Comments (3)
Could you post a minimal code example to reproduce this? I've just tested this with the following code and verified via my scope that it's taken effect:
import time
import sys
from spidev import SpiDev
dev = SpiDev(0,0)
dev.max_speed_hz = 10
try:
while True:
dev.writebytes([1,2,4,8,16,32,64,128])
time.sleep(0.001)
except KeyboardInterrupt:
sys.exit(0)
I believe the speeds, in hz, snap to the nearest available speed due to the way the hardware works. It could be that you're trying to make a change too small, so it's just snapping to 64Mhz ( should be 62.5Mhz )
A table of speeds is listed here: https://www.raspberrypi.org/documentation/hardware/raspberrypi/spi/README.md
from py-spidev.
I'm using the SPIDev through Adafruit Python ILI9341 and GPIO Libraries
Adaftuit GPIO Python Library: https://github.com/adafruit/Adafruit_Python_GPIO
Adafruit Python ILI9341: Library: https://github.com/adafruit/Adafruit_Python_ILI9341
I'm running extended version of this example code:https://github.com/adafruit/Adafruit_Python_ILI9341/blob/master/examples/image.py
Basically, Adafruit Python GPIO SPI provides a wrapper for the SPIDev
Changing the clock speed of the Python SPIDev wrapper does not change the clock speed which I confirmed with logic analyzer.
My guess was that the problem comes from the SPIDev library.
I will test with your example code and confirm if it works with me.
From what
from py-spidev.
Hi,
I confirm that it works well through the original SPIDev. It seems that the Adafruit wrapper messed it up somehow.
Case closed.
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