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TM4C123x 程序小练 利用PWM模块产生占空比自动从0.1%到100%循环调节的PWM波

xyz549040622
Guru 65885 points 


/*******************************************
开发坏境:CCSv5
程序功能:利用PWM模块产生占空比自动从0.1%到100%循环调节的PWM波
程序说明:使用PWM模块0，PWM发生器0，输出为PWM0管脚，PB6 利用PWM中断
********************************************/
#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "driverlib/gpio.h"
#include "driverlib/interrupt.h"
#include "driverlib/pin_map.h"
#include "driverlib/pwm.h"
#include "driverlib/sysctl.h"

unsigned int PWM_Value=1852; //PWM占空比调节

void PWM0IntHandler(void)
{
    PWMGenIntClear(PWM0_BASE, PWM_GEN_0, PWM_INT_CNT_LOAD);

    if((PWMPulseWidthGet(PWM0_BASE, PWM_OUT_0) + 64) <=
       (PWMGenPeriodGet(PWM0_BASE, PWM_GEN_0) ))
    {
        PWMPulseWidthSet(PWM0_BASE, PWM_OUT_0,
                         PWMPulseWidthGet(PWM0_BASE, PWM_OUT_0) + 64);
    }
    else
    {
        PWMPulseWidthSet(PWM0_BASE, PWM_OUT_0, 64);
    }
}

int main(void)
{
    SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);
    SysCtlPWMClockSet(SYSCTL_PWMDIV_1);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_PWM0);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
    GPIOPinConfigure(GPIO_PB6_M0PWM0);
    GPIOPinTypePWM(GPIO_PORTB_BASE, GPIO_PIN_6);

    PWMGenConfigure(PWM0_BASE, PWM_GEN_0, PWM_GEN_MODE_DOWN | PWM_GEN_MODE_NO_SYNC);
    PWMGenPeriodSet(PWM0_BASE, PWM_GEN_0, PWM_Value);//250HZ

    PWMPulseWidthSet(PWM0_BASE, PWM_OUT_0, PWM_Value/2);//占空比0.1%

    IntMasterEnable();
    PWMIntEnable(PWM0_BASE, PWM_INT_GEN_0);
    // Enable the PWM0 LOAD interrupt on PWM0.
    PWMGenIntTrigEnable(PWM0_BASE, PWM_GEN_0, PWM_INT_CNT_LOAD);
    IntEnable(INT_PWM0_0);

    PWMOutputState(PWM0_BASE, PWM_OUT_0_BIT, true);
    PWMGenEnable(PWM0_BASE, PWM_GEN_0);
    while(1);
}
  • Guru 65885 points 
    /*******************************************
开发坏境:CCSv5
程序功能:利用PWM模块产生占空比可调的带死区的PWM波
程序说明:使用PWM模块0，PWM发生器0，输出为PWM0和PWM1管脚，分别为PB6，PB7
********************************************/
#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/sysctl.h"
#include "driverlib/rom.h"
#include "driverlib/gpio.h"
#include "driverlib/pwm.h"
#include "driverlib/fpu.h"
#include "driverlib/pin_map.h"

int main (void)
{
	//long int PWM_Value=12500;    //PWM占空比调节
	//使能FPU
	FPUEnable();
	FPULazyStackingEnable();
	//设置系统时钟为16MHz
	SysCtlClockSet(SYSCTL_SYSDIV_1|SYSCTL_USE_OSC|SYSCTL_OSC_MAIN |SYSCTL_XTAL_16MHZ);
	SysCtlPeripheralEnable(SYSCTL_PERIPH_PWM0);//使能PWM0模块
	SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);//使能PWM0和PWM1输出所在GPIO
	GPIOPinTypePWM(GPIO_PORTB_BASE, GPIO_PIN_6);
	GPIOPinTypePWM(GPIO_PORTB_BASE, GPIO_PIN_7);//配置PH0/PH1为PWM功能
	GPIOPinConfigure(GPIO_PB6_M0PWM0);    //#define GPIO_PB6_M0PWM0         0x00011804
	GPIOPinConfigure(GPIO_PB7_M0PWM1);    //#define GPIO_PB7_M0PWM1         0x00011C04
	//驱动电流8MA，推挽输出
	GPIOPadConfigSet(GPIO_PORTB_BASE, GPIO_PIN_6,GPIO_STRENGTH_8MA,GPIO_PIN_TYPE_STD);
	SysCtlPWMClockSet(SYSCTL_PWMDIV_64);     // PWM时钟配置：不分频
	//配置PWM发生器0：加减计数，不同步
	PWMGenConfigure(PWM0_BASE,PWM_GEN_0,PWM_GEN_MODE_UP_DOWN| PWM_GEN_MODE_NO_SYNC);
	//设置PWM发生器1的频率，时钟频率/PWM分频数/n，16M/64/5000=50HZ
	PWMGenPeriodSet(PWM0_BASE, PWM_GEN_0, 5000);
	//设置PWM0/PWM1输出的脉冲宽度
	PWMPulseWidthSet(PWM0_BASE, PWM_OUT_0,2500);//50%占空比
	//PWMPulseWidthSet(PWM0_BASE, PWM_OUT_1, 500);//25%占空比
	PWMDeadBandEnable(PWM0_BASE, PWM_GEN_0, 100, 100);
	//使能PWM0和PWM1的输出
	PWMOutputState(PWM0_BASE, (PWM_OUT_0_BIT |PWM_OUT_1_BIT), true);
	//使能PWM发生器
	PWMGenEnable(PWM0_BASE, PWM_GEN_0);
	while(1)
	{

	}
}