Detailed Description

The ROROperator rotates bits in a value to the right right by Amount.

The bits rotated out to the right, are rotated back in from the left. In other words, when rotating 1 bit right, the least significant bit becomes the most significant bit, and all the other bits move one bit to the right.

Arguments

When operator is used inside a signal its default input is automatically tied to signal's InternalValue or previous operator's output. Its default output is automatically tied to next operator's input or to signal's Value. See also CDP Operator Usage In CDP Signals.

Example

To rotate a signal value 4 bits to the right, add a ROROperator<unsigned short> into a Signal<unsigned short> in Configure mode. Then go into the ROROperator that was added, and set Amount to 4.

How to Run the Example

To run the example from CDP Studio, open Welcome mode and find it under Examples. Next, in Configure mode right-click on the system project and select Run & Connect. See the Running the Example Project tutorial for more information.

Set the signal Value containing the ROR operator to 0x000f (15), and verify that the value after the operator has been applied becomes 0xf000(61440)

Actual Processing Code of the ROROperator

unsigned int ROROperator<T>::Process()
{
  if (!m_amountToRotate)
    return STATUS_ERROR;

  const T input = static_cast<T>(m_input);

  uint64_t shift_amount = static_cast<T>(*m_amountToRotate);
  uint64_t leftshift_val = (m_bitSize-shift_amount) % m_bitSize;

  uint64_t lower = input >> shift_amount;
  uint64_t upper = input << leftshift_val;
  m_output = static_cast<T>(upper | lower);
  return STATUS_OK;
}