Format with black, fix pylint errors

[Adafruit_Blinka-hackapet.git] / src / adafruit_blinka / microcontroller / generic_linux / sysfs_pwmout.py

diff --git a/src/adafruit_blinka/microcontroller/generic_linux/sysfs_pwmout.py b/src/adafruit_blinka/microcontroller/generic_linux/sysfs_pwmout.py
index ae4da4b78124eefbd15b5b35723efc984ac5f0bf..f751b71a4a017dc3870da1e1445820b6c521e1ce 100644 (file)
--- a/src/adafruit_blinka/microcontroller/generic_linux/sysfs_pwmout.py
+++ b/src/adafruit_blinka/microcontroller/generic_linux/sysfs_pwmout.py
@@ -26,10 +26,6 @@ class PWMError(IOError):
 
 class PWMOut:
     """Pulse Width Modulation Output Class"""
-    # Number of retries to check for successful PWM export on open
-    PWM_STAT_RETRIES = 10
-    # Delay between check for scucessful PWM export on open (100ms)
-    PWM_STAT_DELAY = 0.1
 
     # Number of retries to check for successful PWM export on open
     PWM_STAT_RETRIES = 10
@@ -136,7 +132,7 @@ class PWMOut:
                 if e.errno != EACCES or (
                     e.errno == EACCES and i == PWMOut.PWM_STAT_RETRIES - 1
                 ):
-                    raise PWMError(e.errno, "Opening PWM period: " + e.strerror)
+                    raise PWMError(e.errno, "Opening PWM period: " + e.strerror) from e
             sleep(PWMOut.PWM_STAT_DELAY)
 
         # self._set_enabled(False) # This line causes a write error when trying to enable