SPI

sunlichao

1. from machine import Pin, SPI
   
2. # construct an SPI bus on the given pins
   
3. # polarity is the idle state of SCK
   
4. # phase=0 means sample on the first edge of SCK, phase=1 means the second
   
5. spi = SPI(baudrate=100000, polarity=1, phase=0, sck=Pin(0), mosi=Pin(2), miso=Pin(4))
   
6. spi.init(baudrate=200000) # set the baudrate
   
7. spi.read(10)            # read 10 bytes on MISO
   
8. spi.read(10, 0xff)      # read 10 bytes while outputing 0xff on MOSI
   
9. buf = bytearray(50)     # create a buffer
   
10. spi.readinto(buf)       # read into the given buffer (reads 50 bytes in this case)
    
11. spi.readinto(buf, 0xff) # read into the given buffer and output 0xff on MOSI
    
12. spi.write(b'12345')     # write 5 bytes on MOSI
    
13. buf = bytearray(4)      # create a buffer
    
14. spi.write_readinto(b'1234', buf) # write to MOSI and read from MISO into the buffer
    
15. spi.write_readinto(buf, buf) # write buf to MOSI and read MISO back into buf

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