TMS570LS1224: CAN Tx pin is always high

/** @file sys_main.c 
*   @brief Application main file
*   @date 11-Dec-2018
*   @version 04.07.01
*
*   This file contains an empty main function,
*   which can be used for the application.
*/

/* 
* Copyright (C) 2009-2018 Texas Instruments Incorporated - 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 
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*  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.
*
*/


/* USER CODE BEGIN (0) */
/* USER CODE END */

/* Include Files */

#include "sys_common.h"

/* USER CODE BEGIN (1) */
#include "can.h"
#include "gio.h"

/* Include ESM header file - types, definitions and function declarations for system driver */
#include "esm.h"

#define  D_SIZE 9
unsigned int i=0;
uint8  tx_data[D_SIZE]  = {'H','E','R','C','U','L','E','S','\0'};
uint8  rx_data[D_SIZE] = {0};
uint32 error = 0;

uint32 checkPackets(uint8 *src_packet,uint8 *dst_packet,uint32 psize);
/* USER CODE END */

/** @fn void main(void)
*   @brief Application main function
*   @note This function is empty by default.
*
*   This function is called after startup.
*   The user can use this function to implement the application.
*/

/* USER CODE BEGIN (2) */
/* USER CODE END */

int main(void)
{
/* USER CODE BEGIN (3) */

    /* initialize can 1 and 2   */
    canInit(); /* can1 -> can2 */
    gioInit();
    gioSetDirection(gioPORTB,0x0F);

   //while(1)

    /* transmit on can1 */
      canTransmit(canREG1, canMESSAGE_BOX1, tx_data);
      for(i=0;i<=65000;i++);

    /*... wait until message receive on can2 */
//    while(!canIsRxMessageArrived(canREG2, canMESSAGE_BOX1)){
//        canGetData(canREG2, canMESSAGE_BOX1, rx_data);  /* receive on can2  */
//        gioSetBit(gioPORTB,2,1);
//    }
//
//
//    /* check received data patterns */
//    error = checkPackets(&tx_data[0],&rx_data[0],D_SIZE);
//    if(error!=0){
//        gioSetBit(gioPORTB,1,1);
//    }
//
//    /* ... run forever */
      while(1);

/* USER CODE END */

    return 0;
}


/* USER CODE BEGIN (4) */
/** @fn checkPackets(uint8 *src_packet,uint8 *dst_packet,uint32 psize)
*   @brief check two buffers and report error
*
*/
uint32 checkPackets(uint8 *src_packet,uint8 *dst_packet,uint32 psize)
{
   uint32 err=0;
   uint32 cnt=psize;

   while(cnt--)
   {
     if((*src_packet++) != (*dst_packet++))
     {
        err++;           /*  data error  */
     }
   }
   return (err);
}

/* USER CODE BEGIN (4) */
void gioNotification(gioPORT_t *port, uint32 bit){
    return;
}

void esmGroup1Notificatoin(int bit){
    return;
}

void esmGroup2Notificatoin(int bit){
    return;
}
void canErrorNotification(canBASE_t *node, uint32 notification){
    return;
}
void canMessageNotification(canBASE_t *node, uint32 messageBox){
    return;
}
/* USER CODE END */