pinmux.c File Reference

I/O Multiplexing Module (IOMM) basic support. More...

#include <bsp/tms570.h>
#include <bsp/tms570-pinmux.h>
#include <bsp/irq.h>

Functions
	RTEMS_STATIC_ASSERT (TMS570_PIN_CLEAR_RQ_MASK==TMS570_PIN_FNC_CLEAR<< TMS570_PIN_FNC_SHIFT, TMS570_PIN_CONFIG)
void	tms570_bsp_pin_set_function (int pin_num, int pin_fnc)
	select desired function of pin/ball More...
void	tms570_bsp_pin_clear_function (int pin_num, int pin_fnc)
	clear connection between pin and specified peripherals/function More...
void	tms570_bsp_pin_config_one (uint32_t pin_num_and_fnc)
	configure one pin according to its function specification More...
void	tms570_bsp_pinmmr_config (const uint32_t *pinmmr_values, int reg_start, int reg_count)
	configure block or whole pin multiplexer More...
void	tms570_pin_config_prepare (void)
	Prepares a pin configuration sequence. More...
void	tms570_pin_config_apply (uint32_t config)
	Applies a pin configuration. More...
void	tms570_pin_config_array_apply (const uint32_t *config, size_t count)
	Applies a pin configuration array. More...
void	tms570_pin_config_complete (void)
	Completes a pin configuration sequence.

Detailed Description

I/O Multiplexing Module (IOMM) basic support.

Function Documentation

tms570_bsp_pin_clear_function()

void tms570_bsp_pin_clear_function	(	int	pin_num,
		int	pin_fnc
	)

clear connection between pin and specified peripherals/function

This function switches off given connection and leaves rest of multiplexer setup intact.

Parameters

[in]	pin_num	pin/ball identifier (index into pinmux array)
[in]	pin_fnc	function number 0 .. 7, if value TMS570_PIN_FNC_AUTO is specified then pin function is extracted from pin_num argument

Return values

Void

tms570_bsp_pin_config_one()

void tms570_bsp_pin_config_one

(

uint32_t

pin_num_and_fnc

)

configure one pin according to its function specification

The function setups multiplexer to interconnect pin with specified function/peripheral. Predefined values for pins combined with function are in a format TMS570_BALL_ column row function (for example TMS570_BALL_W3_SCIRX). If the function can be connected to more pins then specification includes infomation which allows to disconnect alternative pin to peripheral input connection or switch input multiplexer to right pin.

Parameters

[in]

pin_num_and_fnc

pin function descriptor is build by macro TMS570_PIN_AND_FNC which takes pin/pinmmr specification build by TMS570_BALL_WITH_MMR and function index in output multiplexer. If the peripheral can be connected to other input alternative then actual pin description and alternative to disconnected/reconnect are combined together by TMS570_PIN_WITH_IN_ALT macro. If clear of alternative connection is required then flag TMS570_PIN_CLEAR_RQ_MASK is ored to alternative description.

Return values

Void

tms570_bsp_pin_set_function()

void tms570_bsp_pin_set_function	(	int	pin_num,
		int	pin_fnc
	)

select desired function of pin/ball

The function setups multiplexer to interconnect pin with specified function/peripheral. Pin number is index into pinmux entries array. Predefined values for pins are in a format TMS570_BALL_ column row (for example TMS570_BALL_N19). The multiplexer allows to interconnect one pin to multiple signal sources/sinks in the theory but it is usually bad choice. The function sets only specified function and clears all other connections.

Parameters

[in]	pin_num	pin/ball identifier (index into pinmux array),
[in]	pin_fnc	function number 0 .. 7, if value TMS570_PIN_FNC_AUTO is specified then pin function is extracted from pin_num argument

Return values

Void

tms570_bsp_pinmmr_config()

void tms570_bsp_pinmmr_config	(	const uint32_t *	pinmmr_values,
		int	reg_start,
		int	reg_count
	)

configure block or whole pin multiplexer

Function change multiplexer content. It is intended for initial chip setup and does not use locking. If complete reconfiguration is required at runtime then it is application responsibility to protect and serialize change with peripherals drivers and parallel calls

Parameters

[in]	pinmmr_values	pointer to array with required multiplexer setup
[in]	reg_start	starting register, this allows to configure non-consecutive registers groups found on some MCU family members
[in]	reg_count	number of words in initialization array to set to corresponding registers

Return values

Void

tms570_pin_config_apply()

void tms570_pin_config_apply

(

uint32_t

config

)

Applies a pin configuration.

This function can only be used if the pin configuration was prepared by tms570_pin_config_prepare().

Parameters

config

is the pin configuration defined by TMS570_PIN_AND_FNC() or TMS570_PIN_WITH_IN_ALT().

tms570_pin_config_array_apply()

void tms570_pin_config_array_apply	(	const uint32_t *	config,
		size_t	count
	)

Applies a pin configuration array.

This function can only be used if the pin configuration was prepared by tms570_pin_config_prepare().

Parameters

config	is the pin configuration array. Calls tms570_pin_config_apply() for each pin configuration in the array.
count	is the element count of the pin configuration array.

tms570_pin_config_prepare()

void tms570_pin_config_prepare

(

void

)

Prepares a pin configuration sequence.

Use tms570_pin_config_apply() to apply pin configurations. Use tms570_pin_config_complete() to complete the pin configuration sequence.