PWM逻辑分析仪图

#include <stdio.h>

#include "NUC1xx.h"

#include "Driver\DrvGPIO.h"

#include "Driver\DrvSYS.h"

#include "Driver\DrvUART.h"

#include "Driver\DrvTIMER.h"

#include "Driver\DrvPWM.h"





#define Run_Led 2 //2----LED1 3----LED2 4----LED3 5----LED4



volatile uint8_t PWM0_Duty_Cycle = 50; //PWM占空比



/***************

** 函数声明 **

***************/

void Init_System (void);

void Init_Uart (void);

void Init_PWM0(void);



void UART_INT_HANDLE(uint32_t u32IntStatus);





void Init_System(void)

{

/* Unlock the locked registers before access */

UNLOCKREG(x); //寄存器锁定键地址寄存器(RegLockAddr) :有些系统控制寄存器需要被保护起来，以防止误操作而影响芯片运行，

//这些寄存器在上电复位到用户解锁定之前是锁定的。用户可以连续依次写入“59h”, “16h” “88h”到0x5000_0100解锁定. 



/* Enable the 12MHz oscillator oscillation */

//确定时钟

DrvSYS_SetOscCtrl(E_SYS_XTL12M, 1); //SYSCLK->PWRCON.XTL12M_EN = 1;



/* Waiting for 12M Xtal stable */

//while (DrvSYS_GetChipClockSourceStatus(E_SYS_XTL12M) != 1); //SYSCLK->CLKSTATUS.XTL12M_STB

/*eClkSrc - [in] E_SYS_XTL12M / E_SYS_XTL32K / E_SYS_OSC22M / E_SYS_OSC10K / E_SYS_PLL */

// Note: Only some of NuMicro NUC100 Series support this function.

DrvSYS_Delay(5000);



LOCKREG(x);

//向“0x5000_0100”写入任何值，就可以重锁保护寄存器 

}







void Init_PWM0(void)

{

S_DRVPWM_TIME_DATA_T sPt;

/*

声明 PWM Timer设置的结构体 位于DRVPWM.H 

结构体如下:

typedef struct

{

uint8_t u8Mode;

uint8_t u8HighPulseRatio;

uint8_t u8ClockSelector;

uint8_t u8PreScale;

uint32_t u32Frequency; 

uint32_t u32Duty;

int32_t i32Inverter;

}S_DRVPWM_TIME_DATA_T;

*/



/* PWM Timer property */ 

sPt.u8Mode = DRVPWM_AUTO_RELOAD_MODE; /*自动重载模式 DRVPWM_ONE_SHOT_MODE为单触发模式*/ 

sPt.u32Frequency = 400; /*PWM 频率 为400HZ即2500us为一周期*/ 

sPt.u8HighPulseRatio = PWM0_Duty_Cycle; /* 高脉冲宽度 : 总脉冲宽度 = 1 : 100 */ 

sPt.i32Inverter = 0; /*反向关闭*/



/* Enable PWM clock */

DrvPWM_Open();//使能PWM clock时钟函数



/* Select PWM engine clock */

DrvPWM_SelectClockSource(DRVPWM_TIMER0, DRVPWM_EXT_12M);



/* Set PWM Timer0 Configuration */

DrvPWM_SetTimerClk(DRVPWM_TIMER0, &sPt); //将配置好的参数赋值寄存器函数



/* Enable Output for PWM Timer0 */

DrvPWM_SetTimerIO(DRVPWM_TIMER0, 1);//使能定时器输出



/* Set PWM pins */

DrvGPIO_InitFunction(E_FUNC_PWM01);//选出PWM的输出脚



/* Enable the PWM Timer 0 */

DrvPWM_Enable(DRVPWM_TIMER0, 1);//使能PWM定时器0

}



void delay_1s()

{

uint32_t i;

for(i = 0; i < 200; i++)

{

DrvSYS_Delay(1000);

}

}







int main (void)

{

Init_System(); //初始化系统



Init_PWM0();//初始化PWM0



DrvGPIO_Open(E_GPA,Run_Led, E_IO_OUTPUT);//程序运行指示,设置LED1OUTPUT

DrvGPIO_ClrBit(E_GPA,Run_Led);//点亮LED1



while(1)

{

uint8_t i;

for(i = 0; i < 10; i++)

{ 

PWM0_Duty_Cycle += 10;//每隔一秒时间加10从而改变占空比

PWMA->CMR0 = ((PWMA->CNR0))*PWM0_Duty_Cycle/100-1;//配置比较寄存器改变占空比

delay_1s();//每隔一秒钟占空比改变一次

}

} 

}