v_loop_asm.s

; **********************************************************************************
;  SDK Version: PowerSmart™ Digital Control Library Designer v0.9.12.672
;  CGS Version: Code Generator Script v3.0.7 (03/07/2021)
;  Author:      M91406
;  Date/Time:   03/08/2021 12:42:58
; **********************************************************************************
;  4P4Z Control Library File (Fast Floating Point Coefficient Scaling Mode)
; **********************************************************************************
    
;------------------------------------------------------------------------------
;file start
    .nolist                                 ; (no external dependencies)
    .list                                   ; list of all external dependencies
    
;------------------------------------------------------------------------------
;local inclusions.
    .section .data                          ; place constant data in the data section
    
;------------------------------------------------------------------------------
;include NPNZ16b_s data structure and global constants.
    .include "./sources/power_control/drivers/npnz16b.inc" ; include NPNZ16b_s object data structure value offsets and status flag labels
    
;------------------------------------------------------------------------------
;source code section.
    .section .text                          ; place code in the text section
    
;------------------------------------------------------------------------------
; Global function declaration
; This function calls the z-domain controller processing the latest data point input
;------------------------------------------------------------------------------
 
    .global _v_loop_Update                  ; provide global scope to routine
    _v_loop_Update:                         ; local function label
    
;------------------------------------------------------------------------------
; Check status word for Enable/Disable flag and bypass computation, if disabled
    btss [w0], #NPNZ16_STATUS_ENABLED       ; check ENABLED bit state, skip (do not execute) next instruction if set
    bra V_LOOP_LOOP_BYPASS                  ; if ENABLED bit is cleared, jump to end of control code
    
;------------------------------------------------------------------------------
; Setup pointer to first element of error history array
    mov [w0 + #ptrErrorHistory], w10        ; load pointer address into working register
    
;------------------------------------------------------------------------------
; Update error history (move error one tick down the delay line)
    mov [w10 + #6], w6                      ; move entry (n-4) into buffer
    mov w6, [w10 + #8]                      ; move buffered value one tick down the delay line
    mov [w10 + #4], w6                      ; move entry (n-3) into buffer
    mov w6, [w10 + #6]                      ; move buffered value one tick down the delay line
    mov [w10 + #2], w6                      ; move entry (n-2) into buffer
    mov w6, [w10 + #4]                      ; move buffered value one tick down the delay line
    mov [w10 + #0], w6                      ; move entry (n-1) into buffer
    mov w6, [w10 + #2]                      ; move buffered value one tick down the delay line
    
;------------------------------------------------------------------------------
; Read data from input source
    mov [w0 + #ptrSourceRegister], w2       ; load pointer to input source register
    mov [w2], w1                            ; move value from input source into working register
    mov [w0 + #ptrDProvControlInputComp], w2 ; load pointer address of target buffer of most recent, compensated controller input from data structure
    mov w1, [w2]                            ; copy most recent controller input value to given data buffer target
    
;------------------------------------------------------------------------------
; Load reference and calculate error input to transfer function
    mov [w0 + #ptrControlReference], w2     ; move pointer to control reference into working register
    subr w1, [w2], w1                       ; calculate error (=reference - input)
    mov [w0 + #normPreShift], w2            ; move error input scaler into working register
    sl w1, w2, w1                           ; normalize error result to fractional number format
    
;------------------------------------------------------------------------------
; Setup pointers to B-Term data arrays
    mov [w0 + #ptrBCoefficients], w8        ; load pointer to first index of B coefficients array
    mov w1, [w10]                           ; add most recent error input to history array
    
