Aiming at the inaccessible problem of remote embedded devices update and maintenance, this paper presents a method using general packet radio service （GPRS） to achieve update based on the embedded real-time operatin...Aiming at the inaccessible problem of remote embedded devices update and maintenance, this paper presents a method using general packet radio service （GPRS） to achieve update based on the embedded real-time operating system （RTOS） μC/OS-Ⅱ. It introduces architecture of the system first. And then it uses LPC1768 chip as the central processing unit, SIM900A module for data transmission, and SST25VF016B to store the data. To ensure accuracy of the data transmis- sion, cyclic redundancy code （CRC） is adopted. The software uses fixed bootstrap and mutable update program, and thus the embedded devices can still normally start in case of update failure. Finally, high stability and extensive adaptability of the system are verified by experimental data.展开更多
LWIP is a light-weight TCP/IP protocol stack. Lwipis source-opened and can be transplanted very easily. According to the features of LWIP,this paper presents the application of LWIP in embedded functions by transplant...LWIP is a light-weight TCP/IP protocol stack. Lwipis source-opened and can be transplanted very easily. According to the features of LWIP,this paper presents the application of LWIP in embedded functions by transplanting LWIP intoμC/OS-Ⅱoperating system.展开更多
文摘Aiming at the inaccessible problem of remote embedded devices update and maintenance, this paper presents a method using general packet radio service （GPRS） to achieve update based on the embedded real-time operating system （RTOS） μC/OS-Ⅱ. It introduces architecture of the system first. And then it uses LPC1768 chip as the central processing unit, SIM900A module for data transmission, and SST25VF016B to store the data. To ensure accuracy of the data transmis- sion, cyclic redundancy code （CRC） is adopted. The software uses fixed bootstrap and mutable update program, and thus the embedded devices can still normally start in case of update failure. Finally, high stability and extensive adaptability of the system are verified by experimental data.
基金supported by the Graduates Innovation Foundation of Shandong University of Science and Technology(No.YCB100150).
文摘LWIP is a light-weight TCP/IP protocol stack. Lwipis source-opened and can be transplanted very easily. According to the features of LWIP,this paper presents the application of LWIP in embedded functions by transplanting LWIP intoμC/OS-Ⅱoperating system.
