1.Hardware connection

CAN

This device driver is used to communicate with SK series touch screen and CAN device. Before using this driver, please read this chapter and related technical instructions carefully.

How to establish a connection with a CAN device

1.Hardware connection

connecting cables:

SK series touch screen COM1/COM2		CAN
1	CANL	Pin customization	CANL
4	CANH	Pin customization	CANH
5	GND	Pin customization	GND

2.Software settings

The function of CANBus is realized by calling the script system function

onCanxStart(PortID): start the CAN device

onCanxstop(PortID): close the CAN device

setBitrate (Bitrate , PortID): set the CAN communication rate

onCanxstop( CanID, CanMask, PortID ): set CAN ID filtering

reciveData ( data, Len, PortID, &CanId ): Receive CAN data

sendData ( data, Len, PortID, CanId, CanType ): send CAN data

For details, please refer to "CAN Communication Function"

3.Case

Initialization function, it is recommended to use the initialization function to power on and initialize once

#include "MacroInit.h"

void Macro_main(IN *p)
{
  MarcoInit
  //ToDo

    int com = 1; // 0:COM2 1:COM1
    int baudRate = 10*1000; // baud rate
    int id = 0; // Set filter ID
    int mask = 0; // Set filter mask

    onCanxstop(com); // Close CAN
    setBitrate(baudRate, com); // Set the baud rate
    onCanxStart(com); // Open CAN
    // addFillter(id, mask, com); // Set filtering, enable filtering, CAN filtering rule references the last CAN filtering calculation method
}

Read data function, it is recommended to use the global macro loop to execute

#include "MacroInit.h"

void Macro_main(IN *p)
{
  MarcoInit
  //ToDo

    int com = 1; // 0:COM2 1:COM1
    char buf[8] = {0}; // Receive data cache
    int len = 0; // Receive data length
    int canId = 0; // Receive data ID
    int i = 0;

    len = reciveData(buf, 8, com, &canId); // Receive CAN data

    if(0 < len)
    {
        *((unsigned int *)(&LocalWord[50030])) = canId; // Display receiving CAN ID to LW50030 32-bit integer type
        LocalWord[50032] = len; // Display receiving data length to LW50032 16-bit integer type
        for(i=0; i< 8; ++i) // Display 8 addresses starting from LW50040
        {
            LocalWord[50040+i] = buf[i] & 0xff;
        }
    }
}

Write data function, trigger execution as needed

#include "MacroInit.h"

void Macro_main(IN *p)
{
  MarcoInit
  //ToDo

    int com = 1; // 0:COM2 1:COM1
    char buf[8] = {1, 2, 3, 4, 5, 6, 7, 8}; // Set the send data is 1 2 3 4 5 6 7 8
    int canId = 0x02; // Set the send data ID
    int mondel = 0x0; // Standard frame:0 Extension frame:0x80000000 Remote frame:0x40000000 Remote extension frame:0xC0000000
    int i = 0;

    sendData(buf, 8, mondel, canId, com); // send data
}