Need EXplanation for a single line

Posted on July 29, 2015 at 15:07

i have done bootloader and its jumps.

but i like to know what the below line exactly does, Can anyone explain exactly why we give 0x2FFE0000 and do ''and '' mask and how it works?

if (((*(__IO uint32_t*)APPLICATION_ADDRESS) & 0x2FFE0000 ) == 0x20000000)

thank you

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Guru

Posted on July 29, 2015 at 16:35

It's attempting to confirm if the initial stack pointer holds some valid value pointing to SRAM and not some random junk.

It's a rough test approximating the SP in the 0x20000000..0x2001FFFF (128KB) range.

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