- 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.
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