Microchip Technology dsPIC33 series - Page 78

dsPIC33/PIC24 Family Reference Manual
DS70005340A-page 78  2018 Microchip Technology Inc.
7.2 Transmit Event FIFO Code Example
A code example to save the transmitted messages using TEF is shown in Example 7-1.
Example 7-1: Using the Transmit Event FIFO Code
#include <xc.h>
/* This code example demonstrates a method to configure the CAN FD module to save the transmitted
messages in the TEF. This example uses CAN1, FIFO1 and TEF */
/* Include fuse configuration code here. */
#define MAX_WORDS 100
unsigned
int __attribute__((aligned(4)))CanTxBuffer[MAX_WORDS]; //message buffer to be written
unsigned int * currentMessageBuffer; //
Points to message buffer to be read
/*data structure to implement a CANFD message buffer. */
/* CANFD Message Time Stamp */
typedef unsigned long CANFD_MSG_TIMESTAMP;
/* CAN TX Message Object Control*/
typedef struct _CANFD_TX_MSGOBJ_CTRL {
unsigned DLC:4;
unsigned IDE:1;
unsigned RTR:1;
unsigned BRS:1;
unsigned FDF:1;
unsigned ESI:1;
unsigned SEQ:7;
unsigned unimplemented1:16;
} CANFD_TX_MSGOBJ_CTRL;
/* CANFD TX Message ID*/
typedef struct _CANFD_MSGOBJ_ID {
unsigned SID:11;
unsigned long EID:18;
unsigned SID11:1;
unsigned unimplemented1:2;
} CANFD_MSGOBJ_ID;
/* CAN TX Message Object*/
typedef union _CANFD_TX_MSGOBJ {
struct {
CANFD_MSGOBJ_ID id;
CANFD_TX_MSGOBJ_CTRL ctrl;
CANFD_MSG_TIMESTAMP timeStamp;
} bF;
unsigned int word[4];
unsigned char byte[8];
} CANFD_TX_MSGOBJ;
/* CANFD TEF Message Object */
typedef union _CAN_TEF_MSGOBJ {
struct {
CANFD_MSGOBJ_ID id;
CANFD_TX_MSGOBJ_CTRL ctrl;
CANFD_MSG_TIMESTAMP timeStamp;
} bF;
unsigned int word[4];
} CANFD_TEF_MSGOBJ;