uarttest.c

来自「C8051F BTF005實驗板範例程式」· C语言 代码 · 共 82 行

//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include <c8051f000.h>
#include <stdio.h>
#include <intrins.h>
//-----------------------------------------------------------------------------
// Function PROTOTYPES
//-----------------------------------------------------------------------------
void UART0_Init (void);
void SYSCLK_Init (void);
void PORT_Init (void);
//-----------------------------------------------------------------------------
// Global CONSTANTS
//-----------------------------------------------------------------------------
#define BAUDRATE     115200              // Baud rate of UART in bps
#define SYSCLK       11059200            // SYSCLK frequency in Hz
//-----------------------------------------------------------------------------
// MAIN Routine
//-----------------------------------------------------------------------------
void main(void){

		WDTCN = 0xde;                       // disable watchdog timer
		WDTCN = 0xad;
        SYSCLK_Init ();
		PORT_Init ();
		UART0_Init() ;                      // initialize crossbar and GPIO
         while (1)
         { 

            printf ("TESTING UART0/USB！\n"); 
           
         }
    

}
//-----------------------------------------------------------------------------
// Initialization Subroutines
//-----------------------------------------------------------------------------


//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------
void PORT_Init (void)
{

    	XBR0 = 0x27;                    	// XBAR0: Initial Reset Value
    	XBR1 = 0x00;	                    // XBAR1: Initial Reset Value
    	XBR2 = 0x5c;                    	// XBAR2: Initial Reset Value
    	PRT0CF = 0x14;                      // Output configuration for P0 
      	PRT1CF = 0x10;                      // Output configuration for P3 
       	PRT3CF = 0x01;                      // Output configuration for P3 

}
//-----------------------------------------------------------------------------
// SYSCLK_Init
//-----------------------------------------------------------------------------
void SYSCLK_Init (void)
{
      unsigned int i;                            // delaynms counter
      OSCXCN = 0x67;                      // start external oscillator with
      for (i=0; i < 256; i++) ;           // XTLVLD blanking interval (>1ms)
      while (!(OSCXCN & 0x80)) ;          // Wait for crystal osc. to settle
      OSCICN = 0x88;                      // select external oscillator as SYSCLK                              
}
//-----------------------------------------------------------------------------
// UART0_Init
//-----------------------------------------------------------------------------
void UART0_Init (void)
{
   SCON    = 0x50;                     // SCON: mode 1, 8-bit UART, enable RX
   TMOD    = 0x20;                     // TMOD: timer 1, mode 2, 8-bit reload
   TH1    = -(SYSCLK/BAUDRATE/16);     // set Timer1 reload value for baudrate
   TR1    = 1;                         // start Timer1
   CKCON |= 0x10;                      // Timer1 uses SYSCLK as time base
   PCON  |= 0x80;                      // SMOD = 1
   TI     = 1;                         // Indicate TX ready
}