Does the library support 2x 2518FD chips on same board?

[dalathegreat]

Working with some custom PCBs that have 2x MCP2518 chips on the same SPI

// CAN_FD the first defines
#define MCP2517_SCK 17  // SCK input of MCP2517
#define MCP2517_SDI 23  // SDI input of MCP2517
#define MCP2517_SDO 39  // SDO output of MCP2517
#define MCP2517_CS 21   // CS input of MCP2517 //21 or 22
#define MCP2517_INT 34  // INT output of MCP2517 //34 or 35

// CAN_FD the 2nd defines
#define 2nd_MCP2517_SCK 17  // SCK input of MCP2517
#define 2nd_MCP2517_SDI 23  // SDI input of MCP2517
#define 2nd_MCP2517_SDO 39  // SDO output of MCP2517
#define 2nd_MCP2517_CS 22   // CS input of MCP2517 //21 or 22
#define 2nd_MCP2517_INT 35  // INT output of MCP2517 //34 or 35

Has anyone been able to use this library with two chips at the same time? One of the chips start, but the second fails to start with errorCode 1

[dalathegreat]

Some update on this, I got the boards to initialize properly, but after running for a few seconds I get send_ok going bad, and buffer overflows.

[tomtom0707]

If you do this with an ESP32, pay attention to the selection of the INT pins. Two edge-triggered pins in the same group can cause problems here (in your example 34 and 35).
see: https://docs.espressif.com/projects/esp-chip-errata/en/latest/esp32/03-errata-description/esp32/gpio-edge-interrupts.html

I tested it with ESP32 and two MCP2518.
Test InternalLoopBack, also different settings - ok.
Test Normal20B same settings one CAN bus - ok.
Test Normal20B different settings two CAN buses (only send) - ok.
So I think it works with two MCP2518, but I haven't tested all the variants.
I'm from Germany, I use the loop without speed limit (delay), no errors occur.
General note: If you really want to send quickly on the bus, you have to increase the send buffer (mControllerTransmitFIFOSize).

[pierremolinaro]

Hi, You can use two ACAN2517FDSettings objects : //--- First one ACAN2517FDSettings settings0 (ACAN2517FDSettings::OSC_4MHz10xPLL, 1000 * 1000, DataBitRateFactor::x8) ; settings0.mRequestedMode = ACAN2517FDSettings::InternalLoopBack ; // Select loopback mode uint32_t errorCode[2]={0}; errorCode[0] = can[0]->begin (settings0, [] { can[0]->isr () ; }) ; ... //--- Second one ACAN2517FDSettings settings1 (ACAN2517FDSettings::OSC_4MHz10xPLL, 1000 * 1000, DataBitRateFactor::x8) ; settings1.mRequestedMode = ACAN2517FDSettings::InternalLoopBack ; // Select loopback mode uint32_t errorCode[2]={0}; errorCode[1] = can[1]->begin (settings1, [] { can[1]->isr () ; }) ; settings0 and settings1 can have different settings. Pierre

