Texas Instruments SimpleLink CC2620 Technical Reference Manual page 683

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8.2.3.7 COMMAND_GET_CHIP_ID
The COMMAND_GET_CHIP_ID command makes the bootloader return the value of the 32-bit user ID
from the AON_WUW JTAGUSERCODE register. The bootloader first responds by sending the ACK signal
in response to the command; then the bootloader sends a packet of 6 bytes with the size byte, the
checksum byte, and the 4 bytes (MSB first) holding the user ID.
The bootloader then waits for an ACK signal from the host as a confirmation that the packet was received.
The format of the command is as follows:
unsigned char ucCommand[3];
ucCommand[0] = <size=3>;
ucCommand[1] = <checksum>;
ucCommand[2] = COMMAND_GET_CHIP_ID;
8.2.3.8 COMMAND_CRC32
The COMMAND_CRC32 command checks a flash area using CRC32. The command consists of three
32-bit values that are all transferred MSB first. The first 32-bit value is the address in memory from where
the CRC32 calculation starts, the second 32-bit value is the number of bytes comprised by the CRC32
calculation, and the third 32-bit value is the number of read repeats for each data location. A read repeat
count of 0x0000 0000 causes the checksum to be generated by a read of all data locations only once. The
command sends the ACK signal in response to the command after the actual CRC32 calculation. The
result is finally returned as 4 bytes (MSB first) in a 6-byte packet. The bootloader then waits for an ACK
signal from the host as a confirmation that the packet was received. The second parameter that holds the
number of bytes must be higher than eight. If not, the returned checksum is 0xFFFF FFFF.
The format of the packet including the command is as follows:
unsigned char ucCommand[15];
ucCommand[0] = <size=15>;
ucCommand[1] = <checksum>;
ucCommand[2]= COMMAND_CRC32;
ucCommand[3]= Data Address [31:24];
ucCommand[4]= Data Address [23:16];
ucCommand[5]= Data Address [15: 8];
ucCommand[6]= Data Address [ 7: 0];
ucCommand[7]= Data Size [31:24];
ucCommand[8]= Data Size [23:16];
ucCommand[9]= Data Size [15: 8];
ucCommand[10]= Data Size [7: 0];
ucCommand[11]= Read Repeat Count [31:24];
ucCommand[12]= Read Repeat Count [23:16];
ucCommand[13]= Read Repeat Count [15: 8];
ucCommand[14]= Read Repeat Count [7: 0];
SWCU117C – February 2015 – Revised September 2015
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Bootloader Interfaces
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Bootloader