debug output configurable

hardware/raspberrypi/fan/files/fan_ctrl.py

@@ -14,6 +14,7 @@ FAN_MIN = getenv("RPI_FAN_MIN", 60)  # [%] Fan minimum speed.
 PWM_FREQ = getenv("RPI_FAN_PWMFREQ", 50000)  # [Hz] Change this value if fan has strange behavior
 # Fan speed will change only of the difference of temperature is higher than hysteresis
 hyst = getenv("RPI_FAN_HYST", 5)
+debug = bool(getenv("RPI_FAN_DEBUG", "False"))
 
 # Configurable temperature and fan speed steps
 tempSteps = [50, 55, 57, 60, 68, 70]  # [°C]
@@ -33,7 +34,8 @@ fanSpeed = 0
 cpuTempOld = 0
 fanSpeedOld = 0
 
-print("%s Temp: %s, Fan: %s" % (date.today(), cpuTemp, fanSpeed))
+if debug:
+    print("%s Temp: %s, Fan: %s" % (date.today(), cpuTemp, fanSpeed))
 
 # We must set a speed value for each temperature step
 if len(speedSteps) != len(tempSteps):
@@ -46,7 +48,8 @@ try:
         cpuTempFile = open("/sys/class/thermal/thermal_zone0/temp", "r")
         cpuTemp = float(cpuTempFile.read()) / 1000
         cpuTempFile.close()
-        print("%s Temp: %s, Fan: %s" % (date.today(), cpuTemp, fanSpeed))
+        if debug:
+            print("%s Temp: %s, Fan: %s" % (date.today(), cpuTemp, fanSpeed))
         # Calculate desired fan speed
         if abs(cpuTemp - cpuTempOld) > hyst:
             # Below first value, fan will run at min speed.
@@ -69,7 +72,8 @@ try:
                         and (fanSpeed >= FAN_MIN or fanSpeed == 0)):
                     fan.ChangeDutyCycle(fanSpeed)
                     fanSpeedOld = fanSpeed
-                    print("%s Temp: %s, Fan: %s" % (date.today(), cpuTemp, fanSpeed))
+                    if debug:    
+                        print("%s Temp: %s, Fan: %s" % (date.today(), cpuTemp, fanSpeed))
             cpuTempOld = cpuTemp
 
         # Wait until next refresh