你好.....
可以請你幫我看ㄧ下這個程式哪裡需要修改才能達到60Hz嗎?
因為我不太懂他的振幅要在哪邊調整......
麻煩高手幫忙一下.....

#define __dsPIC30F2010__

#include <uart.h>
#include <adc12.h>
#include <timer.h>
#include <math.h>
#include <p30F2010.h>
#include <uart.h>
#include <stdio.h>
//#include "APP009V2_LCD.h"

#define pi 3.1415926
#define FCY 7372800 * 2

#define MAX_HALF_DUTY 730 // Max Duty is 180 , but multiplex with 100

#define Volt0 736

void Initial_Timer1( void ) ;
void Initial_CAN( void ) ;
void DelayNmSec(unsigned int ) ;
void InitADC10(void);
void MotPWM_Initial(void);


//---------------------------------------------------------------------------
// Configuration bits

_FOSC(CSW_FSCM_OFF & XT_PLL8); //XT with 8xPLL oscillator, Failsafe clock off
_FWDT(WDT_OFF); //Watchdog timer disabled
_FBORPOR(PBOR_OFF & MCLR_EN); //Brown-out reset disabled, MCLR reset enabled
_FGS(CODE_PROT_OFF); //Code protect disabled

typedef struct tagLEDBITS {

unsigned :8;
unsigned LED_Val:8;
} PORTDBITSS;
extern volatile PORTDBITSS LED_Ctrl __attribute__((__near__));


unsigned char TxData[10] = {0,0,0,0,0,0,0,0,0,0} ;

unsigned int ValuePDC ;

int SinTable[92] ;
int LoopVar1 ;
int U_Degree ;
int V_Degree ;
int W_Degree ;
int T1IF_Flag ;
int T1IF_Counter ;

unsigned int Temp_Uint ;

void __attribute__((__interrupt__)) _T1Interrupt(void)
{

U_Degree += 3;
if ( U_Degree > 360 ) U_Degree = 0 ;

{

if ( U_Degree <= 90 )
ValuePDC = ( SinTable[U_Degree]) + Volt0 ;

else if ( U_Degree > 90 && U_Degree <= 180 )
ValuePDC = ( SinTable[180 - U_Degree] )+ Volt0 ;

else if ( U_Degree > 180 && U_Degree <= 270 )
ValuePDC = Volt0 - ( SinTable[U_Degree - 180] ) ;

else if ( U_Degree > 270 && U_Degree <= 360 )
ValuePDC = Volt0 - ( SinTable[360-U_Degree] ) ;

PDC1 = ValuePDC ;
}

V_Degree = U_Degree + 180 ;
if ( V_Degree > 360 ) V_Degree = V_Degree - 360 ;

{
if ( V_Degree <= 90 )
ValuePDC = ( SinTable[V_Degree] )+ Volt0 ;

else if ( V_Degree > 90 && V_Degree <= 180 )
ValuePDC = ( SinTable[180 - V_Degree ] )+ Volt0 ;

else if ( V_Degree > 180 && V_Degree <= 270 )
ValuePDC = Volt0 - ( SinTable[V_Degree - 180]) ;

else if ( V_Degree > 270 && V_Degree <= 360 )
ValuePDC = Volt0 - ( SinTable[360-V_Degree] ) ;

PDC2 = ValuePDC ;
}

//W_Degree = U_Degree + 240 ;
//if ( W_Degree > 360 ) W_Degree = W_Degree - 360 ;

//{
//if ( W_Degree <= 90 )
//ValuePDC = ( SinTable[W_Degree] )+ Volt0 ;

//else if ( W_Degree > 90 && W_Degree <= 180 )
//ValuePDC = ( SinTable[180 - W_Degree ])+ Volt0 ;

//else if ( W_Degree > 180 && W_Degree <= 270 )
//ValuePDC = Volt0 - ( SinTable[W_Degree - 180]) ;

//else if ( W_Degree > 270 && W_Degree <= 360 )
//ValuePDC = Volt0 - ( SinTable[360-W_Degree]) ;

//PDC3 = ValuePDC ;
//}

}

void __attribute__((__interrupt__)) _PWMInterrupt(void)
{

IFS2bits.PWMIF = 0 ;
}


int main( void )

