#夏日挑战赛#【FFH】BearPi_Micro南向开发PWM驱动代码 原创 精华

MyHandler = PwmOpen(uint32_t num);
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DevHandle PwmOpen(uint32_t num)
{
struct PwmDev *pwm = PwmGetDevByNum(num);   //创建控制器结构体
//判断pwm是否成功启用
(void)OsalSpinLock(&(pwm->lock));   //上锁
//判断pwm->busy是否为繁忙，若为繁忙则解锁退出报错
//判断pwm->method和method->open是否不为空
 pwm->busy = true;
(void)OsalSpinUnlock(&(pwm->lock)); //解锁
return (DevHandle)pwm;
}
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struct PwmDev {
    struct IDeviceIoService service;
    struct HdfDeviceObject *device;
    struct PwmConfig cfg;       // 属性结构体，相关定义见下
    struct PwmMethod *method;   // 钩子函数模板
    bool busy;                  //PWM是否在使用
    uint32_t num;               // 设备号
    OsalSpinlock lock;
    void *priv;                 // 私有数据，一般存储自定义结构体首地址，方便调用
};
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struct PwmConfig {
    uint32_t duty;              // 占空时间 
    uint32_t period;            // pwm 周期 
    uint32_t number;            // pwm 连续个数
    uint8_t polarity;           // 输出的极性 
    uint8_t status;             // 运行状态
};
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struct PwmMethod {
    int32_t (*setConfig)(struct PwmDev *pwm, struct PwmConfig *config);
    int32_t (*open)(struct PwmDev *pwm);
    int32_t (*close)(struct PwmDev *pwm);
};
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PwmSetConfig(DevHandle handle, struct PwmConfig *config);
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PwmClose(DevHandle Handler);
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PwmSetPeriod(DevHandle handle, uint32_t period);
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PwmSetDuty(DevHandle handle, uint32_t duty);
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PwmSetPolarity(DevHandle handle, uint8_t polarity);
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PwmEnable(DevHandle handle);
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PwmDisable(DevHandle handle);
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