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Add: more comments about CANFD examples

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turmary
2021-01-15 19:15:49 +08:00
parent 6dc4e7d197
commit efad5bb364
5 changed files with 104 additions and 52 deletions
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examples/sendFD/sendFD.ino
+32 -21
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@@ -1,44 +1,55 @@
// demo: CAN-BUS Shield, send data
// loovee@seeed.cc
// demo: sendFD
// show how to send CANFD frames.
// only used with MCP2518FD shield.
#include <SPI.h>
#include "mcp2518fd_can.h"
#define CAN_2518FD
// the cs pin of the version after v1.1 is default to D9
// v0.9b and v1.0 is default D10
#if defined(SEEED_WIO_TERMINAL)
const int SPI_CS_PIN = BCM8;
#else
const int SPI_CS_PIN = 9;
#ifdef CAN_2518FD
mcp2518fd CAN(SPI_CS_PIN); // Set CS pin
#endif
// CANFD could carry data up to 64 bytes
#define MAX_DATA_SIZE 64
mcp2518fd CAN(SPI_CS_PIN); // Set CS pin
void setup() {
SERIAL_PORT_MONITOR.begin(115200);
while(!Serial){};
CAN.setMode(0); // Set FD Mode
while (!SERIAL_PORT_MONITOR) {}
/*
* To compatible with MCP2515 API,
* default mode is CAN_CLASSIC_MODE
* Now set to CANFD mode.
*/
CAN.setMode(CAN_NORMAL_MODE);
while (0 != CAN.begin((byte)CAN_500K_1M)) { // init can bus : baudrate = 500k
SERIAL_PORT_MONITOR.println("CAN init fail, retry...");
delay(100);
}
SERIAL_PORT_MONITOR.println("CAN init ok!");
byte mode = CAN.getMode();
SERIAL_PORT_MONITOR.print("CAN BUS mode = ");
SERIAL_PORT_MONITOR.print("CAN mode = ");
SERIAL_PORT_MONITOR.println(mode);
}
unsigned char stmp[64] = {0};
unsigned char stmp[MAX_DATA_SIZE] = {0};
void loop() {
// send data: id = 0x00, standrad frame, data len = 8, stmp: data buf
stmp[63] = stmp[63] + 1;
if (stmp[63] == 100) {
stmp[63] = 0;
stmp[62] = stmp[62] + 1;
// send data: id = 0x00, standrad frame, data len = 64, stmp: data buf
stmp[MAX_DATA_SIZE - 1] = stmp[MAX_DATA_SIZE - 1] + 1;
if (stmp[MAX_DATA_SIZE - 1] == 100) {
stmp[MAX_DATA_SIZE - 1] = 0;
if (stmp[62] == 100) {
stmp[62] = 0;
stmp[61] = stmp[61] + 1;
stmp[MAX_DATA_SIZE - 2] = stmp[MAX_DATA_SIZE - 2] + 1;
if (stmp[MAX_DATA_SIZE - 2] == 100) {
stmp[MAX_DATA_SIZE - 2] = 0;
stmp[MAX_DATA_SIZE - 3] = stmp[MAX_DATA_SIZE - 3] + 1;
}
}