HAL

Hardware Abstraction Layer. More...

Collaboration diagram for HAL:

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Description

Hardware Abstraction Layer.

Under ChibiOS/RT the set of the various device driver interfaces is called the HAL subsystem: Hardware Abstraction Layer.
A device driver is usually split in two layers:

• High Level Device Driver (HLD). This layer contains the definitions of the driver's APIs and the platform independent part of the driver.
  An HLD is composed by two files:
  • <driver>.c, the HLD implementation file. This file must be included in the Makefile in order to use the driver.
  • <driver>.h, the HLD header file. This file is implicitly included by the HAL header file hal.h.
• Low Level Device Driver (LLD). This layer contains the platform dependent part of the driver.
  A LLD is composed by two files:
  • <driver>_lld.c, the LLD implementation file. This file must be included in the Makefile in order to use the driver.
  • <driver>_lld.h, the LLD header file. This file is implicitly included by the HLD header file.
  The LLD may be not present in those drivers that do not access the hardware directly but through other device drivers, as example the MMC over SPI Driver driver uses the SPI Driver and PAL Driver drivers in order to implement its functionalities.

Available Device Drivers

The I/O subsystem currently includes support for:

• HAL Driver.
• PAL Driver.
• Serial Driver.
• ADC Driver.
• CAN Driver.
• MAC Driver.
• MMC over SPI Driver.
• SPI Driver.

Modules
	HAL Driver
	Hardware Abstraction Layer.
	PAL Driver
	I/O Ports Abstraction Layer.
	Serial Driver
	Generic Serial Driver.
	SPI Driver
	Generic SPI Driver.
	ADC Driver
	Generic ADC Driver.
	CAN Driver
	Generic CAN Driver.
	PWM Driver
	Generic PWM Driver.
	MAC Driver
	Generic MAC driver.
	MMC over SPI Driver
	Generic MMC driver.