Using NMI timer for dimmers and reducing freq to 500Hz

code/espurna/config/general.h

@@ -521,7 +521,7 @@ PROGMEM const char* const custom_reset_string[] = {
 #endif
 
 #if LIGHT_PROVIDER == LIGHT_PROVIDER_DIMMER
-#define LIGHT_MAX_PWM           5000        // 5000 * 200ns => 1 kHz
+#define LIGHT_MAX_PWM           10000        // 5000 * 200ns => 1 kHz
 #endif
 
 #endif // LIGHT_MAX_PWM

code/espurna/libs/pwm.c

@@ -25,7 +25,7 @@
   #define PWM_MAX_CHANNELS 8
 #endif
 #define PWM_DEBUG 0
-#define PWM_USE_NMI 0
+#define PWM_USE_NMI 1
 
 /* no user servicable parts beyond this point */