测试SPI

测试SPI

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')