(Kinetis K60) FTM输出PWM

程序 LED渐亮渐灭

#include "project.h"


void delay(U32);
void FTM_PWM_Init(void);
;

void main(void)
{

    U16 FTM2_CH0_Duty,FTM2_CH1_Duty
    DisableInterrupts;

    UART4_Init(115200);
    FTM_PWM_Init();

    EnableInterrupts;

    while(1)
    {
        for(FTM2_CH0_Duty = 0,FTM2_CH1_Duty = 0;FTM2_CH1_Duty  < 300;FTM2_CH1_Duty++,FTM2_CH0_Duty++)
        {
            FTM2_C0V = FTM2_CH0_Duty;
            FTM2_C1V = FTM2_CH1_Duty;
            delay(100000);
        }
        for(FTM2_CH0_Duty = 300,FTM2_CH1_Duty = 300;FTM2_CH1_Duty  > 0;FTM2_CH1_Duty--,FTM2_CH0_Duty--)
        {
            FTM2_C0V = FTM2_CH0_Duty;
            FTM2_C1V = FTM2_CH1_Duty;  
            delay(100000);
        }

    }

}

void delay(U32 count)
{
    while(count--);
}

void FTM_PWM_Init(void)
{
 
    PORTA_PCR10 = PORT_PCR_MUX(0x03) | PORT_PCR_DSE_MASK;
    PORTA_PCR11 = PORT_PCR_MUX(0x03) | PORT_PCR_DSE_MASK;
   
    SIM_SCGC3 |= SIM_SCGC3_FTM2_MASK;
 
    FTM2_SC |= (FTM_SC_CLKS(1)           // 系统时钟
               |FTM_SC_PS(7));           // 128 分频
   
    FTM2_C0SC |= (FTM_CnSC_MSB_MASK      // MSB 1
                 |FTM_CnSC_ELSA_MASK);   // ELSA 1

    FTM2_C1SC |= (FTM_CnSC_MSB_MASK      // MSB 1
                 |FTM_CnSC_ELSA_MASK);   // ELSA 1   
   
    FTM2_OUTMASK = 0XFC;                 // 屏蔽CH2~CH7通道 打开CH0 CH1
    FTM2_CNTIN = 0;                      //FTM 计数初始值 
    FTM2_MOD   = 299;                    // 计数的值 频率=分频/(MOD - CNTIN + 1)
   
    FTM2_C0V   = 0;                      // 占空比 (CnV-CNTIN)/(MOD-CNTIN+1)
    FTM2_C1V   = 0;                      // 占空比
}