{


for ( LoopVar1 = 0 ; LoopVar1 < 91 ; LoopVar1 += 1)
{
SinTable[LoopVar1] = sin( (3.1415926 * LoopVar1) / (double)180 ) * MAX_HALF_DUTY ;
}

Initial_Timer1( ) ;
MotPWM_Initial( ) ;

TRISD &= 0x00ff ;
U_Degree = 0 ;

T1IF_Flag = 0 ;
T1IF_Counter = 0 ;

//putrsLCD("dsPIC30F2010 Dem") ;
//setcurLCD(0,1) ;
//putrsLCD("PWM Running ") ;

while (1)
{
}
}

void DelayNmSec(unsigned int N)
{
unsigned int j;
while(N--)
for(j=0;j < 1000;j++);
}


void Initial_Timer1( void )
{
ConfigIntTimer1( T1_INT_PRIOR_7 & T1_INT_ON ) ;
OpenTimer1( T1_ON & T1_IDLE_STOP & T1_GATE_OFF & T1_PS_1_1 & T1_SYNC_EXT_OFF & T1_SOURCE_INT ,
2048 ) ;
}

void MotPWM_Initial(void)
{
IEC2bits.PWMIE = 0 ; // Disable PWM Interrupt !!
IEC2bits.FLTAIE = 0 ;

OVDCON = 0xff00 ; // Inactive all PWM OUTPUT !!

TRISE = 0xffc0 ;
PTCON = 0xa000 ; // Configure as 0b1010 0000 0000 0000
// PWM Time Base OFF , PWM Time Base OP in free running Mode
PWMCON1 = 0x0077 ; // Configure as 0b0000000000010001
// PWM I/O in complementary Mode and only PWM1L/H as PWM output
PWMCON2 = 0x0000 ; // Configure as 0b0000000000000000

DTCON1 = 0x0101 ; // Configure as 0b0000001000000010 ;

FLTACON = 0x0000 ;

IPC9bits.PWMIP = 6 ;

// ---------------------------------------------------------------------------------
// The Switching Frequency !!
// PWM resolution >= 10 bits ,
// PDCx[1:15] compare with PTMR [0:14]
// PDCx(0) compare with MSB of prescaler counter
// So, PTPER is 9 bit if resolution of PDCx is 10 bit
// Setting PWM Frequency = 20K
// PTPER = ( (7372800*2)/ 20000 ) -1 = 736.28 = 736
// PWM Frequency will be Fcy/736 = 20.0K
// Formular !! PTPER = (Fcy/(FPWM*PTMR Prescaler)) - 1
// ---------------------------------------------------------------------------------
PTPER = 736 ; // PWM Time Base Period Register
ValuePDC = 0x00 ;

PDC1 = ValuePDC ;
PDC2 = ValuePDC ;
//PDC3 = ValuePDC ;

}

跟你建的sin table有關, 如果你的中斷是20kHz, 建的點數就要有20kHz/60Hz的點, 如此一點一點丟給duty, 還有就是你sin table的振幅(與counter的值比較)也要大一點, 90%~100%左右, 再加上dead time效應, 用示波器就可以看出明顯的60Hz了!

我已經做出來會自動調變的PWM....
不過無法輸出60Hz的弦波.....
不知道是不是外部震盪器不足.....
因為請問震盪器6MHz需要搭配多少的電容值....

既然會跟著改變, 那接著就建sin table 一點一點抓 不就okㄌ?

我有試過如果輸入值變化...
Duty會跟隨著改變....
但是無法達到自動變動的Duty....
是否有哪邊可以改變嗎???
或是有什麼程式可以達到簡單的PWM自動調變的方法嗎???

建議你先從簡單的試試, 先給常數變化看duty是否跟著變, 範例程式只是參考, 因為每個condition都不一樣, 由小到大是比較好處理的!

建議你先從簡單的試試, 先給常數變化看duty是否跟著變, 範例程式只是參考, 因為每個condition都不一樣, 由小到大是比較好處理的!

可以請教....
我有找到用組語寫的PWM....
程式裡有讀取 Sine table的值....
不過測試時....
卻只讀0值....
而非整個 Sine table之值....
可以請教怎麼修改嗎???

