用半主机方式调试---PWM捕捉定时器小练。

#include <stdio.h> 

#include "NUC1xx.h"

#include "Driver\DrvSYS.h"

#include "Driver\DrvGPIO.h"

#include "Driver\DrvUART.h"

#define PWM_CNR 0xFFFF

uint16_t CaptureCounter=0;

uint32_t CaptureValue[2];

void InitCapture(void)

{

/* Step 1. GPIO initial */ 

SYS->GPAMFP.PWM0_AD13=1; 

/* Step 2. Enable and Select PWM clock source*/ 

SYSCLK->APBCLK.PWM01_EN = 1;//Enable PWM clock

SYSCLK->CLKSEL1.PWM01_S = 0;//Select 12Mhz for PWM clock source

PWMA->;PPR.CP01=11; //Prescaler 0~255, Setting 0 to stop output clock

PWMA->CSR.CSR0=100; //clock divider->0:/2, 1:/4, 2:/8, 3:/16, 4:/1

//计数时基1us 

/* Step 3. Select PWM Operation mode */

PWMA->;PCR.CH0MOD=1; //0:One-shot mode, 1:Auto-load mode

//CNR and CMR will be auto-cleared after setting CH0MOD form 

0 to 1.

PWMA->CNR0=PWM_CNR; //Set Reload register

PWMA->CAPENR=1; //Enable Capture function pin

PWMA->CCR0.CAPCH0EN=1; //Enable Capture function

/* Step 4. Set PWM Interrupt */

PWMA->CCR0.CRL_IE0=1; //Enable Capture rising edge interrupt

PWMA->CCR0.CFL_IE0=1; //Enable Capture falling edge interrupt

PWMA->;PIER.PWMIE0=1; //Enable PWM interrupt for down-counter equal zero.

NVIC_EnableIRQ(PWMA_IRQn); //enable PWM inturrupt

/* Step 5. Enable PWM down counter*/

PWMA->;PCR.CH0EN=1; //Enable PWM down counter

}

//--------------------------------------------

void InitPWM1(void)

{

/* Step 1. GPIO initial */ 

SYS->GPAMFP.PWM1_AD14=1;

/* Step 2. Enable and Select PWM clock source*/ 

SYSCLK->APBCLK.PWM01_EN = 1;//Enable PWM clock

SYSCLK->CLKSEL1.PWM01_S = 0;//Select 12Mhz for PWM clock source

//主时钟在进入PWM定时器之前被(CP01+1)分频　

PWMA->;PPR.CP01=11; //Prescaler 0~255, Setting 0 to stop output clock

//PWM定时器16分频

PWMA->CSR.CSR1=3; // PWM clock = clock source/(Prescaler + 1)/divider

//clock divider->0:/2, 1:/4, 2:/8, 3:/16, 4:/1

//PWM定时器每计数一个时间:12M/(11+1)*16=16us 

/* Step 3. Select PWM Operation mode */

//PWM0 自动重装载模式

PWMA->;PCR.CH1MOD=1; //0:One-shot mode, 1:Auto-load mode

//CNR and CMR will be auto-cleared after setting CH0MOD form 

0 to 1.

PWMA->CNR1=0xFFFF; //周期 65535*16=1.048560S

PWMA->CMR1=0x3FFF; //占空比=(CMR+1)/(CNR+1)

PWMA->;PCR.CH1INV=0; //Inverter->0:off, 1:on PWM输出极性反转

PWMA->;PCR.CH1EN=1; //PWM function->0:Disable, 1:Enable

PWMA->;POE.PWM1=1; //Output to pin->0:Diasble, 1:Enable

}

void PWMA_IRQHandler(void) // PWM interrupt subroutine 

{

if(PWMA->;PIIR.PWMIF0)

{

CaptureCounter++;//Delay (PWM_CNR+1) usec

if(CaptureCounter==0)

{

//Overflow

}

PWMA->;PIIR.PWMIF0=1;

}

if(PWMA->CCR0.CAPIF0)

{

if(PWMA->CCR0.CFLRI0)//Calculate High Level

{

CaptureValue[0]=CaptureCounter*(PWM_CNR+1)+(PWM_CNR-PWMA->CFLR0);//usec

CaptureCounter=0;

PWMA->CCR0.CFLRI0=0;

}

if(PWMA->CCR0.CRLRI0)//Calculate Low Level

{

CaptureValue[1]=CaptureCounter*(PWM_CNR+1)+(PWM_CNR-PWMA->CRLR0);//usec

CaptureCounter=0;

PWMA->CCR0.CRLRI0=0; 

}

PWMA->CCR0.CAPIF0=1;

}

}



void Delay(int count)

{

while(count--)

{

//__NOP;

}

}

/*----------------------------------------------------------------------------

MAIN function

----------------------------------------------------------------------------*/

int32_t main (void)

{

STR_UART_T sParam;

/* Unlock the protected registers */ 

UNLOCKREG();

/* Enable the 12MHz oscillator oscillation */

DrvSYS_SetOscCtrl(E_SYS_XTL12M, 1);



/* Waiting for 12M Xtal stalble */

DrvSYS_Delay(5000);



/* HCLK clock source. 0: external 12MHz; 4:internal 22MHz RC oscillator */

DrvSYS_SelectHCLKSource(0); 

/*lock the protected registers */

LOCKREG(); 

DrvSYS_SetClockDivider(E_SYS_HCLK_DIV, 0); /* HCLK clock frequency = HCLK clock source / (HCLK_N + 1) */

/* Set UART Pin */

DrvGPIO_InitFunction(E_FUNC_UART0);

/* UART Setting */

sParam.u32BaudRate = 115200;

sParam.u8cDataBits = DRVUART_DATABITS_8;

sParam.u8cStopBits = DRVUART_STOPBITS_1;

sParam.u8cParity = DRVUART_PARITY_NONE;

sParam.u8cRxTriggerLevel= DRVUART_FIFO_1BYTES;

/* Set UART Configuration */

if(DrvUART_Open(UART_PORT0,&sParam) != E_SUCCESS)

{

printf("UART0 open failed\n");

return FALSE;

}



InitPWM1();

InitCapture();

printf("================================================\n\r");

printf(" 菜农新唐M0助学板范例 \n\r");

printf(" 实验八： 捕捉定时器试验 　\n\r");

printf(" 烈火狂龙 论坛ID: plc_avr \n\r");

printf("================================================\n\r");

while(1)

{



if(CaptureValue[0]>=1000000)

{

printf("高电平时间:%dsec\n",CaptureValue[0]/1000000);

}

else if(CaptureValue[0]>=1000)

{

printf("高电平时间:%dmsec\n",CaptureValue[0]/1000);

}

else 

printf("高电平时间:%dusec\n",CaptureValue[0]);



if(CaptureValue[1]>=1000000)

{

printf("低电平时间:%dsec\n",CaptureValue[1]/1000000);

}

else if(CaptureValue[1]>=1000)

{

printf("低电平时间:%dmsec\n",CaptureValue[1]/1000);

} 

else 

printf("低电平时间:%dusec\n",CaptureValue[1]); 



DrvSYS_Delay(500000); 

} 

}