[SOLVED] SPI send problem

[ajie_dirgantara]

I've done :

Code: Select all

spi = pyb.SPI(2, pyb.SPI.MASTER, prescaler = 2, polarity = 0, phase = 0, bits = 8) 
buf=bytearray(3)
buf[0]=0x01
buf[1]=0x02
buf[2]=0x03
spi.send(buf[0])
spi.send(buf[1])
spi.send(buf[2])

but why is that the result in logic analyzer is different from :

Code: Select all

spi = pyb.SPI(2, pyb.SPI.MASTER, prescaler = 2, polarity = 0, phase = 0, bits = 8) 
buf=bytearray(3)
buf[0]=0x01
buf[1]=0x02
buf[2]=0x03
spi.send(buf)

in the second code, there are some additional clock on SCK pin, so the byte sequence is 0x00,0x00,0x00,0x01,0x02,0x03 instead of just 0x01,0x02,0x03

the logic should be equal right?

[ajie_dirgantara]

ok, the problem solved by adding spi.deinit() everytime I want to do spi.recv()