piectrl_nonbios.c

介绍利用DSP2818的DA产生PWM波的方法

/**********************************************************************
* Function: InitPieCtrl()                                             *
* Description: Initializes and enables the PIE on the F280x.          *
* Device: TMS320F2808, TMS320F2806, TMS320F2801                       *
* Author: David M. Alter, Texas Instruments Inc.                      *
* Function Prototype: void InitPieCtrl(void);                         *
* Useage: InitPieCtrl();                                              *
* Input Parameters: none                                              *
* Return Value: none                                                  *
* Notes:                                                              *
* 1) This function copies the PIE vector table to the PIE RAM.        *
* 2) All PIE interrupt flags are cleared, and all PIE interrupts are  *
*    left disabled.                                                   *
* 3) This function uses the DSP280x Peripheral Header files, TI       *
*    literature #SPRC191.                                             *
* History:                                                            *
*   02/07/06 - original (D. Alter)                                    *
**********************************************************************/
#include "DSP280x_Device.h"					// Peripheral address definitions
#include "f2808_HRPWM_DAC.h"				// Include file specific to this project

void InitPieCtrl(void)
{
/*** Disable interrupts ***/
	asm(" SETC INTM, DBGM");			// Disable global interrupts

/*** Initialize the PIE_RAM ***/
	PieCtrlRegs.PIECTRL.bit.ENPIE = 0;	// Disable the PIE
	asm(" EALLOW");						// Enable EALLOW protected register access
	memcpy(&PieVectTable, &PieVectTableInit, 256);
	asm(" EDIS");						// Disable EALLOW protected register access

/*** Disable all PIE interrupts ***/
	PieCtrlRegs.PIEIER1.all =  0x0000;
	PieCtrlRegs.PIEIER2.all =  0x0000;
	PieCtrlRegs.PIEIER3.all =  0x0000;
	PieCtrlRegs.PIEIER4.all =  0x0000;
	PieCtrlRegs.PIEIER5.all =  0x0000;
	PieCtrlRegs.PIEIER6.all =  0x0000;
	PieCtrlRegs.PIEIER7.all =  0x0000;
	PieCtrlRegs.PIEIER8.all =  0x0000;
	PieCtrlRegs.PIEIER9.all =  0x0000;
	PieCtrlRegs.PIEIER10.all = 0x0000;
	PieCtrlRegs.PIEIER11.all = 0x0000;
	PieCtrlRegs.PIEIER12.all = 0x0000;

/*** Clear any potentially pending PIEIFR flags ***/
	PieCtrlRegs.PIEIFR1.all  = 0x0000;
	PieCtrlRegs.PIEIFR2.all  = 0x0000;
	PieCtrlRegs.PIEIFR3.all  = 0x0000;	
	PieCtrlRegs.PIEIFR4.all  = 0x0000;
	PieCtrlRegs.PIEIFR5.all  = 0x0000;
	PieCtrlRegs.PIEIFR6.all  = 0x0000;
	PieCtrlRegs.PIEIFR7.all  = 0x0000;
	PieCtrlRegs.PIEIFR8.all  = 0x0000;
	PieCtrlRegs.PIEIFR9.all  = 0x0000;
	PieCtrlRegs.PIEIFR10.all = 0x0000;
	PieCtrlRegs.PIEIFR11.all = 0x0000;
	PieCtrlRegs.PIEIFR12.all = 0x0000;

/*** Acknowlege all PIE interrupt groups ***/
	PieCtrlRegs.PIEACK.all = 0xFFFF;

/*** Enable the PIE ***/
	PieCtrlRegs.PIECTRL.bit.ENPIE = 1;		// Enable the PIE

} //end of InitPieCtrl()


/*** end of file *****************************************************/