DSP and FPGA online upgrading method for embedded system

The invention discloses a DSP and FPGA online upgrading method for an embedded system, which is used for solving the technical problem of complex program of an existing online upgrading method. The technical scheme is that DSP or FPGA firmware required to be upgraded is uploaded to a main control board by an upper computer; the main control board executes a corresponding DSP or FPGA online upgrading function; a DSP board is reset after being upgraded online; and a new user program is reloaded and executed. Two programming algorithms are stored in an extended FLASH of a DSP, so that the DSP directly loads the corresponding programming algorithm to an internal RAM from the extended FLASH by utilizing a working mode detection function, and the programming algorithm skips to a program entry point to be executed; meanwhile, the online upgrading problem of the DSP and FPGA firmware of the embedded system is solved; and the programming algorithm is separated from an application, so that the complexity of user applic