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add verbose logging for failed SPI access

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This commit is contained in:
txoof 2020-01-11 11:38:33 +01:00
commit 5370960692
1 changed files with 9 additions and 3 deletions
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12
RaspberryPi_and_JetsonNano/python/lib/waveshare_epd/epdconfig.py
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@ -42,12 +42,18 @@ class RaspberryPi:
def __init__(self): def __init__(self):
import spidev import spidev
import RPi.GPIO import RPi.GPIO
self.GPIO = RPi.GPIO self.GPIO = RPi.GPIO
# SPI device, bus = 0, device = 0 # SPI device, bus = 0, device = 0
self.SPI = spidev.SpiDev(0, 0) try:
self.SPI = spidev.SpiDev(0, 0)
except PermissionError as e:
logging.critical(f'Error initing SPI {e}')
logging.ciritcal('The current user may not have access to /dev/spidev*')
logging.critical('Remedy this by adding the user to the spi access group:')
logging.critical('$ sudo groupadd <username> spi')
sys.exit(1)
def digital_write(self, pin, value): def digital_write(self, pin, value):
self.GPIO.output(pin, value) self.GPIO.output(pin, value)