mirror of
https://github.com/Seeed-Studio/Seeed_Arduino_CAN.git
synced 2026-07-28 04:06:45 +00:00
113 lines
2.7 KiB
Arduino
113 lines
2.7 KiB
Arduino
/*
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* demo: CAN-BUS Shield, send random id/type/data
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* This code has a little same with linux can-utils 'cangen -mv'
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*
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* Copyright (C) 2020 Seeed Technology Co.,Ltd.
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*/
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#include <SPI.h>
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#define CAN_2515
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// #define CAN_2518FD
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// Set SPI CS Pin according to your hardware
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#if defined(SEEED_WIO_TERMINAL) && defined(CAN_2518FD)
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// For Wio Terminal w/ MCP2518FD RPi Hat：
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// Channel 0 SPI_CS Pin: BCM 8
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// Channel 1 SPI_CS Pin: BCM 7
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// Interupt Pin: BCM25
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const int SPI_CS_PIN = BCM8;
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const int CAN_INT_PIN = BCM25;
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#else
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// For Arduino MCP2515 Hat:
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// the cs pin of the version after v1.1 is default to D9
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// v0.9b and v1.0 is default D10
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const int SPI_CS_PIN = 9;
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const int CAN_INT_PIN = 2;
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#endif
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#ifdef CAN_2518FD
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#include "mcp2518fd_can.h"
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mcp2518fd CAN(SPI_CS_PIN); // Set CS pin
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#define MAX_DATA_SIZE 64
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#endif
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#ifdef CAN_2515
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#include "mcp2515_can.h"
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mcp2515_can CAN(SPI_CS_PIN); // Set CS pin
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#define MAX_DATA_SIZE 8
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#endif
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void setup() {
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SERIAL_PORT_MONITOR.begin(115200);
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while(!SERIAL_PORT_MONITOR){}
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while (CAN_OK != CAN.begin(CAN_500KBPS)) { // init can bus : baudrate = 500k
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SERIAL_PORT_MONITOR.println("CAN init fail, retry...");
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delay(100);
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}
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SERIAL_PORT_MONITOR.println("CAN init ok!");
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randomSeed(millis());
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}
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uint32_t id;
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uint8_t type; // bit0: ext, bit1: rtr
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unsigned len;
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byte cdata[MAX_DATA_SIZE] = {0};
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void loop() {
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type = random(4);
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if (type & 0x1) {
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// total 29 bits
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// Arduino AVR only generate up to 16 bits random number
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id = random(0x1U << 14);
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id |= (uint32_t)random(0x1U << 15) << 14;
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} else {
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id = random(0x1U << 11);
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}
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if (type & 0x2) {
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len = 0;
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// remote frame could also carry data
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// but don't do it.
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// len = random(0, MAX_DATA_SIZE + 1);
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} else {
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len = random(0, MAX_DATA_SIZE + 1);
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}
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int i;
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for (i = 0; i < len; i++) {
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cdata[i] = random(0x100);
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}
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CAN.sendMsgBuf(id, bool(type & 0x1),
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bool(type & 0x2),
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len, cdata);
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char prbuf[32 + MAX_DATA_SIZE * 3];
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int n;
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/* Displayed type:
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*
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* 0x00: standard data frame
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* 0x02: extended data frame
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* 0x30: standard remote frame
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* 0x32: extended remote frame
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*/
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static const byte type2[] = {0x00, 0x02, 0x30, 0x32};
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n = sprintf(prbuf, "TX: [%08lX](%02X) ", (unsigned long)id, type2[type]);
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// n = sprintf(prbuf, "TX: [%08lX](%02X) ", id, type);
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for (i = 0; i < len; i++) {
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n += sprintf(prbuf + n, "%02X ", cdata[i]);
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}
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SERIAL_PORT_MONITOR.println(prbuf);
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unsigned d = random(30);
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SERIAL_PORT_MONITOR.println(d);
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delay(d);
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}
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// END FILE
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