Texas Instruments SimpleLink CC2620 Technical Reference Manual page 680

Bootloader Interfaces
8.2.3.1 COMMAND_PING
The COMMAND_PING command receives an acknowledge from the bootloader, indicating that
communication has been established. This command is a single byte.
The format of the packet including the command is as follows:
unsigned char ucCommand[3];
ucCommand[0] = <size=3>;
ucCommand[1] = <checksum>;
ucCommand[2] = COMMAND_PING;
8.2.3.2 COMMAND_DOWNLOAD
The COMMAND_DOWNLOAD command is sent to the bootloader to indicate where to store data in flash
and how many bytes will be sent by the COMMAND_SEND_DATA commands that follow. The command
consists of two 32-bit values that are both transferred MSB first. The first 32-bit value is the address to
start programming data into, while the second is the 32-bit size of the data that will be sent. This
command must be followed by a COMMAND_GET_STATUS command to ensure that the program
address and program size are valid for the device. On the CC26xx and CC13xx devices, the flash starts at
address 0x0000 0000. The command does not perform any kind of erase operation; it only prepares for
the following flash programming performed by COMMAND_SEND_DATA commands. Required flash
erase can be done by the COMMAND_BANK_ERASE and COMMAND_SECTOR_ERASE commands.
The format of the packet including the command is as follows:
unsigned char ucCommand[11];
ucCommand[0] = <size=11>;
ucCommand[1] = <checksum>;
ucCommand[2] = COMMAND_DOWNLOAD;
ucCommand[3] = Program Address [31:24];
ucCommand[4] = Program Address [23:16];
ucCommand[5] = Program Address [15:8];
ucCommand[6] = Program Address [7:0];
ucCommand[7] = Program Size [31:24];
ucCommand[8] = Program Size [23:16];
ucCommand[9] = Program Size [15:8];
ucCommand[10] = Program Size [7:0];
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Bootloader
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SWCU117C – February 2015 – Revised September 2015
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