DSP-280025 PWM 调试

#include "f28002x_device.h"
#include "f28002x_examples.h"

/****************************************************************************************************/
#define CPU_CLOCK  100e6                    //系统时钟100MHz
//#define USR_PWM_FREQ   1039               //PWM 设定频率 1K  ,修正系数0.9623
#define PWM_CORRECTION_FACTOR  1.039
//#define PWM_PERIOD (CPU_CLOCK/(2*USR_PWM_FREQ)) //周期寄存器的值, 向上向下计数，所以*2
#define TBCTLVAL   0x200E                   //控制寄存器的值

//#define DUTY_CIRCUL  60
//#define PWM_CMPA_VALUE  (PWM_PERIOD*DUTY_CIRCUL/100)

#define ON_GET_PWM_TIMBASW_PERIOD(usr_PWM_Freq)  (CPU_CLOCK/(2 * usr_PWM_Freq))
#define ON_GET_PWM_CMPA(usr_PWM_Freq,usr_PWM_DutyHigh)  ((CPU_CLOCK/(2 * usr_PWM_Freq)) * usr_PWM_DutyHigh / 100)
//

static void bsp_s_ePWMGpioInit(void)
{
    EALLOW;
    /*设置时钟允许*/
    CpuSysRegs.PCLKCR0.bit.TBCLKSYNC = 1;   //BIT2 TBCLKSYNC
    CpuSysRegs.PCLKCR2.bit.EPWM5 = 1;       // ePWM5

    GpioCtrlRegs.GPAPUD.bit.GPIO8 = 0;      //使能GPIO8 内部上拉
    GpioCtrlRegs.GPAQSEL1.bit.GPIO8 = 0;    // Synch to SYSCLKOUT GPIO8 (ePWM5_A)
    GpioCtrlRegs.GPAMUX1.bit.GPIO8 = 1;     // 00:GPIO8   01:ePWM5_A  10:Reserved  11:Reserved
    GpioCtrlRegs.GPADIR.bit.GPIO8 = 1;
    EDIS;
}

//This function will initialize the pwm module with the
//specified frequence and duty,
//And start the pwm module.
void bsp_ePWMSetUp(float _pwmFreq,float _pwmDutyHigh)
{
    
    EALLOW;
    //Enable the clock
    CpuSysRegs.PCLKCR0.bit.TBCLKSYNC = 1;   //BIT2 TBCLKSYNC
    CpuSysRegs.PCLKCR2.bit.EPWM5 = 1;       // ePWM5

    bsp_s_ePWMGpioInit(); //初始化GPIO
 

   #if 1
    //时间基准寄存器
    EPwm5Regs.TBPRD = ON_GET_PWM_TIMBASW_PERIOD(_pwmFreq) - 1;   // 时基计数周期
    EPwm5Regs.TBPHS.all = 0;          // Set Phase register to zero
    EPwm5Regs.TBCTR = 0;              //Clear TB counter,计数器初始值为零

    EPwm5Regs.CMPA.bit.CMPA = ON_GET_PWM_CMPA(_pwmFreq,_pwmDutyHigh) * PWM_CORRECTION_FACTOR; //设定Capture A 的捕获值

    //设置TBCLK = ?M
    EPwm5Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1;    // TBCLK = SYSCLK
    EPwm5Regs.TBCTL.bit.CLKDIV = TB_DIV1;

    //设置计数模式
    EPwm5Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN;  //UP_DOWMCount Mode

    //设定动作
    EPwm5Regs.AQCTLA.bit.CAU = AQ_CLEAR; //当计数器等于主CMPA寄存器并且计数递增时动作：计数器等于CPMA时ePWMA输出变低
    EPwm5Regs.AQCTLA.bit.CAD = AQ_SET;   //当计数器等于主CMPA寄存器并且计数递减时动作：计数器等于周期值时wPWMA输出变高

   EPwm5Regs.CMPCTL.bit.SHDWAMODE = CC_IMMEDIATE;
    //EPwm5Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
    EPwm5Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // load on CTR = Zero
    //EPwm5Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // load on CTR = Zero
    //EPwm5Regs.AQCTLA.bit.ZRO = AQ_SET;

    EPwm5Regs.TBCTL.bit.FREE_SOFT = 2;
    EPwm5Regs.TBCTL.bit.PHSEN = TB_DISABLE;     //Phase loading disabled
    EPwm5Regs.TBCTL.bit.PRDLD = TB_SHADOW; //主周期寄存器

    EPwm5Regs.TZCLR.all = 0x0000;
    EPwm5Regs.TZSEL.all = 0x0000; //TZ2使能  0x0200
    EPwm5Regs.TZCTL.all = 0x0000;

    EPwm5Regs.AQSFRC.all  = 0x0;
    EPwm5Regs.AQCSFRC.all = 0x0;
    EPwm5Regs.DBCTL.all = 0x0;   //If trip,Do nothing, no action is taken on EPWMxA.
    #endif
    EDIS;
}

void bsp_ePWM_UpdateFreqAndPeriod(float _pwmFreq,float _pwmDutyHigh)
{
    EPwm5Regs.TBPRD = ON_GET_PWM_TIMBASW_PERIOD(_pwmFreq) - 1;   // 时基计数周期
    EPwm5Regs.CMPA.bit.CMPA = ON_GET_PWM_CMPA(_pwmFreq,_pwmDutyHigh)*PWM_CORRECTION_FACTOR; //设定Capture A 的捕获值
}

void bsp_ePWMSetStop()
{
    EPwm4Regs.CMPA.bit.CMPA = 5000;
}

传统方法：

#define CPUTIMER0 (volatile unsigned long*) 0x0c00

缺点: 不便对寄存器的值进行位操作；
         无法单独查看寄存器的某一位。 

DSP外设寄存器定义：

• 第一步：采用结构体、共用体、位域结构定义寄存器变量；
• 第二步：通过 pragma 伪指令将寄存器变量分配到数据段；
• 第三步：通过 MEMORY 伪指令指示寄存器的实际硬件空间；
• 第四步：通过 SECTION 伪指令将寄存器数据段分配到实际硬件空间。

