By Jean J Labrosse; et al
ISBN-10: 0750685832
ISBN-13: 9780750685832
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Extra info for Embedded software
Example text
It will determine what other formats the data can be converted into, and what user interface possibilities exist for the data. In an embedded design, a data structure not only defines storage for data, it also provides a control conduit for accessing control and data registers of the system peripherals. Some peripheral functions may only need byte-wide access, while others may require single bit control. Still others may be a combination of both. In any case, it is essential that the right type of data structure be defined for the type of data to be stored or the type of control to be exercised over the peripheral.
In fact, most if not all modern high-level languages allow the use of CHAR variables in math operations, conditional statements, and even allow the definition of a CHAR variable as either signed or unsigned. In embedded programming, the CHAR is equally as important as the Boolean/BIT data type because most peripheral control registers will be one or more bytes in length and the CHAR variable type is a convenient way to access these registers. Typically, a control register for a peripheral will be defined as a CHAR for byte-wide access, allowing the entire register to be set with one assignment.
Of the two choices, an acknowledge from the receiver is the more efficient use of processor time, so an acknowledge is required as part of any protocol to handle event-driven single transfers. What about data—is it a required part of the transfer? Actually, no, a specific transfer of data is not necessary because the information can be implied in the transfer. For example, when an external limit switch is closed, a monitoring task may set a flag indicating the closure. A receiving task acknowledges the flag by clearing it, indicating it acknowledges the event.