benjcal

/**********************************************
 * 
 * This simple library is used to redirect
 * functions like printf(), scanf(), putchar()
 * among other to the UART output on the STM32
 * using HAL.
 * 
 * Credits to the book Mastering STM32
 * File by Benjamin Calderon 2017
 * 

bradtraversy

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$ docker

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rikka0w0

In order to save space on the SPI flash, SquashFS + JFFS2 should be used.

SPI Flash structure

Partition	Content		Offset		Size (byte)
mtd0		uboot-bin	0		0x58000 (360448)
		uboot-env	0x58000		0x8000
mtd1		dtb		0x60000		0x4000  (16kB)
mtd2		kernel		0x64000		0x400000 (4MB)
mtd3 rootfs 0x464000	0x4FC000 (4.98MB)

zulonas

local function hex_dump(buf)
      for byte=1, #buf, 16 do
         local chunk = buf:sub(byte, byte + 15)
         io.write(string.format('%08X  ', byte - 1))
         chunk:gsub('.', function (c) io.write(string.format('%02X ', string.byte(c))) end)
         io.write(string.rep(' ', 3 * (16 - #chunk)))
         io.write(' ', chunk:gsub('%c', '.'), "\n")
      end
end