Lightweight trace based measurement systems and methods
An automotive electronics system includes an electronic control unit and a trace adapter. The electronic control unit is configured to receive measurement signals and provide control signals. Additionally, the electronic control unit is configured to generate or provide trace signals by replacing original instructions in a binary image with trace instructions. The trace instructions are functionally equivalent, but trigger providing the trace signals. The trace adapter is coupled to the electronic control unit. The trace adapter is configured to obtain the trace signals from the electronic control unit.
1. An automotive electronics system comprising:
an electronic control unit configured to receive measurement signals and provide control signals based on the measurement signals, wherein the electronic control unit is further configured to obtain original instructions from a main memory, identify instructions of the original instructions related to trace information, and generate trace signals by replacing the identified instructions with trace instructions; and
a trace adapter coupled to the electronic control unit and configured to obtain the trace signals from the electronic control unit and identify a fault based on the trace signals.
2. The system of claim 1 , further comprising a plurality of sensors configured to provide the measurement signals.
3. The system of claim 2 , further comprising a plurality of automotive components configured to operate according to the control signals.
4. The system of claim 3 , wherein the plurality of sensors include a gas flow sensor.
5. The system of claim 3 , wherein the plurality of automotive components includes an engine injection controller.
6. The system of claim 1 , wherein the trace signals include trace information associated with a control algorithm for a single time period.
7. The system of claim 1 , wherein the original instructions include a store instruction.
8. The system of claim 1 , wherein the trace instructions include a store trace instruction, wherein the store trace instruction is functionally equivalent to a store instruction and additionally supplies trace information to the trace adapter.
9. The system of claim 1 , wherein the trace adapter is configured to store trace information from the trace signals.
10. The system of claim 1 , wherein the electronic control unit is configured to identify trace associated instructions in a binary image.
11. The system of claim 10 , wherein the electronic control unit is configured to replace the associated instructions in the binary image with trace instructions prior to execution of the binary image.
12. The system of claim 1 , wherein the trace adapter is integrated with the electronic control unit.
13. A trace system comprising:
a processor core component configured to execute a binary image;
a main memory coupled to the processor core component and configured to maintain and access stored information, the stored information including the binary image and a list of addresses; and
a qualification component configured to identify instructions of the binary image related to trace information according to the list of addresses and replace the identified instructions of the binary image with trace instructions.
14. The system of claim 13 , further comprising a trace adapter coupled to the core component and configured to receive trace information generated by the trace instructions.
15. The system of claim 14 , wherein the trace adapter is configured to analyze the trace information to identify erroneous control signal determinations.
16. The system of claim 14 , wherein a side band signal is generated by the core component on performing one of the trace instructions.
17. The system of claim 13 , further comprising a trace memory, separate from the main memory, the trace memory configured to receive trace information from the core component.
18. A method of operating an automotive electronics system, the method comprising:
obtaining a current instruction of a binary image from a main memory;
identifying the current instruction as a traceable instruction by a qualification component based on whether the current instruction includes trace information;
on identifying the current instruction as a traceable instruction, replacing the identified instruction of the binary image with a trace instruction, wherein the trace instruction is functionally equivalent to the current instruction and provides trace information by the qualification component;
executing the binary image; and
providing trace information associated with the trace instruction.
19. The method of claim 18 , further comprising providing the trace information to a main memory and a trace adapter.
20. The method of claim 18 , wherein identifying the current instruction as a traceable instruction comprises comparing the current instruction with a trace list.