;------------------------------------------------------------------------------
; Compute compensation filter B-term
    clr b, [w8]+=2, w5                      ; clear accumulator B and prefetch first error operand
    clr a, [w8]+=4, w4, [w10]+=2, w6        ; clear accumulator A and prefetch first coefficient operand including number scaler
    mpy w4*w6, a, [w8]+=4, w4, [w10]+=2, w6 ; multiply first control output of the delay line with first coefficient
    sftac a, w5                             ; shift accumulator to post-scale floating number
    add b                                   ; add accumulator a to accumulator b
    mov [w8 - #6], w5                       ; load scaler into working register
    mpy w4*w6, a, [w8]+=4, w4, [w10]+=2, w6 ; multiply control output (n-1) from the delay line with coefficient B1
    sftac a, w5                             ; shift accumulator to post-scale floating number
    add b                                   ; add accumulator a to accumulator b
    mov [w8 - #6], w5                       ; load scaler into working register
    mpy w4*w6, a, [w8]+=4, w4, [w10]+=2, w6 ; multiply control output (n-2) from the delay line with coefficient B2
    sftac a, w5                             ; shift accumulator to post-scale floating number
    add b                                   ; add accumulator a to accumulator b
    mov [w8 - #6], w5                       ; load scaler into working register
    mpy w4*w6, a, [w8]+=4, w4, [w10]+=2, w6 ; multiply control output (n-3) from the delay line with coefficient B3
    sftac a, w5                             ; shift accumulator to post-scale floating number
    add b                                   ; add accumulator a to accumulator b
    mov [w8 - #6], w5                       ; load scaler into working register
    mpy w4*w6, a                            ; multiply & accumulate last control output with coefficient of the delay line (no more prefetch)
    sftac a, w5                             ; shift accumulator to post-scale floating number
    add b                                   ; add accumulator a to accumulator b
    
;------------------------------------------------------------------------------
; Setup pointers to A-Term data arrays
    mov [w0 + #ptrACoefficients], w8        ; load pointer to first index of A coefficients array
    
;------------------------------------------------------------------------------
; Load pointer to first element of control history array
    mov [w0 + #ptrControlHistory], w10      ; load pointer address into working register
    
;------------------------------------------------------------------------------
; Compute compensation filter A-term
    movsac b, [w8]+=2, w5                   ; leave contents of accumulator B unchanged
    clr a, [w8]+=4, w4, [w10]+=2, w6        ; clear accumulator A and prefetch first coefficient operand including number scaler
    mpy w4*w6, a, [w8]+=4, w4, [w10]+=2, w6 ; multiply first control output of the delay line with first coefficient
    sftac a, w5                             ; shift accumulator to post-scale floating number
    add b                                   ; add accumulator a to accumulator b
    mov [w8 - #6], w5                       ; load scaler into working register
    mpy w4*w6, a, [w8]+=4, w4, [w10]+=2, w6 ; multiply control output (n-2) from the delay line with coefficient A2
    sftac a, w5                             ; shift accumulator to post-scale floating number
    add b                                   ; add accumulator a to accumulator b
    mov [w8 - #6], w5                       ; load scaler into working register
    mpy w4*w6, a, [w8]+=4, w4, [w10]+=2, w6 ; multiply control output (n-3) from the delay line with coefficient A3
    sftac a, w5                             ; shift accumulator to post-scale floating number
    add b                                   ; add accumulator a to accumulator b
    mov [w8 - #6], w5                       ; load scaler into working register
    mpy w4*w6, a                            ; multiply & accumulate last control output with coefficient of the delay line (no more prefetch)
    sftac a, w5                             ; shift accumulator to post-scale floating number
    add b                                   ; add accumulator a to accumulator b
    sac.r b, w4                             ; store most recent accumulator result in working register
    
;------------------------------------------------------------------------------
; Controller Anti-Windup (control output value clamping)
     
; Check for lower limit violation
    mov [w0 + #MinOutput], w6               ; load lower limit value
    cpsgt w4, w6                            ; compare values and skip next instruction if control output is within operating range (control output > lower limit)
    mov w6, w4                              ; override controller output
    V_LOOP_CLAMP_MIN_EXIT:
     
; Check for upper limit violation
    mov [w0 + #MaxOutput], w6               ; load upper limit value
    cpslt w4, w6                            ; compare values and skip next instruction if control output is within operating range (control output < upper limit)
    mov w6, w4                              ; override controller output
    V_LOOP_CLAMP_MAX_EXIT:
    
