M5Dial & CAN using PlatformIO

[samarkh]

Has anyone got the m5Stack dial to work with the CAN (Controller Area Network) Unit SKU: U085 using PlatformIO?

I have got all the examples to compile OK but now I want to connect to the CAN unit I get errors.

Yours Simon M.

[felmue]

Hello @samarkh

which examples have you tried? Maybe this example code can help?

Thanks
Felix

[samarkh]

The solutions I found worked are
For the M5Dial
Platform.ini :-

; PlatformIO Project Configuration File
;
; Build options: build flags, source filter
; Upload options: custom upload port, speed and extra flags
; Library options: dependencies, extra library storages
; Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html

[env:m5stack-stamps3]
platform = espressif32
board = m5stack-stamps3
framework = arduino
lib_deps =
m5stack/M5Dial@^1.0.2
m5stack/M5Unified@^0.1.11
m5stack/M5GFX@^0.1.11
platform_packages = framework-arduinoespressif32@https://github.com/espressif/arduino-esp32/archive/refs/tags/2.0.14.zip
upload_speed = 1500000
monitor_speed = 115200

Start of code:

/**

• @file encoder.ino
• @author SeanKwok (shaoxiang@m5stack.com)
• @brief M5Dial Encoder Test
• @version 0.2
• @date 2023-10-18
• @Hardwares: M5Dial
• @Platform Version: Arduino M5Stack Board Manager v2.0.7
• @Dependent Library:
• M5GFX: https://github.com/m5stack/M5GFX
• M5Unified: https://github.com/m5stack/M5Unified
  */

#include "M5Dial.h"

void setup()
{
auto cfg = M5.config();
M5Dial.begin(cfg, true, false);
......
.....
.....
etc

and for the M5 Core2
Platformio.ini =
; PlatformIO Project Configuration File
;
; Build options: build flags, source filter
; Upload options: custom upload port, speed and extra flags
; Library options: dependencies, extra library storages
; Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html

[env:m5stack-core2]
platform = espressif32
board = m5stack-core2
framework = arduino
platform_packages =
framework-arduinoespressif32@https://github.com/espressif/arduino-esp32/archive/refs/tags/2.0.14.zip
lib_deps =
m5stack/M5Unified@^0.1.11

upload_speed = 1500000
monitor_speed = 115200

and start of code:

/*

• Minimum code to get a display on the
• M5Stack Core2
• Using PlatformIO and Arduino

*/
#include <Arduino.h>
#include <M5Unified.h>
#include <M5GFX.h>

void setup()
{
M5.begin();
....
etc

and for the M5Stack Core3S

Platformio.ini
; PlatformIO Project Configuration File
;
; Build options: build flags, source filter
; Upload options: custom upload port, speed and extra flags
; Library options: dependencies, extra library storages
; Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html

[env:m5stack-cores3]
platform = espressif32
board = m5stack-cores3
framework = arduino
lib_deps =
tinyu-zhao/BMI270_Sensor@^0.0.1
m5stack/M5CoreS3@^0.0.4
m5stack/M5Unified@^0.1.11
platform_packages =
framework-arduinoespressif32@https://github.com/espressif/arduino-esp32/archive/refs/tags/2.0.14.zip

build_flags =
-DESP32S3
-DBOARD_HAS_PSRAM
upload_speed = 1500000
monitor_speed = 115200

and code start
/*

---

• Copyright (c) 2023 by M5Stack

•              Equipped with M5CoreS3 sample source code
  

• Visit for more information:
• https://docs.m5stack.com/en/core/CoreS3 - Docs
• https://github.com/m5stack/M5CoreS3 - GitHub
• Describe: Hello World
• Date: 2023/5/3

---

*/

#include <Arduino.h>
#include <M5CoreS3.h>

void setup()
{
M5.begin(true, true, false); // Init M5CoreS3.
...
etc

Yours Simon M

[samarkh]

As yet I have only got the M5Stack ATOMIC CANBus Base and CANBus Unit to work with the following code using Atom Lite & Atom Matrix :-

