查询实现UART0与上位机的通信(IAR+LPC2148).rar

#include <iolpc2148.h> #include "system.h" #define VIC_TIMER0_bit (1 << VIC_TIMER0) // 根据电路板上晶振设置振荡器频率 //#define OSCILLATOR_CLOCK_FREQUENCY 14745600 //in MHz #define OSCILLATOR_CLOCK_FREQUENCY 12000000 //in MHz unsigned int GetCclk(void) // 获得实际处理器时钟频率 { return OSCILLATOR_CLOCK_FREQUENCY * (PLLCON & 1 ? (PLLCFG & 0xF) + 1 : 1); } //获得外围功能时钟频率 unsigned int GetPclk(void) { unsigned int divider; switch (VPBDIV & 3) { case 0: divider = 4; break; case 1: divider = 1; break; case 2: divider = 2; break; } return GetCclk() / divider; } //相乘或相除，这里是计算锁相环频率 void FrecInit(void) { PLLCFG_bit.MSEL = 0x2; //M - 相乘 PLLCFG_bit.PSEL = 0x1; //P - 相除 PLLFEED_bit.FEED = 0xAA; //更改设置 PLLFEED_bit.FEED = 0x55; PLLCON_bit.PLLE = 1; //允许 PLL PLLFEED_bit.FEED = 0xAA; //更改设置 PLLFEED_bit.FEED = 0x55; while (PLLSTAT_bit.PLOCK == 0); //等待PLOK稳定 PLLCON_bit.PLLC = 1; //连接 PLL PLLFEED_bit.FEED = 0xAA; //更改设置 PLLFEED_bit.FEED = 0x55; }