tm4c123g中断优先级怎么设置

tm4c123g中断优先级怎么设置

设置中断优先级的函数，CMISIS已经写好，并嵌入到了编译器中，例如，我们用KEIL开发的话，设置中断优先级的函数位于core_cm0.h文件当中，函数如下所示：

__STATIC_INLINE void NVIC_SetPriority(IRQn_Type IRQn, uint32_t priority)
{
if(IRQn < 0) {
SCB->SHP[_SHP_IDX(IRQn)] = (SCB->SHP[_SHP_IDX(IRQn)] & ~(0xFF << _BIT_SHIFT(IRQn))) |
(((priority << (8 - __NVIC_PRIO_BITS)) & 0xFF) << _BIT_SHIFT(IRQn)); }
else {
NVIC->IP[_IP_IDX(IRQn)] = (NVIC->IP[_IP_IDX(IRQn)] & ~(0xFF << _BIT_SHIFT(IRQn))) |
(((priority << (8 - __NVIC_PRIO_BITS)) & 0xFF) << _BIT_SHIFT(IRQn)); }
}

从上面函数可以看出，该函数有两个参数，IRQn是指要设置的中断向量，priority是中断优先级，优先级可以是0 1 2 3四个数，0的优先级最大，3的优先级最小。假设你要设置GPIO1中断的优先级最高，那么就是：
NVIC_SetPriority(EINT1_IRQn, 0);
这时，有人会问，”EINT1_IRQn”
答：这个可以在LPC11xx.h文件当中找到，如下所示：

typedef enum IRQn
{

Reset_IRQn = -15,
NonMaskableInt_IRQn = -14,
HardFault_IRQn = -13,
SVCall_IRQn = -5,
PendSV_IRQn = -2,
SysTick_IRQn = -1,


WAKEUP0_IRQn = 0,
WAKEUP1_IRQn = 1,
WAKEUP2_IRQn = 2,
WAKEUP3_IRQn = 3,
WAKEUP4_IRQn = 4,
WAKEUP5_IRQn = 5,
WAKEUP6_IRQn = 6,
WAKEUP7_IRQn = 7,
WAKEUP8_IRQn = 8,
WAKEUP9_IRQn = 9,
WAKEUP10_IRQn = 10,
WAKEUP11_IRQn = 11,
WAKEUP12_IRQn = 12,
CAN_IRQn = 13,
SSP1_IRQn = 14,
I2C_IRQn = 15,
TIMER_16_0_IRQn = 16,
TIMER_16_1_IRQn = 17,
TIMER_32_0_IRQn = 18,
TIMER_32_1_IRQn = 19,
SSP0_IRQn = 20,
UART_IRQn = 21,
Reserved0_IRQn = 22,
Reserved1_IRQn = 23,
ADC_IRQn = 24,
WDT_IRQn = 25,
BOD_IRQn = 26,
FMC_IRQn = 27,
EINT3_IRQn = 28,
EINT2_IRQn = 29,
EINT1_IRQn = 30,
EINT0_IRQn = 31,
} IRQn_Type;

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