TMS320F2812+pwm

TMS320F2812是一款数字信号处理器，可以用于产生PWM信号输出。下面是一个简单的示例代码，演示如何在TMS320F2812上使用PWM模块产生PWM信号输出：

#include "DSP281x_Device.h"
#include "DSP281x_Examples.h"

void InitEPwm1(void);

void main(void)
{
    InitSysCtrl();
    InitEPwm1();

    EINT;  // Enable Global interrupt INTM
    ERTM;  // Enable Global realtime interrupt DBGM

    while(1) {}
}

void InitEPwm1()
{
    EPwm1Regs.TBPRD = 600;       // Set period to 600 TBCLK counts
    EPwm1Regs.TBPHS.bit.TBPHS = 0; // Phase is 0
    EPwm1Regs.TBCTR = 0;         // Clear counter

    // Setup TBCLK
    EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up and down
    EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE;        // Disable phase loading
    EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1;       // Clock ratio to SYSCLKOUT
    EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1;

    // Setup shadow register load on ZERO
    EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
    EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
    EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;
    EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;

    // Set Compare values
    EPwm1Regs.CMPA.half.CMPA = 300;    // Set duty 50% initially
    EPwm1Regs.CMPB = 300;

    // Set actions
    EPwm1Regs.AQCTLA.bit.CAU = AQ_SET; // Set PWM1A on Zero
    EPwm1Regs.AQCTLA.bit.CAD = AQ_CLEAR;
    EPwm1Regs.AQCTLB.bit.CBU = AQ_SET; // Set PWM1B on Zero
    EPwm1Regs.AQCTLB.bit.CBD = AQ_CLEAR;

    // Interrupt where we will change the Compare Values
    EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; // Select INT on Zero event
    EPwm1Regs.ETSEL.bit.INTEN = 1;            // Enable INT
    EPwm1Regs.ETPS.bit.INTPRD = ET_3RD;       // Generate INT on 3rd event

    // Start by increasing the compare A and decreasing compare B
    epwm1_info.EPwm_CMPA_Direction = EPWM_CMP_UP;
    epwm1_info.EPwm_CMPB_Direction = EPWM_CMP_DOWN;
    epwm1_info.EPwmTimerIntCount = 0;
    epwm1_info.EPwmRegHandle = &EPwm1Regs;

    // Enable CPU INT
    IER |= M_INT3;

    // Enable EPWM INTn in the PIE: Group 3 interrupt 1-3
    PieCtrlRegs.PIEIER3.bit.INTx1 = 1;
}