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Le 23 janv. 2025 à 19:54, tomtom0707 ***@***.***> a écrit : Hi, I would be interested in the topic just as much. See the test program below, which is running. Is this the right way to use the library for 2 x MCP2518FD? What I have to do to give the 2nd controller different settings? I'm not a master of programming... Note, I left out the speed limit ;) `//------------------------------------------------------------------------------ // ACAN2517FD Driver object //------------------------------------------------------------------------------ SPIClass vspi (VSPI) ; // See ESP32 demo sketch: SPI_Multiple_Busses ACAN2517FD can0 (MCP2517_CS0, vspi, MCP2517_INT0) ; ACAN2517FD can1 (MCP2517_CS1, vspi, MCP2517_INT1) ; ACAN2517FD *can[2]; CANFDMessage frame ; uint8_t i; //------------------------------------------------------------------------------ // SETUP //------------------------------------------------------------------------------ void setup () { //--- Start serial Serial.begin (115200) ; while (!Serial) { delay (50) ; } can[0] = &can0; can[1] = &can1; //----------------------------------- Begin SPI vspi.begin (MCP2517_SCK, MCP2517_MISO, MCP2517_MOSI) ; //---------------------- CAN0 ---------------------------------------------------- Serial.print("sizeof (ACAN2517FDSettings): "); Serial.print(sizeof (ACAN2517FDSettings)); Serial.println(" bytes"); Serial.println("Configure CAN0:"); ACAN2517FDSettings settings (ACAN2517FDSettings::OSC_4MHz10xPLL, 1000 * 1000, DataBitRateFactor::x8) ; settings.mRequestedMode = ACAN2517FDSettings::InternalLoopBack ; // Select loopback mode uint32_t errorCode[2]={0}; errorCode[0] = can[0]->begin (settings, [] { can[0]->isr () ; }) ; if (errorCode[0] == 0) { Serial.print ("Bit Rate prescaler: ") ; Serial.println (settings.mBitRatePrescaler) ; Serial.print ("Arbitration Phase segment 1: ") ; Serial.println (settings.mArbitrationPhaseSegment1) ; Serial.print ("Arbitration Phase segment 2: ") ; Serial.println (settings.mArbitrationPhaseSegment2) ; Serial.print ("Arbitration SJW:") ; Serial.println (settings.mArbitrationSJW) ; Serial.print ("Actual Arbitration Bit Rate: ") ; Serial.print (settings.actualArbitrationBitRate ()) ; Serial.println (" bit/s") ; Serial.print ("Exact Arbitration Bit Rate ? ") ; Serial.println (settings.exactArbitrationBitRate () ? "yes" : "no") ; Serial.print ("Arbitration Sample point: ") ; Serial.print (settings.arbitrationSamplePointFromBitStart ()) ; Serial.println ("%") ; }else{ Serial.print ("ConfigCAN0 error 0x") ; Serial.println (errorCode[0], HEX) ; } // ---------------------- CAN1 ---------------------------------------------------- //Config CAN1 - settings ??? errorCode[1] = can[1]->begin (settings, [] { can[1]->isr () ; }) ; if (errorCode[1] == 0) { Serial.print ("Bit Rate prescaler: ") ; Serial.println (settings.mBitRatePrescaler) ; Serial.print ("Arbitration Phase segment 1: ") ; Serial.println (settings.mArbitrationPhaseSegment1) ; Serial.print ("Arbitration Phase segment 2: ") ; Serial.println (settings.mArbitrationPhaseSegment2) ; Serial.print ("Arbitration SJW:") ; Serial.println (settings.mArbitrationSJW) ; Serial.print ("Actual Arbitration Bit Rate: ") ; Serial.print (settings.actualArbitrationBitRate ()) ; Serial.println (" bit/s") ; Serial.print ("Exact Arbitration Bit Rate ? ") ; Serial.println (settings.exactArbitrationBitRate () ? "yes" : "no") ; Serial.print ("Arbitration Sample point: ") ; Serial.print (settings.arbitrationSamplePointFromBitStart ()) ; Serial.println ("%") ; }else{ Serial.print ("ConfigCAN1 error 0x") ; Serial.println (errorCode[1], HEX) ; } Serial.println ("los gehts..."); } //------------------------------------------------------------------------------ // LOOP //------------------------------------------------------------------------------ static uint32_t gReceivedFrameCount[2] = {0}; static uint32_t gSentFrameCount[2] = {0}; static const uint32_t MESSAGE_COUNT = 10000 ; uint8_t stopp[2] = {0}; //------------------------------------------------------------------------------ void loop () { for(i=0;i<2;i++) { if (gSentFrameCount[i] < MESSAGE_COUNT) { const bool ok = can[i]->tryToSend (frame) ; if (ok) { gSentFrameCount[i]++; } } else { if(stopp[i] == 0){ stopp[i] = 1; Serial.print ("CAN"); Serial.print (i); Serial.print (" Sent: ") ; Serial.print (gSentFrameCount[i]) ; Serial.print ("; Received: ") ; Serial.println (gReceivedFrameCount[i]) ; } } } for(i=0;i<2;i++) { if (can[i]->available()) { CANFDMessage frame ; can[i]->receive(frame) ; gReceivedFrameCount[i] ++ ; } } } ` — Reply to this email directly, view it on GitHub <#53 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEWKZVCOVFGNJJTSQO7OJUT2ME3FHAVCNFSM6AAAAABSVP5YDCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMMJQG43TCMZXGE>. You are receiving this because you are subscribed to this thread.