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Converting 32 bit JTAG ID to Avr::TargetSignature instance

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2021-05-02 15:46:54 +01:00
parent 7112f90e70
commit 1cf5e943fd
1 changed files with 29 additions and 0 deletions
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29
src/DebugToolDrivers/Protocols/CMSIS-DAP/VendorSpecific/EDBG/AVR/ResponseFrames/AVR8Generic/GetDeviceId.hpp
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@@ -31,6 +31,35 @@ namespace Bloom::DebugToolDrivers::Protocols::CmsisDap::Edbg::Avr::ResponseFrame
*/
return TargetSignature(payloadData[3], payloadData[2], payloadData[1]);
}
case Avr8PhysicalInterface::JTAG: {
/*
* When using the JTAG interface, the get device ID command returns a 32 bit JTAG ID. This takes
* the following form:
*
* VVVV PPPPPPPPPPPPPPPP MMMMMMMMMMM L
*
* - (V) - Version nibble (4 bits)
* - (P) - Part number (this is typically the AVR signature excluding the manufacture
* byte (0x1E)) (16 bits)
* - (M) - Manufacture identity (11 bits)
* - (L) - LSB indicator (1 bit)
*
* We convert this into a Avr::TargetSignature by extracting the relevant part number and assuming
* a manufacture byte of 0x1E.
*
* TODO: We're not considering the value of the LSB indicator bit. We're just assuming it will
* always be MSB. Is this assumption correct?
*/
auto jtagId = static_cast<std::uint32_t>(
(payloadData[0] << 24) | (payloadData[1] << 16) | (payloadData[2] << 8) | (payloadData[3])
);
return TargetSignature(
0x1E,
static_cast<unsigned char>((jtagId << 4) >> 24),
static_cast<unsigned char>((jtagId << 12) >> 24)
);
}
default: {
return TargetSignature(payloadData[0], payloadData[1], payloadData[2]);
}