How to get the Image Header from .bin file?

Tony Cui

Prodigy 35 points

Other Parts Discussed in Thread: CC2540

Hi experts,

I try to implement the OAD function with CC2540 on Android Phone. I follow the OAD_for_cc2540 document.

The notification on the OAD Target can be enabled. I shall write to the image identify with a message data .

my question is how could I get the image header from .bin.

Best regards,

over 12 years ago

0 Jack Phan over 12 years ago

Intellectual 470 points

Hi,

The first 16bytes in the .bin holds the image header info:

Byte 0 to 1 : check sum CRC 

Byte 2 to 3 : 0xFFFF, reserve here to use later for OAD process finished

Byte 4 to 5 : current image version 

Byte 6 to 7: image size. This is number of groups of 4bytes in the image. For example, with the image size is 124KB, then the total number = 124KB /4 = (124*1024)/4 = 126976/4 = 31744 = 0x7C00. 

Byte 8 to 11: current image type ( {‘A’, ‘A’, ‘A’, ‘A’} or {‘B’, ‘B’, ‘B’, ‘B’} ) 

Byte 12 to 15: reserve, all 0xFF

You could read this info by using reading flash function and then send back to Central by Notification.

Good luck,

Jack

0 Tony Cui over 12 years ago in reply to Jack Phan

Prodigy 35 points

Thanks a lot. ;-)

0 Rajiv Mainvannan over 11 years ago in reply to Jack Phan

Prodigy 20 points

Hi Jack,

Thanks for the info.

I'm getting a negative values while reading the bin file header. I've implemented in java. Kindly refer the below code.

I've read the bin file into a InputStream object and using the below function tried to read the binary file version and length. But getting negative values.

short version = Uint16(fileBuffer[5], fileBuffer[4]);
short length = Uint16(fileBuffer[7], fileBuffer[6]);

public short Uint16(byte high, byte low) {
return (short) ((high << 8) + (low & 0xff));
}

Thanks in advance for your help.

Rajiv.

Bluetooth®︎

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How to get the Image Header from .bin file?