Macros for using decorated memory accesses with the Bit Manipulation Engine available in Kinetis Cortex-M0+ devices. More...

Detailed Description

Macros for using decorated memory accesses with the Bit Manipulation Engine available in Kinetis Cortex-M0+ devices.

Files
file	bme.h
	Macro definitions for the Kinetis Bit Manipulation Engine (BME)

Macros
#define	BITBAND_FUNCTIONS_PROVIDED 1
	Tell bit.h that we provide CPU specific bit manipulation functions.

#define	BME_AND_MASK (1 << 26)
	AND decoration bitmask.

#define	BME_OR_MASK (1 << 27)
	OR decoration bitmask.

#define	BME_XOR_MASK (3 << 26)
	XOR decoration bitmask.

#define	BME_LAC1_MASK(BIT) ((1 << 27) \| ((BIT) << 21))
	Load-and-clear 1 bit.

#define	BME_LAS1_MASK(BIT) ((3 << 26) \| ((BIT) << 21))
	Load-and-set 1 bit.

#define	BME_BF_MASK(bit, width) ((1 << 28) \| ((bit) << 23) \| (((width) - 1 ) << 19))
	Bit field extraction bitmask. More...

Functions
static volatile void *	bme_bf_addr (volatile void *ptr, uintptr_t bit, uintptr_t width)
	Bit field address macro. More...

static volatile uint32_t *	bme_bitfield32 (volatile uint32_t *ptr, uint8_t bit, uint8_t width)
	Access a bitfield (32 bit load/store) More...

static volatile uint16_t *	bme_bitfield16 (volatile uint16_t *ptr, uint8_t bit, uint8_t width)
	Access a bitfield (16 bit load/store) More...

static volatile uint8_t *	bme_bitfield8 (volatile uint8_t *ptr, uint8_t bit, uint8_t width)
	Access a bitfield (8 bit load/store) More...

static void	bit_set32 (volatile uint32_t *ptr, uint8_t bit)
	Set a single bit in the 32 bit word pointed to by `ptr`. More...

static void	bit_set16 (volatile uint16_t *ptr, uint8_t bit)
	Set a single bit in the 16 bit word pointed to by `ptr`. More...

static void	bit_set8 (volatile uint8_t *ptr, uint8_t bit)
	Set a single bit in the 8 bit byte pointed to by `ptr`. More...

static void	bit_clear32 (volatile uint32_t *ptr, uint8_t bit)
	Clear a single bit in the 32 bit word pointed to by `ptr`. More...

static void	bit_clear16 (volatile uint16_t *ptr, uint8_t bit)
	Clear a single bit in the 16 bit word pointed to by `ptr`. More...

static void	bit_clear8 (volatile uint8_t *ptr, uint8_t bit)
	Clear a single bit in the 8 bit byte pointed to by `ptr`. More...

Macro Definition Documentation

◆ BME_BF_MASK

#define BME_BF_MASK	(	bit,
		width
	)	((1 << 28) \| ((bit) << 23) \| (((width) - 1 ) << 19))

Bit field extraction bitmask.

Parameters

bit	LSB of the bitfield within the word/halfword/byte
width	Number of bits to extract

Definition at line 49 of file bme.h.

Function Documentation

◆ bit_clear16()

static void bit_clear16	(	volatile uint16_t *	ptr,
		uint8_t	bit
	)

inlinestatic

Clear a single bit in the 16 bit word pointed to by ptr.

The effect is the same as for the following snippet:

*ptr &= ~(1 << bit);

There is a read-modify-write cycle occurring within the core, but this cycle is atomic and can not be disrupted by IRQs

Parameters

[in]	ptr	pointer to target word
[in]	bit	bit number within the word

Definition at line 225 of file bme.h.

◆ bit_clear32()

static void bit_clear32	(	volatile uint32_t *	ptr,
		uint8_t	bit
	)

inlinestatic

Clear a single bit in the 32 bit word pointed to by ptr.

The effect is the same as for the following snippet:

*ptr &= ~(1 << bit);

There is a read-modify-write cycle occurring within the core, but this cycle is atomic and can not be disrupted by IRQs

Parameters

[in]	ptr	pointer to target word
[in]	bit	bit number within the word

Definition at line 205 of file bme.h.

◆ bit_clear8()

static void bit_clear8	(	volatile uint8_t *	ptr,
		uint8_t	bit
	)

inlinestatic

Clear a single bit in the 8 bit byte pointed to by ptr.

The effect is the same as for the following snippet:

*ptr &= ~(1 << bit);

There is a read-modify-write cycle occurring within the core, but this cycle is atomic and can not be disrupted by IRQs

Parameters

[in]	ptr	pointer to target byte
[in]	bit	bit number within the byte

Definition at line 245 of file bme.h.