#include "M5Atom.h"
#include <ESP32CAN.h>
#include <CAN_config.h>

#define CAN_BASE // Remove to use external CAN bus via Grove cable
//#define CAN_RECIEVER // Remove to make sender

#define CAN_MSG_ID 0x001

CAN_device_t CAN_cfg; // CAN Config.
unsigned long previousMillis = 0; // will store last time a CAN Message was sent // send. 将存储上次发送CAN消息的时间。
const int interval = 80; // interval at which send CAN Messages (milliseconds).

const int rx_queue_size = 10; // Receive Queue size.
int LedNumberCount = 0;
int waitCANData = 0;

uint8_t msgcnt = 0;

void setup()
{
M5.begin(true, true, true);
Serial.println("Atom Install OK....");
M5.dis.fillpix(CRGB(100, 0, 0)); //Fill the LED Matrix RED
delay(2000);

#ifdef CAN_BASE // CAN base is used
//default
CAN_cfg.tx_pin_id = GPIO_NUM_22;
CAN_cfg.rx_pin_id = GPIO_NUM_19;

#else
// Grove
CAN_cfg.tx_pin_id = GPIO_NUM_26;
CAN_cfg.rx_pin_id = GPIO_NUM_32;
#endif

CAN_cfg.speed = CAN_SPEED_500KBPS;

CAN_cfg.rx_queue  = xQueueCreate(rx_queue_size, sizeof(CAN_frame_t));

ESP32Can.CANInit();
Serial.println("CAN Install");
M5.dis.fillpix(CRGB(0, 100, 0));  //Fill the LED Matrix GREEN

M5.dis.fillpix(CRGB(HUE_GREEN)); //Fill the LED Matrix GREEN
#ifdef CAN_RECIEVER
Serial.println("Set as RECIEVER");
#else
Serial.println("Set as SENDER");
#endif
}

void loop()
{
unsigned long currentMillis = millis();

#ifdef CAN_RECIEVER
// recieve CAN Message
CAN_frame_t rx_frame;

if (xQueueReceive(CAN_cfg.rx_queue, &rx_frame, 3 * portTICK_PERIOD_MS) ==  pdTRUE) 
{
    if (rx_frame.FIR.B.FF == CAN_frame_std) 
    {
        Serial.printf("New standard frame");
    } 
    else
    {
        Serial.printf("New extended frame");
    }

    if (rx_frame.FIR.B.RTR == CAN_RTR) 
    {
        Serial.printf(" RTR from 0x%08X, DLC %d\r\n", rx_frame.MsgID, rx_frame.FIR.B.DLC);
    }
    else
    {
        Serial.printf(" from 0x%08X, DLC %d, Data ", rx_frame.MsgID, rx_frame.FIR.B.DLC);
        for (int i = 0; i < rx_frame.FIR.B.DLC; i++) 
        {
            Serial.printf("0x%02X ", rx_frame.data.u8[i]);
        }
        Serial.printf("\n");
        if (rx_frame.data.u8[0] == 0x01) 
        {
            CAN_frame_t tx_frame;
            tx_frame.FIR.B.FF   = CAN_frame_std;
            tx_frame.MsgID      = CAN_MSG_ID;
            tx_frame.FIR.B.DLC  = 8;
            tx_frame.data.u8[0] = 0x02;
            tx_frame.data.u8[1] = rx_frame.data.u8[1];
            tx_frame.data.u8[2] = 0x00;
            tx_frame.data.u8[3] = 0x00;
            tx_frame.data.u8[4] = 0x00;
            tx_frame.data.u8[5] = 0x00;
            tx_frame.data.u8[6] = 0x00;
            tx_frame.data.u8[7] = 0x00;
            ESP32Can.CANWriteFrame(&tx_frame);
        }
    }
}