举例：【以 PCLKCR1 外设时钟控制寄存器1 为例（TMS320F2803x）】

第一步：定义寄存器变量

• 1、位域结构体定义外设时钟控制寄存器1 PCLKCR1

struct PCLKCR1_BITS  {      // bits  description
    Uint16 EPWM1ENCLK:1;    // 0     Enable SYSCLKOUT to EPWM1
    Uint16 EPWM2ENCLK:1;    // 1     Enable SYSCLKOUT to EPWM2
    Uint16 EPWM3ENCLK:1;    // 2     Enable SYSCLKOUT to EPWM3
    Uint16 EPWM4ENCLK:1;    // 3     Enable SYSCLKOUT to EPWM4
    Uint16 EPWM5ENCLK:1;    // 4     Enable SYSCLKOUT to EPWM5
    Uint16 EPWM6ENCLK:1;    // 5     Enable SYSCLKOUT to EPWM6
    Uint16 EPWM7ENCLK:1;    // 6     Enable SYSCLKOUT to EPWM7
    Uint16 rsvd1:1;         // 7     reserved
    Uint16 ECAP1ENCLK:1;    // 8     Enable SYSCLKOUT to ECAP1
    Uint16 rsvd2:5;         // 13:9  reserved
    Uint16 EQEP1ENCLK:1;    // 14    Enable SYSCLKOUT to EQEP1
    Uint16 rsvd3:1;         // 15    reserved
};

• 2、共用体定义外设时钟控制寄存器1 PCLKCR1

union PCLKCR1_REG {
    Uint16              all;
    struct PCLKCR1_BITS bit;
};

• 3、结构体定义系统控制结构体，包含系统控制所有寄存器

struct SYS_CTRL_REGS {
    union   XCLK_REG        XCLK;        // 0: XCLKOUT Control
    union   PLLSTS_REG      PLLSTS;      // 1: PLL Status Register
    union   CLKCTL_REG      CLKCTL;      // 2: Clock Control Register
    Uint16                  PLLLOCKPRD;  // 3: PLL Lock Period Register
    union   INTOSC1TRIM_REG INTOSC1TRIM; // 4: Internal Oscillator 1 Trim
    Uint16                  rsvd1;       // 5: reserved
    union   INTOSC2TRIM_REG INTOSC2TRIM; // 6: Internal Oscillator 2 Trim
    Uint16                  rsvd2[2];    // 8-7
    
    //
    // 9: Peripheral clock control register 2
    //
    union   PCLKCR2_REG     PCLKCR2;     
    
    Uint16                  rsvd3;       // 10
    
    //
    // 11: Low-speed peripheral clock pre-scaler
    //
    union   LOSPCP_REG      LOSPCP;      
    
    //
    // 12: Peripheral clock control register
    //
    union   PCLKCR0_REG     PCLKCR0;     
    
    //
    // 13: Peripheral clock control register
    //
    union   PCLKCR1_REG     PCLKCR1;     
    
    //
    // 14: Low-power mode control register 0
    //
    union   LPMCR0_REG      LPMCR0;      
    
    Uint16                  rsvd4;       // 15: reserved
    union   PCLKCR3_REG     PCLKCR3;     // 16: Peripheral clock register
    union   PLLCR_REG       PLLCR;       // 17: PLL control register
    
    //
    // No bit definitions are defined for SCSR because
    // a read-modify-write instruction can clear the WDOVERRIDE bit
    //
    Uint16                  SCSR;      //18: System control and status register
    
    Uint16                  WDCNTR;    //19: WD counter register
    Uint16                  rsvd5;     //20
    Uint16                  WDKEY;     //21: WD reset key register
    Uint16                  rsvd6[3];  //22-24
    
    //
    // No bit definitions are defined for WDCR because
    // the proper value must be written to the WDCHK field
    // whenever writing to this register.
    //
    Uint16                  WDCR;        // 25: WD timer control register
    
    Uint16                  rsvd7[6];    // 26-30
};

• 4、定义系统控制结构体变量

extern volatile struct SYS_CTRL_REGS SysCtrlRegs;

第二步： 将寄存器变量分配到数据段

代码位于：DSP2803x_GlobalVariableDefs.c

#ifdef __cplusplus
#pragma DATA_SECTION("SysCtrlRegsFile")
#else
#pragma DATA_SECTION(SysCtrlRegs,"SysCtrlRegsFile");
#endif
volatile struct SYS_CTRL_REGS SysCtrlRegs;

第三步： 指示寄存器的实际硬件空间

代码位于：DSP2803x_Headers_nonBIOS.cmd

MEMORY
{

 PAGE 1:    /* Data Memory */

   SYSTEM      : origin = 0x007010, length = 0x000020     /* System control registers */

}

第四步： 将寄存器数据段分配到实际硬件空间

代码位于：DSP2803x_Headers_nonBIOS.cmd

SECTIONS
{
/*** Peripheral Frame 2 Register Structures ***/
   SysCtrlRegsFile   : > SYSTEM,      PAGE = 1
}

中断：