k210 串口接收状态机两帧头 接收三个字节 （自己随便乱写的勿看）

两字符帧头 接收三个字节

想接收多少就改if usart_I.Cnt == 3 : 把3改成你想要的就行长度就行

if usart_I.Cnt == 3 :

总函数

#************************************************************************#
fm.register(9, fm.fpioa.UART1_TX, force=True)
fm.register(10, fm.fpioa.UART1_RX, force=True)
uart1 = UART(UART.UART1, 115200, 8, 1, 0, timeout=1000, read_buf_len=4096)

class usart_I:
 Read_onebytes = 0
 Read_onebyte = [0]
 Read_Buf = [0]*1024
 Cnt = 0
 recvState  = 0
def usart1_protocol():
 usart_I.Read_onebytes  = uart1.read(1)
 if usart_I.Read_onebytes :
  usart_I.Read_onebyte = (usart_I.Read_onebytes).decode('utf-8')
  if usart_I.recvState == 0 :
   if usart_I.Read_onebyte == '#' :
    usart_I.recvState = 1
  elif usart_I.recvState == 1 :
   if usart_I.Read_onebyte == '@' :
    usart_I.recvState = 2
    usart_I.Read_Buf=[0]*1024
  elif usart_I.recvState == 2 :
   usart_I.Read_Buf[usart_I.Cnt] = usart_I.Read_onebyte
   usart_I.Cnt = usart_I.Cnt+1
   if usart_I.Cnt == 3 :
    usart_I.Cnt = 0
    usart_I.recvState = 0
    #print(usart_I.Read_Buf[0],usart_I.Read_Buf[1],usart_I.Read_Buf[2])



#************************************************************************#

接收十六进制的两帧头 接收三个字节

#************************************************************************#
fm.register(9, fm.fpioa.UART1_TX, force=True)
fm.register(10, fm.fpioa.UART1_RX, force=True)
uart1 = UART(UART.UART1, 115200, 8, 1, 0, timeout=1000, read_buf_len=4096)

class usart_I:
 Read_onebytes = 0
 Read_onebyte = [0]
 Read_Buf = [0]*1024
 Cnt = 0
 recvState  = 0
def usart1_protocol():
 usart_I.Read_onebytes  = uart1.readchar()
 if usart_I.Read_onebytes :
  #usart_I.Read_onebyte = (usart_I.Read_onebytes).decode('utf-8')
  usart_I.Read_onebyte = (usart_I.Read_onebytes)
  if usart_I.recvState == 0 :
   if usart_I.Read_onebyte == 0x01 :
    usart_I.recvState = 1
  elif usart_I.recvState == 1 :
   if usart_I.Read_onebyte == 0x02:
    usart_I.recvState = 2
    usart_I.Read_Buf=[0]*1024
  elif usart_I.recvState == 2 :
   usart_I.Read_Buf[usart_I.Cnt] = usart_I.Read_onebyte
   usart_I.Cnt = usart_I.Cnt+1
   if usart_I.Cnt == 3 :
    usart_I.Cnt = 0
    usart_I.recvState = 0
    print(usart_I.Read_Buf[0],usart_I.Read_Buf[1],usart_I.Read_Buf[2])




#************************************************************************#