◆ bit_set16()

static void bit_set16	(	volatile uint16_t *	ptr,
		uint8_t	bit
	)

inlinestatic

Set a single bit in the 16 bit word pointed to by ptr.

The effect is the same as for the following snippet:

*ptr |= (1 << bit);

There is a read-modify-write cycle occurring within the core, but this cycle is atomic and can not be disrupted by IRQs

Parameters

[in]	ptr	pointer to target word
[in]	bit	bit number within the word

Definition at line 165 of file bme.h.

◆ bit_set32()

static void bit_set32	(	volatile uint32_t *	ptr,
		uint8_t	bit
	)

inlinestatic

Set a single bit in the 32 bit word pointed to by ptr.

The effect is the same as for the following snippet:

*ptr |= (1 << bit);

There is a read-modify-write cycle occurring within the core, but this cycle is atomic and can not be disrupted by IRQs

Parameters

[in]	ptr	pointer to target word
[in]	bit	bit number within the word

Definition at line 145 of file bme.h.

◆ bit_set8()

static void bit_set8	(	volatile uint8_t *	ptr,
		uint8_t	bit
	)

inlinestatic

Set a single bit in the 8 bit byte pointed to by ptr.

The effect is the same as for the following snippet:

*ptr |= (1 << bit);

There is a read-modify-write cycle occurring within the core, but this cycle is atomic and can not be disrupted by IRQs

Parameters

[in]	ptr	pointer to target byte
[in]	bit	bit number within the byte

Definition at line 185 of file bme.h.

◆ bme_bf_addr()

static volatile void* bme_bf_addr	(	volatile void *	ptr,
		uintptr_t	bit,
		uintptr_t	width
	)

inlinestatic

Bit field address macro.

Precondition: The target address must lie within a part of the peripheral address space 0x40000000 - 0x40070000

Parameters

[in]	ptr	Pointer to target register
[in]	bit	Location of the LSB of the bitfield within the register
[in]	width	Width of the the bitfield, in bits

Returns: bitfield address as an uintptr_t

Definition at line 63 of file bme.h.

◆ bme_bitfield16()

static volatile uint16_t* bme_bitfield16	(	volatile uint16_t *	ptr,
		uint8_t	bit,
		uint8_t	width
	)

inlinestatic

Access a bitfield (16 bit load/store)

This macro can be used both for store (*bme_bitfield16(xxx) = y) and load (y = *bme_bitfield16(ptr, bit))

Precondition: The target address must lie within a part of the peripheral address space 0x40000000 - 0x40070000

Parameters

[in]	ptr	Pointer to target register
[in]	bit	Location of the LSB of the bitfield within the register
[in]	width	Width of the the bitfield, in bits

Returns: bitfield extracted as a (modifiable) lvalue

Definition at line 103 of file bme.h.

◆ bme_bitfield32()

static volatile uint32_t* bme_bitfield32	(	volatile uint32_t *	ptr,
		uint8_t	bit,
		uint8_t	width
	)

inlinestatic

Access a bitfield (32 bit load/store)

This macro can be used both for store (*bme_bitfield32(xxx) = y) and load (y = *bme_bitfield32(ptr, bit))

Precondition: The target address must lie within a part of the peripheral address space 0x40000000 - 0x40070000

Parameters

[in]	ptr	Pointer to target register
[in]	bit	Location of the LSB of the bitfield within the register
[in]	width	Width of the the bitfield, in bits

Returns: bitfield extracted as a (modifiable) lvalue

Definition at line 83 of file bme.h.

◆ bme_bitfield8()

static volatile uint8_t* bme_bitfield8	(	volatile uint8_t *	ptr,
		uint8_t	bit,
		uint8_t	width
	)

inlinestatic

Access a bitfield (8 bit load/store)

This macro can be used both for store (*bme_bitfield8(xxx) = y) and load (y = *bme_bitfield8(ptr, bit))

Precondition: The target address must lie within a part of the peripheral address space 0x40000000 - 0x40070000

Parameters

[in]	ptr	Pointer to target register
[in]	bit	Location of the LSB of the bitfield within the register
[in]	width	Width of the the bitfield, in bits

Returns: bitfield extracted as a (modifiable) lvalue

Definition at line 123 of file bme.h.

Detailed Description

Files

Macros

Functions

Macro Definition Documentation

◆ BME_BF_MASK

Function Documentation

◆ bit_clear16()

◆ bit_clear32()

◆ bit_clear8()

◆ bit_set16()

◆ bit_set32()

◆ bit_set8()

◆ bme_bf_addr()

◆ bme_bitfield16()

◆ bme_bitfield32()

◆ bme_bitfield8()