2.2 Analog Comparator Controller (ACC)
The Analog Comparator Controller (ACC) configures the analog comparator and generates an interrupt depending on user settings. The analog comparator embeds two 8-to-1 multiplexers that generate two internal inputs. These inputs are compared, resulting in a compare output. The hysteresis level, edge detection and polarity are configurable. The ACC also generates a compare event which can be used by the Pulse Width Modulator (PWM).
Using The Library
The analog comparison status can be polled by the software or can be configured to generate a callback.
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With polling, the application will need to continuously poll to check if the comparison edge occurred
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With Callback, the registered callback function will be called when comparison edge is detected. This means the application do not have to poll continuously.
Library Interface
Analog Comparator Controller peripheral library provides the following interfaces:
Functions
| Name | Description |
|---|---|
| ACC_Initialize | Initializes ACC module of the device |
| ACC_Enable | Enables ACC peripheral |
| ACC_Disable | Enables ACC peripheral |
| ACC_StatusGet | Returns comparison status of the ACC |
| ACC_RegisterCallback | Allows application to register callback with PLIB |
| ACC_CallbackRegister | Allows application to register callback with PLIB |
Data types and constants
| Name | Type | Description |
|---|---|---|
| ACC_STATUS_SOURCE | Enum | Identifies ACC Comparison status |
| ACC_CALLBACK | Typedef | ACC Callback function pointer |
| ACC_CALLBACK | Typedef | ACC callback function pointer |