AN4141 datasheet(22/42 Pages) STMICROELECTRONICS

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HAL to StdPeriph_Lib list of changes

AN4141

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3.2

Coding rules and conventions

3.2.1

Data types and IO type qualifiers

The Cortex-Mx HAL uses the standard types from the standard ANSI C header file

<stdint.h>. IO type qualifiers are used to specify the access to peripheral variables. IO type

qualifiers are used for the automatic generation of debug information for the peripheral

registers.

As the stm32w108_type.h and iar.h files have been removed from the package, the new

library uses the CMSIS and <stdint.h> types. Table 6 shows the correspondence between

HAL types and <stdint.h> types.

Table 5. CMSIS IO type qualifiers

IO type qualifier

#define

Description

__I

Volatile const

Read access only

__O

Volatile

Write access only

__IO

Volatile

Read and write accesses

Table 6. STM32W108xx HAL vs. CMSIS types

STM32W108 HAL

types

CMSIS types

Description

s32/ int32s

int32_t

signed 32-bit data

s16/int16s

int16_t

signed 16-bit data

s8/int8s

int8_t

signed 8-bit data

sc32

const int32_t

read access only signed 32-bit data

sc16

const int16_t

read access only signed 16-bit data

sc8

const int8_t

read access only signed 8-bit data

vs32

__IO int32_t

volatile read and write access signed 32-bit data

vs16

__IO int16_t

volatile read and write access signed 16-bit data

vs8

__IO int8_t

volatile read and write access signed 8-bit data

vsc32

__I int32_t

volatile read access only signed 32-bit data

vsc16

__I int16_t

volatile read access only signed 16-bit data

vsc8

__I int8_t

volatile read access only signed 8-bit data

u32/ int16u

uint32_t

unsigned 32-bit data

u16/int16u

uint16_t

unsigned 16-bit data

u8/int8u

uint8_t

unsigned 8-bit data

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