tpu_mcpwm.c

mpc564 时钟中断 时钟中断

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/****************************************************************************/
/* FILE NAME: tpu_mcpwm.c                     COPYRIGHT (c) MOTOROLA 2002 	*/
/* VERSION: 1.0                                   All Rights Reserved     	*/
/*                                                                        	*/
/* DESCRIPTION: This file contains the TPU MCPWM functions. These functions */
/* allow you to completely control TPU channels running the MCPWM function. */
/* They provide a simple interface requiring the minimum amount of        	*/
/* configuration by the user.                                             	*/
/*==========================================================================*/
/* HISTORY           ORIGINAL AUTHOR: Mario Ramiro Perez II                 */
/*                                                                        	*/
/* REV      AUTHOR         DATE       DESCRIPTION OF CHANGE                 */
/* ---   -----------     ---------    ---------------------                 */
/* 1.0   Mario R. Perez  24 Sep 02    Initial version of function.          */
/****************************************************************************/

#include "tpu_mcpwm.h"
#include "mpc500_util.h"


/***************************************************************************************
FUNCTION      : tpu_mcpwm_master_init

PURPOSE       : To initialize a TPU channel to run the MCPWM function.//多通道pwm

INPUTS NOTES  : This function has 5 parameters:

            *tpu          : This is a pointer to the TPU3 module to use. It is of type 
            				TPU3_tag which is defined in m_tpu3.h.
            channel       : This is the TPU channel number of the MCPWM master channel.  
            				The master must be assigned the lowest channel number of all 
            				MCPWM channels.  
            priority      : This is the priority to assign to the channel.  This 
            				parameter should be assigned a value of:
                            TPU_PRIORITY_HIGH, TPU_PRIORITY_MIDDLE or TPU_PRIORITY_LOW.
			period        : This defines the period of the PWM output in TCR1 timebase
							clocks.	period < $4000. 
			irq_rate 	  :	This determines the frequency of periodic interrupt requests
							to the host CPU. Any 8 bit value is valid.  If the irq_rate 
							= 0 then an interrupt request is generated every 256 PWM 
							periods.
							
EXTRA NOTES  : The MCPWM function Master channel has 1 parameter which is updated by the TPU:

			period_count  :	This parameter is used by the TPU as a PWM period counter for 
							periodic CPU interrupt requests and is automatically reset to 
							zero after each request is generated (when PERIOD_COUNT = 
							IRQ_RATE). Should be initialized to a start value of $FF.							
*******************************************************************************************/
void tpu_mcpwm_master_init(struct TPU3_tag *tpu, UINT8 channel, UINT8 priority, 
			UINT16 period, UINT8 irq_rate )
{
    /* disable channel so it can be configured safely */
    tpu_disable( tpu, channel);

    /* select MCPWM function */
    tpu_func( tpu, channel, TPU_FUNCTION_MCPWM);


    /* Initialize parameter RAM                                     */
    /* - initialize PERIOD & IRQ_RATE to their desired values 		*/
    /* - initialize PERIOD_COUNT to $FF 							*/

    tpu->PARM.R[channel][TPU_MASTER_PERIOD] = period;
    tpu->PARM.R[channel][TPU_MASTER_IRQRATE_PERIODCNT] = (INT16) (irq_rate << 8) | 0xFF;
    tpu->PARM.R[channel][TPU_MASTER_RISETIMEPTR] = (channel << 4) + 4;
    tpu->PARM.R[channel][TPU_MASTER_FALLTIMEPTR] = (channel << 4) + 6;

    /* Initialize channel */
    tpu_hsr(tpu, channel, TPU_MCPWM_INIT_MASTER);

    /* Enable channel by assigning a priority */
    tpu_enable(tpu, channel, priority);
}


/****************************************************************************************
FUNCTION      : tpu_mcpwm_slave_edgemode_init

PURPOSE       : To initialize a TPU channel to run the MCPWM function.

INPUTS NOTES  : This function has 7 parameters:

            *tpu          : This is a pointer to the TPU3 module to use. It is of type 
            				TPU3_tag which is defined in m_tpu3.h
            channel       : This is the TPU channel number of the MCPWM edge mode slave 
            				channel.  This parameter must be assigned a higher value than 
            				the channel number of the associated master channel.   
            priority      : This is the priority to assign to the channel.  This parameter 
            				should be assigned the same value as the priority of the associated 
            				master channel.
			period        : This defines the period of the PWM output in TCR1 clocks.
							period < $4000.  The PERIOD parameters of all slaves must
							have the same value as that of the master that they are 
							referencing.	 
			high_time 	  :	This is specified in TCR1 clocks over the range 0 to PERIOD, 
							representing 0 to 100% duty cycle.
		    high_time_ptr : This contains the TPU memory address of the value to be used for 
		    				the high time of the PWM output waveform.  Any TPU memory location 
		    				can be used, but in order to use the high time value specified by 
		    				the previous parameter, this pointer should be set to (channel * $10) 
		    				+ 2.  For example, if this slave is initialized to run on TPU channel 
		    				7, then high_time_ptr should be initialized to $72 in order to use the 
		    				high_time value specified above..  
			master_channel: This is the TPU channel number of the MCPWM master channel.					                          
*******************************************************************************************/
void tpu_mcpwm_slave_edgemode_init(struct TPU3_tag *tpu, UINT8 channel, UINT8 priority,   
                UINT16 period, UINT16 high_time, UINT8 high_time_ptr, UINT8 master_channel )
{    
    /* disable channel so it can be configured safely */
    tpu_disable( tpu, channel);

    /* select MCPWM function */
    tpu_func( tpu, channel, TPU_FUNCTION_MCPWM);


    /* Initialize parameter RAM												*/
    /* - initialize PERIOD, HIGH_TIME, HIGH_TIME_POINTER & MASTER_CHANNEL	*/
    /*	 to their desired values 											*/
   
    tpu->PARM.R[channel][TPU_SLAVE_PERIOD] = period;
    tpu->PARM.R[channel][TPU_SLAVE_HIGHTIME] = high_time;
    tpu->PARM.R[channel][TPU_SLAVE_HIGHTIME_PTR] = high_time_ptr;
    tpu->PARM.R[channel][TPU_SLAVE_RISETIME_PTR] = (master_channel << 4) + 4;
    tpu->PARM.R[channel][TPU_SLAVE_FALLTIME_PTR] = (master_channel << 4) + 6;
    
    /* Configure the channel measurement mode */
    tpu_hsq(tpu, channel, TPU_MCPWM_EDGE_ALLIGNED_MODE);

    /* Initialize channel */
    tpu_hsr(tpu, channel, TPU_MCPWM_All_OTHERSLAVES);

    /* Enable channel by assigning a priority */
    tpu_enable(tpu, channel, priority);
}


/****************************************************************************************
FUNCTION      : tpu_mcpwm_slavea_centermode_init

PURPOSE       : To initialize a TPU channel to run the MCPWM function.

INPUTS NOTES  : This function has 8 parameters:

            *tpu          : This is a pointer to the TPU3 module to use. It is of type 
            				TPU3_tag which is defined in m_tpu3.h
            channel       : This is the TPU channel number of the MCPWM slave A center-
            				aligned channel.  This parameter must be assigned a higher 
            				value than the channel number of the associated master channel.  
            				In CA mode, the slave A channel of a pair must be assigned a 
            				lower channel number than the slave B channel.   When two CA 
            				mode pairs are used to form an inverter driver (the second pair 
            				has dead time and references the CURRENT_HIGH_TIME parameter of 
            				the first pair), the pair without dead time must be assigned