使用Timer4的CH1输出占空比50%,频率800KHz的PWM波形
4 void TimerConfig(void) 5 { 6 timer_deinit(TIMER4); 7 rcu_periph_clock_enable(RCU_GPIOA); 8 rcu_periph_clock_enable(RCU_GPIOC); 9 rcu_periph_clock_enable(RCU_TIMER4); 10 11 timer_internal_clock_config(TIMER4); //选择内部时钟CK_TIMER(200M) 12 16 17 gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_1); 18 gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_1); 19 gpio_af_set(GPIOA, GPIO_AF_2, GPIO_PIN_1); 20 21 /* TIMER1配置为0.1ms定时 */ 22 timer_parameter_struct timer_initpara; 23 24 timer_initpara.prescaler = 4; 25 timer_initpara.clockdivision = TIMER_CKDIV_DIV1;//根据prescaler,clockdivision最终该定时器时钟评率为1M 26 timer_initpara.alignedmode = TIMER_COUNTER_EDGE;//触发方式设置根据边沿决定 27 timer_initpara.counterdirection = TIMER_COUNTER_UP;//设置为上升沿触发 28 timer_initpara.period = 49;//设置为0.1ms触发一次 29 timer_initpara.repetitioncounter = 0; 30 timer_init(TIMER4, &timer_initpara); 31 32 /* TIMER的CH1配置为PWM输出:边触发,这样保证每0.1ms产生一次触发 */ 33 timer_oc_parameter_struct timer_ocintpara; 34 35 timer_ocintpara.ocpolarity = TIMER_OC_POLARITY_HIGH; 36 timer_ocintpara.outputstate = TIMER_CCX_ENABLE; 37 timer_ocintpara.ocnpolarity = TIMER_OCN_POLARITY_HIGH; 38 timer_ocintpara.outputnstate = TIMER_CCXN_DISABLE; 39 timer_ocintpara.ocidlestate = TIMER_OC_IDLE_STATE_LOW; 40 timer_ocintpara.ocnidlestate = TIMER_OCN_IDLE_STATE_LOW; 41 timer_channel_output_config(TIMER4,TIMER_CH_1,&timer_ocintpara); 42 43 timer_channel_output_pulse_value_config(TIMER4, TIMER_CH_1, 25); 44 timer_channel_output_mode_config(TIMER4, TIMER_CH_1, TIMER_OC_MODE_PWM0); 45 timer_channel_output_shadow_config(TIMER4, TIMER_CH_1, TIMER_OC_SHADOW_DISABLE); 46 47 /* 使能TIMERx_CAR寄存器的影子寄存器 */ 48 timer_auto_reload_shadow_enable(TIMER4); 49 /* 所有通道输出使能 */ 50 timer_primary_output_config(TIMER4, ENABLE); 51 52 timer_enable(TIMER4); 53 54 timer_interrupt_enable(TIMER4,TIMER_INT_UP); 55 56 return; 57 }
测量PA1,即可看到800KHz的PWM波形