;------------------------------------------------------------------------------
; Write control output value to target
    mov [w0 + #ptrTargetRegister], w8       ; capture pointer to target in working register
    mov w4, [w8]                            ; move control output to target address
    mov [w0 + #ptrDProvControlOutput], w2   ; load pointer address of target buffer of most recent controller output value from data structure
    mov w4, [w2]                            ; copy most recent controller output value to given data buffer target
    
;------------------------------------------------------------------------------
; Update ADC trigger locations
    asr w4, #1, w6                          ; half control output by shifting value one bit to the right
    ; Update ADC trigger B position
    mov [w0 + #ADCTriggerBOffset], w8       ; load user-defined ADC trigger B offset value into working register
    add w6, w8, w10                         ; add user-defined ADC trigger B offset to half of control output
    mov [w0 + #ptrADCTriggerBRegister], w8  ; load pointer to ADC trigger B register into working register
    mov w10, [w8]                           ; push new ADC trigger value to ADC trigger B register
    ; Update ADC trigger A position
    mov [w0 + #ADCTriggerAOffset], w8       ; load user-defined ADC trigger A offset value into working register
    add w6, w8, w10                         ; add user-defined ADC trigger A offset to half of control output
    mov [w0 + #ptrADCTriggerARegister], w8  ; load pointer to ADC trigger A register into working register
    mov w10, [w8]                           ; push new ADC trigger value to ADC trigger A register
    
;------------------------------------------------------------------------------
; Load pointer to first element of control history array
    mov [w0 + #ptrControlHistory], w10      ; load pointer address into working register
    
;------------------------------------------------------------------------------
; Update control output history (move entries one tick down the delay line)
    mov [w10 + #4], w6                      ; move entry (n-3) one tick down the delay line
    mov w6, [w10 + #6]
    mov [w10 + #2], w6                      ; move entry (n-2) one tick down the delay line
    mov w6, [w10 + #4]
    mov [w10 + #0], w6                      ; move entry (n-1) one tick down the delay line
    mov w6, [w10 + #2]
    mov w4, [w10]                           ; add most recent control output to history
    
;------------------------------------------------------------------------------
; Enable/Disable bypass branch target with dummy read of source buffer
    goto V_LOOP_LOOP_EXIT                   ; when enabled, step over dummy read and go straight to EXIT
    V_LOOP_LOOP_BYPASS:                     ; Enable/Disable bypass branch target to perform dummy read of source to clear the source buffer
    mov [w0 + #ptrSourceRegister], w2       ; load pointer to input source register
    mov [w2], w1                            ; move value from input source into working register
    mov [w0 + #ptrDProvControlInputComp], w2 ; load pointer address of target buffer of most recent, compensated controller input from data structure
    mov w1, [w2]                            ; copy most recent controller input value to given data buffer target
    mov [w0 + #ptrDProvControlOutput], w2   ; load pointer address of target buffer of most recent controller output value from data structure
    clr [w2]                                ; copy most recent controller output value to given data buffer target
    V_LOOP_LOOP_EXIT:                       ; Exit control loop branch target
    
;------------------------------------------------------------------------------
; End of routine
    return                                  ; end of function; return to caller
    
;------------------------------------------------------------------------------
 
    
;------------------------------------------------------------------------------
; Global function declaration v_loop_Reset
; This function clears control and error histories enforcing a reset
;------------------------------------------------------------------------------
 
    .global _v_loop_Reset                   ; provide global scope to routine
    _v_loop_Reset:                          ; local function label
    
;------------------------------------------------------------------------------
; Clear control history array
    push w0                                 ; save contents of working register WREG0
    mov [w0 + #ptrControlHistory], w0       ; set pointer to the base address of control history array
    clr [w0++]                              ; clear next address of control history array
    clr [w0++]                              ; clear next address of control history array
    clr [w0++]                              ; clear next address of control history array
    clr [w0]                                ; clear last address of control history array
    pop w0                                  ; restore contents of working register WREG0
    
