MemoryDevice Device Class

A special sub-class(named tuple) of Device, MemoryDevice, provides an alternative to creating a custom Device which uses _rawRead and _rawWrite calls.

  • MemoryDevice allows values contained within a yaml configuration file to be written directly to memory, bypassing the normal Variables

    • Useful for large blocks of data which need to be written

    • Accesses can be non-contiguous

    • A MemoryDevice is write only

dev = MemoryDevice(name=None, offset = 0, size = 0,
                   wordBitSize=32, stride = 4,
                   base = pyrogue.UInt)

  • Parameters:

    • wordBitSize: the size of each value in bits

    • stride: the spacing between the value locations in bytes

    • base: base class indicating the type of value contained in the memory

  • The configuration yaml file is expected to contain a set of offsets and value

    • MemoryDeviceName:

      • 256: 0x12,0x13,0x14,0x15

      • 512: 0x22,0x23,0x24,0x25

  • Results in the following address:values pairs being written to memory (wordBitSize=32, stride=4)

    • 256 = 0x12, 260 = 0x13, 264 = 0x14, 268 = 0x15

    • 512 = 0x22, 516 = 0x23, 520 = 0x24, 524 = 0x25

MemoryDevice Type Definition

# MemoryDevice type
MemoryDevice = namedtuple('MemoryDevice', ['name', 'offset', 'size', 'wordBitSize', 'stride', 'base'],
                       defaults=['DevName', 0x00000, 16, 8, 16, 'pr.Int'])