ʾʹõӲԴ
LPUART1 TX      --   PA9  
LPUART1 RX      --   PA10
LED1             --   PB4

LPUART1ͨŲ:
  -- :   9600
  -- ַȣ8bits
  -- ֹͣλ  1bit
  -- żУ飺
  -- Ӳأֹ


ʾʾLPUART1 StopģʽѵḶ́ԴΪƥַ
1ϵͳʱʹRCH48MHz
2LPUART1GPIOϨLED1
3ʼLPUART1ʱԴΪRCH48MHz
4LPUART1Ϊַƥ份ѣƥַΪ0x03
5Stopģʽǰ豣֤շǿձ־RXNEΪ0־OREΪ0
6Stopģʽȴݣ
7յƥַStopģʽѣжнַƥ־㣬洢յƥַ
8˳StopģʽϵͳʱԶָΪRCHرLPUARTʹܣLED1
9ѽյƥַ
