* Configure PLL0, which determines the CPU clock */ PLLCFG = 0x00000003; /* Use PLL values of M = 4 and P = 2 */ PLLCON |= 0x00000001; /* Set the PLL Enable bit */ PLLFEED = 0xAA; /* Write to the PLL Feed register */ PLLFEED = 0x55; loop_ctr = 10000; /* Wait for the PLL to lock into the new frequency */ while (((PLLSTAT_bit.PLOCK) == 0) && (loop_ctr > 0)) { loop_ctr--; } PLLCON |= 0x00000002; /* Connect the PLL */ PLLFEED = 0xAA; /* Write to the PLL Feed register */ PLLFEED = 0x55; VPBDIV = 0x00000002; /* Set the VPB frequency to one-half of the CPU clock */ } void delay(U32 dly) { U32 i; for(; dly > 0; dly--) for(i=0; i < 10; i++); } int main() { BSP_PLL_Init(); PINSEL0 &= 0x3FFFFFFF; IO0DIR = LED; while(1) { IO0SET = LED; delay(50000); delay(50000); IO0CLR = LED; delay(50000); delay(50000); } }