;------------------------------------------------------------------------------
; Clear error history array
    push w0                                 ; save contents of working register WREG0
    mov [w0 + #ptrErrorHistory], w0         ; set pointer to the base address of error history array
    clr [w0++]                              ; Clear next address of error history array
    clr [w0++]                              ; Clear next address of error history array
    clr [w0++]                              ; Clear next address of error history array
    clr [w0++]                              ; Clear next address of error history array
    clr [w0]                                ; clear last address of error history array
    pop w0                                  ; restore contents of working register WREG0
    
;------------------------------------------------------------------------------
; End of routine
    return                                  ; end of function; return to caller
    
;------------------------------------------------------------------------------
 
    
;------------------------------------------------------------------------------
; Global function declaration v_loop_Precharge
; This function loads user-defined default values into control and error histories
;------------------------------------------------------------------------------
 
    .global _v_loop_Precharge               ; provide global scope to routine
    _v_loop_Precharge:                      ; local function label
    
;------------------------------------------------------------------------------
; Charge error history array with defined value
    push w0                                 ; save contents of working register WREG0
    push w1                                 ; save contents of working register WREG1
    mov  [w0 + #ptrErrorHistory], w0        ; set pointer to the base address of error history array
    mov w1, [w0++]                          ; Load user value into next address of error history array
    mov w1, [w0++]                          ; Load user value into next address of error history array
    mov w1, [w0++]                          ; Load user value into next address of error history array
    mov w1, [w0++]                          ; Load user value into next address of error history array
    mov w1, [w0]                            ; load user value into last address of error history array
    pop w1                                  ; restore contents of working register WREG1
    pop w0                                  ; restore contents of working register WREG0
    
;------------------------------------------------------------------------------
; Charge control history array with defined value
    push w0                                 ; save contents of working register WREG0
    push w2                                 ; save contents of working register WREG2
    mov  [w0 + #ptrControlHistory], w0      ; set pointer to the base address of control history array
    mov w2, [w0++]                          ; Load user value into next address of control history array
    mov w2, [w0++]                          ; Load user value into next address of control history array
    mov w2, [w0++]                          ; Load user value into next address of control history array
    mov w2, [w0]                            ; Load user value into last address of control history array
    pop w2                                  ; restore contents of working register WREG2
    pop w0                                  ; restore contents of working register WREG0
    
;------------------------------------------------------------------------------
; End of routine
    return                                  ; end of function; return to caller
    
;------------------------------------------------------------------------------
 
    
;------------------------------------------------------------------------------
; Global function declaration v_loop_PTermUpdate
; This function executes a P-Term based control loop used for plant measurements only.
; THIS LOOP IS NOT SUITED FOR STABLE OPERATION
;------------------------------------------------------------------------------
 
    .global _v_loop_PTermUpdate             ; provide global scope to routine
    _v_loop_PTermUpdate:                    ; local function label
    
;------------------------------------------------------------------------------
; Check status word for Enable/Disable flag and bypass computation when disabled
    btss [w0], #NPNZ16_STATUS_ENABLED       ; check ENABLED bit state, skip (do not execute) next instruction if set
    bra V_LOOP_PTERM_LOOP_BYPASS            ; if ENABLED bit is cleared, jump to end of control code
    
;------------------------------------------------------------------------------
; Read data from input source
    mov [w0 + #ptrSourceRegister], w2       ; load pointer to input source register
    mov [w2], w1                            ; move value from input source into working register
    mov [w0 + #ptrDProvControlInputComp], w2 ; load pointer address of target buffer of most recent, compensated controller input from data structure
    mov w1, [w2]                            ; copy most recent controller input value to given data buffer target
    
;------------------------------------------------------------------------------
; Load reference and calculate error input to transfer function
    mov [w0 + #ptrControlReference], w2     ; move pointer to control reference into working register
    subr w1, [w2], w1                       ; calculate error (=reference - input)
    mov [w0 + #normPreShift], w2            ; move error input scaler into working register
    sl w1, w2, w1                           ; normalize error result to fractional number format
    
