/* configure the systick handler priority */ NVIC_SetPriority(SysTick_IRQn,0x00U); } /*! \brief turn on selected led \param[in] lednum: specify the Led to be turned on \arg LED1 \arg LED2 \arg LED3 \param[out] none \retval none */ voidgd_eval_led_on(led_typedef_enum lednu...
配置中断向量及重置 STK_VAL 寄存器 回到SysTick_Config() 函数,接下来调用了 NVIC_SetPriority () 函数并配置了 SysTick中断,如果想修改SysTick的优先级,也可以在外部使用 NVIC 配置 SysTick 中断。配置好SysTick 中断后把 STK_VAL 寄存器重新赋值为 0(在使能 SysTick 时,硬件会把存储在STK_LOAD 寄存器 中的...
void systick_config(void) { /* setup systick timer for 1000Hz interrupts */ if(SysTick_Config(SystemCoreClock / 1000U)){ //将系统滴答定时器设置为1Khz,就是1ms触发一次滴答定时器 /* capture error */ while(1){ } } /* configure the systick handler priority */ NVIC_SetPriority(SysTick_IR...
/* configure the systick handler priority */ NVIC_SetPriority(SysTick_IRQn, 0x00U); } 可以通过GPIO API配置LED。使用之前,GPIO外设模块必须开启时钟: /* enable the LED1 GPIO clock */ rcu_periph_clock_enable(RCU_GPIOA); /* configure LED1 GPIO port */ gpio_mode_set(GPIOA, GPIO_MODE_OUT...
NVIC_SetPriority(SysTick_IRQn, 0x00U);} 修改后的：void systick_config(void){ /* setup sys...
/* 捕获错误，程序跑死 */ while (1){ } } NVIC_SetPriority(SysTick_IRQn, 0x00U); // 配置...
}/* configure the systick handler priority */NVIC_SetPriority(SysTick_IRQn,0x00U); } 修改后的: voidsystick_config(void){/* setup systick timer for 1000000Hz interrupts */if(SysTick_Config(SystemCoreClock /1000000U)) {/* capture error */while(1) { ...
NVIC_SetPriority(SysTick_IRQn, 0); } /** * This is the timer interrupt service routine. * */ void SysTick_Handler(void) { /* enter interrupt */ rt_interrupt_enter(); rt_tick_increase(); /* leave interrupt */ rt_interrupt_leave(); ...
{ } } // 关闭滴答定时器 SysTick->CTRL &= ~ SysTick_CTRL_ENABLE_Msk; /* configure the systick handler priority */ NVIC_SetPriority(SysTick_IRQn, 0x00U); } void delay_us(uint32_t count) { delay = count; // 使能滴答定时器 SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk; while(0U ...
NVIC_SetPriority(SysTick_IRQn, 0xFU); } 微秒及毫秒配置函数如下所示,微秒通过systick定时查询实现,毫秒通过微秒实现。 C void delay_us(uint32_t count) { uint32_t temp; count=count*delay_us_mul; if(count>SysTick->LOAD ){ count=SysTick->LOAD ; ...