main.c

/******************************************************************************
* File Name:   main.c
*
* Description: This is the source code for the XMC MCU: CAN Receiver example
*              for ModusToolbox. The CAN node 1 is configured to receive a CAN
*              message over the CAN bus. Successful message reception is
*              indicated by toggling the USER LED1. The USER LED2 is updated based
*              on the message received in the CAN frame.
*
* Related Document: See README.md
*
******************************************************************************
*
* Copyright (c) 2022, Infineon Technologies AG
* All rights reserved.
*
* Boost Software License - Version 1.0 - August 17th, 2003
*
* Permission is hereby granted, free of charge, to any person or organization
* obtaining a copy of the software and accompanying documentation covered by
* this license (the "Software") to use, reproduce, display, distribute,
* execute, and transmit the Software, and to prepare derivative works of the
* Software, and to permit third-parties to whom the Software is furnished to
* do so, all subject to the following:
*
* The copyright notices in the Software and this entire statement, including
* the above license grant, this restriction and the following disclaimer,
* must be included in all copies of the Software, in whole or in part, and
* all derivative works of the Software, unless such copies or derivative
* works are solely in the form of machine-executable object code generated by
* a source language processor.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
* SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
* FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*****************************************************************************/

#include "cybsp.h"
#include "cy_utils.h"
#include "cy_retarget_io.h"
#include <stdio.h>

/*******************************************************************************
* Defines
*******************************************************************************/

#if(UC_SERIES == XMC14)
#define IRQ_NUMBER                  CAN0_3_IRQn           /* Interrupt number */
#define CAN_IRQ_HANDLER             CAN0_3_IRQHandler     /* CAN Interrupt Handler */
#endif

#if(UC_FAMILY == XMC4)
#define IRQ_NUMBER                  CAN0_7_IRQn           /* Interrupt number */
#define CAN_IRQ_HANDLER             CAN0_7_IRQHandler     /* CAN Interrupt Handler */
#endif

/* Define macro to enable/disable printing of debug messages */
#define ENABLE_XMC_DEBUG_PRINT              (0)

/*******************************************************************************
* Variables
*******************************************************************************/
/* Variable to indicate that CAN frame is received */
volatile bool frame_received = false;


/*******************************************************************************
* Function Name: CAN_IRQ_HANDLER
********************************************************************************
* Summary:
* This is the interrupt handler function for the CAN node
*
* Parameters:
*  void
*
* Return:
*  void
*
*******************************************************************************/
void CAN_IRQ_HANDLER(void)
{
    /* Receive the message in the CAN_message MO */
    XMC_CAN_MO_Receive(&CAN_NODE_LMO_0);

    /* Toggle LED1 to indicate that the message is received */
    XMC_GPIO_ToggleOutput(CYBSP_USER_LED_PORT, CYBSP_USER_LED_PIN);

    /* Set the frame received flag to true */
    frame_received = true;
}

/*******************************************************************************
* Function Name: main
********************************************************************************
* Summary:
* This is the main function. This function performs
*  - initial setup of device
*  - initialize CAN Node and receive message object
*  - prints the received CAN message in the serial terminal and turns the
*    USER LED2 based on the command received.
*
* Parameters:
*  none
*
* Return:
*  int
*
*******************************************************************************/
int main(void)
{
    cy_rslt_t result;

    #if ENABLE_XMC_DEBUG_PRINT
    /* Assign false to disable printing of debug messages*/
    static volatile bool debug_printf = true;
    #endif

    /* Initialize the device and board peripherals */
    result = cybsp_init();
    if (result != CY_RSLT_SUCCESS)
    {
        CY_ASSERT(0);
    }

    /* Initialize printf retarget */
    cy_retarget_io_init(CYBSP_DEBUG_UART_HW);

    #if ENABLE_XMC_DEBUG_PRINT
    printf("Initialization done\r\n");
    #else
    printf("\r\n*********************************\r\n");
    printf("CAN Receiver Example project\n\r");
    printf("*********************************\r\n");
    #endif

    /* Enable NVIC node */
    NVIC_EnableIRQ(IRQ_NUMBER);

    for(;;)
    {
        /* CAN Frame is received */
        if(frame_received)
        {
            /* Print the received frame in serial terminal */
            #if ENABLE_XMC_DEBUG_PRINT
            if(debug_printf == true)
            {
                printf("Received CAN frame\n\r");
                debug_printf = false;
            }
            #else
            printf("Received CAN frame\n\r");
            printf("Button State: %x\n\r", CAN_NODE_LMO_0.can_data_byte[0]);
            #endif

            #ifdef CYBSP_USER_LED2_PIN
            /* Update USER LED2 based on command received */
            if(CAN_NODE_LMO_0.can_data_byte[0] == 0)
            {
                XMC_GPIO_SetOutputLow(CYBSP_USER_LED2_PORT, CYBSP_USER_LED2_PIN);
            }
            else
            {
                XMC_GPIO_SetOutputHigh(CYBSP_USER_LED2_PORT, CYBSP_USER_LED2_PIN);
            }
            #endif

            /* Reset flag */
            frame_received = false;
        }
    }
}

/* [] END OF FILE */