;------------------------------------------------------------------------------
; Load P-gain factor from data structure
    mov [w0 + #PTermFactor], w6             ; move P-coefficient fractional into working register
    mov [w0 + #PTermScaler], w2             ; move P-coefficient scaler into working register
    mov w1, w4                              ; move error to MPY working register
    ; calculate P-control result
    mpy w4*w6, a                            ; multiply most recent error with P-coefficient
    sftac a, w2                             ; shift accumulator to post-scale floating number
    sac.r a, w4                             ; store accumulator result to working register
    
;------------------------------------------------------------------------------
; Controller Anti-Windup (control output value clamping)
     
; Check for lower limit violation
    mov [w0 + #MinOutput], w6               ; load lower limit value
    cpsgt w4, w6                            ; compare values and skip next instruction if control output is within operating range (control output > lower limit)
    mov w6, w4                              ; override controller output
    V_LOOP_PTERM_CLAMP_MIN_EXIT:
     
; Check for upper limit violation
    mov [w0 + #MaxOutput], w6               ; load upper limit value
    cpslt w4, w6                            ; compare values and skip next instruction if control output is within operating range (control output < upper limit)
    mov w6, w4                              ; override controller output
    V_LOOP_PTERM_CLAMP_MAX_EXIT:
    
;------------------------------------------------------------------------------
; Write control output value to target
    mov [w0 + #ptrTargetRegister], w8       ; capture pointer to target in working register
    mov w4, [w8]                            ; move control output to target address
    mov [w0 + #ptrDProvControlOutput], w2   ; load pointer address of target buffer of most recent controller output value from data structure
    mov w4, [w2]                            ; copy most recent controller output value to given data buffer target
    
;------------------------------------------------------------------------------
; Update ADC trigger locations
    asr w4, #1, w6                          ; half control output by shifting value one bit to the right
    ; Update ADC trigger B position
    mov [w0 + #ADCTriggerBOffset], w8       ; load user-defined ADC trigger B offset value into working register
    add w6, w8, w10                         ; add user-defined ADC trigger B offset to half of control output
    mov [w0 + #ptrADCTriggerBRegister], w8  ; load pointer to ADC trigger B register into working register
    mov w10, [w8]                           ; push new ADC trigger value to ADC trigger B register
    ; Update ADC trigger A position
    mov [w0 + #ADCTriggerAOffset], w8       ; load user-defined ADC trigger A offset value into working register
    add w6, w8, w10                         ; add user-defined ADC trigger A offset to half of control output
    mov [w0 + #ptrADCTriggerARegister], w8  ; load pointer to ADC trigger A register into working register
    mov w10, [w8]                           ; push new ADC trigger value to ADC trigger A register
    
;------------------------------------------------------------------------------
; Enable/Disable bypass branch target with dummy read of source buffer
    goto V_LOOP_PTERM_LOOP_EXIT             ; when enabled, step over dummy read and go straight to EXIT
    V_LOOP_PTERM_LOOP_BYPASS:               ; Enable/Disable bypass branch target to perform dummy read of source to clear the source buffer
    mov [w0 + #ptrSourceRegister], w2       ; load pointer to input source register
    mov [w2], w1                            ; move value from input source into working register
    mov [w0 + #ptrDProvControlInputComp], w2 ; load pointer address of target buffer of most recent, compensated controller input from data structure
    mov w1, [w2]                            ; copy most recent controller input value to given data buffer target
    mov [w0 + #ptrDProvControlOutput], w2   ; load pointer address of target buffer of most recent controller output value from data structure
    clr [w2]                                ; copy most recent controller output value to given data buffer target
    V_LOOP_PTERM_LOOP_EXIT:                 ; Exit P-Term control loop branch target
    
;------------------------------------------------------------------------------
; End of routine
    return                                  ; end of function; return to caller
    
;------------------------------------------------------------------------------
 
    
;------------------------------------------------------------------------------
; End of file
    .end                                    ; end of file v_loop_asm.s
    
;------------------------------------------------------------------------------
 
     
; **********************************************************************************
;  Download latest version of this tool here: https://areiter128.github.io/DCLD
; **********************************************************************************