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Use spidev for Jetson devices #242

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Use spidev for Jetson devices #242

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30 changes: 11 additions & 19 deletions RaspberryPi_JetsonNano/python/lib/waveshare_epd/epdconfig.py
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Original file line number Diff line number Diff line change
Expand Up @@ -97,35 +97,23 @@ class JetsonNano:
BUSY_PIN = 24

def __init__(self):
import ctypes
find_dirs = [
os.path.dirname(os.path.realpath(__file__)),
'/usr/local/lib',
'/usr/lib',
]
self.SPI = None
for find_dir in find_dirs:
so_filename = os.path.join(find_dir, 'sysfs_software_spi.so')
if os.path.exists(so_filename):
self.SPI = ctypes.cdll.LoadLibrary(so_filename)
break
if self.SPI is None:
raise RuntimeError('Cannot find sysfs_software_spi.so')

import spidev
import Jetson.GPIO

self.GPIO = Jetson.GPIO
self.SPI = spidev.SpiDev()

def digital_write(self, pin, value):
self.GPIO.output(pin, value)

def digital_read(self, pin):
return self.GPIO.input(self.BUSY_PIN)
return self.GPIO.input(pin)

def delay_ms(self, delaytime):
time.sleep(delaytime / 1000.0)

def spi_writebyte(self, data):
self.SPI.SYSFS_software_spi_transfer(data[0])
self.SPI.writebytes(data)

def module_init(self):
self.GPIO.setmode(self.GPIO.BCM)
Expand All @@ -134,12 +122,16 @@ def module_init(self):
self.GPIO.setup(self.DC_PIN, self.GPIO.OUT)
self.GPIO.setup(self.CS_PIN, self.GPIO.OUT)
self.GPIO.setup(self.BUSY_PIN, self.GPIO.IN)
self.SPI.SYSFS_software_spi_begin()

# SPI device, bus = 3, device = 0
self.SPI.open(3, 0)
self.SPI.max_speed_hz = 32_000_000
self.SPI.mode = 0b00
return 0

def module_exit(self):
logger.debug("spi end")
self.SPI.SYSFS_software_spi_end()
self.SPI.close()

logger.debug("close 5V, Module enters 0 power consumption ...")
self.GPIO.output(self.RST_PIN, 0)
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4 changes: 2 additions & 2 deletions RaspberryPi_JetsonNano/python/setup.py
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Original file line number Diff line number Diff line change
@@ -1,10 +1,10 @@
import sys, os
from setuptools import setup

dependencies = ['Pillow']
dependencies = ['Pillow', 'spidev']

if os.path.exists('/sys/bus/platform/drivers/gpiomem-bcm2835'):
dependencies += ['RPi.GPIO', 'spidev']
dependencies += ['RPi.GPIO']
else:
dependencies += ['Jetson.GPIO']

Expand Down