UART mit dem F330 von SiLabs

**Mr Bean** · 08.06.2009, 06:19

So, guten Morgen!

Also hier nun noch der komplette code:

Code:

#include <c8051F330.h>
#include <stdio.h>

#define SYSCLK			24500000
#define BAUDRATE		115200
#define RX_length		25

//-----------------------------------------------------------------------------
// Global Variables
//-----------------------------------------------------------------------------

//bit TX_ready;						//True = OK zur Übertragung
//char *TX_ptr;						//pointer auf zu übermittelnden String

bit RX_ready;						//True = string empfangen
char RX_buf[RX_length];				//Array als Eingangsbuffer anlegen
unsigned char the_char;				//zwischenspeicher

sfr  SBUF = 0x99;


//-----------------------------------------------------------------------------
// Function Prototypes
//-----------------------------------------------------------------------------

void OSCILLATOR_Init (void);
void UART0_Init (void);
void PORT_Init (void);
void UART0_ISR (void);
void Print_String (char pstring[]);
char nb_getkey ();
char b_getkey ();

//-----------------------------------------------------------------------------
// main Routine
//-----------------------------------------------------------------------------

void main (void)
{
	unsigned char c;
	
	// Disable Watchdog timer
   	PCA0MD &= ~0x40;                    // WDTE = 0 (clear watchdog timer
                                       // enable)
   	OSCILLATOR_Init ();                 // Initialize Oscillator
	PORT_Init();                        // Initialize Port I/O
	UART0_Init ();						// Initialize UART0

	EA = 1;								//Interrupts global freigeben
	//ES0 = 1;							//UART0 interrupt freigeben

	while(1)
	{
		c= b_getkey ();
		putchar(c); 
	}
}

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

//-----------------------------------------------------------------------------
// OSCILLATOR_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// This routine initializes the system clock to use the internal 24.5MHz
// oscillator as its clock source.  Also enables missing clock detector reset.
//
//-----------------------------------------------------------------------------
void OSCILLATOR_Init (void)
{
   OSCICN |= 0x03;                     // Configure internal oscillator for
                                       // its maximum frequency
   RSTSRC  = 0x04;                     // Enable missing clock detector
}

//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// P0.4    digital    push-pull     UART TX
// P0.5    digital    open-drain    UART RX
//
//-----------------------------------------------------------------------------
void PORT_Init (void)
{
   P0SKIP  |= 0x01;                    // Skip P0.0 for external VREF
   P1MDIN  |= 0xEF;                    // Configure P1.4 as analog input.
   P0MDOUT |= 0x10;                    // enable UTX as push-pull output
   XBR0    = 0x01;                     // Enable UART on P0.4(TX) and P0.5(RX)
   XBR1    = 0x40;                     // Enable crossbar and weak pull-ups
}

//-----------------------------------------------------------------------------
// UART0_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// Configure the UART0 using Timer1, for <BAUDRATE> and 8-N-1.
//
//-----------------------------------------------------------------------------
void UART0_Init (void)
{
   SCON0 = 0x10;                       // SCON0: 8-bit variable bit rate
                                       //        level of STOP bit is ignored
                                       //        RX enabled
                                       //        ninth bits are zeros
                                       //        clear RI0 and TI0 bits
   if (SYSCLK/BAUDRATE/2/256 < 1) {
      TH1 = -(SYSCLK/BAUDRATE/2);
      CKCON &= ~0x0B;                  // T1M = 1; SCA1:0 = xx
      CKCON |=  0x08;
   } else if (SYSCLK/BAUDRATE/2/256 < 4) {
      TH1 = -(SYSCLK/BAUDRATE/2/4);
      CKCON &= ~0x0B;                  // T1M = 0; SCA1:0 = 01
      CKCON |=  0x09;
   } else if (SYSCLK/BAUDRATE/2/256 < 12) {
      TH1 = -(SYSCLK/BAUDRATE/2/12);
      CKCON &= ~0x0B;                  // T1M = 0; SCA1:0 = 00
   } else {
      TH1 = -(SYSCLK/BAUDRATE/2/48);
      CKCON &= ~0x0B;                  // T1M = 0; SCA1:0 = 10
      CKCON |=  0x02;
   }

   TL1 = TH1;                          // Init Timer1
   TMOD &= ~0xf0;                      // TMOD: timer 1 in 8-bit autoreload
   TMOD |=  0x20;
   TR1 = 1;                            // START Timer1
   TI0 = 1;                            // Indicate TX0 ready
}

/*
void UART0_ISR (void) interrupt 4
{
	static unsigned char RX_index = 0;	//receive buffer index
	unsigned char the_char;				//zwischenspeicher
	
	Print_String ("In ISR...");			//Debugausgabe auf UART 
	//RI0 = 0;
	if (RI0==1)
	{
		
		the_char = SBUF0;
		RX_buf[RX_index] = the_char;	//Byte in array speichern
		

		if(RX_index < (RX_length-2))
		{
			RX_index++;
		}
		else
		{
			RX_index = 0;
			RX_ready = 1;
			RX_buf[RX_index-1] = '\0';
		}
		

	}
}
*/
void Print_String (char pstring[])
{
   unsigned char i = 0;
   while (pstring[i])
   {
      putchar(pstring[i++]);
   }
}

char nb_getkey () 
{
	
   char c;
   int i;
	
	//Print_String ("In nb_getkey...");	

   while(!RI0 && i++<100);
   if(RI0)
   {
      c = SBUF;
      RI0 = 0;
   }
   else
      c = '\3';
   return (c);
}
char b_getkey () 
{
	
   char c;
Print_String ("In b_getkey...");
	while (!RI0);
	
   c = SBUF;
   RI0 = 0;
   return (c);
}