下列是我所找到之程式....

;******************************************************************************
; *
; Filename : acim_vhz.s *
; *
;******************************************************************************
; Notes: *
; ====== *
; The A/D is enabled to sample two pots on the dsPICDEM-MC1 demo board *
; connected to AN7 and AN12. VR1 is used to vary the V/Hz ratio of the *
; modulation. VR2 is used to vary the modulation frequency. By *
; experimenting with the two pot settings, you can find an optimal V/Hz *
; ratio to drive the motor. *
;******************************************************************************

;*** This code has been modified to drive a split phase motor with a
;*** H bridge, OR with a single complementary output pair.

.equ __30F2010, 1
.include "C:\pic30_tools\support\inc\p30f2010.inc"

.global __reset

;..............................................................................
;Configuration bits:
;..............................................................................

config __FOSC, CSW_FSCM_OFF & XT_PLL4 ;Turn off clock switching and
;fail-safe clock monitoring and
;use the XT osc and 4x PLL as
;system clock

config __FWDT, WDT_OFF ;Turn off Watchdog Timer

config __FBORPOR, PBOR_ON & BORV_27 & PWRT_16 & MCLR_EN
;Set Brown-out Reset voltage and
;and set Power-up Timer to 16msecs

config __FGS, CODE_PROT_OFF ;Set Code Protection Off for the
;General Segment


;..............................................................................
;Uninitialized variables in Near data memory (Lower 8Kb of RAM)
;..............................................................................

.section .nbss, "b"

; This variable is added to the 16-bit sine wave table pointer at each
; PWM period. A value of 246 will provide 60 Hz modulation frequency
; with 16 KHz PWM
Frequency: .space 2

; This variable is used to set the modulation amplitude and scales the
; value retrieved from the sine wave table. Valid values range from 0
; to 32767
Amplitude: .space 2

; This variable is the pointer to the sinewave table. It is incremented
; by the value of the Frequency variable at each PWM interrupt.
Phase: .space 2

;..............................................................................
;Constants stored in Program space
;..............................................................................

.section .sine_table, "x"
.align 256
; This is a 64 entry sinewave table covering 360 degrees of the
; sine function. These values were calculated using Microsoft
; Excel and pasted into this program.

SineTable:
.hword 0,3212,6393,9512,12539,15446,18204,20787,23170,25329
.hword 27245,28898,30273,31356,32137,32609,32767,32609,32137,31356,30273,28898
.hword 27245,25329,23170,20787,18204,15446,12539,9512,6393,3212,0,-3212,-6393
.hword -9512,-12539,-15446,-18204,-20787,-23170,-25329,-27245,-28898,-30273
.hword -31356,-32137,-32609,-32767,-32609,-32137,-31356,-30273,-28898,-27245
.hword -25329,-23170,-20787,-18204,-15446,-12539,-9512,-6393,-3212


;..............................................................................
; Constants for this application
;..............................................................................



; This constant is used to scale the sine lookup value to the valid range
; of PWM duty cycles. This is based on the value written to PTPER. We will
; PTPER = 230 for this application, which allows duty cycles between 0 and
; 460. The sine table data is signed, so we will multiply the table data
; by 230, then add a constant offset to scale the lookup data to positive
; values
.equ PWM_Scaling, 230
;.equ xd, 100
; The pointer to the sign wave table is 16 bits. Adding 0x5555 to the
; pointer will provide a 120 degree offset and 0xAAAA will give a 240
; degree offset. These offsets are used to get the lookup values for
; phase 2 and phase 3 of the PWM outputs.
;.equ Offset_120, 0x5555

;*** Added this offset to drive the split phase motor. We need an output
;*** that is shifted by 180 degrees.
.equ Offset_180,0x8000
;..............................................................................
;Code Section in Program Memory
;..............................................................................

