[参考译文] TMS320F280049C：在与 EXTSYNCIN2同步的 APWM 模式下使用 ECAP 的问题：与 EXTSYNCIN2同步不起作用

尊敬的玉智：

我提供了一个将 eCAP4同步至 EXTSYNCIN2的基本示例。 您提供的代码很难看到可能存在的故障。  

我使用了 ePWM ISR 发出了 GPIO 切换信号、即 EXTSYNCIN2、我使用它来同步 eCAP4。

以下示波器屏幕截图显示了以下

黄色：EXTSYNCIN2的 GPIO 切换

蓝色：eCAP4输出

紫色：eCAP2输出(不同步)

附加的文件是测试用例：

C 文件：

// Included Files
//
#include "driverlib.h"
#include "device.h"
#include "board.h"
//
// Main
//
void main(void)
{
    //
    // Initialize device clock and peripherals
    //
    Device_init();

    //
    // Disable pin locks and enable internal pull ups.
    //
    Device_initGPIO();

    //
    // Initialize PIE and clear PIE registers. Disables CPU interrupts.
    //
    Interrupt_initModule();

    //
    // Initialize the PIE vector table with pointers to the shell Interrupt
    // Service Routines (ISR).
    //
    Interrupt_initVectorTable();


    //
    // Board initialization
    // Select eCAP1OUT on MUX 0. Make GPIO5 as eCAP1OUT for PWM output
    // Select eCAP2OUT on MUX 2. Make GPIO6 as eCAP2OUT for PWM output
    // Configure eCAP1 in APWM mode with defined period and duty values
    // Polarity as low and configure SYNCOUT at CTR=PRD
    //
    EALLOW;
    Board_init();
    EPWM_setInterruptSource(myEPWM0_BASE, EPWM_INT_TBCTR_ZERO);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_TBCLKSYNC);
    //
    // Enable Global Interrupt (INTM) and realtime interrupt (DBGM)
    //
    EINT;
    ERTM;

    while(1)
    {
        
    }
}


void INT_myEPWM0_ISR(void){
    // Toggle GPIO
    GPIO_writePin(myGPIO0, 1);

    //
    // Clear INT flag for this timer
    //
    EPWM_clearEventTriggerInterruptFlag(myEPWM0_BASE);
    //
    // Acknowledge interrupt group
    //
    Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP3);
    GPIO_writePin(myGPIO0, 0);
    return;
}
//
// End of File
//

SysConfig：

/**
 * Import the modules used in this configuration.
 */
const ecap             = scripting.addModule("/driverlib/ecap.js", {}, false);
const ecap1            = ecap.addInstance();
const ecap2            = ecap.addInstance();
const epwm             = scripting.addModule("/driverlib/epwm.js", {}, false);
const epwm1            = epwm.addInstance();
const gpio             = scripting.addModule("/driverlib/gpio.js", {}, false);
const gpio1            = gpio.addInstance();
const inputxbar_input  = scripting.addModule("/driverlib/inputxbar_input.js", {}, false);
const inputxbar_input1 = inputxbar_input.addInstance();
const outputxbar       = scripting.addModule("/driverlib/outputxbar.js", {}, false);
const outputxbar1      = outputxbar.addInstance();
const outputxbar2      = outputxbar.addInstance();
const sync             = scripting.addModule("/driverlib/sync.js");

/**
 * Write custom configuration values to the imported modules.
 */
ecap1.$name        = "myECAP0";
ecap1.ecapMode     = "APWM";
ecap1.syncOutMode  = "ECAP_SYNC_OUT_COUNTER_PRD";
ecap1.apwmPolarity = "ECAP_APWM_ACTIVE_LOW";
ecap1.apwmPeriod   = 10000;
ecap1.apwmCompare  = 5000;

ecap2.$name             = "myECAP1";
ecap2.ecapMode          = "APWM";
ecap2.enableLoadCounter = true;
ecap2.apwmPeriod        = 10000;
ecap2.apwmCompare       = 5000;
ecap2.loadCounter       = true;
ecap2.syncOutMode       = "ECAP_SYNC_OUT_DISABLED";
ecap2.ecapBase          = "ECAP4_BASE";

epwm1.$name                                                    = "myEPWM0";
epwm1.epwmTimebase_counterMode                                 = "EPWM_COUNTER_MODE_UP";
epwm1.epwmEventTrigger_enableInterrupt                         = true;
epwm1.epwmEventTrigger_registerInterrupts                      = true;
epwm1.epwmCounterCompare_cmpB                                  = 1;
epwm1.epwmActionQualifier_EPWM_AQ_OUTPUT_A_ON_TIMEBASE_ZERO    = "EPWM_AQ_OUTPUT_HIGH";
epwm1.epwmActionQualifier_EPWM_AQ_OUTPUT_A_ON_TIMEBASE_UP_CMPA = "EPWM_AQ_OUTPUT_LOW";
epwm1.epwmCounterCompare_cmpA                                  = 100;
epwm1.epwmEventTrigger_interruptSource                         = "EPWM_INT_TBCTR_ZERO";
epwm1.epwmEventTrigger_interruptEventCount                     = "15";
epwm1.epwmTimebase_period                                      = 50000;
epwm1.epwmTimebase_counterValue                                = 1;
epwm1.epwmInt.enableInterrupt                                  = true;

gpio1.$name             = "myGPIO0";
gpio1.writeInitialValue = true;
gpio1.direction         = "GPIO_DIR_MODE_OUT";
gpio1.gpioPin.$assign   = "GPIO14";

inputxbar_input1.$name          = "myINPUTXBARINPUT0";
inputxbar_input1.inputxbarInput = "XBAR_INPUT6";
inputxbar_input1.inputxbarGpio  = "GPIO14";

outputxbar1.$name                            = "myOUTPUTXBAR0";
outputxbar1.mux0Config                       = "XBAR_OUT_MUX00_ECAP1_OUT";
outputxbar1.useSourceSelect                  = true;
outputxbar1.sourceSignals                    = ["ECAP4_OUT"];
outputxbar1.outputxbar.$assign               = "OUTPUTXBAR8";
outputxbar1.outputxbar.outputxbarPin.$assign = "GPIO17";

outputxbar2.$name                            = "myOUTPUTXBAR1";
outputxbar2.mux2Config                       = "XBAR_OUT_MUX02_ECAP2_OUT";
outputxbar2.useSourceSelect                  = true;
outputxbar2.sourceSignals                    = ["ECAP1_OUT"];
outputxbar2.outputxbar.$assign               = "OUTPUTXBAR4";
outputxbar2.outputxbar.outputxbarPin.$assign = "GPIO15";

sync.ecap1SyncInSource = "SYSCTL_SYNC_IN_SRC_EPWM7SYNCOUT";
sync.ecap4SyncInSource = "SYSCTL_SYNC_IN_SRC_EXTSYNCIN2";

/**
 * Pinmux solution for unlocked pins/peripherals. This ensures that minor changes to the automatic solver in a future
 * version of the tool will not impact the pinmux you originally saw.  These lines can be completely deleted in order to
 * re-solve from scratch.
 */
epwm1.epwm.$suggestSolution           = "EPWM1";
epwm1.epwm.epwm_aPin.$suggestSolution = "GPIO0";
epwm1.epwm.epwm_bPin.$suggestSolution = "GPIO1";

尊敬的玉智：

不客气、可以将此主题标记为已解决吗？

此致！

马瑞安