串口DMA模式无法中断，函数NVIC_Init（）是否有问题？

tony_cao · 发表于 2013-4-5 11:33:30

使用两个串口，usart1,usart2,DMA发送，发送完进入DMA发送完成中断，普通中断接收，发现第一次启动DMA发送后，DMA工作发送，但发送完无法进入DMA发送完中断。USART1 DMA1_Channel4, USART2 DMA1_Channel7 ,调试的时候发现第一次运行NVIC_Init（）配置USART1，NVIC的SETENA0组里的SETENA14=1；这应该是正确的，接着配置USART2，第二次运行NVIC_Init（）配置USART2，NVIC的SETENA0组里的SETENA17=1，但SETENA14=0，我想应该是SETENA14=1，SETENA17=1，但现在确是SETENA14=0，SETENA17=1

void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
          NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
#ifdef USING_UART1
/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

        /* Enable the DMA1 Channel4 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel =DMA1_Channel4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
#endif

#ifdef USING_UART2
/* Enable the USART2 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

/* Enable the DMA1 Channel2 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel7_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
#endif

}

tony_cao · 发表于 2013-4-5 11:44:22

tony_cao · 发表于 2013-4-5 11:47:54

tony_cao · 发表于 2013-4-5 11:51:32

void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)
{
uint32_t tmppriority = 0x00, tmppre = 0x00, tmpsub = 0x0F;

/* Check the parameters */
assert_param(IS_FUNCTIONAL_STATE(NVIC_InitStruct->NVIC_IRQChannelCmd));
assert_param(IS_NVIC_PREEMPTION_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority));
assert_param(IS_NVIC_SUB_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelSubPriority));

if (NVIC_InitStruct->NVIC_IRQChannelCmd != DISABLE)
{
    /* Compute the Corresponding IRQ Priority --------------------------------*/
    tmppriority = (0x700 - ((SCB->AIRCR) & (uint32_t)0x700))>> 0x08;
    tmppre = (0x4 - tmppriority);
    tmpsub = tmpsub >> tmppriority;

    tmppriority = (uint32_t)NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority << tmppre;
    tmppriority |= NVIC_InitStruct->NVIC_IRQChannelSubPriority & tmpsub;
    tmppriority = tmppriority << 0x04;

    NVIC->IP[NVIC_InitStruct->NVIC_IRQChannel] = tmppriority;

    /* Enable the Selected IRQ Channels --------------------------------------*/
    /* = false? shall |= */
     NVIC->ISER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
      (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
    }
else
{
    /* Disable the Selected IRQ Channels -------------------------------------*/
   NVIC->ICER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
    (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);

}
}

这条是否有错？
NVIC->ISER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
      (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);

我觉得应该是
NVIC->ISER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] | =
      (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);

但这事库代码，不应该有问题，究竟出在哪里？

正点原子 · 发表于 2013-4-5 13:24:47

回复【4楼】tony_cao:
---------------------------------
不关库函数的事吧。
你把三个外设的中断都设置成同样优先级是不合适的。
你设置为不同优先级试试。

tony_cao · 发表于 2013-4-5 13:44:38

设不同的优先级后，结果一样，还是无法得到SETENA14=1，SETENA17=1，顺序运行的结果是SETENA14=0，SETENA17=1

哪位帮我运行一下上面的void NVIC_Configuration(void)
看结果是否一样

tony_cao · 发表于 2013-4-5 13:46:59

void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
          NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
#ifdef USING_UART1
/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

        /* Enable the DMA1 Channel4 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel =DMA1_Channel4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
#endif

#ifdef USING_UART2
/* Enable the USART2 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

        /* Enable the DMA1 Channel2 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel7_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
#endif

}