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About the CAN controller.

https://esp32.com/viewtopic.php?t=380

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Re: About the CAN controller.

Posted: Mon May 22, 2017 2:32 am
by Beck-Sisyphus
Successfully built with thanks!
Merged

Re: About the CAN controller.

Posted: Mon May 22, 2017 1:10 pm
by miles0815
Hi,

i can now build the project. Thanks!

Now i have another issue. I'm using then pins 4 and 5. CAN_init() and CAN_write_frame(&__TX_frame) both return 0, so i think i'm good here. The problem is, that i'm not able to see any signals on pin 5 (using an logic analyser directly connected to TX). Any idea what could be going wrong?

Thanks

Re: About the CAN controller.

Posted: Mon May 22, 2017 2:20 pm
by miles0815
Hi again,

all is working now. It was just a wiring issue.

Thanks again an keep up the great work!

Re: About the CAN controller.

Posted: Tue May 23, 2017 3:12 pm
by Beck-Sisyphus
Things didn't go that well on me.
I've built the PCB with Texas Instrument SN65HVD232, and got the code built, and measured the CAN_H and CAN_L in recessive state of 2.285V so I believe there are no power issues.

Running Rudi's main file, and when I try:

ESPCan configured by this Data:
Node : 0x264
CAN RXD PIN NUM: 4
CAN TXD PIN NUM: 5

the error is attached, and when I switch to:

ESPCan configured by this Data:
Node : 0x264
CAN RXD PIN NUM: 16
CAN TXD PIN NUM: 5

The situation gets worse. Any hits?


Error message:

Code: Select all


Guru Meditation Error of type InstrFetchProhibited occurred on core  0. Exception was unhandled.
Register dump:
PC      : 0xffffffff  PS      : 0x00060430  A0      : 0x800d06f5  A1      : 0x3ffb8880
A2      : 0x00000800  A3      : 0xffffffff  A4      : 0x00060023  A5      : 0x3ffaf79c
A6      : 0x00000000  A7      : 0x00000001  A8      : 0x8010fbbd  A9      : 0x3ffb8830
A10     : 0x4010f9cc  A11     : 0x3f407890  A12     : 0x00000800  A13     : 0x00000000
0x4010f9cc: task_CAN at /Users/Beck/Developer/esp/can_bus_components/main/./main_rubi.c:75

A14     : 0x00000005  A15     : 0x00000000  SAR     : 0x00000004  EXCCAUSE: 0x00000014
EXCVADDR: 0xfffffffc  LBEG    : 0x400014fd  LEND    : 0x4000150d  LCOUNT  : 0xffffffff

Backtrace: 0x7fffffff:0x3ffb8880 0x400d06f5:0x3ffb8950
0x400d06f5: main_task at /Users/Beck/Developer/esp/esp-idf/components/esp32/./cpu_start.c:307


Guru Meditation Error of type IllegalInstruction occurred on core  1. Exception was unhandled.
Register dump:
PC      : 0x401109e8  PS      : 0x00060030  A0      : 0x80110755  A1      : 0x3ffc57f0
0x401109e8: gpio_set_direction at /Users/Beck/Developer/esp/esp-idf/components/driver/./gpio.c:250

A2      : 0x00000005  A3      : 0x00000002  A4      : 0x3ffc5a9c  A5      : 0x00000000
A6      : 0x3ffc5a50  A7      : 0x00060b20  A8      : 0x00000021  A9      : 0x3ffc57e0
A10     : 0x00000001  A11     : 0x00000001  A12     : 0x3ffc5a98  A13     : 0x00000000
A14     : 0x00000000  A15     : 0x00060b23  SAR     : 0x00000000  EXCCAUSE: 0x00000000
EXCVADDR: 0x00000000  LBEG    : 0x00000000  LEND    : 0x00000000  LCOUNT  : 0x00000000

Backtrace: 0x401109e8:0x3ffc57f0 0x40110755:0x3ffc5820 0x4010f9e4:0x3ffc5840
0x401109e8: gpio_set_direction at /Users/Beck/Developer/esp/esp-idf/components/driver/./gpio.c:250

0x40110755: CAN_init at /Users/Beck/Developer/esp/can_bus_components/components/can/./CAN.c:175

0x4010f9e4: task_CAN at /Users/Beck/Developer/esp/can_bus_components/main/./main_rubi.c:89

Re: About the CAN controller.

Posted: Wed May 24, 2017 8:33 pm
by rudi ;-)
@beck

could you manage and have you find the mistake in the code line 75 in the file "main_rubi.c"

Code: Select all

/Users/Beck/Developer/esp/can_bus_components/main/./main_rubi.c:75
best wishes
rudi ;-)

Re: About the CAN controller.

Posted: Wed Jun 14, 2017 10:52 pm
by rudi ;-)
@thomas
revised CAN Demo based on the ESP-IDF Component CAN Driver pack is in the pipe

i must look how a PR is done from a branch... comes to yours ...
in the meantime folks, have a look here too

best wishes
rudi ;-)

Re: About the CAN controller.

