Bus fault injection system based on DSP and FPGA

Abstract

The invention discloses a bus fault injection system based on DSP and FPGA. The system comprises a DSP main processor, an FPGA, a principal computer, an Ethernet interface module, a DA module, an RS422 interface module, an RS485 interface module, a relay network, a resistance network and a storage module; the required fault mode is configured through a serial connection in a bus system, the RS422 / RS485 interface module is used for receiving the serial signals of the bus, the serial signals are transformed into parallel signals by FPGA, after the signals are processed by DSP, and fault injection signals are outputted by the DA module and the relay network controlled by FPGA. According to the bus fault injection system, the hardware fault injection is adopted, the fault injection functions of a physical layer, an electric gas layer and a protocol layer can be achieved, so that faults occurred in the actual running process of the hardware are simulated more real, and various faults are added in real time in the normal communications of the bus equipment.

Description

technical field [0001] The invention relates to fault injection technology, in particular to a bus fault injection system based on DSP and FPGA. Background technique [0002] In recent years, RS-422 and RS-485 buses have been widely used because of their high real-time and high flexibility, but in practical applications, to ensure the high reliability of the bus system, bus testing is essential. [0003] Most of the existing test methods adopt the forward test mode to test the output response to the input stimulus; even if some existing test methods adopt fault injection, they only perform fault simulation at the physical level and protocol level. Inject short circuit, open circuit, series / parallel impedance, signal replacement, signal delay and other digital part faults, and the fault injection coverage of the analog part of the signal is not comprehensive, and the actual bus operation will face various states and environmental changes . Contents of the invention [000...

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Problems solved by technology

[0003] Most of the existing test methods adopt the forward test mode to test the output response to the input stimulus; even if some existing test methods adopt fault injection, they only perform fault simulation at the physical level and protocol level. Inject short circuit, open circuit, series / parallel impedance, signal replacement, signal delay and other digital part faults, and the fault injection coverage of the analog part of the signal is not comprehensive, and the actual bus operation will face various states and environmental changes

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