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SAE J1939 Programming with Arduino – End of Message Acknowledgment Timeout
This post is part of a series about SAE J1939 ECU Programming & Vehicle Bus Simulation with Arduino. In order to test all timeouts during an RTS/CTS session, I used a dedicated Arduino sketch to simulate all the “nasty” features that would trigger a communication breakdown. This method was easier to implement rather than using a full SAE J1939 stack. [...]
SAE J1939 Programming with Arduino – Clear to Send Timeout
This post is part of a series about SAE J1939 ECU Programming & Vehicle Bus Simulation with Arduino. The simplest test for a Clear to Send timeout is accomplished by running the Mega 2560 ECU as the only node in the network.To test this scenario, I run the Mega 2560 at an address of 0x80 (128) and attempt to initiate [...]
SAE J1939 Programming with Arduino – RTS/CTS Session Message Timing
This post is part of a series about SAE J1939 ECU Programming & Vehicle Bus Simulation with Arduino. Note the time stamps from line 3 through line 5 of the screen shot (look at the last four numbers indicating the time in tenth of milliseconds; for instance 352.4 milliseconds in line 3). SAE J1939/21 requires a packet frequency between 50 [...]
SAE J1939 Programming with Arduino - Transport Protocol – RTS/CTS Session (SAE J1939/21)
This post is part of a series about SAE J1939 ECU Programming & Vehicle Bus Simulation with Arduino. Test items include: Basic function Timing controlNaturally, for the RTS/CTS session we will need two SAE J1939 nodes. In my setup that means communication between the Arduino Uno and the Mega 2560 ECUs. [...]
SAE J1939 Programming with Arduino - BAM Session Message Timing
This post is part of a series about SAE J1939 ECU Programming & Vehicle Bus Simulation with Arduino. Looking at the below image, note the time stamps from line 1 through line 4 of the screen shot (look at the last four numbers indicating the time in tenth of milliseconds; for instance 942.4 milliseconds in line 1). SAE J1939/21 requires a [...]
SAE J1939 Programming with Arduino - BAM Session (SAE J1939/21)
This post is part of a series about SAE J1939 ECU Programming & Vehicle Bus Simulation with Arduino. Test items include: Basic function Timing controlThe initial test of the BAM session requires only one ECU, in this case I am using the full protocol running on the Arduino Mega 2560 [...]
SAE J1939 Programming with Arduino - Sending and Receiving Messages
This post is part of a series about SAE J1939 ECU Programming & Vehicle Bus Simulation with Arduino. Proving the capability of the most basic task of sending and receiving regular 8-byte (CAN) messages must be seen as an unnecessary test, since that had already taken place in previous chapters. Things change, however, with the transmission and reception of J1939 [...]
SAE J1939 Programming with Arduino - Claiming Address With Contending Node
This post is part of a series about SAE J1939 ECU Programming & Vehicle Bus Simulation with Arduino. Now let’s have the two nodes compete for their addresses, since they both use the same preferred source address. For that purpose, it is important to consider which node starts up first, and the test results will demonstrate the difference.Test #1: Mega [...]
SAE J1939 Programming with Arduino - Proof of Concept
This post is part of a series about SAE J1939 ECU Programming & Vehicle Bus Simulation with Arduino. Naturally, with the impression that the Arduino hardware is a far cry away from commercially available, industrial solutions, some doubters may challenge even the point that the Arduino software is up to the task of running a full SAE J1939 protocol stack. [...]
SAE J1939 Programming with Arduino - Program Structure
This post is part of a series about SAE J1939 ECU Programming & Vehicle Bus Simulation with Arduino. As with every Arduino application, the initialization of data and the J1939 protocol takes place during the setup() function, while the actual application resides in loop().setup() - The j1939.Init function is mandatory to operate ARD1939. You also need to set the preferred [...]