stm8l15x TIM3 PWM配置

CLK_PeripheralClockConfig(CLK_Peripheral_TIM3, ENABLE);

/*

set SB_TX_LOCK mode:

PWM mode,T = 60us, 

Duty Ratio: 3/4  represents  send bit 1

1/2  represents  send bit 0

1/4  represents  a  respond

        TIM3_Prescaler_16,and T = 60;

*/

GPIO_Init(SB_TX_LOCK_PORT,SB_TX_LOCK_PIN,GPIO_Mode_Out_PP_High_Fast);

TIM3_DeInit();

#if (SYS_CLOCK_16M)

TIM3_TimeBaseInit(TIM3_Prescaler_16, TIM3_CounterMode_Up,PWM_T); 

#endif

#if (SYS_CLOCK_8M)

TIM3_TimeBaseInit(TIM3_Prescaler_8, TIM3_CounterMode_Up,PWM_T); 

#endif

#if (SYS_CLOCK_4M)

TIM3_TimeBaseInit(TIM3_Prescaler_4, TIM3_CounterMode_Up,PWM_T); 

#endif

  /* PWM1 Mode configuration: Channel1 default Duty Ratio is 1/2 */ 

  TIM3_OC1Init(TIM3_OCMode_PWM1, TIM3_OutputState_Enable,PWM_T/2,TIM3_OCPolarity_High,TIM3_OCIdleState_Set);

  TIM3_OC1PreloadConfig(ENABLE);

TIM3_ARRPreloadConfig(ENABLE);

TIM3_ITConfig(TIM3_IT_Update,ENABLE);

/*enable PWM output*/

TIM3_CtrlPWMOutputs(ENABLE);   

  /* TIM3 enable counter */

TIM3_Cmd(ENABLE);

该代码已经测试通过。占空比是50%，周期是PWM_T.