Posted: Thu Jun 15, 2017 9:10 pm
by ThomasB
cool 8-)

Re: About the CAN controller.

Posted: Thu Oct 05, 2017 2:58 am
by el_Rey
....

To use the driver in the Arduino environment I rearranged the folder structure a little bit, removed the "cfg" folder including CAN_config.c file and renamed CAN.c to CAN.cpp. It now looks like:

Code: Select all

[folder] library
     [folder] CAN_ESP32
          [file] CAN.cpp
          [file] CAN.h
          [folder] incude
               [file] CAN_config.h
               [file] can_regdef.h

.....

The Arduino ino file looks like:

Code: Select all

#include "CAN.h"

CAN_device_t CAN_cfg = {
  .speed=CAN_SPEED_500KBPS,    // CAN Node baudrade
  .tx_pin_id = GPIO_NUM_5,    // CAN TX pin
  .rx_pin_id = GPIO_NUM_4,    // CAN RX pin
  .rx_queue=NULL,         // FreeRTOS queue for RX frames
};

CAN_frame_t frame;
CAN_frame_t __RX_frame;

long t_old;

void setup() {
  // put your setup code here, to run once:

  Serial.begin(500000);

  //create CAN RX Queue
  CAN_cfg.rx_queue = xQueueCreate(10,sizeof(CAN_frame_t));

   //start CAN Module
  CAN_init();

}

void loop() {
  // put your main code here, to run repeatedly:  

  if ((millis()-t_old)>1000){
    t_old=millis();

    frame.MsgID=0x3ff;
    frame.DLC=8;
    frame.data.u8[0]='C';
    frame.data.u8[1]='A';
    frame.data.u8[2]='N';
    frame.data.u8[3]='E';
    frame.data.u8[4]='S';
    frame.data.u8[5]='P';
    frame.data.u8[6]='3';
    frame.data.u8[7]='2';
    
    CAN_write_frame(&frame);
  }

  if(xQueueReceive(CAN_cfg.rx_queue,&__RX_frame, 3*portTICK_PERIOD_MS)==pdTRUE){
    Serial.print(millis());
    Serial.print("/");
    Serial.print(String(__RX_frame.MsgID,HEX));
    Serial.print((char)__RX_frame.data.u8[0]);
    Serial.print((char)__RX_frame.data.u8[1]);
    Serial.print((char)__RX_frame.data.u8[2]);
    Serial.print((char)__RX_frame.data.u8[3]);
    Serial.print((char)__RX_frame.data.u8[4]);
    Serial.print((char)__RX_frame.data.u8[5]);
    Serial.print((char)__RX_frame.data.u8[6]);
    Serial.println((char)__RX_frame.data.u8[7]);
  }    
  delay(0);
}
....

Hello plexidj, I'm trying to copy what you did in Arduino without any success. If you are still monitoring this thread, could you please share your ino file for the ESP32? Or is it the same sketch you posted for the Arduino? Did you have to modify the CAN driver files any? like change include directive for your directory structure?

Did you get this error at all:
CAN.cpp:58:32: error: invalid conversion from 'uint32_t {aka unsigned int}' to '__CAN_IRQ_t' [-fpermissive]

interrupt = MODULE_CAN->IR.U;

Thanks,
Rey

Re: About the CAN controller.

Posted: Tue Oct 10, 2017 2:53 pm
by DrSegatron
Should I be able to get output on the TX pin without having connected a tranceiver? I can't get anything out of CAN_write_frame();:

Code: Select all

CAN_device_t CAN_cfg =
{
	.speed=CAN_SPEED_125KBPS,		// CAN Node baudrade
	.tx_pin_id = GPIO_NUM_5,		// CAN TX pin
	.rx_pin_id = GPIO_NUM_4,		// CAN RX pin
	.rx_queue=0,					// FreeRTOS queue for RX frames
};

Code: Select all

	CAN_init();

	while (1)
	{
		tx.FIR.B.FF=CAN_frame_std;
		tx.FIR.B.RTR=CAN_no_RTR;
		tx.FIR.B.DLC=8;
		tx.MsgID=CONFIG_ESP_CAN_NODE_ITSELF;
		tx.data.u32[0]=0xaaaaaaaa;
		tx.data.u32[1]=0x55555555;
		CAN_write_frame(&tx);
All I get is a high level on TX and a low level on RX.

Re: About the CAN controller.

Posted: Wed Oct 11, 2017 8:49 am
by _scrat
Hi DrSegatron

If the CAN controller sees a low level at the Rx Pin, it thinks the bus is in the dominant state, thus occupied and doesn't send anything. Furthermore the CAN Controller expects its Tx signal to be looped back by the transceiver. So if you don't have a transceiver connected, try to short the Tx and Rx pin. - worked at my place.

-_scrat
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