SPI3：MOSI与MISO（即B4/B5）短接。如果从MISO返回的数值（b‘0123456789‘）等于MOSI的输出，则工作正常。
from pyb import SPI buf = bytearray(10) spi = SPI(3, SPI.MASTER, baudrate=9600000, polarity=1, phase=0, crc=0x07) data = spi.send_recv(b‘0123456789‘) spi.send_recv(b‘0123456789‘, buf) #spi.send_recv(buf, buf) print(repr(buf))
输出结果：未短接MOSI和MISO引脚时
>>> PYB: sync filesystems PYB: soft reboot bytearray(b‘\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff‘)
输出结果：短接MOSI和MISO引脚时
bytearray(b‘0123456789‘) bytearray(b‘0123456789‘)
原文：https://www.cnblogs.com/iBoundary/p/12530141.html