Microchip PIC32CX1025SG41128 Manual

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TB3291

The Difference Between MPLAB Harmony v3 PLIBs and

Drivers, and When to Use Them

Introduction

MPLAB® Harmony v3 provides layered and modular software libraries that support a flexible embedded software

development model. The core libraries under MPLAB Harmony v3 includes Peripheral Libraries (PLIBs), drivers, and

system services. The PLIBs provide low-level device-specific support. The drivers and system services provide

hardware abstraction upon which a highly capable Middleware is built.

This document explains the differences between the MPLAB Harmony v3 PLIBs and drivers, and it also describes

when to use them.

1. Description

1.1 Peripheral Libraries

The MPLAB Harmony v3 Peripheral Library (PLIB) is a low-level interface library to access a peripheral on a

microcontroller. The PLIB Application Program Interfaces (APIs) hide peripheral register details and make it easier to

configure the peripheral per the application requirements by calling the PLIB APIs.

The MPLAB Harmony v3 Peripheral Library features are as follows:

• Simple and user-friendly APIs.

• Abstraction layers are not implemented; has direct register access.

• Clean code and no conditional macros (for example, #if, #elif).

• Easy to integrate into existing applications.

• Self-containing and self-sufficient implementation. In general, all PLIBs are interrupt driven, but few PLIBs have

blocking implementation in addition to interrupt driven implementation.

• PLIBs can be easily extended to add new features.

• PLIBs provide status using polling and interrupt mode (through a callback mechanism) implementation models

for data transaction operations. By using these models, the application can either poll the status of the submitted

request, or choose to get notified when the request is complete by registering a callback API in an application.

• Consistent API signature for similar peripherals across 32-bit SAM and PIC microcontroller families. The

following table illustrates the PLIB API signatures.

Usage UART SPI I2C/TWI

Initialization UARTx_Initialize() SPIx_Initialize() TWIx_Initialize()

Transaction

UARTx_Write() SPIx_Write() TWIx_Write()

UARTx_Read() SPIx_Read() TWIx_Read()

-SPIx_WriteRead() TWIx_WriteRead()

Status

UARTx_ReadIsBusy()

SPIx_IsBusy() TWIx_IsBusy()

UARTx_WriteIsBusy()

1.2 Drivers

The MPLAB Harmony v3 drivers are a highly abstracted interface to control, access, manage peripherals, and other

resources on the 32-bit SAM and PIC microcontrollers. The driver interface allows applications and other client

modules (drivers, Middleware libraries and system services) to interact with the peripheral.

The following are MPLAB Harmony v3 driver features:

• Abstracted interfaces: Enables portability and interoperability.

• Drivers are built on the top of the PLIBs.

• A driver is capable of handling multiple instances of a peripheral without duplicating the driver code to handle

the individual instance of a peripheral. The multiple instance support of MPLAB Harmony v3 drivers enables the

application to remain the same even when the peripheral instance is changed.

USART Driver API USART PLIB API

DRV_USART_WriteBufferAdd(…)

USART1_Write(…)

USART2_Write(…)

TB3291

Description

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	PIC32CX1025SG41128

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