The driver for the 8255A mainly involves configuring the ports A, B, C, and the control word. The specific implementation of the 8255A driver includes several key functions and code segments that define how the chip interacts with the system.
(1) Pin definition and function declaration.
Pin definition refers to the assignment and description of port A, port B, port C, and the control signals, as well as the status flags used in the communication process. Function declarations include the read and write operations for each port, along with the configuration of the control word and the specific settings for port C. This ensures that the 8255A can be properly initialized and controlled by the program.
The following code snippets illustrate the setup and usage of the 8255A driver:
These images show the register layout and some typical code examples used in setting up the 8255A chip. Understanding these configurations is essential for developers who want to interface with peripheral devices using this programmable I/O chip.
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