linux-kernel - Re: [PWM PATCH 2/5] Emulates PWM hardware using a high-resolution timer and a GPIO pin

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Date:	Thu, 11 Feb 2010 14:35:14 -0600
From:	Bill Gatliff <bgat@...lgatliff.com>
To:	Pavel Machek <pavel@....cz>
CC:	linux-embedded@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PWM PATCH 2/5] Emulates PWM hardware using a high-resolution
 timer and a GPIO pin

Pavel Machek wrote:
>> +static void
>> +gpio_pwm_work (struct work_struct *work)
>> +{
>> +	struct gpio_pwm *gp = container_of(work, struct gpio_pwm, work);
>> +
>> +	if (gp->active)
>> +		gpio_direction_output(gp->gpio, gp->polarity ? 1 : 0);
>> +	else
>> +		gpio_direction_output(gp->gpio, gp->polarity ? 0 : 1);
>> +}
>>     
>
> ...polarity ^ active ?
>   

... except that if polarity and/or active are >1, I don't send the
values 1 or 0 to gpio_direction_output.  I don't know if the API is
specifically intended to accept nonzero values that are greater than 1.


b.g.

-- 
Bill Gatliff
Embedded systems training and consulting
http://billgatliff.com
bgat@...lgatliff.com

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