dspinit.c

来自「这个UCOS II在TI2400DSP平台上的移植源代码」· C语言 代码 · 共 48 行

#include "f240_c.h"


void DSPInit(void)
{
/*** configure system control and status registers ***/
	*SYSCR = 0x4000;		/* CLKOUT as I/O */
	
/*** configure PLL clock module ***/                                                                            
	*CKCR0 = 0x0041;		/* CPUCLK=CLKIN, SYSCLK=CPUCLK/2 */ 
	*CKCR1 = 0x0060;		/* CKINF=20MHz */    
	
/*** setup watch dog ***/
	*WDCR = 0x006F;			/* clear flag, disable if HPO set, max period */
	*WDKEY = 0x5555;
	*WDKEY = 0xAAAA;
	*WDCR = 0x006F;  
	
/*** setup external memory interface ***/
	WSGR = 0x0007;			/* address invisible, one wait state */  
	
/*** configure memory structure with CNF and GREG ***/
	/* default */
		
/*** configure I/O port ***/
	*OCRA = 0x0000;			/* IOPA, IOPB all as I/O */
	*PADATDIR = 0x0000;		/* IOPA all as input */
	*PBDATDIR = 0x0000;		/* IOPB all as input */
	*OCRB = 0x000C;			/* IOPC all as I/O */
	*PCDATDIR = 0xFFFF;		/* IOPC all output as high */	

/*** setup timer 2 ***/
	*T2CON = 0x1200;		/* stop immediately on emulation suspend, as common timer */          
    *T2CNT = 0x0000;
    *T2PR = 50000;			/* 10ms */  
    
/*** setup interrupt ***/
	*IMR = 0x0000;
	*IFR = 0x003F;			/* clear any pending core interrupt */
	
/*** setup event manager interrupt ***/    
	*EVIFRA = 0xFFFF;
	*EVIFRB = 0xFFFF;
	*EVIFRC = 0xFFFF;
	*EVIMRA = 0x0000;
    *EVIMRB = 0x0001;		/* T2PINT enable */ 
	*EVIMRC = 0x0000;  	
}