STM32F103RCT6 256k flash 需要选择STM32F10X High-desity Flash
这样在使用定时器5的时候
//中断优先级NVIC设置
NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn; //TIM5中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //优占优先级0级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //从优先级3级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure); //初始化NVIC寄存器
TIM_Cmd(TIMER, ENABLE); //使能TIMx
TIM5_IRQn 就不会报错