PIO instruction encoding. More...

Enumerations
enum	pio_src_dest { pio_pins = 0u, pio_x = 1u, pio_y = 2u, pio_null = 3u \| 0x20u \| 0x80u, pio_pindirs = 4u \| 0x08u \| 0x40u \| 0x80u, pio_exec_mov = 4u \| 0x08u \| 0x10u \| 0x20u \| 0x40u, pio_status = 5u \| 0x08u \| 0x10u \| 0x20u \| 0x80u, pio_pc = 5u \| 0x08u \| 0x20u \| 0x40u, pio_isr = 6u \| 0x20u, pio_osr = 7u \| 0x10u \| 0x20u, pio_exec_out = 7u \| 0x08u \| 0x20u \| 0x40u \| 0x80u }
	Enumeration of values to pass for source/destination args for instruction encoding functions. More...

Functions
static uint	pio_encode_delay (uint cycles)
	Encode just the delay slot bits of an instruction. More...

static uint	pio_encode_sideset (uint sideset_bit_count, uint value)
	Encode just the side set bits of an instruction (in non optional side set mode) More...

static uint	pio_encode_sideset_opt (uint sideset_bit_count, uint value)
	Encode just the side set bits of an instruction (in optional -`opt` side set mode) More...

static uint	pio_encode_jmp (uint addr)
	Encode an unconditional JMP instruction. More...

static uint	pio_encode_jmp_not_x (uint addr)
	Encode a conditional JMP if scratch X zero instruction. More...

static uint	pio_encode_jmp_x_dec (uint addr)
	Encode a conditional JMP if scratch X non-zero (and post-decrement X) instruction. More...

static uint	pio_encode_jmp_not_y (uint addr)
	Encode a conditional JMP if scratch Y zero instruction. More...

static uint	pio_encode_jmp_y_dec (uint addr)
	Encode a conditional JMP if scratch Y non-zero (and post-decrement Y) instruction. More...

static uint	pio_encode_jmp_x_ne_y (uint addr)
	Encode a conditional JMP if scratch X not equal scratch Y instruction. More...

static uint	pio_encode_jmp_pin (uint addr)
	Encode a conditional JMP if input pin high instruction. More...

static uint	pio_encode_jmp_not_osre (uint addr)
	Encode a conditional JMP if output shift register not empty instruction. More...

static uint	pio_encode_wait_gpio (bool polarity, uint gpio)
	Encode a WAIT for GPIO pin instruction. More...

static uint	pio_encode_wait_pin (bool polarity, uint pin)
	Encode a WAIT for pin instruction. More...

static uint	pio_encode_wait_irq (bool polarity, bool relative, uint irq)
	Encode a WAIT for IRQ instruction. More...

static uint	pio_encode_in (enum pio_src_dest src, uint count)
	Encode an IN instruction. More...

static uint	pio_encode_out (enum pio_src_dest dest, uint count)
	Encode an OUT instruction. More...

static uint	pio_encode_push (bool if_full, bool block)
	Encode a PUSH instruction. More...

static uint	pio_encode_pull (bool if_empty, bool block)
	Encode a PULL instruction. More...

static uint	pio_encode_mov (enum pio_src_dest dest, enum pio_src_dest src)
	Encode a MOV instruction. More...

static uint	pio_encode_mov_not (enum pio_src_dest dest, enum pio_src_dest src)
	Encode a MOV instruction with bit invert. More...

static uint	pio_encode_mov_reverse (enum pio_src_dest dest, enum pio_src_dest src)
	Encode a MOV instruction with bit reverse. More...

static uint	pio_encode_irq_set (bool relative, uint irq)
	Encode a IRQ SET instruction. More...

static uint	pio_encode_irq_wait (bool relative, uint irq)
	Encode a IRQ WAIT instruction. More...

static uint	pio_encode_irq_clear (bool relative, uint irq)
	Encode a IRQ CLEAR instruction. More...

static uint	pio_encode_set (enum pio_src_dest dest, uint value)
	Encode a SET instruction. More...

static uint	pio_encode_nop (void)
	Encode a NOP instruction. More...

Detailed Description

PIO instruction encoding.

Functions for generating PIO instruction encodings programmatically. In debug builds PARAM_ASSERTIONS_ENABLED_PIO_INSTRUCTIONS can be set to 1 to enable validation of encoding function parameters.

For fuller descriptions of the instructions in question see the "RP2040 Datasheet"

Enumeration Type Documentation

◆ pio_src_dest

enum pio_src_dest

Enumeration of values to pass for source/destination args for instruction encoding functions.

Note: Not all values are suitable for all functions. Validity is only checked in debug mode when PARAM_ASSERTIONS_ENABLED_PIO_INSTRUCTIONS is 1

Function Documentation

◆ pio_encode_delay()

static uint pio_encode_delay ( uint cycles )

inlinestatic

Encode just the delay slot bits of an instruction.

Note: This function does not return a valid instruction encoding; instead it returns an encoding of the delay slot suitable for ORing with the result of an encoding function for an actual instruction. Care should be taken when combining the results of this function with the results of pio_encode_sideset and pio_encode_sideset_opt as they share the same bits within the instruction encoding.

