The 8155 driver primarily involves configuring the PA, PB, and PC ports, control words, and timers. It includes several key functions and code segments that are essential for proper operation. Below is a detailed explanation of the main components involved in the driver setup.
(1) Function declarations and pin definitions.
Pin definitions include the configuration of port PA, port PB, port PC, the control word, timer A and B, memory start address, and related flag bits. These definitions are crucial for ensuring accurate communication with the 8155 chip. The function declarations involve reading from and writing to memory as well as the PA, PB, and PC ports. They also include interrupt enable/disable functions and timer-related operations. The specific code implementation is shown below:
In addition to the basic setup, the driver also handles timing control through the internal timers, which are used for generating delays or managing periodic tasks. The control word determines the mode of operation for each port, whether it's input, output, or a combination of both. Proper initialization of these registers ensures that the 8155 can communicate effectively with the microcontroller and perform its intended functions. This driver is commonly used in embedded systems where simple I/O expansion and timing features are required.
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