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测试硬件：GD32A503CC测试外设：TIMER0_CH1 测试准备：PE5输入高频PWM 中断优先级配置：UP中断高于CH1中断 void nvic_configuration(void) { nvic_priority_group_set(NVIC_PRIGROUP_PRE1_SUB3); nvic_irq_enable(TIMER0_BRK_UP_TRG_CMT_IRQn, 1, 0); nvic_irq_enable(TIMER0_Channel_IRQn, 1, 1); } 测试定时器配置：配置TIMER0_CH1为双沿输入捕获模式，使能TIMER0 UP上溢与CH1中断。 void timer_configuration(void) { /* TIMER1 configuration: input capture mode ------------------- the external signal is connected to TIMER0 CH1 pin (PE5) the rising edge is used as active edge the TIMER1 CH0CV is used to compute the frequency value ------------------------------------------------------------ */ timer_ic_parameter_struct timer_icinitpara; timer_parameter_struct timer_initpara; rcu_periph_clock_enable(RCU_TIMER0); timer_deinit(TIMER0); /* TIMER0 configuration */ timer_struct_para_init(&timer_initpara); timer_initpara.prescaler = 99; timer_initpara.alignedmode = TIMER_COUNTER_EDGE; timer_initpara.counterdirection = TIMER_COUNTER_UP; timer_initpara.period = 65535; timer_initpara.clockdivision = TIMER_CKDIV_DIV1; timer_initpara.repetitioncounter = 0; timer_init(TIMER0, &timer_initpara); /* TIMER0 configuration */ /* TIMER0 CH1 input capture configuration */ timer_channel_input_struct_para_init(&timer_icinitpara); timer_icinitpara.icpolarity = TIMER_IC_POLARITY_BOTH_EDGE; timer_icinitpara.icselection = TIMER_IC_SELECTION_DIRECTTI; timer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1; timer_icinitpara.icfilter = 0x0; timer_input_capture_config(TIMER0, TIMER_CH_1, &timer_icinitpara); /* auto-reload preload enable */ timer_auto_reload_shadow_enable(TIMER0); /* clear channel 0 interrupt bit */ timer_interrupt_flag_clear(TIMER0, TIMER_INT_FLAG_UP); /* channel 0 interrupt enable */ timer_interrupt_enable(TIMER0, TIMER_INT_UP); /* clear channel 0 interrupt bit */ timer_interrupt_flag_clear(TIMER0, TIMER_INT_FLAG_CH1); /* channel 0 interrupt enable */ timer_interrupt_enable(TIMER0, TIMER_INT_CH1); /* TIMER0 counter enable */ timer_enable(TIMER0); } 中断处理： __IO uint16_t u16_cap_tick = 0; __IO uint32_t u32_cap_tick = 0; __IO uint32_t u32_cap_tick_pre = 0; __IO uint16_t ovf_cont = 0; __IO uint32_t err_cnt = 0; void TIMER0_BRK_UP_TRG_CMT_IRQHandler(void) { if(SET == timer_interrupt_flag_get(TIMER0, TIMER_INT_FLAG_UP)) { /* clear channel1 interrupt bit */ timer_interrupt_flag_clear(TIMER0, TIMER_INT_FLAG_UP); /* count overflow value */ ovf_cont++; } } void TIMER0_Channel_IRQHandler(void) { if(SET == timer_interrupt_flag_get(TIMER0, TIMER_INT_FLAG_CH1)) { /* clear channel1 interrupt bit */ timer_interrupt_flag_clear(TIMER0, TIMER_INT_FLAG_CH1); /* read channel 1 capture value */ u16_cap_tick = timer_channel_capture_value_register_read(TIMER0, TIMER_CH_1); u32_cap_tick_pre = u32_cap_tick; u32_cap_tick = u16_cap_tick + (ovf_cont << 16); if(u32_cap_tick_pre > u32_cap_tick) { err_cnt++; } } } 出现问题：TIMER0 CNT接近上溢时发生CH1捕获中断， 捕获中断有一定几率先于UP中断处理，导致err_cnt计数错误。 示例中，err_cnt会有计数。

[color=#2e3033][backcolor=rgb(255, 255, 255)][font=-apple-system, BlinkMacSystemFont, "]我正在使用MM32F5277设计一个bootloader和app,但是app无法在我指定的rom地址运行，[/font][/backcolor][/color][color=#2e3033][backcolor=rgb(255, 255, 255)][font=-apple-system, BlinkMacSystemFont, "]修改MDK中option->Target中的IROM地址和大小无法生效，[/font][/backcolor][/color] [color=#2e3033][backcolor=rgb(255, 255, 255)][font=-apple-system, BlinkMacSystemFont, "]app还是运行在默认的0x08000000，[/font][/backcolor][/color] [color=#2e3033][backcolor=rgb(255, 255, 255)][font=-apple-system, BlinkMacSystemFont, "]修改mm32f5277e_flash.scf文件中：[/font][/backcolor][/color] [color=#2e3033][backcolor=rgb(255, 255, 255)][font=-apple-system, BlinkMacSystemFont, "]__ROM_BASE为 0x08008000;[/font][/backcolor][/color] [color=#2e3033][backcolor=rgb(255, 255, 255)][font=-apple-system, BlinkMacSystemFont, "]__ROM_SIZE为 0x00038000;[/font][/backcolor][/color] [color=#2e3033][backcolor=rgb(255, 255, 255)][font=-apple-system, BlinkMacSystemFont, "]app无法正常运行，通过MDK的debug模式可以看到上电后无法访问内存[/font][/backcolor][/color] [font=-apple-system, BlinkMacSystemFont, PingFang SC, Microsoft YaHei, sans-serif][color=#2e3033]Cannot access Memory ([url=home.php?mod=space&uid=72445]@[/url] 0xfffffffe, Read, Acc Size: 2 Byte)[/color][/font]