.text ;Start of Code section
__reset:
MOV #__SP_init, W15 ;Initalize the Stack Pointer
MOV #__SPLIM_init, W0 ;Initialize the Stack Pointer Limit Register
MOV W0, SPLIM
NOP ;Add NOP to follow SPLIM initialization

CALL _wreg_init ;Call _wreg_init subroutine
;Optionally use RCALL instead of CALL


call Setup ; Call the routine to setup I/O and PWM
;------------------------------------------------------------------------------
; Variable initialization
;------------------------------------------------------------------------------

clr Frequency
clr Amplitude

;------------------------------------------------------------------------------
; Main loop code
; The PWM interrupt flag is polled in the main loop
;------------------------------------------------------------------------------

Loop: btss IFS2,#PWMIF ; poll the PWM interrupt flag
bra CheckADC ; if it is set, continue

call Modulation ; call the sinewave modulation routine
bclr IFS2, #PWMIF ; Clear the PWM interrupt flag
;call Loop
CheckADC:
btss IFS0,#ADIF
bra Loop

call ReadADC

bra Loop
;call Loop
;------------------------------------------------------------------------------
; ADC processing subroutine
;------------------------------------------------------------------------------
ReadADC:

push.d W0
push.d W4

mov ADCBUF0,W0 ; Read the ADC results into W0
mov ADCBUF1,W1 ; and W1.

asr W0,#2,W4 ; Right shift by 2 bits to get the
mov W4,Frequency ; modulation frequency.

sl W1,#5,W4 ; Left shift AN7 and AN12 values to get
sl W0,#5,W5 ; 1.15 fractional data.
mpy W4*W5,A ; multiply frequency by V/Hz gain to get
sac A,W0 ; mod. amplitude. Store result in W0
mov #28000,W1 ; Limit modulation amplitude to avoid
cp W1,W0 ; dead-time induced distortion in PWM
bra GE,NoLimit ; modulation.
mov W1,W0
NoLimit:
mov W0,Amplitude

pop.d W4
pop.d W0

return

;------------------------------------------------------------------------------
; PWM sine wave modulation subroutine
;------------------------------------------------------------------------------
Modulation:
push.d W0 ; Save off working registers
push.d W2
push.d W4
push.d W6
push.d W8
push.d W10

; The next three instructions initialize the TBLPAG and pointer register
; for access to the sinewave data in program memory using table reads.

mov #tblpage(SineTable),W0
mov W0,TBLPAG
mov #tbloffset(SineTable),W0

; The next block of instructions loads various constants and variables
; used in the sinewave modulation routine.

mov Phase,W1 ; Load the sinewave table pointer
;*** Modified the offset to 180 degrees for split phase motor.
mov #Offset_180,W4 ; This is the value for a 180 degree offset
mov Amplitude,W6 ; Load the Amplitude scaling factor
;mov #1,W6
mov #PWM_Scaling,W7 ; Load the PWM scaling value
mov Frequency,W8 ; Load the Frequency constant that will
; be added to the table pointer at each
; interrupt.

; This is the pointer adjustment code. The Frequency value is added
; to the sine pointer to move through the sine table. Then, offsets
; are added to this pointer to get the phase 2 and phase 2 pointers.
; Note: If different phase offsets are desired, other constant values
; can be used here. Add 0x4000 to get a 90 degree offset, 0x8000 will
; provide a 180 degree offset. Here, 0x5555 has been loaded to W4
; to provide 120 degrees.

add W8,W1,W1 ; Add the Frequency value to the sine pointer
add W1,W4,W2 ; Add 180 degree offset value for phase 2
;*** Don't need the following line for split phase motor
;add W2,W4,W3 ; Add another 120 degree offset for phase 3

; The sine table has 64 entries, so the pointers are right shifted
; to get a 6-bit pointer value.

lsr W1,#10,W9 ; Shift the phase 1 pointer right to get the upper 6 bits
sl W9,#1,W9 ; Left shift by one to convert to byte address
lsr W2,#10,W10 ; Shift the phase 2 pointer right to get the upper 6 bits
sl W10,#1,W10 ; Left shift by one to convert to byte address
;*** Removed for split phase motor
;lsr W3,#10,W11 ; Shift the phase 3 pointer right to get the upper 6 bits
;sl W11,#1,W11 ; Left shift by one to convert to byte address

; Now, the pointer for each phase is added to the base table pointer
; to get the absolute table address for the lookup value. The lookup
; value is then scaled for the correct amplitude and for the range
; of valid duty cycles. The next block of instructions calculates
; the duty cycle for phase 1. The phase 2 and phase 3 code is the same.