#else
// Send CAN Message
if (currentMillis - previousMillis >= interval)
{
// ESP32Can.CANInit();
previousMillis = currentMillis;
CAN_frame_t tx_frame;
tx_frame.FIR.B.FF = CAN_frame_std;
tx_frame.MsgID = CAN_MSG_ID;
tx_frame.FIR.B.DLC = 8;
tx_frame.data.u8[0] = 0x01;
tx_frame.data.u8[1] = msgcnt;
tx_frame.data.u8[2] = 0x00;
tx_frame.data.u8[3] = 0x00;
tx_frame.data.u8[4] = 0x00;
tx_frame.data.u8[5] = 0x00;
tx_frame.data.u8[6] = 0x00;
tx_frame.data.u8[7] = 0x00;

    ESP32Can.CANWriteFrame(&tx_frame);
    // ESP32Can.CANStop();
    msgcnt++;
    if (msgcnt > 29) 
    {
        msgcnt = 0;
    }
}

CAN_frame_t rx_frame;

if (xQueueReceive(CAN_cfg.rx_queue, &rx_frame, 3 * portTICK_PERIOD_MS) == pdTRUE) 
{
    if (rx_frame.FIR.B.FF == CAN_frame_std) 
    {
        Serial.printf("New standard frame");
    } 
    else 
    {
        Serial.printf("New extended frame");
    }

    if (rx_frame.FIR.B.RTR == CAN_RTR) 
    {
        Serial.printf(" RTR from 0x%08X, DLC %d\r\n", rx_frame.MsgID,
        rx_frame.FIR.B.DLC);
    } 
    else 
    {
        Serial.printf(" from 0x%08X, DLC %d, Data ", rx_frame.MsgID,
        rx_frame.FIR.B.DLC);
        for (int i = 0; i < rx_frame.FIR.B.DLC; i++) 
        {
            Serial.printf("0x%02X ", rx_frame.data.u8[i]);
        }
        Serial.printf("\n");

        if (rx_frame.data.u8[0] == 0x02) 
        {
                if (rx_frame.data.u8[1] < 25)
            {
                M5.dis.drawpix(rx_frame.data.u8[1], CRGB(100, 0, 0));
            } 
            else if (rx_frame.data.u8[1] > 27) 
            {
                M5.dis.fillpix(CRGB(0, 0, 20));
            }
            waitCANData = 0;
        }
    }
}

#endif
// waitCANData
M5.update();
if (M5.Btn.isPressed())
{
M5.dis.clear();
M5.dis.fillpix(CRGB(0, 100, 0));
esp_restart();
}
delay(10);
}

when I modify it to work with the Core2, it compiles OK but no echo back. what am I missing?

[felmue]

Hello @samarkh

I assume you've adapted the TX and RX GPIOs for M5Core2 accordingly, yes?

Thanks
Felix

[samarkh]

@felmue
I used
/* set CAN pins */
// GROVE connector GPIO pins
CAN_cfg.tx_pin_id = GPIO_NUM_32; // Use this order only
CAN_cfg.rx_pin_id = GPIO_NUM_33;

and I'm able to see activity on the CAN bus using an oscilloscope.

[felmue]

Hello @samarkh

these GPIOs look ok to me. Hmm, not sure why it doesn't work on M5Core2 though. Sorry.

Thanks
Felix

[uberdweeb]

I did get this to work. I'm using this library for the CAN part:

https://github.com/aaknitt/esp32_can/tree/master

Put this code in lib and change the pin designations in esp32_can.cpp:
ESP32CAN attribute((weak)) CAN0(GPIO_NUM_1, GPIO_NUM_2) ;

platformio.ini looks like this:

[env:m5stack-stamps3]
platform = espressif32
board = m5stack-stamps3
framework = arduino

lib_deps =
https://github.com/collin80/can_common
https://github.com/plapointe6/EspMQTTClient
m5stack/M5Dial
m5stack/M5Unified

upload_speed = 1500000
monitor_speed = 115200

Plug it into Port B

Setup code is like:
CAN0.setCANPins(GPIO_NUM_1, GPIO_NUM_2);
USBSerial.println("Set CAN pins...");
CAN0.begin(500000);
USBSerial.println("CAN has started...");
CAN0.watchFor();
CAN0.setCallback(0, theCanDecoder);

If you want full code I can probably clean this all up and publish on Git.