pwm: missing header

missed when moving new-pwm includes
fix accidentally including sdk header

Author: mcspr

code/espurna/pwm.h

@@ -0,0 +1,44 @@
+/*
+
+PWM MODULE
+
+Copyright (C) 2019-2022 by Maxim Prokhorov <prokhorov dot max at outlook dot com>
+
+*/
+
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+
+// Associate list of PINs with CHANNELs
+bool pwmInitPins(const uint8_t* begin, const uint8_t* end);
+
+template <typename T>
+bool pwmInitPins(const T& pins) {
+    return pwmInitPins(pins.data(), pins.data() + pins.size());
+}
+
+// PWM driver accepts certain value range
+struct PwmRange {
+    uint32_t min;
+    uint32_t max;
+};
+
+// u32 values accepted by pwmDuty()
+PwmRange pwmRange();
+
+// Number of configured PWM channels
+size_t pwmChannels();
+
+// Update specific channel with raw value (see pwmRange())
+void pwmDuty(size_t channel, uint32_t duty);
+
+// Or, using a percentage value
+void pwmDuty(size_t channel, float duty);
+
+// Apply all channel duty values
+void pwmUpdate();
+
+// Configure driver. Should be called *before* initializing any pins.
+void pwmSetup();