Part Number: TMDSSOLARUINVKIT
Other Parts Discussed in Thread: AFE031
Hi,
Is it possible to get an 85KHz sine wave output with the C2000 Piccolo F28035 MCU (60MHz) that comes with this inverter kit? I'm using the GEN_SIN_COS.asm module. I've got it up to around 50kHz to 60kHz and can't seem to get higher.
-SYSTEM CLOCK is set to 60MHz 'PLLset(0xC);'
-running open loop
-switching frequency: 50 cycles per PWM period or 1.2MHz
-control loop period: 100 cycles (can maybe go a little less but at 50 cycles the output is no longer a sinusoidal)
-dwPll_Trace_Freq/GEN_SIN_COS_Ws: is set to 2^31-1
-dwPll_Sample_Time/GEN_SIN_COS_Ts: is set to 2^16 or so, initially increasing this increased the output frequency but above 2^16 it stopped having an effect
Here is the assembly for the module.
;---------------------------------------------------------------------------------- ; FILE: GEN_SIN_COS.asm ; ; Description: Generate the sine and cos wave for PLL and inverter trace angle ; ; Version: 2.0 ; ; Target: F2802x / F2803x ; ;-------------------------------------------------------------------------------- ; Copyright Texas Instruments 2010 ;-------------------------------------------------------------------------------- ; Revision History: ;-------------------------------------------------------------------------------- ; Date | Description ;-------------------------------------------------------------------------------- ; 06/15/10 | Release 2.0 New release. ;-------------------------------------------------------------------------------- ;============================= GEN_SIN_COS_INT .macro n ;============================= ; allocate memory space for data & terminal pointers _GEN_SIN_COS_Sin_0 .usect "GEN_Sin_Cos_Section",2,1,1 ;Q22 _GEN_SIN_COS_Sin_1 .usect "GEN_Sin_Cos_Section",2,1,1 _GEN_SIN_COS_Cos_0 .usect "GEN_Sin_Cos_Section",2,1,1 _GEN_SIN_COS_Cos_1 .usect "GEN_Sin_Cos_Section",2,1,1 _GEN_SIN_COS_Max .usect "GEN_Sin_Cos_Section",2,1,1 _GEN_SIN_COS_Min .usect "GEN_Sin_Cos_Section",2,1,1 _GEN_SIN_COS_Ws .usect "GEN_Sin_Cos_Section",2,1,1 ;Q20 _GEN_SIN_COS_Ts .usect "GEN_Sin_Cos_Section",2,1,1 ;Q24 _dwSin_Cos_Temp .usect "GEN_Sin_Cos_Section",2,1,1 ;Publish Terminal Pointers for access from the C environment .def _GEN_SIN_COS_Sin_0 .def _GEN_SIN_COS_Sin_1 .def _GEN_SIN_COS_Cos_0 .def _GEN_SIN_COS_Cos_1 .def _GEN_SIN_COS_Max .def _GEN_SIN_COS_Min .def _GEN_SIN_COS_Ws .def _GEN_SIN_COS_Ts ; set terminal pointer to ZeroNet MOVL XAR2, #ZeroNet MOVW DP, #_GEN_SIN_COS_Sin_0 MOVL @_GEN_SIN_COS_Sin_0, XAR2 MOVL @_GEN_SIN_COS_Sin_1, XAR2 MOVL @_GEN_SIN_COS_Cos_0, XAR2 MOVL @_GEN_SIN_COS_Cos_1, XAR2 MOVL @_GEN_SIN_COS_Max, XAR2 MOVL @_GEN_SIN_COS_Min, XAR2 MOVL @_GEN_SIN_COS_Ws, XAR2 MOVL @_GEN_SIN_COS_Ts, XAR2 .endm ;------------------------------------------------------------------------------------------- ;============================= GEN_SIN_COS .macro n ;============================= MOVW DP, #_GEN_SIN_COS_Sin_0 ;load DP pointer with page value containing _GEN_SIN_COS_SIN_0 MOVL XAR0,@_GEN_SIN_COS_Ws ;load XAR0 with pointer to _GEN_SIN_COS_Ws (Q20) MOVL XAR1,@_GEN_SIN_COS_Ts ;load XAR1 with pointer to _GEN_SIN_COS_Ts (Q24) MOVL XAR2,@_GEN_SIN_COS_Sin_0 ;load XAR2 with pointer to _GEN_SIN_COS_Sin_0 (Q22) MOVL XAR3,@_GEN_SIN_COS_Cos_0 ;load XAR3 with pointer to _GEN_SIN_COS_Cos_0 (Q22) MOVL XT,*XAR0 ;load XT with location pointed to by XAR0 IMPYL P,XT,*XAR1 ;signed 32x32bit multiply, P is product (the signed lower 32 bits) QMPYL ACC,XT,*XAR1 ;upper 32 bits LSL64 ACC:P,#8 ;logical left shift 8bits? (ACC = Ws*Ts , ACC->Q20) MOVL @_dwSin_Cos_Temp,ACC ;Temp = Ws*Ts MOVL @XT,ACC ;XT = Ws*Ts IMPYL P,XT,*XAR2 ;P = Ws*Ts*Sin_0[31:0] QMPYL ACC,XT,*XAR2 ;ACC = Ws*Ts*Sin_0[63:32] LSL64 ACC:P,#12 ; ACC->Q22 NEG ACC ; ACC = -ACC MOVL XAR0,@_GEN_SIN_COS_Min MOVL XAR1,@_GEN_SIN_COS_Max MOVL XAR2,@_GEN_SIN_COS_Cos_1 ADDL ACC,*XAR2 ; ACC = Cos_1 - Ws*Ts*Sin_0 MINL ACC,*XAR1 ; Saturation high MAXL ACC,*XAR0 ; Saturation low MOVL *XAR2,ACC ; Cos_1 = Cos_1 - Ws*Ts*Sin_0 MOVL XT,@_dwSin_Cos_Temp ; XT = Ws*Ts IMPYL P,XT,*XAR3 ;P = Ws*Ts*Cos_0[31:0] QMPYL ACC,XT,*XAR3 ;ACC = Ws*Ts*Cos_0[63:32] LSL64 ACC:P,#12 ; ACC->Q22 MOVL XAR3,@_GEN_SIN_COS_Sin_1 ADDL ACC,*XAR3 ; ACC = Sin_1 + Ws*Ts*Cos_0 MINL ACC,*XAR1 ; Saturation hig MAXL ACC,*XAR0 ; Saturation low MOVL *XAR3,ACC ; Sin_1 = Sin_1 + Ws*Ts*Cos_0 ;;Save the Sin_0, Cos_0 for the next step MOVL XAR0,@_GEN_SIN_COS_Sin_0 MOVL XAR1,@_GEN_SIN_COS_Cos_0 MOVL *XAR0,ACC MOVL ACC,*XAR2 MOVL *XAR1,ACC .endm ; end of file
Thanks,
Milo
