我在使用定时器5产生定时中断时发现先设置中断优先级再初始化定时器,定时器不能工作,具体代码如下如果直接在定时器5初始化函数加中断优先级配置则工作正常,请给位大佬帮忙看看。
//中断优先级设置
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = TIM8_UP_IRQn; //TIM3ÖD¶Ï
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =0; //ÏèÕ¼óÅÏ輶2¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //′óóÅÏ輶0¼¶
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μà±»ê1Äü
NVIC_Init(&NVIC_InitStructure); //¸ù¾YNVIC_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =0; //ÏèÕ¼óÅÏ輶 2
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //′óóÅÏ輶 0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //TIM3ÖD¶Ï
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =0; //ÏèÕ¼óÅÏ輶2¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //′óóÅÏ輶0¼¶
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μà±»ê1Äü
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3ÖD¶Ï
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =1; //ÏèÕ¼óÅÏ輶2¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //′óóÅÏ輶0¼¶
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μà±»ê1Äü
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn; //TIM3ÖD¶Ï
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =2; //ÏèÕ¼óÅÏ輶2¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //′óóÅÏ輶0¼¶
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μà±»ê1Äü
NVIC_Init(&NVIC_InitStructure);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn; //TIM3ÖD¶Ï
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =1; //ÏèÕ¼óÅÏ輶2¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //′óóÅÏ輶0¼¶
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μà±»ê1Äü
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //ÏèÕ¼óÅÏ輶
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //′óóÅÏ輶 0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
NVIC_InitStructure.NVIC_IRQChannel = TIM6_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //ÏèÕ¼óÅÏ輶 1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //′óóÅÏ輶 0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //ÏèÕ¼óÅÏ輶 2
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //′óóÅÏ輶 0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// NVIC_SetPriority(SysTick_IRQn,NVIC_EncodePriority(NVIC_GetPriorityGrouping(),0,0));
}
//定时器5初始化
void TIM5_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_SetCounter( TIM5, 0x0000);
TIM_ClearFlag(TIM5, TIM_FLAG_Update);
TIM_ClearITPendingBit(TIM5, TIM_FLAG_Update); //??TIM2???????????
TIM_ARRPreloadConfig(TIM5, ENABLE);
TIM_ITConfig(TIM5, TIM_IT_Update, ENABLE); //??TIM2???
TIM_TimeBaseStructure.TIM_Period = 5000; //????????2000,??????0xffff
TIM_TimeBaseStructure.TIM_Prescaler =7199; //??72
TIM_TimeBaseStructure.TIM_ClockDivision = 0; // ????
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //????????
TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure);
TIM_Cmd(TIM5, ENABLE); //TIM2 enable counter
}
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