gpio.c File Reference

G4 GPIO public API implementation. More...

#include "common/phal_G4/gpio/gpio.h"
#include "common/phal_G4/gpio/gpio_priv.h"

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Functions
bool	PHAL_GPIO_init (PHAL_GPIO_InitConfig_t config[], size_t config_len)
	Initialize a set of GPIO pins from a configuration table.
bool	PHAL_GPIO_read (const GPIO_TypeDef *bank, uint8_t pin)
	Read the current input state of a pin.
void	PHAL_GPIO_write (GPIO_TypeDef *bank, uint8_t pin, bool value)
	Drive an output pin high or low.
void	PHAL_GPIO_toggle (GPIO_TypeDef *bank, uint8_t pin)
	Flip an output pin's current state.

Detailed Description

G4 GPIO public API implementation.

Author

Millan Kumar (kumar.nosp@m.798@.nosp@m.purdu.nosp@m.e.ed.nosp@m.u)

Function Documentation

PHAL_GPIO_init()

bool PHAL_GPIO_init	(	PHAL_GPIO_InitConfig_t	config[],
		size_t	config_len )

Initialize a set of GPIO pins from a configuration table.

Enables each pin's port clock, then configures mode, speed, drive type, pull, and alternate function per entry as applicable to that entry's PHAL_GPIO_PinType_t

Register fields that don't apply to a given type (ex: pull for an output pin) are left untouched.

When encountering an unknown bank, pin outside 0-15, or unrecognized type, stops and returns false. Already configured pins remain configured.

Parameters

config	Array of pin configurations
config_len	Number of entries in config

Returns

true if every entry was valid (bank, pin #, type) and configured; false otherwise

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PHAL_GPIO_read()

bool PHAL_GPIO_read	(	const GPIO_TypeDef *	bank,
		uint8_t	pin )

Read the current input state of a pin.

Parameters

bank	GPIO port
pin	Pin number, 0-15

Returns

true if the pin currently reads high

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PHAL_GPIO_toggle()

void PHAL_GPIO_toggle	(	GPIO_TypeDef *	bank,
		uint8_t	pin )

Flip an output pin's current state.

Parameters

bank	GPIO port
pin	Pin number, 0-15

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PHAL_GPIO_write()

void PHAL_GPIO_write	(	GPIO_TypeDef *	bank,
		uint8_t	pin,
		bool	value )

Drive an output pin high or low.

Safe to call from an ISR concurrently with other threads/etc touching other pins on the same port

Parameters

bank	GPIO port
pin	Pin number, 0-15
value	true to drive high, false to drive low

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