[参考译文] TMS320F280049C：是否有人成功使用 F280049 LaunchPad 进行 CAN 通信？

您好、Hareesh。

我已检查 F280049C LaunchPad：

1. S9处于默认位置、S9引脚1和 S9引脚2连接在一起、引脚4和引脚5连接在一起。

U10引脚1始终为3.3V。

谢谢。

家开市

请确保 R46存在。 位于焊接侧。

user4450126 说：

2. U10引脚1始终处于3.3V 状态。[/报价]

这意味着 CANTX 信号没有到达收发器(首先假设它在 MCU 引脚边界处正确生成)。 请仔细检查 GPIO 映射。

是、已安装 R46。

我检查了 F280049C LaunchPad 原理图、GPIO32/33用于 CAN 通信。

我已在3个不同的 LaunchPad 上测试了该程序、没人能正常工作。

家开市

您好、Hareesh。

我已将更新后的  can_ex4_simple_transfer.c 的内容复制到 F280049中的 can_ex3_external_transfer.c 示例工程。

我已经将 S9设置为 BP 侧、然后设置为 ALT 侧、但无法从 CAN 接收器接收到命令。

更新后的代码如下所示：

//#############################################################################
//
// FILE:   can_ex4_simple_transmit.c
//
// TITLE:   CAN simple External Transmit Example
//
//! \addtogroup driver_example_list
//! <h1> CAN-A External Transmit </h1>
//!
//! This example initializes CAN module A for external communication.
//! CAN-A module is setup to transmit data for "n" number of times,
//! where "n" is the value of TXCOUNT. Another CAN node configured for the
//! same bit-rate is needed to provide the ACK. No interrupts are used.
//!
//! \b Hardware \b Required \n
//!  - A C2000 board with CAN transceiver and another CAN node configured
//!    for the same bit-rate to provide the ACK.
//!
//! \b Watch \b Variables \n
//!  - TXCOUNT - Adjust to set the number of messages to be transmitted
//!  - txMsgCount - A counter for the number of messages sent
//!  - txMsgData - An array with the data being sent
//!
//
//#############################################################################
//
// $Release Date:  $
// $Copyright:
// Copyright (C) 2013-2023 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"

//
// Defines
//
#define TXCOUNT  100000
#define MSG_DATA_LENGTH    8
#define TX_MSG_OBJ_ID      1

//
// Globals
//
volatile unsigned long i;
volatile uint32_t txMsgCount = 0;
uint16_t txMsgData[8];

//
// Main
//
void main(void)
{
    uint16_t tmp;
    //
    // Initialize device clock and peripherals
    //
    Device_init();

    //
    // Initialize GPIO and configure GPIO pins for CANTX/CANRX
    // on module A
    //
    Device_initGPIO();
    GPIO_setPinConfig(DEVICE_GPIO_CFG_CANRXA);
    GPIO_setPinConfig(DEVICE_GPIO_CFG_CANTXA);

    //
    // Initialize the CAN controllers
    //
    CAN_initModule(CANA_BASE);

    //
    // Set up the CAN bus bit rate to 500kHz for each module
    // Refer to the Driver Library User Guide for information on how to set
    // tighter timing control. Additionally, consult the device data sheet
    // for more information about the CAN module clocking.
    //
    CAN_setBitRate(CANA_BASE, DEVICE_SYSCLK_FREQ, 500000, 16);

    //
    // Initialize the transmit message object used for sending CAN messages.
    // Message Object Parameters:
    //      CAN Module: A
    //      Message Object ID Number: 1
    //      Message Identifier: 0x95555555
    //      Message Frame: Extended
    //      Message Type: Transmit
    //      Message ID Mask: 0x0
    //      Message Object Flags: None
    //      Message Data Length: 4 Bytes
    //
    CAN_setupMessageObject(CANA_BASE, TX_MSG_OBJ_ID, 0x95555555,
                           CAN_MSG_FRAME_EXT, CAN_MSG_OBJ_TYPE_TX, 0,
                           CAN_MSG_OBJ_NO_FLAGS, MSG_DATA_LENGTH);

    //
    // Initialize the transmit message object data buffer to be sent
    //
    txMsgData[0] = 0x01;
    txMsgData[1] = 0x23;
    txMsgData[2] = 0x45;
    txMsgData[3] = 0x67;
    txMsgData[4] = 0x89;
    txMsgData[5] = 0xAB;
    txMsgData[6] = 0xCD;
    txMsgData[7] = 0xEF;

    //
    // Start CAN module A operations
    //
    CAN_startModule(CANA_BASE);

    //
    // Transmit messages from CAN-A
    //
    while(1)
    //
    // Comment for infinite transmissions
    //
    //for(i = 0; i < TXCOUNT; i++)
    //
    {
        CAN_sendMessage(CANA_BASE, TX_MSG_OBJ_ID, MSG_DATA_LENGTH, txMsgData);

        //
        // Poll TxOk bit in CAN_ES register to check completion of transmission
        //
        while(((HWREGH(CANA_BASE + CAN_O_ES) & CAN_ES_TXOK)) !=  CAN_ES_TXOK)
        {
        }
        tmp = txMsgData[0];
        txMsgData[0] = txMsgData[1];
        txMsgData[1] = txMsgData[2];
        txMsgData[2] = txMsgData[3];
        txMsgData[3] = txMsgData[4];
        txMsgData[4] = txMsgData[5];
        txMsgData[5] = txMsgData[6];
        txMsgData[6] = txMsgData[7];
        txMsgData[7] = tmp;
    }
    //
    // Stop application
    //
    asm("   ESTOP0");
}

//
// End of File
//

我已经在2个 LaunchPad 板上对其进行了测试。

谢谢。

家开市

Hareesh、

我正在测试 F28004x、如何使用 F2837x 项目？

家开市

将  can_ex4_simple_transmit.c 的内容复制到 can_ex3_external_transfer.c、结果相同、无 CAN 输出。