以下代码出自CH32V103的库函数，此函数为实现5个不同分支的if elseif else 结构的判断工作，由于判断对象都是常量，因此我认为可以使用switch case 优化这些操作，以便看着更加简洁清爽。
于是我让chatGPT帮我完成这个事情。
我的提问截图
原始内容
void NVIC_Init(NVIC_InitTypeDef *NVIC_InitStruct)
{
uint8_t tmppre = 0;
if(NVIC_Priority_Group == NVIC_PriorityGroup_0)
{
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel, NVIC_InitStruct->NVIC_IRQChannelSubPriority << 4);
}
else if(NVIC_Priority_Group == NVIC_PriorityGroup_1)
{
if(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority == 1)
{
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel, (1 << 7) | (NVIC_InitStruct->NVIC_IRQChannelSubPriority << 4));
}
else
{
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel, (0 << 7) | (NVIC_InitStruct->NVIC_IRQChannelSubPriority << 4));
}
}
else if(NVIC_Priority_Group == NVIC_PriorityGroup_2)
{
if(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority <= 1)
{
tmppre = NVIC_InitStruct->NVIC_IRQChannelSubPriority + (4 * NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority);
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel, (0 << 7) | (tmppre << 4));
}
else
{
tmppre = NVIC_InitStruct->NVIC_IRQChannelSubPriority + (4 * (NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority - 2));
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel, (1 << 7) | (tmppre << 4));
}
}
else if(NVIC_Priority_Group == NVIC_PriorityGroup_3)
{
if(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority <= 3)
{
tmppre = NVIC_InitStruct->NVIC_IRQChannelSubPriority + (2 * NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority);
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel, (0 << 7) | (tmppre << 4));
}
else
{
tmppre = NVIC_InitStruct->NVIC_IRQChannelSubPriority + (2 * (NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority - 4));
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel, (1 << 7) | (tmppre << 4));
}
}
else if(NVIC_Priority_Group == NVIC_PriorityGroup_4)
{
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel, NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority << 4);
}
if(NVIC_InitStruct->NVIC_IRQChannelCmd != DISABLE)
{
NVIC_EnableIRQ(NVIC_InitStruct->NVIC_IRQChannel);
}
else
{
NVIC_DisableIRQ(NVIC_InitStruct->NVIC_IRQChannel);
}
}
chatGPT优化后的
void NVIC_Init(NVIC_InitTypeDef *NVIC_InitStruct)
{
uint8_t tmppre = 0;
switch(NVIC_Priority_Group)
{
case NVIC_PriorityGroup_0:
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel,
NVIC_InitStruct->NVIC_IRQChannelSubPriority << 4);
break;
case NVIC_PriorityGroup_1:
if(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority == 1)
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel,
(1 << 7) |
(NVIC_InitStruct->NVIC_IRQChannelSubPriority << 4));
else
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel,
(0 << 7) |
(NVIC_InitStruct->NVIC_IRQChannelSubPriority << 4));
break;
case NVIC_PriorityGroup_2:
if(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority <= 1)
{
tmppre = NVIC_InitStruct->NVIC_IRQChannelSubPriority +
(4 * NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority);
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel,
(0 << 7) | (tmppre << 4));
}
else
{
tmppre = NVIC_InitStruct->NVIC_IRQChannelSubPriority +
(4 * (NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority - 2));
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel,
(1 << 7) | (tmppre << 4));
}
break;
case NVIC_PriorityGroup_3:
if(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority <= 3)
{
tmppre = NVIC_InitStruct->NVIC_IRQChannelSubPriority +
(2 * NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority);
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel,
(0 << 7) | (tmppre << 4));
}
else
{
tmppre = NVIC_InitStruct->NVIC_IRQChannelSubPriority +
(2 * (NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority - 4));
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel,
(1 << 7) | (tmppre << 4));
}
break;
case NVIC_PriorityGroup_4:
NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel,
NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority << 4);
break;
}
if(NVIC_InitStruct->NVIC_IRQChannelCmd != DISABLE)
NVIC_EnableIRQ(NVIC_InitStruct->NVIC_IRQChannel);
else
NVIC_DisableIRQ(NVIC_InitStruct->NVIC_IRQChannel);
}
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