LPC2132 串口中断通信

左耳 · 发表于 2016-5-20 23:46:03

#include <stdio.h>
#include "LPC213X.h"                      /* LPC21xx definitions */

/*----------------------------------------------------------*\
| TYPE DEFINE                                           |
\*----------------------------------------------------------*/
typedef char             S8;
typedef unsigned char    U8;
typedef short             S16;
typedef unsigned short    U16;
typedef int             S32;
typedef unsigned int    U32;
typedef long long       S64;
typedef unsigned long long U64;
typedef unsigned char    BIT;
typedef unsigned int    BOOL;

#define Fosc (12000000) //晶振频率,10MHz~25MHz，应当与实际一至
#define Fcclk (Fosc * 5) //60M 系统频率，必须为Fosc的整数倍(1~32)，且<=70MHZ
#define Fcco (Fcclk * 4) //CCO频率，必须为Fcclk的2、4、8、16倍，范围为156MHz~320MHz
#define Fpclk (Fcclk / 4) * 1 //016.5888,VPB时钟频率，只能为(Fcclk / 4)的1 ~ 4倍

U8 recver_buffer[14];
U8 rcv_new;
U32 GetNum;

/*----------------------------------------------------------*\
| Delay ns                                              |
\*----------------------------------------------------------*/
void DelayNS (U32 dly) {
      U32 i;

      for ( ; dly>0; dly--)
            for (i=0; i<500; i++);

      }
/*----------------------------------------------------------*\
| UART0 Initial                                           |
\*----------------------------------------------------------*/
void  UART0_init(void)       {
//       unsigned short int fdiv;

      PINSEL0 |= 0x00000005;             // 设置I/O连接到UART0

      U0LCR = 0x83;                      // DLAB = 1，可设置波特率
      U0DLM = 0x00;
      U0DLL = 0x47;
      U0FDR = 0x83;
      U0LCR = 0x03;
      }

/*----------------------------------------------------------*\
| PLL init                                        |
\*----------------------------------------------------------*/
void PLL_Init(void)
{


while (!(PLLSTAT & 0x00000400)) ; // test Lock bit  判断PLOCK 为锁定？1锁定到制定的频lv
      PLLCFG = 0x00000024;          // Set multiplier and divider of PLL to give ;CCLK=60MHz; P=2,M=5
PLLCON = 0x00000003; // Connect the PLL PLL连接和PLL使能 PLL控制寄存器
PLLFEED = 0x000000AA; //Update PLL registers
PLLFEED = 0x00000055; //PL馈送寄存器
VPBDIV = 0x00000000;    //设置VPB总线时钟为处理器时钟(cclk)的1/4 = 15M

}

/*----------------------------------------------------------*\
| UART0 Send Char                                        |
\*----------------------------------------------------------*/
void  UART0_PutCh(unsigned char Ch)       {
      U0THR = Ch;                         // 发送数据
      while( (U0LSR&0x40)==0 );       // 等待数据发送完毕
      DelayNS(5);
      }

/*----------------------------------------------------------*\
| UART0 Send String                                     |
\*----------------------------------------------------------*/
void  UART0_PutStr(unsigned char const *str,unsigned int SendNum) {
      unsigned int i;
      for(i=0;i<SendNum;i++)
                     UART0_PutCh(*str++);
}

/*----------------------------------------------------------*\
| UART1 Get Byte                                        |
\*----------------------------------------------------------*/
U8 UART0_GetByte (void) {
      U8 rcv_dat;
      while ((U0LSR & 0x01) == 0);
      rcv_dat = U0RBR;
      return (rcv_dat);
      }
/*----------------------------------------------------------*\
| UART1 Get String                                        |
\*----------------------------------------------------------*/
void UART0_GetStr(U8 *s) {
      while( (*s = UART0_GetByte()) != '\n' ) s++;
      }

/***********UART0中断接收程序***********/
void IRQ_UART0(void) __irq
{
GetNum = 0;

while ((U0IIR & 0x01) == 0){                                     /*  判断是否有中断挂起       */
      switch (U0IIR & 0x0E){

                     case 0x06:                //发生RLS中断,读U0LSR中断复位
                  break;

            case 0x04:                                                 /*  接收数据可用中断*/
                  rcv_new = 1;                                           /*  置接收新数据标志 */
                  for (GetNum = 0; GetNum < 14; GetNum++)                               /*  连续接收14个字节  */
                              {
                     recver_buffer[GetNum] = U0RBR;
                        }
                  break;

         case 0x0C:                                              /*  字符超时中断             */
            rcv_new = 1;
            while ((U0LSR & 0x01) == 0x01)                               /*  判断数据是否接收完毕 */
                              {
                  recver_buffer[GetNum] = U0RBR;
                  GetNum++;
            }
            break;

            case 0x02:       //发生THRE中断,读U0IIR或写U0THR中断复位
                  break;

         default:
            break;
      }
}

      VICVectAddr = 0x00;       //清除中断

}
void IRQEnable(void)

{
int temp;
__asm
      {
            MRS temp,CPSR
            BIC temp,temp,#0x80
            MSR CPSR_c,temp
      }
}

void Interrupt_Init (void)

{
      VICIntSelect = 0x00000000;          // 设置所有通道为IRQ中断 ,置1为FIQ中断，置0为IRQ中断
         VICVectCntl0 = (0x20 | 6);          // UART0中断通道分配到IRQ slot0 即获得最高中断优先级
         VICVectAddr0 = (int)IRQ_UART0;       // 设置UART0向量地址
         VICIntEnable = 1 << 6;             // 使能串口UART0中断
}

/*----------------------------------------------------------*\
| MAIN ENTRY                                              |
\*----------------------------------------------------------*/
int main(void) {
      U0FCR = 0xC7;                      // 使能FIFO，并设置触发点为14
U0IER = 0x07;                      // 允许RBR中断，即接收中断
      rcv_new = 1;
      PLL_Init();
UART0_init();       //串口初始化

      Interrupt_Init(); //中断向量初始化
      while(1)
      {

            if(rcv_new == 1)
            {
                     rcv_new = 0;
                     UART0_PutStr(recver_buffer,3);
            }

      }
}
/*----------------------------------------------------------*\
| END OF FILE                                           |
\*----------------------------------------------------------*/