[参考译文] TMS320F2800137：F2800137问题

首先：在 TMS320F2800137LAUNCHXL 开发板上运行 cmpss _  ex1_asynch  演示、按照下图中的提示接地或将 ADCINA2连接到3.3V 电压。 PWM7B (GPIO13)没有 PWM 信号输出。 我可以问什么以及如何实现此演示功能吗？

尊敬的 Yong：

在本例中、为了输出 ePWM 输出、您需要配置 ePWM 输出引脚。 替换为以下代码。

请告诉我、这是否可以解决该问题：

//
//
// EPWM7_A - GPIO Settings
//
#define GPIO_PIN_EPWM7_A 28
#define myEPWM7_EPWMA_GPIO 28
#define myEPWM7_EPWMA_PIN_CONFIG GPIO_28_EPWM7_A
//
// EPWM7_B - GPIO Settings
//
#define GPIO_PIN_EPWM7_B 29
#define myEPWM7_EPWMB_GPIO 29
#define myEPWM7_EPWMB_PIN_CONFIG GPIO_29_EPWM7_B

GPIO_setPinConfig(myEPWM7_EPWMA_PIN_CONFIG);
// AGPIO -> GPIO mode selected
GPIO_setAnalogMode(28, GPIO_ANALOG_DISABLED);
GPIO_setPadConfig(myEPWM7_EPWMA_GPIO, GPIO_PIN_TYPE_STD);
GPIO_setQualificationMode(myEPWM7_EPWMA_GPIO, GPIO_QUAL_SYNC);

GPIO_setPinConfig(myEPWM7_EPWMB_PIN_CONFIG);
GPIO_setPadConfig(myEPWM7_EPWMB_GPIO, GPIO_PIN_TYPE_STD);
GPIO_setQualificationMode(myEPWM7_EPWMB_GPIO, GPIO_QUAL_SYNC);

我将就此提交一个 JIRA 请求单、因为应该已经配置好了该请求单、对于产生的任何混淆深表歉意、感谢您提请我们注意！

此致！

马瑞安

//#############################################################################
//
// FILE:   cmpss_ex1_asynch.c
//
// TITLE:  CMPSS Asynchronous Trip
//
//! \addtogroup driver_example_list
//! <h1> CMPSS Asynchronous Trip </h1>
//!
//! This example enables the CMPSS1 COMPH comparator and feeds the asynchronous
//! CTRIPOUTH signal to the GPIO4/OUTPUTXBAR3 pin and CTRIPH to GPIO13/EPWM7B.
//!
//! CMPSS is configured to generate trip signals to trip the EPWM signals.
//! CMPIN1P is used to give positive input and internal DAC is configured 
//! to provide the negative input. Internal DAC is configured to provide a
//! signal at VDD/2. An EPWM signal is generated at GPIO13 and is configured
//! to be tripped by CTRIPOUTH.
//!
//! When a low input(VSS) is provided to CMPIN1P,
//!     - Trip signal(GPIO4) output is low
//!     - PWM7B(GPIO13) gives a PWM signal
//!
//! When a high input(higher than VDD/2) is provided to CMPIN1P,
//!     - Trip signal(GPIO4) output turns high
//!     - PWM7B(GPIO13) gets tripped and outputs as high
//!
//! \b External \b Connections \n
//!  - Give input on CMPIN1P (The pin is shared with ADCINA2)
//!  - Outputs can be observed on GPIO4 and GPIO13 using an oscilloscope
//!
//! \b Watch \b Variables \n
//!  - None
//!
//
//#############################################################################
//
//
// $Copyright:
// Copyright (C) 2023 Texas Instruments Incorporated - http://www.ti.com/
//
// Redistribution and use in source and binary forms, with or without 
// modification, are permitted provided that the following conditions 
// are met:
// 
//   Redistributions of source code must retain the above copyright 
//   notice, this list of conditions and the following disclaimer.
// 
//   Redistributions in binary form must reproduce the above copyright
//   notice, this list of conditions and the following disclaimer in the 
//   documentation and/or other materials provided with the   
//   distribution.
// 
//   Neither the name of Texas Instruments Incorporated nor the names of
//   its contributors may be used to endorse or promote products derived
//   from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// $
//#############################################################################

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

//
// Function Prototypes
//
void initEPWM(void);

//
// Main
//
void main(void)
{
    //
    // Initialize device clock and peripherals
    //
    Device_init();

    //
    // Disable pin locks and enable internal pullups.
    //
    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();

    //
    // Set up ePWM7 to take CTRIPH as TRIP4 for its DC trip input
    //
    initEPWM();

    //
    // Board Initialization
    // - Configure GPIO4 to output CTRIPOUT1H (routed through XBAROUTPUT3)
    // - Setup the Output X-BAR to output CTRIPOUTH on OUTPUTXBAR3
    // - Configure the high comparator of CMPSS1
    // - Enable CMPSS and configure the negative input signal to come from
    //   the DAC
    // - Use VDDA as the reference for the DAC and set DAC value to midpoint for
    //   arbitrary reference.
    // - Configure the output signals. Both CTRIPH and CTRIPOUTH will be fed by
    //   the asynchronous comparator output.
    //
    Board_init();
    GPIO_setAnalogMode(13U, GPIO_ANALOG_DISABLED) // Fix needed for example to work properly

