1、頭文件 spwm.h/*普通SPWM程序*/#ifndef _NORMAL_SPWM_H#define _NORMAL_SPWM_H/SPWM 表結構體 三項公用一個表 typedef struct _SPWM_table Uint16 TableSize; /表大小 即表中所有數據 Uint16 SpwmSize; /SPWM表大小 volatile Uint16 *p_SPWM_A; /A相指針 volatile Uint16 *p_SPWM_B; /B相指針 volatile Uint16 *p_SPWM_C; /C相指針 Uint16 *p_HeadTable; /表頭指針 指向SPW

2、M表SPWM_TABLE;extern SPWM_TABLE g_SPWM_Table; /全局SPWM表 void InitSpwm(void);void StartSpwm(void);interrupt void ISR_T1UFINT_NORMAL_FUNC(void);void CalcSpwmWithSym(float32 a/*調制比*/,float32 w_Hz/*調制頻率*/,float32 z_Hz/*載波頻率*/);void CalcSpwmWithImSym(float32 a/*調制比*/,Uint16 w_Hz/*調制頻率*/,Uint32 z_Hz/*載波頻率*/

3、);void CalcSpwmWithArea(float32 a/*調制比*/,Uint16 w_Hz/*調制頻率*/,Uint32 z_Hz/*載波頻率*/);#endif源文件#include "DSP281x.h"#include "SPWM.h"#include "float.h"#include "math.h"#define MAX_BUF 400#define PI 3.1415926Uint16 g_spwm_dataMAX_BUF; /表的數據存儲SPWM_TABLE g_SPWM_Table;

4、 /全局SPWM表 /SPWM初始化程序void InitSpwm(void) g_SPWM_Table.p_HeadTable = g_spwm_data ; /指向數據表 g_SPWM_Table.TableSize = MAX_BUF; /存儲表的大小 EALLOW; PieVectTable.T1UFINT=&ISR_T1UFINT_NORMAL_FUNC; EDIS; IER|=M_INT2; /開中斷2void StartSpwm(void)/對稱規則采樣法void CalcSpwmWithSym(float32 a/*調制比*/,float32 w_Hz/*調制頻率*/,

5、float32 z_Hz/*載波頻率*/) Uint16 tmp_PR; /T1周期值 volatile Uint16 i,n,*p; float32 m; m = z_Hz/w_Hz ; /求出載波比 g_SPWM_Table.SpwmSize =(Uint16)m; tmp_PR = g_T1_Clk /(2*z_Hz); /計算出其周期值 p=g_SPWM_Table.p_HeadTable; /得到數據表頭指針 for(i=0;i<(Uint16)m;i+) n=tmp_PR*(0.5-0.5*a*sin(i+0.75)*2*PI/m); *p=n; p+; /不對稱規則采樣法v

6、oid CalcSpwmWithImSym(float32 a/*調制比*/,Uint16 w_Hz/*調制頻率*/,Uint32 z_Hz/*載波頻率*/) Uint16 tmp_PR; /T1周期值 volatile Uint16 i,n,*p; float32 m; m = z_Hz/w_Hz ; /求出載波比 g_SPWM_Table.SpwmSize =(Uint16)m; tmp_PR = g_T1_Clk /(2*z_Hz); /計算出其周期值 p=g_SPWM_Table.p_HeadTable; /得到數據表頭指針 for(i=0;i<(Uint16)m;i+) n=t

7、mp_PR*(0.5-0.25*a*(sin(i+0.25)*2*PI/m)+sin(i+0.75)*2*PI/m); *p=n; p+; /面積法 void CalcSpwmWithArea(float32 a/*調制比*/,Uint16 w_Hz/*調制頻率*/,Uint32 z_Hz/*載波頻率*/) /Uint16 tmp_PR; /T1周期值 volatile Uint16 i,n,*p; float32 m,n1,n2; m = z_Hz/w_Hz ; /求出載波比 g_SPWM_Table.SpwmSize =(Uint16)m; /tmp_PR = g_T1_Clk /(2*z_Hz); /計算出其周期值 p=g_SPWM_Table.p_HeadTable; /得到數據表頭指針 n=m; m/=2; /除去一半 計算半波 n1=(float32)g_T1_Clk/(8.0*m*w_Hz); / 計算首相 n2=(float32)g_T2_Clk/(8.0*PI*w_Hz)*a; for(i=0;i<n;i+) *p=n1-n2*(cos(i*PI/m)-cos(i+1)*PI/m); p+; /中斷程序interrupt void ISR_T1UFINT_NORMAL_