![]() ![]() The modem manager provides modem dialing capabilities.The serial manager, at the lowest layer, deals with the Palm device serial port and control of the RS232 signals, providing byte-level serial I/O.The software consists of the following layers, described in more detail below: Applications can use functionality of all layers. Higher layers depend on more primitive functionality provided by lower layers. The serial communications software has multiple layers. Serial Communications Architecture Hierarchy That is, data of compound types such as UInt16 (2 bytes) and UInt32 (4 bytes), as well as their integral counterparts, are packaged with the most-significant byte at the lowest address. For more information about this program and the serial port hardware, see the Palm developer web page at:īy convention, all data coming from and going to the Palm OS device use Motorola byte ordering. ![]() You can obtain this information by joining the Solution Provider Program and enrolling in the Serial Port & Modem Casing Program. Palm Computing publishes information designed to assist hardware developers in creating devices to interface with the serial communications port on Palm Computing platform products. The Palm Computing platform device has an external connector that provides: Five external signals are used for this communication: Currently, interrupt-driven transmission of data is not implemented in software, but the hardware does support it. The serial communication is fully interrupt-driven for receiving data. The Palm Computing ® platform device serial port is used for implementing desktop PC connectivity or other external communication. The Serial Link Manager is the Palm OS implementation of the serial link protocol.The Serial Link Protocol provides an efficient mechanism for sending and receiving packets.The Connection Manager allows other applications to access, add, and delete connection pro\xde les contained in the Connection preferences panel.The Serial Manager and the The New Serial Manager are responsible for byte-level serial I/O and control of the RS232 signals.Serial Communications Architecture Hierarchy provides an overview of the hierarchy, including an illustration.Byte Ordering briefly explains the byte order used for all data.Serial Hardware describes the serial port hardware. ![]() This chapter helps you understand the different parts of the serial communications system and explains how to use them, discussing these topics: The Palm OS ® serial communications software provides high-performance serial communications capabilities, including byte-level serial I/O, best-effort packet-based I/O with CRC-16, reliable data transport with retries and acknowledgments, connection management, and modem dialing capabilities. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |