<![CDATA[T113S3的pwm默认极性问题]]>

<![CDATA[T113S3的pwm默认极性问题]]>各位大佬们好!
刚刚再看pwm的部分,发现手册写的是默认是0,如下图

但是在驱动中加了打印,为啥默认读出来的是1呢?
代码路径:
pwm-sunxi-group.c-->sunxi_pwm_probe-->pwmchip_add-->core.c-->pwmchip_add_with_polarity-->(chip->ops->get_state)-->sunxi_pwm_get_state
代码如下:

static void sunxi_pwm_get_state(struct pwm_chip *pwm_chip,
             struct pwm_device *pwm_device,
             struct pwm_state *state)
{   
    unsigned int reg_offset;
    u32 val, sel;
    struct sunxi_pwm_chip *pc;
    pc = to_sunxi_pwm_chip(pwm_chip);
    sel = pwm_device->pwm - pwm_chip->base;
    reg_offset = pc->data->pcr_base_offset + sel * PWM_REG_UNIFORM_OFFSET;
    val = sunxi_pwm_readl(pwm_chip, reg_offset);
    if (val & BIT_MASK(8))
        state->polarity = PWM_POLARITY_NORMAL; 
    else
        state->polarity = PWM_POLARITY_INVERSED;
    pr_err("polarity = %d\n", state->polarity);
}

默认打印出来是1,是手册写错了吗?

]]>https://bbs.aw-ol.com/topic/7042/t113s3的pwm默认极性问题RSS for NodeTue, 23 Jun 2026 18:41:07 GMTWed, 17 Jun 2026 08:39:12 GMT60