add W0,W9,W9 ; Form the table address for phase 1
tblrdl [W9],W5 ; Read the lookup value for phase 1
mpy W5*W6,A ; Multiply by the amplitude scaling
sac A,W5 ; Store the scaled result
mpy W5*W7,A ; Multiply by the PWM scaling factor
sac A,W8 ; Store the scaled result
add W7,W8,W8 ; Add the PWM scaling factor to produce 50% offset
;mov #xd,W8
mov W8,PDC1 ; Write the PWM duty cycle

; The next block of code calculates the duty cycle for phase 2.

add W0,W10,W10 ; Form the table address for phase 2
tblrdl [W10],W5 ; Read the lookup value for phase 2
mpy W5*W6,A ; Multiply by the amplitude scaling
sac A,W5 ; Store the scaled result
mpy W5*W7,A ; Multiply by the PWM scaling factor
sac A,W8 ; Store the scaled result
add W7,W8,W8 ; Add the PWM scaling factor to produce 50% offset
;mov #xd,W8
mov W8,PDC2 ; Write the PWM duty cycle

; The next block of code calculates the duty cycle for phase 3.

;*** Don't need the following block of code for split phase motor.
;add W0,W11,W11 ; Form the table address for phase 3
;tblrdl [W11],W5 ; Read the lookup value for phase 3
;mpy W5*W6,A ; Multiply by the amplitude scaling
;sac A,W5 ; Store the scaled result
;mpy W5*W7,A ; Multiply by the PWM scaling factor
;sac A,W8 ; Store the scaled result
;add W7,W8,W8 ; Add the PWM scaling factor to produce 50% offset
;mov W8,PDC3 ; Write the PWM duty cycle

; Now, save off the adjusted sinewave table pointer so it can be
; used during the next iteration of this code.

mov W1,Phase
;inc xd


pop.d W10 ; restore working registers
pop.d W8
pop.d W6
pop.d W4
pop.d W2
pop.d W0

return ; return from the subroutine

;------------------------------------------------------------------------------
; PWM and ADC setup code
;------------------------------------------------------------------------------

Setup:

; The first thing we need to do before enabling the PWM is to
; configure the I/O and reset the power module. The control board
; has a driver IC that buffers the PWM control lines. The active
; low output enable for this buffer is on port RD11.
; The power module has an active high reset line which is connected
; to port RE9.

clr PORTD
clr PORTE
mov #0xF7FF,W0 ; Make RD11 an output to drive PWM buffer
mov W0,TRISD ; output enable.
mov #0xFDFF,W0 ;
mov W0,TRISE ; Make RE9 an output for power module reset

; Now, ensure the power module is reset by driving the reset line for
; a few usec.

bset PORTE,#9
repeat #39
nop
bclr PORTE,#9

; Setup the ADC

mov #0x0404,W0 ; scan inputs
mov W0,ADCON2 ; 2 sample/converts per interrupt
mov #0x0003,W0 ;
mov W0,ADCON3 ; Tad is 2*Tcy
clr ADCHS ;
clr ADPCFG ; all A/D pins Analog mode
clr ADCSSL ;
bset ADCSSL,#7 ; enable scan of AN7
bset ADCSSL,#12 ; enable scan of AN12
mov #0x8066,W0 ; enable A/D, PWM trigger, auto sample
mov W0,ADCON1 ;
bclr IFS0,#ADIF ; clear A/D interrupt flag

; Now, setup the PWM registers

;*** Modified next line of code for split phase motor.
mov #0x0033,W0 ; complementary mode, #1, #2
mov W0,PWMCON1 ; pairs are enabled
mov #0x000F,W0 ; 2usec deadtime at 7.38 MIPS
mov W0,DTCON1
mov #PWM_Scaling, W0 ; set period for 16KHz PWM at 7.38 MIPS
mov W0,PTPER
mov #0x0001,W0 ;
mov W0,SEVTCMP ; setup the special event trigger for the ADC
mov #0x0F00,W0 ; set the special event postscaler to 1:16
mov W0,PWMCON2 ;
mov #0x8002,W0 ; PWM timebase enabled, center aligned mode
mov W0,PTCON

return ; return from the Setup routine

;..............................................................................
;Subroutine: Initialization of W registers to 0x0000
;..............................................................................

