CAN on ESP32 Devkit V1 is Problematic - Many do not work
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- Posts: 4
- Joined: Mon Oct 02, 2023 10:41 pm
Re: CAN on ESP32 Devkit V1 is Problematic - Many do not work
Does anybody have anything? What I think is strange is, I can get the ESP32's that don't work on GM High Speed CAN to talk directly to each other as send/receive... but not on the GM High Speed Can network. My 6-7 original Devkit V1's work find though... just the newer ones don't work.
Last bumped by Transisted on Thu Feb 01, 2024 9:16 pm.
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- Posts: 4
- Joined: Mon Oct 02, 2023 10:41 pm
CAN on ESP32 Devkit V1 is Problematic - Many do not work
Hello, so I've had this 500kbps CAN network doing great for years, mainly using Devkit v1 ESP32's with MCP2551 and a 2.8" SPI TFT, with touch, etc. Working great. I probably have 3-4 of these, and they all work great reading CAN over GM OBD network, sending receiving, no problem. I chose the Devkit v1 because it auto-uploads without pushing the reset button. I think there is a resistor built into the button circuit, on the board. I'm stuck using these Devkit v1's because I made a 30 batch circuit boards for easy connection to the TFT.
Then, recently I ordered more of the Devkit v1's, and 99% do not work on the CAN network.. they simply dont show messages, like it's not connected!
I swap to a Devkit v4, no problems, or any other version ESP32 on my bench, it's just these Devkit V1 that are causing me problems.
I recently ordered 6 more from Amazon, two different vendors with slightly different silkscreen text appearance, but still only one of these 6 work with CAN.
Any ideas? Any help would be great. Below is the base example I use to show all CAN messages. I've even tried adding another 120ohm termination resistor... with no help.
Then, recently I ordered more of the Devkit v1's, and 99% do not work on the CAN network.. they simply dont show messages, like it's not connected!
I swap to a Devkit v4, no problems, or any other version ESP32 on my bench, it's just these Devkit V1 that are causing me problems.
I recently ordered 6 more from Amazon, two different vendors with slightly different silkscreen text appearance, but still only one of these 6 work with CAN.
Any ideas? Any help would be great. Below is the base example I use to show all CAN messages. I've even tried adding another 120ohm termination resistor... with no help.
Code: Select all
#include <ESP32CAN.h>
#include <CAN_config.h>
CAN_device_t CAN_cfg;
char msgString[8];
char dataString[8];
void setup() {
Serial.begin(115200);
Serial.println("ESP32Can_READ_EVERYTHING_v2");
CAN_cfg.speed=CAN_SPEED_500KBPS; // was 1000, need 500
CAN_cfg.tx_pin_id = GPIO_NUM_5;
CAN_cfg.rx_pin_id = GPIO_NUM_4;
CAN_cfg.rx_queue = xQueueCreate(10,sizeof(CAN_frame_t));
//start CAN Module
ESP32Can.CANInit();
delay(2000); // delay to show the filename in serial monitor
}
void loop() {
CAN_frame_t rx_frame; // starts CAN Messages
//receive CAN Data...
if(xQueueReceive(CAN_cfg.rx_queue, &rx_frame, 3*portTICK_PERIOD_MS) == pdTRUE)
{
Serial.print("Message ID: ");
//Serial.println(rx_frame.MsgID);
Serial.print(rx_frame.MsgID,HEX);
Serial.print(", Data: ");
Serial.print(rx_frame.data.u8[0]);
Serial.print(" ");
Serial.print(rx_frame.data.u8[1]);
Serial.print(" ");
Serial.print(rx_frame.data.u8[2]);
Serial.print(" ");
Serial.print(rx_frame.data.u8[3]);
Serial.print(" ");
Serial.print(rx_frame.data.u8[4]);
Serial.print(" ");
Serial.print(rx_frame.data.u8[5]);
Serial.print(" ");
Serial.print(rx_frame.data.u8[6]);
Serial.print(" ");
Serial.print(rx_frame.data.u8[7]);
Serial.print(" ");
Serial.print(rx_frame.data.u8[8]);
Serial.println(" ");
}
else{
Serial.println("Waiting for CAN data...");
}
} // EEND OF RECEIVE CAN MESSAGES LOOP
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