Initial PWM implementation from gpascualg

extras/pwm/pwm.h

@@ -0,0 +1,18 @@
+/* Implementation of PWM support for the Espressif SDK.
+ *
+ * Part of esp-open-rtos
+ * Copyright (C) 2015 Guillem Pascual Ginovart (https://github.com/gpascualg)
+ * Copyright (C) 2015 Javier Cardona (https://github.com/jcard0na)
+ * BSD Licensed as described in the file LICENSE
+ */
+#include <stdint.h>
+
+#define MAX_PWM_PINS    8
+
+void pwm_init(uint8_t npins, uint8_t* pins);
+void pwm_set_freq(uint16_t freq);
+void pwm_set_duty(uint16_t duty);
+
+void pwm_restart();
+void pwm_start();
+void pwm_stop();