SPI CE0 bounce problem
MikeD2-mnb opened this issue · comments
SPIDEV Ver 3.4
Python 3.7.3 (default, Jul 25 2020, 13:03:44)
Running On raspberry pi B
I've found a very short spurious low pulse from CS0 (CS1 not checked) after sending 4 bytes of data using spi.xfer() function. Whilst this would not normally be a problem, this is setting communication alarms in the chip that I'm talking to. This second pulse is occurring after the CS line goes high, about 4 bytes later (equivalent time) .
How can this be eliminated?
spi = spidev.SpiDev()
spi.open(0,0)
spi.max_speed_hz = 1000000
spi.mode = 0
Top trace shows the burst of the SCLK being 8 bits x 4 bytes, lower trace is the CE0 line, showing the second pulse which should not be there...
(FYI Horizontal is 20uS per div approximately. ) (old analogue scope...)
Mike
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