pwm.c

在ccs编程环境下

#include "IQmathLib.h"         /* Include header for IQmath library */
#include "DSP28_Device.h"
#include "pwm.h"
#include "f28xbmsk.h"

void PWM_Init(PWMGEN *p) 
{       

		EALLOW;                       /* Enable EALLOW */
		GpioMuxRegs.GPAMUX.all = 0x003F; 
		EDIS;                         /* Disable EALLOW */

		EvaRegs.T1PR = p->n_period;             /* Init Timer 1 period Register  */
//		EvaRegs.T1CMPR = p->n_period/2;  
		EvaRegs.T1CNT = 0x000;
        EvaRegs.T1CON.all = PWM_INIT_STATE; /* Symmetrical Operation */

		// Drive T1/T2 PWM by compare logic
		EvaRegs.GPTCONA.bit.TCOMPOE = 1;
		// Polarity of GP Timer 1 Compare = Active low
		EvaRegs.GPTCONA.bit.T1PIN = 1;
		// Polarity of GP Timer 2 Compare = Active high
		EvaRegs.GPTCONA.bit.T2PIN = 2;
		// set pwm int with adc_end
	    EvaRegs.GPTCONA.bit.T1TOADC = 1;       // Enable EVASOC in EVA
		//由T1的定时器下溢中断启动AD
		EvaRegs.CMPR1 = (p->n_period>>1);
		EvaRegs.CMPR2 = (p->n_period>>1);
		EvaRegs.CMPR3 = (p->n_period>>1);

		EvaRegs.ACTRA.all = ACTR_INIT_STATE;                

		EvaRegs.DBTCONA.all = DBTCON_INIT_STATE;//0xa00+0x80+0x40+0x20+0x14  :2.774us                                  
//		EvaRegs.DBTCONA.all = 0x0ff8;//0xa00+0x80+0x40+0x20+0xc                                    

		EvaRegs.COMCONA.all = 0xA600;


}


//#pragma CODE_SECTION(PWM_Update, "time_pwm_updateFuncs")
void PWM_Update(PWMGEN *p) 
{       
		int  m_period;
        long tmp;


		m_period = p->n_period-1;
        EvaRegs.T1PR = m_period; //0x249F 

        tmp = (long)(m_period*p->Mfunc_c1);
        p->CMPR1_TEMP = (int)(tmp>>14) ;

        tmp = (long)(m_period*p->Mfunc_c2);
        p->CMPR2_TEMP = (int)(tmp>>14);

        tmp = (long)(m_period*p->Mfunc_c3);
        p->CMPR3_TEMP = (int)(tmp>>14) ;


	if (p->CMPR1_TEMP < 0)
		p->CMPR1_TEMP = 0;
	if (p->CMPR1_TEMP > m_period)
		p->CMPR1_TEMP = m_period;
	if (p->CMPR2_TEMP < 0)
		p->CMPR2_TEMP = 0;
	if (p->CMPR2_TEMP > m_period)
		p->CMPR2_TEMP = m_period;
	if (p->CMPR3_TEMP < 0)
		p->CMPR3_TEMP = 0;
	if (p->CMPR3_TEMP > m_period)
		p->CMPR3_TEMP = m_period;
		
        
        EvaRegs.CMPR1 = p->CMPR1_TEMP;
        EvaRegs.CMPR2 = p->CMPR2_TEMP;
        EvaRegs.CMPR3 = p->CMPR3_TEMP;
}


/*
void F28X_EV1_PWM_Update(PWMGEN *p) 
{       
		Uint16  m_period;
		Uint32 tmp;

		tmp = (Uint32)(p->n_period);
		tmp *= p->Mfunc_p;
        m_period = (Uint16)(tmp>>16) + (Uint16)(p->n_period>>1);
        EvaRegs.T1PR = m_period;  

		tmp = (Uint32)(m_period);
		tmp *= p->Mfunc_c1;
        EvaRegs.CMPR1 = (Uint16)(tmp>>16) + (Uint16)(m_period>>1);

		tmp = (Uint32)(m_period);
		tmp *= p->Mfunc_c2;
        EvaRegs.CMPR2 = (Uint16)(tmp>>16) + (Uint16)(m_period>>1);

		tmp = (Uint32)(m_period);
		tmp *= p->Mfunc_c3;
        EvaRegs.CMPR3 = (Uint16)(tmp>>16) + (Uint16)(m_period>>1);
        
}

*/