<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/3170#discussion_r31917609">cpu/sam3x8e/periph/pwm.c</a>:</p>
<pre style='color:#555'>> +#include "periph/pwm.h"     /* "driver", interface of pwm.c ONLY */
> +
> +/*
> + * guard file in case no PWM device is defined, all #define'd in "periph_conf.h"
> + */
> +#if PWM_NUMOF && (PWM_0_EN || PWM_1_EN || PWM_2_EN || PWM_3_EN)
> +
> +#define ERR_INIT_MODE           (-1)
> +#define ERR_INIT_BWTH           (-2)
> +#define ERR_SET_CHAN            (-1)
> +
> +// Disable IO on PC2 and set Peripheral device B (PWM0L)
> +#define PWM_0_PIN_SET                           \
> +    PIOC->PIO_PDR |= PIO_PDR_P2;                \
> +    PIOC->PIO_ABSR |= PWM_0_PIN;
> +
</pre>
<p>It's related to <a href="https://github.com/RIOT-OS/RIOT/pull/3170#discussion-diff-31889254" class="issue-link" title="[WIP] cpu/sam3x8e: Add pwm implementation">#3170 (diff)</a>. Will be removed.</p>

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