Parameters

cycles the number of cycles 0-31 (or less if side set is being used)

Returns: the delay slot bits to be ORed with an instruction encoding

◆ pio_encode_in()

static uint pio_encode_in	(	enum pio_src_dest	src,
		uint	count
	)

inlinestatic

Encode an IN instruction.

This is the equivalent of IN <src>, <count>

Parameters

src	The source to take data from
count	The number of bits 1-32

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_irq_clear()

static uint pio_encode_irq_clear	(	bool	relative,
		uint	irq
	)

inlinestatic

Encode a IRQ CLEAR instruction.

This is the equivalent of IRQ CLEAR <irq> <relative>

Parameters

relative	true for a `IRQ CLEAR <irq> REL`, false for regular `IRQ CLEAR <irq>`
irq	the irq number 0-7

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_irq_set()

static uint pio_encode_irq_set	(	bool	relative,
		uint	irq
	)

inlinestatic

Encode a IRQ SET instruction.

This is the equivalent of IRQ SET <irq> <relative>

Parameters

relative	true for a `IRQ SET <irq> REL`, false for regular `IRQ SET <irq>`
irq	the irq number 0-7

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_irq_wait()

static uint pio_encode_irq_wait	(	bool	relative,
		uint	irq
	)

inlinestatic

Encode a IRQ WAIT instruction.

This is the equivalent of IRQ WAIT <irq> <relative>

Parameters

relative	true for a `IRQ WAIT <irq> REL`, false for regular `IRQ WAIT <irq>`
irq	the irq number 0-7

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_jmp()

static uint pio_encode_jmp ( uint addr )

inlinestatic

Encode an unconditional JMP instruction.

This is the equivalent of JMP <addr>

Parameters

addr	The target address 0-31 (an absolute address within the PIO instruction memory)

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_jmp_not_osre()

static uint pio_encode_jmp_not_osre ( uint addr )

inlinestatic

Encode a conditional JMP if output shift register not empty instruction.

This is the equivalent of JMP !OSRE <addr>

Parameters

addr	The target address 0-31 (an absolute address within the PIO instruction memory)

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_jmp_not_x()

static uint pio_encode_jmp_not_x ( uint addr )

inlinestatic

Encode a conditional JMP if scratch X zero instruction.

This is the equivalent of JMP !X <addr>

Parameters

addr	The target address 0-31 (an absolute address within the PIO instruction memory)

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_jmp_not_y()

static uint pio_encode_jmp_not_y ( uint addr )

inlinestatic

Encode a conditional JMP if scratch Y zero instruction.

This is the equivalent of JMP !Y <addr>

Parameters

addr	The target address 0-31 (an absolute address within the PIO instruction memory)

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_jmp_pin()

static uint pio_encode_jmp_pin ( uint addr )

inlinestatic

Encode a conditional JMP if input pin high instruction.

This is the equivalent of JMP PIN <addr>

Parameters

addr	The target address 0-31 (an absolute address within the PIO instruction memory)

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_jmp_x_dec()

static uint pio_encode_jmp_x_dec ( uint addr )

inlinestatic

Encode a conditional JMP if scratch X non-zero (and post-decrement X) instruction.

This is the equivalent of JMP X-- <addr>

Parameters

addr	The target address 0-31 (an absolute address within the PIO instruction memory)

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_jmp_x_ne_y()

static uint pio_encode_jmp_x_ne_y ( uint addr )

inlinestatic

Encode a conditional JMP if scratch X not equal scratch Y instruction.

This is the equivalent of JMP X!=Y <addr>

Parameters

addr	The target address 0-31 (an absolute address within the PIO instruction memory)

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_jmp_y_dec()

static uint pio_encode_jmp_y_dec ( uint addr )

inlinestatic

Encode a conditional JMP if scratch Y non-zero (and post-decrement Y) instruction.

This is the equivalent of JMP Y-- <addr>

Parameters

addr	The target address 0-31 (an absolute address within the PIO instruction memory)

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_mov()

static uint pio_encode_mov	(	enum pio_src_dest	dest,
		enum pio_src_dest	src
	)

inlinestatic

Encode a MOV instruction.

This is the equivalent of MOV <dest>, <src>

Parameters

dest	The destination to write data to
src	The source to take data from

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_mov_not()

static uint pio_encode_mov_not	(	enum pio_src_dest	dest,
		enum pio_src_dest	src
	)

inlinestatic

Encode a MOV instruction with bit invert.

This is the equivalent of MOV <dest>, ~<src>

Parameters

dest	The destination to write inverted data to
src	The source to take data from

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_mov_reverse()

static uint pio_encode_mov_reverse	(	enum pio_src_dest	dest,
		enum pio_src_dest	src
	)

inlinestatic

Encode a MOV instruction with bit reverse.

This is the equivalent of MOV <dest>, ::<src>

Parameters

dest	The destination to write bit reversed data to
src	The source to take data from

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_nop()

static uint pio_encode_nop ( void )

inlinestatic

Encode a NOP instruction.

