SimTech SimCom SIM800 Series Application Note

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Contents 1 Upgrade Process..................................................................................6 1.1 Start Upgrade Process...................................................................................6 1.2 Synchronization Word Detection（0xB5）.................................................7 1.3 Send Head In ...

Figure 1: Upgrade process ........................................................................................................6 Figure 2：Waiting for synchronization word ...........................................................................7 Figure 3：Synchronization word detection .................................... ...

Version History Date Version Description of change Author 2013-09-02 V1.00 New version Yanhai.cheng 2013-09-04 V1.01 SIM800 Series Upgrade protocol and picture change Yanhai.cheng 2014-06-30 V1.02 Change Linux Command parameter redefine Yanhai.cheng Scope This manual mainly describes how to use the PC or external MCU to upgrade s ...

1 Upgrade Process This chapter introduces software upgrade process of SIM800 series modules. The picture below illustrates this upgrade process: Every time when module is powered on, it will start from the BOOT ROM. The following picture shows the upgrade process: Figure 1: Upgrade process 1.1 Start Upgrade Process 1) Make sure t ...

1.2 Synchronization Word Detection（0xB5） When the module Bootloader program starts, if it receives the 0xb5 byte synchronization word within 100 ms, it will reply with a 0x5b byte word then the module go into the upgrade mode. Within 100 ms, if the module does not receive 0xb5 synchronization word, the module will enter norma ...

(0x03), 4-bytes data frame length (maximum length is no more than 512 bytes), data fields and 4-bytes data checksum. Checksum calculation method is as following: add all data bytes of the number, the value of last 4 bytes of the number is the checksum. Smart Machine ...

0x5B Sync byte confirm MODULE->PC 0x01/0x81 Send head information PC->MODULE 0x02 Head information confirm MODULE->PC 0x03 Send Upgrade data PC->MODULE 0x04 Upgrade data confirm MODULE->PC ‘P’ Write flash fail MODULE->PC ‘C’ Checksum error MODULE->PC ‘R’ Erasing MODULE->PC ‘E’ Erase error MODULE->PC ‘S’ File s ...

2 Linux Source Code SIMCom offers SIM800 upgrade Linux source code mtkdownload, as well as the binaries compiled by Ubuntu 11.10 64 - bit system. Customer can run it directly under this system, in other Linux systems, or client MCU system, users need to recompile the source code and run their own code. 2.1 Compile the Source Code ...