GD32F407 timer延迟函数，非中断

void dri_timer_delay_init(dri_timer_calc_type type)
{
	timer_parameter_struct ptr_time;
	
	rcu_periph_clock_enable(PERIPH_DELAY_TIMER);
	rcu_timer_clock_prescaler_config(RCU_TIMER_PSC_MUL4);
	
	timer_deinit(DELAY_TIMER);
    
    /* Time base configuration */
    ptr_time.clockdivision = TIMER_CKDIV_DIV1;
    ptr_time.counterdirection = TIMER_COUNTER_DOWN;
    ptr_time.period = 1;
	
	if(type == DRI_TIMER_CALC_TYPE_S)	
    {	
		//预分频 168MHz / 1680 = 100kHz(1ms),计数值设置为1000则为1S延时
		ptr_time.period = 1000;
        ptr_time.prescaler = 1680-1; 	
    } 
	else if(type == DRI_TIMER_CALC_TYPE_MS)	
    {	
        ptr_time.prescaler = 1680-1; //100kHz ,定时器计数1次为ms
    }
	else if(type == DRI_TIMER_CALC_TYPE_US)
    {	
        ptr_time.prescaler = 168-1; //1MHz ,计数1次为us  
    }
	else  
    {  
        ptr_time.prescaler = 1680-1;  
    } 
	
    timer_init(DELAY_TIMER, &ptr_time);
	
    
    /* TIM interrupt enable */
//    __TIM_INTR_ENABLE(DELAY_TIMER, TIM_INTR_UPDATE);
    
    /* TIM enable */
    timer_enable(DELAY_TIMER);
}

/************************************************
函数名称 ： TIMDelay_us
功    能 ： 定时器延时 N us
参    数 ： Times --- N值
返 回 值 ： 无
作    者 ：
*************************************************/
void dri_timer_delay_us(uint32_t Times)	
{  	
    uint32_t counter = Times & 0xFFFFFFFF;
 	
	TIMER_CNT(TIMER3) = counter; //设置计数值
    TIMER_CTL0(TIMER3) |= TIMER_CTL0_CEN;  	
    while(TIMER_CNT(TIMER3) > 1);
 	TIMER_CTL0(TIMER3) &= (uint16_t)(~TIMER_CTL0_CEN);
}

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