;=====================================================================================================================
; File name:       F2407BLDCPWM2.ASM                     
;                    
; Originator:	Digital Control Systems Group
;			Texas Instruments
; Description:                                   
; This file contains source for the Full Compare PWM  drivers for the F2407   
; Applicability of these functions is indicated in the Table 1               
;=====================================================================================
; History:
;-------------------------------------------------------------------------------------
; 9-15-2000	Release	Rev 1.0
;================================================================================
;                           T A B L E      1                                 
;================================================================================
;     Function Name    |    Applicability                                    
;================================================================================
;                      |      F240 | F241| F243 | LF2402 | LF2406 | LF2407   
;                      |           |     |      |        |        |          
; F2407_BLDC_PWM_Update|           |     |      |   Y    |   Y    |    Y      
;================================================================================
;================================================================================
;  Routine Name: PWM Update Routine        Routine Type: C Callable
;
;  Description:
;  
;  C prototype : int F2407_BLDC_PWM_Update(PWMGEN *p)
;================================================================================
; History:  Created  August 22, 2000        
;
; Definition of the argument structure.
; typedef struct {
;  int cmtn_ptr_bd;
;  int mfunc_p ;
;  int period_max;
;  int d_func ;  
;  int (*init)();            
;  int (*update)();          
; } PWMGEN;
;
;================================================================================   
    
   .include ..\include\x240x.h


POINT_EV	.macro
		LDP	#0E8h
		.endm

ACTIVE_HI  .set     1           ;Select ACTIVE_HI or ACTIVE_LO by setting
ACTIVE_LO  .set     0           ;the corresponding parameter to 1. Set the other
                                ;parameter to 0.            

;This setting depends on Power devices. ACTIVE_HI implies the power device turns
;ON with a HIGH gate signal. ACTIVE_LO implies the power device turns
;ON with a LOW gate signal. This polarity definition is not the same as the PWM
;polarity(Active High/Active Low) defined by the ACTR 
;register in x24x/x24xx. The setting chosen here is applicable only when ACTR
;is configured to generate Active High PWM. 


MAXPERIOD  .set     7fffh
                             
;================================================================================                 

;       Frame Usage Details:
;            |      a           
;____________|______________________________________
;       FR0  |                                      |
;       FR1  |  (1) temp_var1,   (2) period         | 
;       FR2  |  temp_var2                           |                            
;================================================================================                    

                .def    _F2407_BLDC_PWM_Update  
;================================================================================                       

_F2407_BLDC_PWM_Update:
;--------------------------------------------------------------------------

__F2407_BLDC_PWM_Update_framesize .set 0003h    
;================================================================================  
                                ; ARP=AR1
                                ; AR1 is  stack pointer (SP)
                                ; AR0 is frame pointer (FP)
                              
        POPD *+                 ; Save the return address from hardware
                                ; stack into the software stack
                                ; ARP = AR1
    
        
        SAR   AR0,*+            ; Push AR0(FP).ARP = AR1
        
        SAR   AR1,*             ; *SP = SP.ARP = AR1.  
        
        LAR   AR0, #__F2407_BLDC_PWM_Update_framesize
                                ; AR0 = size of frame. ARP = AR1 

        LAR   AR0,*0+,AR2 
                                ; Allocate frame. ARP = AR2.
                                ; AR0 = AR1 + AR0.  
                                ; AR1 is the Stack Pointer (SP)
                                ; AR0 is the Frame Pointer (FP)   
;================================================================================  
                LAR     AR2,#-3 ; AR2 = -3.
                                ; ARP = AR2.
;-------------------------------------------------------------------------------     
                MAR     *0+     ; AR2 = AR0 - 3. AR2 ->  passed parameter
                                ;(i.e. pointer to  PWMGEN structure).
                                ; ARP = AR2.
;--------------------------------------------------------------------------------        
                LAR     AR3,*,AR3
                                ; AR3 points to the first structure member.
                                ; (i.e. AR3 -> cmtn_ptr_bd). 
                                ; ARP = AR3.
;--------------------------------------------------------------------------
                LACC    #_COMMUTATION_TBL
                                ; Accumulator = COMMUTATION_TBL.
                                ; ARP = AR3.  AR3 -> cmtn_ptr_bd.
;--------------------------------------------------------------------------
                ADD     *+,AR2  ; Accumulator = Accumulator + cmtn_ptr_bd.
                                ; AR3 -> mfunc_p.
                                ; ARP = AR2.
;--------------------------------------------------------------------------                                
                LAR     AR2,#1  ; AR2 = 1.
                                ; AR3 -> mfunc_p.
                                ; ARP = AR2.
;--------------------------------------------------------------------------                                
                MAR     *0+     ; AR2 = AR0 + 1.
                                ; AR2-> FR1(i.e. temp_var1).
                                ; AR3 -> mfunc_p. 
                                ; ARP = AR2
;--------------------------------------------------------------------------
                TBLR    *       ; Load program address in data memory.
                                ; ARP = AR2. 
                                ; AR2-> FR1(i.e. temp_var1).
                                ; AR3 -> mfunc_p.
;--------------------------------------------------------------------------
                LACC    *,AR3   ; Load state address in accumulator.
                                ; ARP = AR3. AR3 -> mfunc_p.
                                ; AR2-> FR1(scope of temp_var1 is over).
;--------------------------------------------------------------------------
                BACC            ; Branch to the state specified 
                                ; by accimulator.
                                ; ARP = AR3. AR3 -> mfunc_p.
                                ; AR2-> FR1.
;================================================================================                       
__PWM_state_anb:                ; Input current path     Phase A
                POINT_EV        ; Output Current Path    Phase B
                
                SPLK    #00C2h,ACTRA