Xmodem

Note,

there has three ways to sent file to destination with “Tera term”.

1. Checksum

128-byte packets

2. CRC

128-byte packets

3. 1k

1024-byte packets was the most popular such solution. In this case, the throughput at 9600 bit/s is 81%

lsz [2]

-vv verbose

-X xmodem

-k 1k

-b binary

 

Reference

[1] http://en.wikipedia.org/wiki/XMODEM

[2] https://opengear.zendesk.com/entries/22923362-Serial-port-file-transfer-using-X-Y-Zmodem

Declarations

C 99 provide programmer a way to save a memory space.

struct DM {

int x,

char* z[]

}

z just a label, compilar won’t allocate a memory for that, and this declaration only could put in last of structure declaration. therefore if we need to allocate a space for this structure when we need to store a data in variable z, otherwise we will assign wrong address which is next to variable x.

 

Reference

[1] C in a nutshell

Keil Firmware Binary

 

Normally, Keil will build the HEX file for Magic Flash to burn the code to MCU or .axf for mvisual.

but it’s not for binary code. therefore we need to using some ways to convert HEX to binary.

1.

C:\Keil\ARM\ARMCC\bin\fromelf.exe --bin --output=myprog.bin myprog.axf[1,2]

2.

C:\Keil\ARM\bin\ElfDwt.exe <filename>.axf BIN(<filename>.bin)[3]

 

and we could check the binary with application(AN11305)[4].

this software will check the signature at 0x1C, (43 f0 ff ef or charater Cðÿï )

Reference

[1]http://www.keil.com/support/docs/3213.htm

[2]http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka11291.html

[3]http://www.lpcware.com/content/blog/binary-file-creation-using-keil-mdk-toolchain

[4]http://www.lpcware.com/content/nxpfile/an11305-usb-system-programming-lpc11u3xlpc11u2x