This is the equivalent of NOP which is itself encoded as MOV y, y

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_out()

static uint pio_encode_out	(	enum pio_src_dest	dest,
		uint	count
	)

inlinestatic

Encode an OUT instruction.

This is the equivalent of OUT <src>, <count>

Parameters

dest	The destination to write data to
count	The number of bits 1-32

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_pull()

static uint pio_encode_pull	(	bool	if_empty,
		bool	block
	)

inlinestatic

Encode a PULL instruction.

This is the equivalent of PULL <if_empty>, <block>

Parameters

if_empty	true for `PULL IF_EMPTY ...`, false for `PULL ...`
block	true for `PULL ... BLOCK`, false for `PULL ...`

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_push()

static uint pio_encode_push	(	bool	if_full,
		bool	block
	)

inlinestatic

Encode a PUSH instruction.

This is the equivalent of PUSH <if_full>, <block>

Parameters

if_full	true for `PUSH IF_FULL ...`, false for `PUSH ...`
block	true for `PUSH ... BLOCK`, false for `PUSH ...`

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_set()

static uint pio_encode_set	(	enum pio_src_dest	dest,
		uint	value
	)

inlinestatic

Encode a SET instruction.

This is the equivalent of SET <dest>, <value>

Parameters

dest	The destination to apply the value to
value	The value 0-31

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_sideset()

static uint pio_encode_sideset	(	uint	sideset_bit_count,
		uint	value
	)

inlinestatic

Encode just the side set bits of an instruction (in non optional side set mode)

Note: This function does not return a valid instruction encoding; instead it returns an encoding of the side set bits suitable for ORing with the result of an encoding function for an actual instruction. Care should be taken when combining the results of this function with the results of pio_encode_delay as they share the same bits within the instruction encoding.

Parameters

sideset_bit_count	number of side set bits as would be specified via `.sideset` in pioasm
value	the value to sideset on the pins

Returns: the side set bits to be ORed with an instruction encoding

◆ pio_encode_sideset_opt()

static uint pio_encode_sideset_opt	(	uint	sideset_bit_count,
		uint	value
	)

inlinestatic

Encode just the side set bits of an instruction (in optional -opt side set mode)

Note: This function does not return a valid instruction encoding; instead it returns an encoding of the side set bits suitable for ORing with the result of an encoding function for an actual instruction. Care should be taken when combining the results of this function with the results of pio_encode_delay as they share the same bits within the instruction encoding.

Parameters

sideset_bit_count	number of side set bits as would be specified via `.sideset <n> opt` in pioasm
value	the value to sideset on the pins

Returns: the side set bits to be ORed with an instruction encoding

◆ pio_encode_wait_gpio()

static uint pio_encode_wait_gpio	(	bool	polarity,
		uint	gpio
	)

inlinestatic

Encode a WAIT for GPIO pin instruction.

This is the equivalent of WAIT <polarity> GPIO <gpio>

Parameters

polarity	true for `WAIT 1`, false for `WAIT 0`
gpio	The real GPIO number 0-31

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_wait_irq()

static uint pio_encode_wait_irq	(	bool	polarity,
		bool	relative,
		uint	irq
	)

inlinestatic

Encode a WAIT for IRQ instruction.

This is the equivalent of WAIT <polarity> IRQ <irq> <relative>

Parameters

polarity	true for `WAIT 1`, false for `WAIT 0`
relative	true for a `WAIT IRQ <irq> REL`, false for regular `WAIT IRQ <irq>`
irq	the irq number 0-7

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

◆ pio_encode_wait_pin()

static uint pio_encode_wait_pin	(	bool	polarity,
		uint	pin
	)

inlinestatic

Encode a WAIT for pin instruction.

This is the equivalent of WAIT <polarity> PIN <pin>

Parameters

polarity	true for `WAIT 1`, false for `WAIT 0`
pin	The pin number 0-31 relative to the executing SM's input pin mapping

Returns: The instruction encoding with 0 delay and no side set value

See also: pio_encode_delay, pio_encode_sideset, pio_encode_sideset_opt

Enumerations

Functions

Detailed Description

Enumeration Type Documentation

◆ pio_src_dest

Function Documentation

◆ pio_encode_delay()

◆ pio_encode_in()

◆ pio_encode_irq_clear()

◆ pio_encode_irq_set()

◆ pio_encode_irq_wait()

◆ pio_encode_jmp()

◆ pio_encode_jmp_not_osre()

◆ pio_encode_jmp_not_x()

◆ pio_encode_jmp_not_y()

◆ pio_encode_jmp_pin()

◆ pio_encode_jmp_x_dec()

◆ pio_encode_jmp_x_ne_y()

◆ pio_encode_jmp_y_dec()

◆ pio_encode_mov()

◆ pio_encode_mov_not()

◆ pio_encode_mov_reverse()

◆ pio_encode_nop()

◆ pio_encode_out()

◆ pio_encode_pull()

◆ pio_encode_push()

◆ pio_encode_set()

◆ pio_encode_sideset()

◆ pio_encode_sideset_opt()

◆ pio_encode_wait_gpio()

◆ pio_encode_wait_irq()

◆ pio_encode_wait_pin()