[分享内容]: PWM输出

### PWM个数
AW31最多可以输出6路独立频率、独立占空比的PWM
timer0、timer1、timer2、timer3
mcpwm0、mcpwm1

### 使用例子
```
static u8 pwm_idle = 1; //置 1 可进睡眠, 置 0 不可进睡眠
void pwm_idle_set(u8 is_idle)
{
    pwm_idle = is_idle;
    sleep_run_check_enalbe(is_idle); // 区别于632, 需多加此调用
}
static u8 pwm_idle_query(void)
{
    return pwm_idle;
}
REGISTER_LP_TARGET(pwm_lp_target) = {
    .name = "pwm_lp",
    .is_idle = pwm_idle_query,
};

int timer_pwm_set(u32 id, u32 freq, u32 duty)
{
    log_info("%s[set:%d -> freq:%d duty:%d]", __func__, id, freq, duty);
    gptimer_set_pwm_freq(id, freq);
    gptimer_set_pwm_duty(id, duty);
//    log_info("%s[get:%d -> freq:%d duty:%d]", __func__, id,
//             gptimer_get_pwm_freq(id), gptimer_get_pwm_duty(id));
    return 0;
}
int timer_pwm_init(timer_dev id, u16 pin, u32 freq, u32 duty)
{
    log_info("%s[id:%d pin:0x%x freq:%d duty:%d]", __func__, id, pin, freq, duty);
    pwm_idle_set(0);
    gpio_set_mode(IO_PORT_SPILT(pin), PORT_OUTPUT_LOW); //IO口设为输出
    const struct gptimer_config pwm_config = {
        .pwm.freq = freq,         //设置输出频率
        .pwm.duty = duty,         //设置占空比
        .pwm.port = pin / 16,     //设置pwm输出IO
        .pwm.pin = BIT(pin % 16), //设置pwm输出IO
        .mode = GPTIMER_MODE_PWM, //设置工作模式
    };
    u32 tid = gptimer_init(id, &pwm_config);
    log_info("%s[gptimer_init:%d]", __func__, tid);
    /* gptimer_pwm_flip(tid);  //pwm翻转反向 */
    gptimer_start(tid);
    gptimer_dump();
    return tid;
}
int timer_pwm_run(u32 id, u8 en)
{
    log_info("%s[en:%d]", __func__, en);
    if(en){
        pwm_idle_set(0);
        gptimer_resume(id);
    }else{
        pwm_idle_set(1);
        gptimer_pause(id);
        /* gpio_set_mode(IO_PORT_SPILT(pin), PORT_OUTPUT_LOW); //IO口设为输出0 */
    }
    return 0;
}

int mcpwm_pwm_set(u32 id, u32 freq, u32 duty)
{
    log_info("%s[set:%d -> freq:%d duty:%d]", __func__, id, freq, duty);
    if((freq == 0)&&(duty == 0)){
        freq = 1; // freq == 0, duty == 0 会输出高
    }
    mcpwm_set_frequency(id, MCPWM_EDGE_ALIGNED, freq);
    mcpwm_set_duty(id, duty);
    return 0;
}
int mcpwm_pwm_init(mcpwm_ch_type id, u16 pin, u32 freq, u32 duty)
{
    log_info("%s[id:%d pin:0x%x freq:%d duty:%d]", __func__, id, pin, freq, duty);
    struct mcpwm_config cfg;
    cfg.ch = id;                            //通道号
    cfg.aligned_mode = MCPWM_EDGE_ALIGNED;  //边沿对齐
    cfg.frequency = freq;                   //频率
    cfg.duty = duty;                        //占空比
    cfg.h_pin = pin;                        //任意引脚
    cfg.l_pin = -1;                         //任意引脚,不需要就填-1
    cfg.complementary_en = 0;               //两个引脚的波形, 0: 同步,  1: 互补，互补波形的占空比体现在H引脚上
    cfg.detect_port = -1;                   //任意引脚,不需要就填-1
    cfg.edge = MCPWM_EDGE_FAILL;
    cfg.irq_cb = NULL;
    cfg.irq_priority = 1;                   //优先级默认为1
    cfg.deadtime_ns = 1000;                 //死驱时间,1000ns
    int mid = mcpwm_init(&cfg);
    log_info("%s[mcpwm id:%d]", __func__, mid);
    mcpwm_start(mid);
    return mid;
}
int mcpwm_pwm_run(u32 id, u8 en)
{
    log_info("%s[en:%d]", __func__, en);
    if(en){
        pwm_idle_set(0);
        mcpwm_start(id);
    }else{
        pwm_idle_set(1);
        mcpwm_pause(id);
        /* gpio_set_mode(IO_PORT_SPILT(IO_PORTA_04), PORT_OUTPUT_LOW);//IO口设为输出0 */
    }
    return 0;
}
```
### demo
【金山文档 | WPS云文档】 AW31N_sdk_release_v1.1.0--6路pwm-usb
https://kdocs.cn/l/cafBqpI4EdVf

### 相关问题
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