Self-starting method of serial loading of secondary bootloader based on tms320c674x processor

Abstract

The invention relates to a self-starting method based on TMS320C674X processor two-level BootLoader serial loading, under the condition that the strapdown inertial navigation system does not need to be disassembled, while taking into account the advantages of updating and maintaining software programs through serial communication, it can tolerate the process of burning The impact of unexpected interruption on the system. At the same time, after the FLASH programming is completed, the UBL (User BootLoader) secondary BootLoader method is adopted. Instead of the chip itself, the serial programming program replaces the chip to transfer the application program code to SDRAM and directly drive it to run. , so that the system can save the power-on operation process again, and it has certain flexibility and practicability in the actual use process.

Description

technical field [0001] The invention belongs to the technical field of embedded basic software platforms, relates to a strapdown inertial navigation system, in particular to a self-starting method based on a TMS320C674X processor secondary BootLoader serial loading. Background technique [0002] TI's TMS320C674X series high-performance floating-point DSP (Digital Signal Processing) processors have the advantages of low power consumption, rich interfaces, and strong floating-point computing capabilities. As a system CPU, they have been widely used in strapdown inertial navigation systems. The application of TMS320C674X series processors in engineering practice will inevitably involve chip startup and booting. The currently commonly used TMS320C674X processor booting methods mainly include emulator JTAG interface + FLASH loading mode and serial interface + FLASH loading mode. The emulator JTAG interface + FLASH loading method means that the emulator is connected to the JTAG in...

AI Technical Summary

Problems solved by technology

For the emulator JTAG interface + FLASH loading method, since the DSP chip is integrated in the system circuit, the strapdown inertial navigation system needs to be disassembled every time the software program is updated, and then the software program is updated by connecting the chip JTAG interface through the emulator. In a relatively complex navigation system, disassembling or disassembling the SINS is a rather complicated process involving many aspects, so the method of loading the program through the emulator JTAG interface + FLASH obviously has many inconveniences in actual use; For the serial interface + FLASH loading method, after the serial programming program is programmed into the FLASH through the JTAG interface for the first time, subsequent update applications can update the software through the serial interface, and the SINS can no longer be disassembled. Compared with the emulator JTAG interface + FLASH loading method, the operability is significantly improved, but the serial interface + FLASH loading method also has the problem that the operation cannot be interrupted during the serial programming process, such as the system is not allowed to power off during programming, and cannot tolerate programming. Errors and other shortcomings, if the programming fails, you need to re-disassemble the system to connect to the JTAG interface of the emulator to update the serial programming program. At the same time, after the programming is successful, the system needs to be re-powered or reset, and the new application can be loaded before it can run normally. This method loses flexibility in some applications

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