# 编程实例
#### 实例描述
本实例实现如下功能：
1. 创建中断。
2. 设置中断亲和性。
3. 使能中断。
4. 触发中断。
5. 屏蔽中断。
6. 删除中断。
 
#### 编程示例
前提条件：menuconfig菜单中配置中断使用最大数、配置可设置的中断优先级个数。
代码实现如下：
```
#include "los_hwi.h"
#include "los_typedef.h"
#include "los_task.h"
STATIC VOID HwiUsrIrq(VOID)
{
    printf("\n in the func HwiUsrIrq \n"); 
}
/* cpu0 trigger, cpu0 response */
UINT32 It_Hwi_001(VOID)
{
    UINT32 ret;
    UINT32 irqNum = 26; /* ppi */
    UINT32 irqPri = 0x3;
    ret = LOS_HwiCreate(irqNum, irqPri, 0, (HWI_PROC_FUNC)HwiUsrIrq, 0);
    if (ret != LOS_OK) {
        return LOS_NOK;
    }
#ifdef LOSCFG_KERNEL_SMP
    ret = LOS_HwiSetAffinity(irqNum, CPUID_TO_AFFI_MASK(ArchCurrCpuid()));
    if (ret != LOS_OK) {
        return LOS_NOK;
    }
#endif
    ret = LOS_HwiEnable(irqNum);
    if (ret != LOS_OK) {
        return LOS_NOK;
    }
    ret = LOS_HwiTrigger(irqNum);
    if (ret != LOS_OK) {
        return LOS_NOK;
    }
    LOS_TaskDelay(1);
    ret = LOS_HwiDisable(irqNum);
    if (ret != LOS_OK) {
        return LOS_NOK;
    }
    ret = LOS_HwiDelete(irqNum, NULL);
    if (ret != LOS_OK) {
        return LOS_NOK;
    }
    return LOS_OK;
}
```
#### 完整实例
[sample_hwi.c](https://support.huaweicloud.com/kernelmanual-LiteOS/resource/sample_hwi.c)