Add timout loop after exporting the PWM pin.

[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 e95a1e627c74c4d1ea4e7f10a4343fe5b450821e..ae4da4b78124eefbd15b5b35723efc984ac5f0bf 100644 (file)
--- a/src/adafruit_blinka/microcontroller/generic_linux/sysfs_pwmout.py
+++ b/src/adafruit_blinka/microcontroller/generic_linux/sysfs_pwmout.py
@@ -31,6 +31,11 @@ class PWMOut:
     # Delay between check for scucessful PWM export on open (100ms)
     PWM_STAT_DELAY = 0.1
 
     # 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
+    # Delay between check for scucessful PWM export on open (100ms)
+    PWM_STAT_DELAY = 0.1
+

     # Sysfs paths
     _sysfs_path = "/sys/class/pwm/"
     _channel_path = "pwmchip{}"
     # Sysfs paths
     _sysfs_path = "/sys/class/pwm/"
     _channel_path = "pwmchip{}"


@@ -121,13 +126,16 @@ class PWMOut:
         for i in range(PWMOut.PWM_STAT_RETRIES):
             try:
                 with open(
         for i in range(PWMOut.PWM_STAT_RETRIES):
             try:
                 with open(

-                    os.path.join(channel_path, self._pin_path.format(self._pwmpin), "period"), 'w'
+                    os.path.join(
+                        channel_path, self._pin_path.format(self._pwmpin), "period"
+                    ),
+                    "w",

                 ):
                 ):

-                    print('#### okay ####')

                     break
             except IOError as e:
                     break
             except IOError as e:

-                if e.errno != EACCES or (e.errno == EACCES and i == PWMOut.PWM_STAT_RETRIES - 1):
-                    print('#### catch ####')
+                if e.errno != EACCES or (
+                    e.errno == EACCES and i == PWMOut.PWM_STAT_RETRIES - 1
+                ):

                     raise PWMError(e.errno, "Opening PWM period: " + e.strerror)
             sleep(PWMOut.PWM_STAT_DELAY)
 
                     raise PWMError(e.errno, "Opening PWM period: " + e.strerror)
             sleep(PWMOut.PWM_STAT_DELAY)