hal_bool3hal

Overview

typedef ... hal_bool;

A type which may have a value of 0 or nonzero.

typedef ... hal_bit_t;

A volatile type which may have a value of 0 or nonzero.

typedef ... hal_s32_t;

A volatile type which may have a value from -2147483648 to 2147483647.

typedef ... hal_u32_t;

A volatile type which may have a value from 0 to 4294967295.

typedef ... hal_port_t;

A volatile handle to a port object. Used with hal_port* functions.

typedef ... hal_float_t;

A volatile floating-point type, which typically has the same precision and range as the C type double.

typedef ... real_t;

A nonvolatile floating-point type with at least as much precision as hal_float_t.

typedef ... ireal_t;

A nonvolatile unsigned integral type the same size as hal_float_t.

typedef enum hal_type_t;

HAL_BIT

Corresponds to the type hal_bit_t.

HAL_FLOAT

Corresponds to the type hal_float_t.

HAL_S32

Corresponds to the type hal_s32_t.

HAL_U32

Corresponds to the type hal_u32_t.

Notes

hal_bit_t is typically a typedef to an integer type whose range is larger than just 0 and 1. When testing the value of a hal_bit_t, never compare it to 1. Prefer one of the following:

It is often useful to refer to a type that can represent all the values as a HAL type, but without the volatile qualifier. The following types correspond with the HAL types:

Take care not to use the types s32 and u32. These will compile in kernel modules but not in userspace, and not for realtime components when using uspace realtime.