ESP32 Works in LoopbackMode but not NormalMode #42
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Hello,
I think the STBY pin of the transceiver should be LOW for enabling it for receiving and transmitting frame. What is the reference of your transceiver ?
Pierre
… Le 21 juin 2023 à 19:29, Nick Daria ***@***.***> a écrit :
Sketch working in loopback mode just fine, however when I switch to NormalMode, it doesn't get any messages through, and it always starts having Message Send Failures after send # 17. Any thoughts?
Only major change was adding the STBY pin as mapped for the tranciever.
//——————————————————————————————————————————————————————————————————————————————
// ACAN2515 Demo in loopback mode, for ESP32
//——————————————————————————————————————————————————————————————————————————————
#ifndef ARDUINO_ARCH_ESP32
#error "Select an ESP32 board"
#endif
//——————————————————————————————————————————————————————————————————————————————
#include <ACAN2515.h>
//——————————————————————————————————————————————————————————————————————————————
// For using SPI on ESP32, see demo sketch SPI_Multiple_Buses
// Two SPI busses are available in Arduino, HSPI and VSPI.
// By default, Arduino SPI uses VSPI, leaving HSPI unused.
// Default VSPI pins are: SCK=18, MISO=19, MOSI=23.
// You can change the default pin with additional begin arguments
// SPI.begin (MCP2515_SCK, MCP2515_MISO, MCP2515_MOSI)
// CS input of MCP2515 should be connected to a digital output port
// INT output of MCP2515 should be connected to a digital input port, with interrupt capability
// Notes:
// - GPIOs 34 to 39 are GPIs – input only pins. These pins don’t have internal pull-ups or
// pull-down resistors. They can’t be used as outputs.
// - some pins do not support INPUT_PULLUP (see https://www.esp32.com/viewtopic.php?t=439)
// - All GPIOs can be configured as interrupts
// See https://randomnerdtutorials.com/esp32-pinout-reference-gpios/
//——————————————————————————————————————————————————————————————————————————————
static const byte MCP2515_SCK = 8 ; // SCK input of MCP2515
static const byte MCP2515_MOSI = 10 ; // SDI input of MCP2515
static const byte MCP2515_MISO = 9 ; // SDO output of MCP2515
static const byte MCP2515_CS = 2 ; // CS input of MCP2515 (adapt to your design)
static const byte MCP2515_INT = 3 ; // INT output of MCP2515 (adapt to your design)
static const byte MCP2515_RESET = 5 ; // RESET input of MCP2515 (adapt to your design)
static const byte MCP2515_STBY = 4; // STBY input
//——————————————————————————————————————————————————————————————————————————————
// MCP2515 Driver object
//——————————————————————————————————————————————————————————————————————————————
ACAN2515 can (MCP2515_CS, SPI, MCP2515_INT) ;
//——————————————————————————————————————————————————————————————————————————————
// MCP2515 Quartz: adapt to your design
//——————————————————————————————————————————————————————————————————————————————
static const uint32_t QUARTZ_FREQUENCY = 20UL * 1000UL * 1000UL ; // 20 MHz
//——————————————————————————————————————————————————————————————————————————————
// SETUP
//——————————————————————————————————————————————————————————————————————————————
void setup () {
// STBY OFF
pinMode(MCP2515_STBY, OUTPUT);
digitalWrite(MCP2515_STBY, HIGH);
//--- RESET MCP2515
pinMode (MCP2515_RESET, OUTPUT) ;
digitalWrite (MCP2515_RESET, LOW) ;
delay (10) ;
digitalWrite (MCP2515_RESET, HIGH) ;
//--- Start serial
Serial.begin (115200) ;
//--- Wait for serial (blink led at 10 Hz during waiting)
while (!Serial) {
delay (50) ;
}
//--- Begin SPI
SPI.begin (MCP2515_SCK, MCP2515_MISO, MCP2515_MOSI) ;
//--- Configure ACAN2515
Serial.println ("Configure ACAN2515") ;
ACAN2515Settings settings (QUARTZ_FREQUENCY, 500UL * 1000UL) ; // CAN bit rate 500 kb/s
settings.mRequestedMode = ACAN2515Settings::NormalMode ; // Select loopback mode
const uint16_t errorCode = can.begin (settings, [] { can.isr () ; }) ;
if (errorCode == 0) {
Serial.print ("Bit Rate prescaler: ") ;
Serial.println (settings.mBitRatePrescaler) ;
Serial.print ("Propagation Segment: ") ;
Serial.println (settings.mPropagationSegment) ;
Serial.print ("Phase segment 1: ") ;
Serial.println (settings.mPhaseSegment1) ;
Serial.print ("Phase segment 2: ") ;
Serial.println (settings.mPhaseSegment2) ;
Serial.print ("SJW: ") ;
Serial.println (settings.mSJW) ;
Serial.print ("Triple Sampling: ") ;
Serial.println (settings.mTripleSampling ? "yes" : "no") ;
Serial.print ("Actual bit rate: ") ;
Serial.print (settings.actualBitRate ()) ;
Serial.println (" bit/s") ;
Serial.print ("Exact bit rate ? ") ;
Serial.println (settings.exactBitRate () ? "yes" : "no") ;
Serial.print ("Sample point: ") ;
Serial.print (settings.samplePointFromBitStart ()) ;
Serial.println ("%") ;
}else{
Serial.print ("Configuration error 0x") ;
Serial.println (errorCode, HEX) ;
}
}
//----------------------------------------------------------------------------------------------------------------------
static uint32_t gBlinkLedDate = 0 ;
static uint32_t gReceivedFrameCount = 0 ;
static uint32_t gSentFrameCount = 0 ;
//——————————————————————————————————————————————————————————————————————————————
void printFrm(CANMessage frame) {
Serial.print(frame.id, HEX);
Serial.print(", ");
for(uint8_t i = 0; i < 8; i++) {
Serial.print(frame.data[i], HEX);
Serial.print(" ");
}
}
void loop () {
CANMessage frame;
CANMessage frameRx;
frame.id = 0x01;
frame.len = 8;
frame.ext = true;
frame.data64 = 0xFF;
if (gBlinkLedDate < millis ()) {
gBlinkLedDate += 2000 ;
const bool ok = can.tryToSend (frame) ;
if (ok) {
gSentFrameCount += 1 ;
Serial.print ("Sent: ") ;
Serial.println (gSentFrameCount) ;
}else{
Serial.println ("Send failure") ;
}
}
if (can.available ()) {
can.receive (frameRx) ;
printFrm(frameRx);
gReceivedFrameCount ++ ;
Serial.print ("Received: ") ;
Serial.println (gReceivedFrameCount) ;
}
}
//——————————————————————————————————————————————————————————————————————————————
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Pierre, sorry for the late response. I did verify it occurred with STBY both low and high. |
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Sketch working in loopback mode just fine, however when I switch to NormalMode, it doesn't get any messages through, and it always starts having Message Send Failures after send # 17. Any thoughts?
Only major change was adding the STBY pin as mapped for the tranciever.
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