模拟UART

TX PA0 , BTM -> EBUS -> DMA(将发送的数据解析为电平值放到GPIO_OUT执行)
RX_PA1 , IOPORT 打开TIMS计数，TIMS->EBUS->DMA(DMA 读取电平状态存入DMA结果),

波特率计算

BUAD9600: T = 104.16us
uart_config.txBaud = 0x33;   /*(txBaud+1)/8M *16 = 104.16us, txBaud =  51*/
uart_config.rxBaud = 0x28AF;  /*(txBaud+1)/100M = 104.16us, txBaud =  10415*/

BUAD19200: T = 52.08us
uart_config.txBaud = 0x19;   /*(txBaud+1)/8M *16 = 52.08us, txBaud =  25*/
uart_config.rxBaud = 0x1457;  /*(txBaud+1)/100M = 52.08us, txBaud =  5207*/
  
BUAD115200: T = 8.68us
uart_config.txBaud = 0x3;   /*(txBaud+1)/8M *16 = 8.68us, txBaud =  3*/
uart_config.rxBaud = 0x363;  /*(txBaud+1)/100M = 8.68us, txBaud =  867*/