    //
    // Configure GPIO13 to output CTRIPH (routed through ePWM TRIP4 and ePWM7)
    //
    GPIO_setPinConfig(GPIO_13_EPWM7_B);

    //
    // Enable Global Interrupt (INTM) and realtime interrupt (DBGM)
    //
    EINT;
    ERTM;

    //
    // Loop indefinitely
    //
    while(1)
    {
        //
        // Trip flag is set when CTRIP signal is asserted
        //
        if((EPWM_getTripZoneFlagStatus(EPWM7_BASE) &
            EPWM_TZ_FLAG_OST) != 0U)
        {
            //
            // Wait for comparator CTRIP to de-assert
            //
            while((CMPSS_getStatus(CMPSS1_BASE) & CMPSS_STS_HI_FILTOUT) != 0U)
            {
                ;
            }

            //
            // Clear trip flags
            //
            EPWM_clearTripZoneFlag(EPWM7_BASE, EPWM_TZ_INTERRUPT |
                                   EPWM_TZ_FLAG_OST);
        }
    }
}

//
// initEPWM - Function to configure ePWM7 and the ePWM X-BAR to take CTRIPH as
//            the DC trip input
//
void initEPWM(void)
{
    //
    // Disable the ePWM time base clock before configuring the module
    //
    SysCtl_disablePeripheral(SYSCTL_PERIPH_CLK_TBCLKSYNC);

    //
    // Set the time base clock prescalers to /1
    //
    EPWM_setClockPrescaler(EPWM7_BASE, EPWM_CLOCK_DIVIDER_1,
                           EPWM_HSCLOCK_DIVIDER_1);

    //
    // Initializing dummy values for ePWM counter and period
    //
    EPWM_setTimeBaseCounter(EPWM7_BASE, 0);
    EPWM_setTimeBasePeriod(EPWM7_BASE, 0xFFFF);

    //
    // Set-up compare
    //
    EPWM_setCounterCompareValue(EPWM7_BASE, EPWM_COUNTER_COMPARE_B, 0x8000);

    //
    // Set actions
    //
    EPWM_setActionQualifierAction(EPWM7_BASE,
                                  EPWM_AQ_OUTPUT_B,
                                  EPWM_AQ_OUTPUT_HIGH,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPB);

    EPWM_setActionQualifierAction(EPWM7_BASE,
                                  EPWM_AQ_OUTPUT_B,
                                  EPWM_AQ_OUTPUT_LOW,
                                  EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);

    //
    // Configure ePWM7B to output high on TZB TRIP

    //
    EPWM_setTripZoneAction(EPWM7_BASE, EPWM_TZ_ACTION_EVENT_TZB,
                           EPWM_TZ_ACTION_HIGH);

    //
    // Trigger event when DCBH is high
    //
    EPWM_setTripZoneDigitalCompareEventCondition(EPWM7_BASE,
                                                 EPWM_TZ_DC_OUTPUT_B1,
                                                 EPWM_TZ_EVENT_DCXH_HIGH);

    //
    // Configure DCBH to use TRIP4 as an input
    //
    EPWM_enableDigitalCompareTripCombinationInput(EPWM7_BASE,
                                                  EPWM_DC_COMBINATIONAL_TRIPIN4,
                                                  EPWM_DC_TYPE_DCBH);

    //
    // Enable DCB as OST
    //
    EPWM_enableTripZoneSignals(EPWM7_BASE, EPWM_TZ_SIGNAL_DCBEVT1);

    //
    // Configure the DCB path to be unfiltered and asynchronous
    //
    EPWM_setDigitalCompareEventSource(EPWM7_BASE,
                                      EPWM_DC_MODULE_B,
                                      EPWM_DC_EVENT_1,
                                      EPWM_DC_EVENT_SOURCE_ORIG_SIGNAL);

    //
    // Sync the ePWM time base clock
    //
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_TBCLKSYNC);

    //
    // Configure TRIP4 to be CTRIP1H using the ePWM X-BAR
    //
    XBAR_setEPWMMuxConfig(XBAR_TRIP4, XBAR_EPWM_MUX00_CMPSS1_CTRIPH);
    XBAR_enableEPWMMux(XBAR_TRIP4, XBAR_MUX00);


    //
    // Clear trip flags
    //
    EPWM_clearTripZoneFlag(EPWM7_BASE, EPWM_TZ_INTERRUPT |
                           EPWM_TZ_FLAG_OST);

    //
    // Put the time base counter into up-count mode
    //
    EPWM_setTimeBaseCounterMode(EPWM7_BASE, EPWM_COUNTER_MODE_UP);
}

谢谢你，Hadi！

使用 GPIO_setAnalogMode (13U、GPIO_analog_disabled) 实施此实验；

但是、Ryan 发送给我的代码仍然没有实现示波器的显示效果。  我想知道是否有必要重新配置 CMPSS 和 Xbar 模块

勇

尊敬的 Yong：

您能否尝试从现有的示例开始、重新导入该示例并添加  GPIO_setAnalogMode (13U、GPIO_analog_disabled)；行。

这样示例就可以按预期工作。

此致！

马瑞安

尊敬的 Yong：

感谢您的澄清、我将参考我们的示例并添加 Set analogemode driverlib 函数来更新我的答复。

完成此操作后、您是否可以将该主题标记为已解决？

谢谢！