本帖最后由 PRW54759 于 2025-8-8 17:21 编辑
void timer_config(void)
{
//使能结构体
timer_oc_parameter_struct timer_ocintpara;
timer_parameter_struct timer_initpara;
timer_break_parameter_struct timer_breakpara;
//使能TIMER时钟
rcu_periph_clock_enable(RCU_TIMER0);
rcu_periph_clock_enable(RCU_TIMER2);
timer_deinit(TIMER0);
//分频
timer_initpara.prescaler = 0;
timer_initpara.alignedmode = TIMER_COUNTER_CENTER_UP;
timer_initpara.counterdirection = TIMER_COUNTER_UP;
timer_initpara.period = 999;
timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
timer_initpara.repetitioncounter = 0;
timer_init(TIMER0,&timer_initpara);
//互补输出
timer_channel_output_struct_para_init(&timer_ocintpara);
timer_ocintpara.outputstate = TIMER_CCX_ENABLE;
timer_ocintpara.outputnstate = TIMER_CCXN_ENABLE;
timer_ocintpara.ocpolarity = TIMER_OC_POLARITY_HIGH;
timer_ocintpara.ocnpolarity = TIMER_OCN_POLARITY_HIGH;
timer_ocintpara.ocidlestate = TIMER_OC_IDLE_STATE_LOW;
timer_ocintpara.ocnidlestate = TIMER_OCN_IDLE_STATE_LOW;
timer_channel_output_config(TIMER0,TIMER_CH_0,&timer_ocintpara);
timer_channel_output_config(TIMER0,TIMER_CH_1,&timer_ocintpara);
//通道0输出
timer_channel_output_pulse_value_config(TIMER0,TIMER_CH_0,950);
timer_channel_output_mode_config(TIMER0,TIMER_CH_0,TIMER_OC_MODE_PWM0); //> 1
timer_channel_output_shadow_config(TIMER0,TIMER_CH_0,TIMER_OC_SHADOW_ENABLE);
//通道1输出
timer_channel_output_pulse_value_config(TIMER0,TIMER_CH_1,500);
timer_channel_output_mode_config(TIMER0,TIMER_CH_1,TIMER_OC_MODE_PWM1); //< 1
timer_channel_output_shadow_config(TIMER0,TIMER_CH_1,TIMER_OC_SHADOW_ENABLE);
//刹车和死区
timer_breakpara.runoffstate = TIMER_ROS_STATE_DISABLE;
timer_breakpara.ideloffstate = TIMER_IOS_STATE_DISABLE ;
timer_breakpara.deadtime = 10;
timer_breakpara.breakpolarity = TIMER_BREAK_POLARITY_LOW;
timer_breakpara.outputautostate = TIMER_OUTAUTO_ENABLE;
timer_breakpara.protectmode = TIMER_CCHP_PROT_0;
timer_breakpara.breakstate = TIMER_BREAK_DISABLE;
timer_break_config(TIMER0,&timer_breakpara);
timer_auto_reload_shadow_enable(TIMER0);
timer_primary_output_config(TIMER0,ENABLE);
timer_master_slave_mode_config(TIMER0, TIMER_MASTER_SLAVE_MODE_ENABLE);
timer_master_output_trigger_source_select(TIMER0, TIMER_TRI_OUT_SRC_UPDATE);
timer_deinit(TIMER2);
timer_initpara.prescaler = 0;
timer_initpara.alignedmode = TIMER_COUNTER_EDGE;
timer_initpara.counterdirection = TIMER_COUNTER_UP;
timer_initpara.period = 1; // 计一个数就更新
timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
timer_initpara.repetitioncounter = 0;
timer_init(TIMER2, &timer_initpara);
timer_ocintpara.outputstate = TIMER_CCX_ENABLE;
timer_ocintpara.outputnstate = TIMER_CCXN_DISABLE;
timer_ocintpara.ocpolarity = TIMER_OC_POLARITY_HIGH;
timer_ocintpara.ocnpolarity = TIMER_OCN_POLARITY_HIGH;
timer_ocintpara.ocidlestate = TIMER_OC_IDLE_STATE_LOW;
timer_ocintpara.ocnidlestate = TIMER_OCN_IDLE_STATE_LOW;
timer_channel_output_config(TIMER2, TIMER_CH_0, &timer_ocintpara);
timer_channel_output_pulse_value_config(TIMER2, TIMER_CH_0, 1);
timer_channel_output_mode_config(TIMER2, TIMER_CH_0, TIMER_OC_MODE_PWM0);
timer_channel_output_shadow_config(TIMER2, TIMER_CH_0, TIMER_OC_SHADOW_DISABLE);
// 被 TIMER0_TRGO 触发 (ITI0 = TIMER0's TRGO)
timer_auto_reload_shadow_enable(TIMER2);
timer_slave_mode_select(TIMER2, TIMER_SLAVE_MODE_EXTERNAL0);
timer_input_trigger_source_select(TIMER2, TIMER_SMCFG_TRGSEL_ITI0);
timer_master_slave_mode_config(TIMER2, TIMER_MASTER_SLAVE_MODE_ENABLE);
timer_master_output_trigger_source_select(TIMER2, TIMER_TRI_OUT_SRC_UPDATE);
timer_interrupt_enable(TIMER0, TIMER_INT_UP);
nvic_irq_enable(TIMER0_UP_IRQn, 0, 0);
timer_enable(TIMER0);
timer_enable(TIMER2);
timer_break_enable(TIMER0);
}
void TIMER0_UP_IRQHandler(void)
{
if(timer_interrupt_flag_get(TIMER0, TIMER_INT_FLAG_UP) == SET)
{
timer_interrupt_flag_clear(TIMER0, TIMER_INT_FLAG_UP);
gpio_togglepin(GPIOA, GPIO_PIN_1);
}
}
部分代码如上，我想实现在高级定时器TIMER0的ARR处和ZERO处进入中断然后进行ADC采样和环路控制，但是实际测试的时候LED翻转时机相对于TIMER0的ARR处和ZERO处明显延后(大约500ns)，这是什么情况，而且当翻转的代码放到清除标志位之外的地方时，ARR和ZERO处各有两次翻转。下图是测试图，黄色为LED灯信号，红色为PWM输出信号。
|
-
|
楼主
