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authorTarek BOCHKATI <tarek.bouchkati@gmail.com>2020-03-07 17:20:24 +0100
committerOleksij Rempel <linux@rempel-privat.de>2020-03-22 08:17:14 +0000
commit4b4389a2d69d96e08d2b417e47c24cad6b50a5c5 (patch)
tree419e5db25022af6d9da01064afe4b992083e07a7 /tcl
parent6ecccc88955ead6283bfa9da123e120a73d4cab8 (diff)
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stlink: workaround serial bug with old ST-Link DFU
Old ST-LINK DFU returns an incorrect serial in the USB descriptor example for the following serial "57FF72067265575742132067" - the correct descriptor serial is: 0x32, 0x03, 0x35, 0x00, 0x37, 0x00, 0x46, 0x00, 0x46, 0x00 ... this contains the length (0x32 = 50), the type (0x3 = DT_STRING) and the serial in unicode format. the serial part is: 0x0035, 0x0037, 0x0046, 0x0046 ... >> 57FF ... this format could be read correctly by 'libusb_get_string_descriptor_ascii' so this case is managed by libusb_helper::string_descriptor_equal - the buggy DFU is not doing any unicode conversion and returns a raw serial data in the descriptor: 0x1a, 0x03, 0x57, 0x00, 0xFF, 0x00, 0x72, 0x00 ... >> 57 FF 72 ... based on the length (0x1a = 26) we could easily decide if we have to fixup the serial and then we have just to convert the raw data into printable characters using sprintf example for an old ST-LINK/V2 standalone: before : 'W?rreWWB g' after : '57FF72067265575742132067' => same as the displayed value in STM32CubeProgrammer tested using these commands using the buggy serial -c "hla_serial \x57\x3f\x72\x06\x72\x65\x57\x57\x42\x13\x20\x67" using the computed serial -c "hla_serial 57FF72067265575742132067" Change-Id: I1213818257663eeb8e76f419087d3127d0524842 Signed-off-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com> Reviewed-on: http://openocd.zylin.com/5396 Reviewed-by: Oleksij Rempel <linux@rempel-privat.de> Tested-by: jenkins Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
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