tpu_oc.c

mpc564 时钟中断 时钟中断

                 			 reference value that is scaled by the RATIO parameter 
                 			 to form a new OFFSET value whenever a link is received.
                 ref_addr3 - A pointer into the parameter RAM map that points to a 
                 			 synchronization reference value used only once in 
                 			 continuous pulse mode when the first link service request 
                 			 is serviced after initialization.
                 mode - Mode is used to select which host service request mode to run:
                 		0 = All code is executed
                 		1 = Only code that updates the TCR values is executed.
                 force - This is what the OC will force the output to at initialization.
                 		Force High = 1
                 		Force Low = 2
                 		Don't Force = 3
                 change - This is what the OC will do to the output after the OFFSET time.
                 		Change High = 1
                 		Change Low = 2
                 		Toggle = 3
                 match_tcr - This selects which TCR value to match.
                 		TCR1 = 1
                 		TCR2 = 2
                 priority - This is the priority to assign to both channels.
                            This parameter should be assigned a value of:
                            TPU_PRIORITY_HIGH, TPU_PRIORITY_MIDDLE or
                            TPU_PRIORITY_LOW.
RETURNS NOTES : none
WARNING       : The channels must be stopped before it is reconfigured. The
                function disables the channels but if they were currently
                being serviced it would continue. The delay for assigning the
                pram pointer may to enough but depends on system loading.  This
                mode requires a link in order to be started.  The parameter offset
                must be less than 0x8001.
*******************************************************************************/
void tpu_oc_continuous(struct TPU3_tag *tpu, UINT8 channel, \
		UINT8 ratio, UINT8 ref_addr1, UINT8 ref_addr2, UINT8 ref_addr3, \
		UINT8 mode, UINT8 force, UINT8 change, UINT8 match_tcr, UINT8 priority )
{
    /* disable channel so it can be configured safely */
    tpu_disable( tpu, channel);
    
    /* select OC function for channel */
    tpu_func( tpu, channel, TPU_FUNCTION_OC);
    
    /* Initialize channel */
	tpu_hsr(tpu, channel, TPU_OC_CONTINUOUS);
    
    /* Initialize HSQ for code execution */
    if( mode != 0x0 )
		tpu_hsq(tpu, channel, TPU_OC_TCR_ONLY);    
	else
		tpu_hsq(tpu, channel, TPU_OC_ALL_CODE);    
	
    tpu->PARM.R[channel][TPU_OC_CHANNEL_CONTROL] = 0x80 + 0x20 * match_tcr + change + force ;
    tpu->PARM.R[channel][TPU_OC_PARAM2] = ratio * 0x100 + ref_addr1 ;
    tpu->PARM.R[channel][TPU_OC_PARAM3] = ref_addr2 * 0x100 + ref_addr3 ;

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


/*******************************************************************************
FUNCTION      : tpu_oc_continuous_update
PURPOSE       : To initialize a channel to run the OC function in continuous 
				mode to update the 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 channel number of the primary QDEC
                           channel.
                 ratio - An 8-bit fractional parameter (0.xxxxxxxx) that scales
                 		 the contents indicated by REF_ADDR2 in the calculation 
                 		 of the OFFSET parameter when operating in the continuous
                 		 pulse mode. The actual fraction used by the TPU is 
                 		 RATIO/$FF. Thus, a value of $80 in RATIO represents the 
                 		 fraction $80/$FF, which is approximately equal to 1/2.  
                 		 Similarly, a value of $FF in RATIO represents a ratio of 1/1.
                 ref_addr1 - This is the low byte of the address where a reference 
                 			 time resides, or the address of the current TCR value.
                 ref_addr2 - A pointer into the parameter RAM map.  It points to a 
                 			 reference value that is scaled by the RATIO parameter 
                 			 to form a new OFFSET value whenever a link is received.
                 mode - Mode is used to select which host service request mode to run:
                 		0 = All code is executed
                 		1 = Only code that updates the TCR values is executed.
                 force - This is what the OC will force the output to at initialization.
                 		Force High = 1
                 		Force Low = 2
                 		Don't Force = 3
                 change - This is what the OC will do to the output after the OFFSET time.
                 		Change High = 1
                 		Change Low = 2
                 		Toggle = 3
RETURNS NOTES : none
WARNING       : none
*******************************************************************************/
void tpu_oc_continuous_update(struct TPU3_tag *tpu, UINT8 channel, UINT8 ratio, \
		UINT8 ref_addr1, UINT8 ref_addr2, UINT8 force, UINT8 change, UINT8 match_tcr ) 
{
    tpu->PARM.R[channel][TPU_OC_CHANNEL_CONTROL] = 0x80 + 0x20 * match_tcr + change + force ;
    tpu->PARM.R[channel][TPU_OC_PARAM2] = ratio * 0x100 + ref_addr1 ;
    tpu->PARM.R[channel][TPU_OC_PARAM3] = ref_addr2 * 0x100 ;
}


/*******************************************************************************
FUNCTION      : tpu_oc_read_ref_time
PURPOSE       : To read the reference time of the TCR value when the next match
				event will occur, or the TCR value of the most recent match event.
INPUTS NOTES  : This function has 2 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 channel number of the primary QDEC
                           channel.
RETURNS NOTES : Function returns the reference time of the Output Compare function.
WARNING       : None
*******************************************************************************/
UINT16 tpu_oc_read_ref_time(struct TPU3_tag *tpu, UINT8 channel )
{	
    return(tpu->PARM.R[channel][TPU_OC_REF_TIME]);
}


/*******************************************************************************
FUNCTION      : tpu_oc_read_actual_match_time
PURPOSE       : ACTUAL_MATCH_TIME contains the TCR value captured at the time 
				of the last match event. This may be used by the host CPU to 
				estimate time available before the next match and to confirm 
				that a change in offset was effected as desired. The TBS field
				determines which TCR is captured and placed in this parameter. 
INPUTS NOTES  : This function has 2 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 channel number of the primary QDEC
                           channel.
RETURNS NOTES : Function returns the actual match time of the function.
WARNING       : This parameter is used only in the host-initiated pulse mode.
*******************************************************************************/
UINT16 tpu_oc_read_actual_match_time(struct TPU3_tag *tpu, UINT8 channel )
{	
    return(tpu->PARM.R[channel][TPU_OC_MATCH_TIME]);
}

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