Jane Medium ： This paper gives MicroPython Kernel Development Notes ： Experimental tasks are embedded in the book Medium UART Part of the software use cases .
key word：MicroPython,MM32F3277
stay MM32F3277 in Eight serial ports , The corresponding serial port is ：
UART port (RX,TX)：
UART1：PA10, PA9
UART2：PA3,PA2
UART3：PB11,PB10
UART4：PC11,PC10
UART5：PD2,PC12
UART6：PC7,.PC6
UART7：PE7,PE8
UART8：PD1,PD0
Because the first serial port （UART0） Used for interactive interface （REPL）, The serial port shown for developers is from UART2 After the serial port .
The following code initializes UART2, The baud rate is 115200, every other 10ms send out 0x55（ Corresponding characters ‘U’） data . The serial port sends data through write() Function call to implement , Send one byte at a time .
from machine import Pin,UART
import utime
uart2 = UART(1, 115200)
print('Test UART.')
while True:
_ = uart2.write(b'U')
utime.sleep_ms(10)
Use oscilloscope to test PA2（TX2） The output waveform of ：
▲ chart 1.1.1 PA2(TX2) Measure the output waveform Use a short circuiting device to RXD3 And RXD1 come together , Also is to REPL Receive port of RXD1 Connected to the UART3 Receive port of .
The following program shows how to judge whether a character is received in the serial port , And read the character and store it in the memory buffer . When a carriage return character is received （0xd） after , The received string is converted into an integer and displayed .
from machine import Pin,UART
import utime
uart2 = UART(2, 115200)
print('Test UART.')
buf = bytes(0)
while True:
if uart2.any():
buf = buf + uart2.read(uart2.any())
if buf[-1] == 13:
print(int(buf))
buf = bytes(0)
utime.sleep_ms(10)
The running results are as follows . stay Thonny Enter the number on the interactive interface and press enter , Program variable output corresponding number . If the input character contains non numeric characters , Finally, the program returns with an error .
>> Reset MicroPython...
>> Wait for MicroPython coming back...
>> Download MicroPython : 33 lines/707 characters.
>> -------------------------------------------------------------------------
Test UART.
333
3333
123
Traceback (most recent call last):
File "<stdin>", line 22, in <module>
ValueError: invalid syntax for integer
>>>
This paper gives MicroPython Kernel Development Notes ： Experimental tasks are embedded in the book Medium UART Part of the software use cases .
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