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Kenneth Bell
32 lines
772 B
Go
32 lines
772 B
Go
//go:build sam
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package machine
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import (
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"runtime/volatile"
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"unsafe"
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)
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var deviceID [16]byte
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// DeviceID returns an identifier that is unique within
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// a particular chipset.
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//
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// The identity is one burnt into the MCU itself, or the
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// flash chip at time of manufacture.
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//
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// It's possible that two different vendors may allocate
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// the same DeviceID, so callers should take this into
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// account if needing to generate a globally unique id.
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//
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// The length of the hardware ID is vendor-specific, but
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// 8 bytes (64 bits) and 16 bytes (128 bits) are common.
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func DeviceID() []byte {
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for i := 0; i < len(deviceID); i++ {
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word := (*volatile.Register32)(unsafe.Pointer(deviceIDAddr[i/4])).Get()
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deviceID[i] = byte(word >> ((i % 4) * 8))
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}
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return deviceID[:]
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}
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