Boot Loader
COMMAND_GET_STATUS
= 0x23
This command returns the status of the last command that was
issued. Typically, this command should be received after every
command is sent to ensure that the previous command was suc-
cessful or, if unsuccessful, to properly respond to a failure. The
command requires one byte in the data of the packet and the
boot loader should respond by sending a packet with one byte of
data that contains the current status code.
The format of the command is as follows:
uint8_t pui8Command[1];
pui8Command[0] = COMMAND_GET_STATUS;
The following are the definitions for the possible status
values that can be returned from the boot loader when
COMMAND_GET_STATUS is sent to the the microcontroller.
COMMAND_RET_SUCCESS
COMMAND_RET_UNKNOWN_CMD
COMMAND_RET_INVALID_CMD
COMMAND_RET_INVALID_ADD
COMMAND_RET_FLASH_FAIL
COMMAND_SEND_DATA
= 0x24
This command should only follow a COMMAND_DOWNLOAD com-
mand or another COMMAND_SEND_DATA command, if more data
is needed. Consecutive send data commands automatically in-
crement the address and continue programming from the previ-
ous location. The transfer size is limited by the maximum size of
a packet, which allows up to 252 data bytes to be transferred at a
time. The command terminates programming once the number
of bytes indicated by the COMMAND_DOWNLOAD command has
been received. Each time this function is called, it should be
followed by a COMMAND_GET_STATUS command to ensure that
the data was successfully programmed into the flash. If the boot
loader sends a NAK to this command, the boot loader will not in-
crement the current address which allows for retransmission of
the previous data.
The format of the command is as follows:
uint8_t pui8Command[9];
pui8Command[0] = COMMAND_SEND_DATA
pui8Command[1] = Data[0];
pui8Command[2] = Data[1];
pui8Command[3] = Data[2];
pui8Command[4] = Data[3];
pui8Command[5] = Data[4];
pui8Command[6] = Data[5];
pui8Command[7] = Data[6];
pui8Command[8] = Data[7];
April 8, 2013 11
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