Online upgrade method of second bootloader based on TMS320F28335

Abstract

To avoid the operations of opening embedded device, configuring GPIO pin voltage level, or developing the special upper computer software during the online upgrade process of application program for TMS320F28335, a second bootloader method was proposed. To realize the online upgrade function of application program, TMS320F28335 was configured as Flash boot mode, and the second bootloader was pre-burned. The application program binary file from general serial port upper computer software was stored in the external extended SRAM of TMS320F28335, and was downloaded to on-chip Flash. And then, the system jumps to execute the application program. The experimental results show that this method is effective and feasible, and it has strong universality and reliability.

Keywords

• tms320f28335
• dsp
• second bootloader
• online upgrade
• serial communication