_wreg_init:
CLR W0
MOV W0, W14
REPEAT #12
MOV W0, [++W14]
CLR W14
RETURN

;--------End of All Code Sections ---------------------------------------------

.end ;End of program code in this file

我有試過裡面的Soure Core....
不過不知為何還是無法做調整.....
有沒有更明確的講法呢???
還有我有找到感應馬達控制....
不過依舊無法自動調變.....
是否ㄧ定要外加電壓作為調整才行呢???
還有程式需要如何修改???

下列是我所使用之範例程式....

// ***********************************************************************
// File : EX15_3_MCPWM.C
// Purpose : 練習如何使用 Microchip C30 提供的 PWM 函式庫
//
// 使用的函式庫:
// pwm
// adc10
//
// ***********************************************************************

#define __dsPIC30F2010__

#include <p30F2010.h>
#include <pwm.h> // 將pwm函式的原型宣告檔案含入


#define FCY 7372800 * 2 // 因為使用頻率為將外部 7.3728 MHz * 8 的模式 , 每一指令週期需 4 個 clock
// 所以 FCY = (7.3728 * 8 / 4 ) MHz = 7372800* 2

_FOSC(CSW_FSCM_OFF & XT_PLL8); //XT with 8xPLL oscillator, Failsafe clock off
_FWDT(WDT_OFF); //Watchdog timer disabled
_FBORPOR(PBOR_OFF & MCLR_EN); //Brown-out reset disabled, MCLR reset enabled
_FGS(CODE_PROT_OFF); //Code protect disabled

void Init_MCPWM(void);


const char My_String1[]="Ex 15 - MCPWM" ; // 宣告字串於 Program Memory (因為 const 宣告)
char My_String2[]="VR1: VR2: " ; // 宣告字串於 Data Memory


int main(void)
{
Init_MCPWM( );
while (1);
}


/******************************************************/
// Subroutine to configure the Motor Control PWM module

void Init_MCPWM(void)
{
/* Holds the PWM interrupt configuration value*/
unsigned int config;
/* Holds the value to be loaded into dutycycle register */
unsigned int period;
/* Holds the value to be loaded into special event compare register */
unsigned int sptime;
/* Holds PWM configuration value */
unsigned int config1;
/* Holds the value be loaded into PWMCON1 register */
unsigned int config2;
/* Holds the value to configure the special event trigger postscale and dutycycle */
unsigned int config3;
/* The value of ‘dutycyclereg’ determines the duty cycle register(PDCx) to be written */
unsigned int dutycyclereg;
unsigned int dutycycle;
unsigned char updatedisable;
/* Configure pwm interrupt enable/disable and set interrupt priorties */
config = (PWM_INT_DIS & PWM_FLTA_DIS_INT & PWM_INT_PR1
& PWM_FLTA_INT_PR0);
ConfigIntMCPWM( config );
/* Configure PWM to generate square wave of 50% duty cycle */
SetMCPWMDeadTimeGeneration(PWM_DTA20 & PWM_DTAPS4 & PWM_DTB40 & PWM_DTBPS4);
dutycyclereg = 1;
dutycycle = 0x1FF;
updatedisable = 0;
// SetDCMCPWM(dutycyclereg,dutycycle,updatedisable);
PDC1=0x1FF;
PDC2=0x1FF;
PDC3=0x1FF;
period = 0x2ff;
sptime = 0x0;
config1 = (PWM_EN & PWM_IDLE_STOP & PWM_OP_SCALE1
& PWM_IPCLK_SCALE1 &
PWM_MOD_FREE);
config2 = (PWM_MOD1_COMP & PWM_MOD2_COMP &
PWM_PDIS3H & PWM_PEN2H & PWM_PEN1H &
PWM_PDIS3L & PWM_PEN2L & PWM_PEN1L);
config3 = (PWM_SEVOPS1 & PWM_OSYNC_PWM & PWM_UEN);
OpenMCPWM(period,sptime,config1,config2,config3);

}

pic 要自己建sin table, dspic如果速度夠快可用內建的sin function, 如果未來要做到閉迴路控制, 建sin table是比較好的