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Keil C51 character echo test for UART1

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From Keil C51 examples, TEST.C: ISD51 Demo for TI MSC 1210.
Polled (non-interrupt) mode.

Work-around for dropped-characters related to stop-bit problem: Clear SCON1.5 (or SM2_1).

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  1. void TestSerial(void)  
  2. { 
  3.   // for UART1, use TI_1, RI_1 and SBUF1.
  4.   // for UART0, use TI,   RI   and SBUF.
  5.  
  6.   char c = 'A';
  7.  
  8.   TI_1 = 1;
  9.   while (1) // forever. 
  10.   {
  11.     if (RI_1) // if a char is ready...
  12.     {
  13.       c = SBUF1; // Read a char.
  14.       RI_1 = 0;  // Indicate that we've read the char.
  15.     }
  16.     while (!TI_1) {;} // wait for TX to be ready.
  17.     TI_1 = 0;  
  18.     SBUF1 = c; // Send a char
  19.   }
  20. }

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