pdl: Update endianness documentation (91b6ec3d) · Commits · e / os / android_packages_modules_Bluetooth

tools/pdl/doc/reference.md

+20 −9

Original line number	Diff line number	Diff line
		@@ -67,26 +67,37 @@ packet Coffee {
		d: 5,
		}

		// The first two field are laid out as a single
		// integer of 16-bits
		// MSB LSB
		// 16 8 0
		// +---------------------------------------+
		// \| b14 .. .. b0 \|a\|
		// +---------------------------------------+
		//
		// The file endianness is applied to this integer
		// to obtain the byte layout of the packet fields.
		//
		// Little endian layout
		// LSB MSB
		// 0 1 2 3 4 5 6 7
		// MSB LSB
		// 7 6 5 4 3 2 1 0
		// +---------------------------------------+
		// 0 \| a \| b[6:0] \|
		// 0 \| b[6:0] \| a \|
		// +---------------------------------------+
		// 1 \| b[14:7] \|
		// +---------------------------------------+
		// 2 \| c \| d \|
		// 2 \| d \| c \|
		// +---------------------------------------+

		//
		// Big endian layout
		// LSB MSB
		// 0 1 2 3 4 5 6 7
		// MSB LSB
		// 7 6 5 4 3 2 1 0
		// +---------------------------------------+
		// 0 \| b[14:7] \|
		// +---------------------------------------+
		// 1 \| a \| b[6:0] \|
		// 1 \| b[6:0] \| a \|
		// +---------------------------------------+
		// 2 \| c \| d \|
		// 2 \| d \| c \|
		// +---------------------------------------+
		```