fix pwm behavior at 100% (#1227)

Author: timoschilling

src/shelly_output.cpp

@@ -66,12 +66,14 @@ Status OutputPin::SetState(bool on, const char *source) {
 }
 
 Status OutputPin::SetStatePWM(float duty, const char *source) {
-  if (duty != 0) {
-    mgos_pwm_set(pin_, 400, duty);
-    LOG(LL_DEBUG, ("Output %d: %f (%s)", id(), duty, source));
+  LOG(LL_INFO, ("Duty: %.3f", duty));
+  if (duty == 0 || duty == 1) {
+    mgos_gpio_write(pin_, duty);
+    LOG(LL_INFO,
+        ("Output %d: %s (%s)", id(), (duty == 0 ? "OFF" : "ON"), source));
   } else {
-    mgos_pwm_set(pin_, 0, 0);
-    LOG(LL_DEBUG, ("Output %d: OFF (%s)", id(), source));
+    mgos_pwm_set(pin_, 400, duty);
+    LOG(LL_INFO, ("Output %d: %f (%s)", id(), duty, source));
   }
   return Status::OK();
 }