用lpc2114的p0.10的捕获功能,检测输入信号的频率是否在正常的范围内,通过UART0输出结果(1为正确,0为错),可是通过串口助手接到的数据是乱码,大侠门看下程序,指点下,万分感谢!
extern long ztimeval; /* LPC21xx definitions */
extern long timeval; // count up in 1mSec
extern long tSec ; // count up in 1 sec
void initCPU_IO(void);
int main (void)
{
////////////////// System Initialize
initCPU_IO();//此函數內有"init_timer()"這個函數
///////////////// The Main Loop
while (1){ /* Loop forever */
}
}
************************************************************
#include <string.h>
#include <LPC21XX.H> // LPC21XX Peripheral Registers
#include "Timer.h"
// Timer0 count
#define CNT_T0MR0_D 58622 // 1mSec = 58622 counts
long tSec ; //sec
long ztSec;
long timeval; // count up in 1mSec
long ztimeval;
long ztxtimeval;
int A;
int E;
void tc0(void) __irq //_irq--> 例外管理程序
{
/// 0. Processing Timer, generate tSec timer value
T0IR = 1; // Clear interrupt flag, Clear interrupt flag on MR0-->Match Channel 0;MR0可開始接受中斷(避免中斷失效);T0IR由0x00000001-->0x00000000
VICVectAddr = 0; // Acknowledge Interrupt
++timeval;
if ( (timeval - ztimeval) >= 1000 )
{ // reach 1 Sec
++tSec;
ztimeval=timeval;
E=20*A;
if (E<1)
{
/
U0THR=0;
}
else
{
if ((E<=3579620)&&(E>=3579460))
{
U0THR=1;
}
else
{
if ((E<=4433720)&&(E>=4433520))
{
U0THR=1;
}
else
{
//lcd_dec7(E);
//lcd_goto(2,15);
//lcd_puts("NG");
U0THR=1;
}
}
}
}
}
void t1cap0 (void) __irq
{
if(T1IR&0x10)
{
T1IR = 0x10;
VICVectAddr=0;
T1MR0=59029500;
A++;
}
}
/* Setup the Timer Counter 0,1 Interrupt */
void init_timer (void) {
T0MR0 = CNT_T0MR0_D; // 1ms , T0MR0 = 58621
T0MCR = 3; // Interrupt and Reset on MR0(即T0TC=T0MR0時,T0TC會中斷並Reset為0)
VICVectAddr0 = (unsigned long) tc0; //
VICVectCntl0 = 0x20 |4 ; // use it for Timer 0 Interrupt ,"VICVectCntl0 = 0x20"-->將向量IRQ Slot0 Enable,決定向量中斷(IRQ Slot)優先權為Slot0
T0TCR = 1; // Timer0 Enable
VICIntEnable = 0x00000010; // Enable Timer0(MR0~3及CR0~3) Interrupt,VIC bit 4=1(VICIntEnable = 0x00000010=00000000000000000000000000010000),設定中斷源為Timer0
PINSEL0 |= (2<<20); //p0.10 as CAP1.0
T1CCR = 5; // Capture and Interrupt CAP1.0, rising and
T1MCR = 3;
//Interrupt on MR0(令T1TC=T1MR0時,產生中斷) but no reset TCR
VICVectAddr1 = (unsigned long)t1cap0; // set interrupt vector in 1
VICVectCntl1 = 0x20 | 5;
// use it for Timer 1 Interrupt,決定向量中斷(IRQ Slot)優先權為Slot1
T1TCR = 1;
T1IR=0x01; // Timer1 Enable
VICIntEnable = 0x20; // Enable Timer1(MR0~3及CR0~3) Interrupt,此行 VICVectAddr1的內容正好複製到VICVectAddr(VICVectAddr1的內容=VICVectAddr的內容),表示開始執行向量IRQ中斷;剛開機時回先從這行執行中斷,因T1MR0=0=T1TC,而T0TC須等T0TC=58621時,T0TC才會中斷(此時才會令VICVectAddr0的內容=VICVectAddr的內容)
timeval=ztimeval=ztxtimeval=0;
tSec=ztSec=0xf0;
tcapNew=0;
}
void initCPU_IO(void)
{
VPBDIV = 1; /* set IO clock, VPB clock=58.8924Mhz same as CCLK */ //VPBDIV=1,pclk=cclk,因PLLCFG=0x27,所以P=2,M=8,故cclk=M*石英振盪=8*7.3728=58.8924MHz=processor的clock頻率
PINSEL0 |= 0x00050005 ; /* Enable RxD0,1 & TxD0,1 */
/* initialize the serial interface */
U0LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */
U0DLL = 32; /* 115200 Baud Rate */
U0DLM = 0;
U0LCR = 0x03; /* DLAB = 0 */
U0FCR = 0x01; /* Enable FIFO */
init_timer();
}
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