Operational Description of HRPWM
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SPRUI07–March 2020
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High-Resolution Pulse Width Modulator (HRPWM)
Example 4-7 shows an assembly example of run-time code for the HRPWM buck converter.
Example 4-7. HRPWM Buck Converter Run-Time Code
EPWM1_BASE .set 0x6800
CMPAHR1 .set EPWM1_BASE+0x8
;===============================================
HRBUCK_DRV; (can execute within an ISR or loop)
;===============================================
MOVW DP, #_HRBUCK_In
MOVL XAR2,@_HRBUCK_In ; Pointer to Input Q15 Duty (XAR2)
MOVL XAR3,#CMPAHR1 ; Pointer to HRPWM CMPA reg (XAR3)
; Output for EPWM1A (HRPWM)
MOV T,*XAR2 ; T <= Duty
MPYU ACC,T,@_hrbuck_period ; Q15 to Q0 scaling based on Period
MOV T,@_MEP_ScaleFactor ; MEP scale factor (from optimizer s/w)
MPYU P,T,@AL ; P <= T * AL, Optimizer scaling
MOVH @AL,P ; AL <= P, move result back to ACC
ADD ACC, #0x180 ; MEP range and rounding adjustment
MOVL *XAR3,ACC ; CMPA:CMPAHR(31:8) <= ACC
; Output for EPWM1B (Regular Res) Optional - for comparison purpose only
MOV *+XAR3[2],AH ; Store ACCH to regular CMPB
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