void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)
{
u32 tmppriority = 0x00, tmpreg = 0x00, tmpmask = 0x00;
u32 tmppre = 0, tmpsub = 0x0F;
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NVIC_InitStruct->NVIC_IRQChannelCmd));
assert(IS_NVIC_IRQ_CHANNEL(NVIC_InitStruct->NVIC_IRQChannel));
assert(IS_NVIC_PREEMPTION_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority));
assert(IS_NVIC_SUB_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelSubPriority));
if (NVIC_InitStruct->NVIC_IRQChannelCmd != DISABLE)
{
/* Compute the Corresponding IRQ Priority --------------------------------*/
tmppriority = (0x700 - (SCB->AIRC & (u32)0x700))>> 0x08;//算出来得到的就是占先优先级的位数占四位中的几位
tmppre = (0x4 - tmppriority);
//当SCB->AIRC=0时，tmpppre不就成负数了吗？？？我在实际应用中也确实检测到SCB->AIRC =0，，是库函数错了吗，还是我用错了？？？
tmpsub = tmpsub >> tmppriority; |
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