config.c

在C8051F060上实现嵌入式系统ucos

#include "..\ucos-ii\includes.h"

#define SYSCLK 22118400





extern void SYSCLK_Init(void);
extern void Port_Init(void);
extern void Time2_Init(void);
extern void UART0_Init(void);

void config(void)
{	
	 WDTCN = 0xde;                          
	 WDTCN = 0xad;	

 	 SYSCLK_Init();
 	 Port_Init (); 
	 Time2_Init(); 	
	 UART0_Init();

}



void Time2_Init (void)
{
   char SFRPAGE_SAVE;

   SFRPAGE_SAVE = SFRPAGE;             // Preserve SFRPAGE

   SFRPAGE = TMR2_PAGE;

   TMR2CN = 0x00;                      // Timer in 16-bit auto-reload up timer
                                       // mode
   TMR2CF = 0x08;                      // SYSCLK is time base; no output;
                                       // up count only
   RCAP2 = - ((long) SYSCLK/1000);
   //次数为SYSTEMCLOCK/1000 系统每次时间为1/SYSTEMCLOCK 所以就得出进行一次益处计数为1/1000秒
   TMR2 = RCAP2;
   TR2= 1; 
   ET2 = 1;                            // Timer2 interrupt enabled
}

void SYSCLK_Init (void)
{
   char old_SFRPAGE = SFRPAGE; 
	 
   unsigned int i;                                 

   SFRPAGE = CONFIG_PAGE;              // Switch to Configuration Page

   OSCXCN = 0x67;                      // start external oscillator with
                                       // 22.1184MHz crystal on TB

   for (i=0; i <5000; i++) ;           // XTLVLD blanking interval (>1ms)

   while (!(OSCXCN & 0x80)) ;          // Wait for crystal osc. to settle

   //RSTSRC = 0x04;                      // enable missing clock detector reset
	 	
   CLKSEL = 0x01;                      // change to external crystal

   OSCICN = 0x83;                      // Enable internal oscillator	

   SFRPAGE = old_SFRPAGE;              // restore SFRPAGE
}


void PORT_Init (void)
{
	  char SFRPAGE_SAVE = SFRPAGE;  // Save Current SFR page     

    SFRPAGE   = CONFIG_PAGE;
    P2MDOUT   = 0x03;
	P0MDOUT   = 0x01;
	XBR0      = 0x05;
    XBR2      = 0x40;
    SFRPAGE = SFRPAGE_SAVE;    // Restore SFR page

}



//-----------------------------------------------------------------------------
// UART0_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// Configure the UART1 using Timer1, for <baudrate> and 8-N-1.
//
//-----------------------------------------------------------------------------
void UART0_Init (void)
{
   char old_SFRPAGE = SFRPAGE;

   SFRPAGE = UART0_PAGE;               // Switch to UART0 page

   SCON0   = 0x50;                     // SCON: mode 1, 8-bit UART, enable RX
   SSTA0 = 0x10;                       // Timer 1 generates UART0 baud rate and
                                       // UART0 baud rate divide by two disabled

   SFRPAGE = TIMER01_PAGE;             // Switch to Timer 0/1 page

   TMOD   = 0x20;                      // TMOD: timer 1, mode 2, 8-bit reload
   TH1    = -(SYSCLK/BAUDRATE/16);     // set Timer1 reload value for baudrate
   //此公式在数据文档240页
   TR1    = 1;                         // start Timer1
   CKCON |= 0x10;                      // Timer1 uses SYSCLK as time base
   PCON  |= 0x80;                      // SMOD = 1

   SFRPAGE = UART0_PAGE;               // Switch to UART0 page

   TI0    = 1;                         // Indicate TX ready

   SFRPAGE = old_SFRPAGE;              // restore SFRPAGE

}