[参考译文] 示波器上未显示 ePWM 输出/缺少 SYNCOUT

我能够复制您的配置并附加了生成预期输出的代码。  

标准：

-来自100MHz 时基时钟的50%占空比对称 PWM、具有10kHz PWM 信号

- 500 ns 的死区延迟

下面是示波器的屏幕截图。

//
// Included Files
//
#include "F28x_Project.h"
#include "driverlib.h"
#include "device.h"

void init_GPIO(void);
void ConfigEPwm1(void);
void init_device(void);



void ConfigEPwm1(void)//q
{
    // Time Base config
    EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT
    EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1; // Scale time base clock relative to ePWM clock (TBCLK), TBCLK = 1/(100MHz) = 10 ns
    EPwm1Regs.TBPRD = 5000; // Set timer period, Freq. of pwm = 10kHz (Configure TBCTR freq or period)
    EPwm1Regs.TBPHS.bit.TBPHS = 0; // Phase is 0
    EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Set the mode for time base counter: Count up/down
    EPwm1Regs.TBCTR = 0x0000; // Clear counter
    EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading
    EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_CTR_ZERO; // Sync output select
    SyncSocRegs.SYNCSELECT.bit.SYNCOUT = 0; //EPWM1SYNCOUT specify source for sync output of ePWM module (SYNCOUT from figure 15-7 TRM)

    // Counter Compare
    EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; // Load registers every ZERO
    EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO_PRD;
    EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW; // Load registers every ZERO
    EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO_PRD;
    EPwm1Regs.CMPA.bit.CMPA = EPwm1Regs.TBPRD >> 1; // 2500

    // Action Qualifier sets epwm1a 1b outputs
    EPwm1Regs.AQCTLA.bit.PRD = AQ_NO_ACTION;
    EPwm1Regs.AQCTLA.bit.ZRO = AQ_NO_ACTION;
    EPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR; // set off on up count
    EPwm1Regs.AQCTLA.bit.CAD = AQ_SET; // set on down count
    // Deadband module
    EPwm1Regs.DBCTL.bit.POLSEL = DB_ACTV_HIC; // Active Hi complementary
    EPwm1Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; // enable Dead-band module
    EPwm1Regs.DBFED.bit.DBFED = 50; // FED = 20 TBCLKs || 50*10 = 500 ns delay
    EPwm1Regs.DBRED.bit.DBRED = 50; // RED = 20 TBCLKs || 50*10 = 500 ns delay

}

void init_GPIO(void){
    EALLOW;
    // EPWM SYNCOUT signal
    GpioCtrlRegs.GPAPUD.bit.GPIO6 = 0; // pull up enabled
    GpioCtrlRegs.GPAGMUX1.bit.GPIO6 = 0; // configured mux peripheral group
    GpioCtrlRegs.GPAMUX1.bit.GPIO6 = 3; // configured mux peripheral
    GpioCtrlRegs.GPADIR.bit.GPIO6 = 1; // configured output of SYNCOUT

    // EPWM1A output from GPIO0
    GpioCtrlRegs.GPAPUD.bit.GPIO0 = 0; // pull up enabled
    GpioCtrlRegs.GPAGMUX1.bit.GPIO0 = 0; // configured mux peripheral group
    GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 1; // configured mux peripheral
    GpioCtrlRegs.GPADIR.bit.GPIO0 = 1; // configured output of EPWM1A

    // EPWM1B output from GPIO1
    GpioCtrlRegs.GPAPUD.bit.GPIO1 = 0; // pull up enabled
    GpioCtrlRegs.GPAGMUX1.bit.GPIO1 = 0; // configured mux peripheral group
    GpioCtrlRegs.GPAMUX1.bit.GPIO1 = 1; // configured mux peripheral
    GpioCtrlRegs.GPADIR.bit.GPIO1 = 1; // configured output of EPWM1A

    EDIS;
}
void main(void)
{
    Device_init();

    init_GPIO();

    ConfigEPwm1();

    while(1);
}

Jahangeer、

我很高兴听到您有输出。 是的、您所描述的是正确的。 将 GPIO6连接到从板上的 GPIO、并使用输入 x-bar 将该 GPIO 路由到 INPUT5。  

如果您对此还有其他疑问、请打开一个有关新问题的新 e2e 主题。

(下面是 TMS320F2837xD 器件 TRM 的图表)  

此致、

Ryan Ma