Loading...
Searching...
No Matches
gpio_ll.h
Go to the documentation of this file.
1/*
2 * Copyright (C) 2020 Gunar Schorcht
3 * 2021 Otto-von-Guericke-Universität Magdeburg
4 *
5 * This file is subject to the terms and conditions of the GNU Lesser
6 * General Public License v2.1. See the file LICENSE in the top level
7 * directory for more details.
8 */
9
10#pragma once
11
71#include <assert.h>
72#include <stdbool.h>
73#include <stdint.h>
74
75#include "architecture.h"
76#include "periph/gpio.h"
77#include "periph_cpu.h"
78
79#ifdef __cplusplus
80extern "C" {
81#endif
82
86typedef uintptr_t gpio_port_t;
87
88#if !defined(GPIO_PORT_UNDEF) || defined(DOXYGEN)
92#define GPIO_PORT_UNDEF UINTPTR_MAX
93#endif
94
95#if defined(DOXYGEN)
105# define GPIO_PORT_NUMBERING_ALPHABETIC implementation_specific
106#endif
107
108
109#ifdef DOXYGEN
121#define GPIO_PORT_0 implementation_specific
122
136
151#endif /* DOXYGEN */
152
153#if !defined(HAVE_GPIO_STATE_T) || defined(DOXYGEN)
243#endif
244
245#if !defined(HAVE_GPIO_PULL_T) || defined(DOXYGEN)
256#endif
257
258#if !defined(HAVE_GPIO_PULL_STRENGTH_T) || defined(DOXYGEN)
273#endif
274
285#define GPIO_PULL_NUMOF (1U + (GPIO_PULL_WEAKEST != GPIO_PULL_WEAK) \
286 + (GPIO_PULL_WEAK != GPIO_PULL_STRONG) \
287 + (GPIO_PULL_STRONG != GPIO_PULL_STRONGEST))
288
289#if !defined(HAVE_GPIO_DRIVE_STRENGTH_T) || defined(DOXYGEN)
304#endif
305
314#define GPIO_DRIVE_NUMOF (1U + (GPIO_DRIVE_WEAKEST != GPIO_DRIVE_WEAK) \
315 + (GPIO_DRIVE_WEAK != GPIO_DRIVE_STRONG) \
316 + (GPIO_DRIVE_STRONG != GPIO_DRIVE_STRONGEST))
317
318#if !defined(HAVE_GPIO_SLEW_T) || defined(DOXYGEN)
339#endif
340
349#define GPIO_SLEW_NUMOF (1U + (GPIO_SLEW_SLOWEST != GPIO_SLEW_SLOW) \
350 + (GPIO_SLEW_SLOW != GPIO_SLEW_FAST) \
351 + (GPIO_SLEW_FAST != GPIO_SLEW_FASTEST))
352
371 uint8_t bits;
372 struct {
395 uint8_t : 2;
396 };
397};
398
399#if !defined(HAVE_GPIO_CONF_T) && !defined(DOXYGEN)
400typedef union gpio_conf_minimal gpio_conf_t;
401#endif
402
403#ifdef DOXYGEN
415typedef /* implementation specific */ gpio_conf_t;
416#endif
417
418#ifndef __cplusplus
441static const gpio_conf_t gpio_ll_in = {
442 .state = GPIO_INPUT,
443 .pull = GPIO_FLOATING,
444};
445
451 .state = GPIO_INPUT,
452 .pull = GPIO_PULL_DOWN,
453};
454
460 .state = GPIO_INPUT,
461 .pull = GPIO_PULL_UP,
462};
463
475 .state = GPIO_INPUT,
476 .pull = GPIO_PULL_KEEP,
477};
478
484static const gpio_conf_t gpio_ll_out = {
485 .state = GPIO_OUTPUT_PUSH_PULL,
486 .initial_value = false,
487};
488
495static const gpio_conf_t gpio_ll_od = {
496 .state = GPIO_OUTPUT_OPEN_DRAIN,
497 .pull = GPIO_FLOATING,
498 .initial_value = true,
499};
500
509 .state = GPIO_OUTPUT_OPEN_DRAIN,
510 .pull = GPIO_PULL_UP,
511 .initial_value = true,
512};
514#endif
515
523static inline bool is_gpio_port_num_valid(uint_fast8_t num);
524
562int gpio_ll_init(gpio_port_t port, uint8_t pin, gpio_conf_t conf);
563
579
589
595
611static inline uword_t gpio_ll_read(gpio_port_t port);
612
629
645static inline void gpio_ll_set(gpio_port_t port, uword_t mask);
646
662static inline void gpio_ll_clear(gpio_port_t port, uword_t mask);
663
679static inline void gpio_ll_toggle(gpio_port_t port, uword_t mask);
680
681#if defined(DOXYGEN) || !defined(HAVE_GPIO_LL_PREPARE_WRITE_ALL_PINS)
705 uword_t value)
706{
707 (void)port;
708 return value;
709}
710#endif
711
712#if defined(DOXYGEN) || !defined(HAVE_GPIO_LL_PREPARE_WRITE)
727 uword_t value)
728{
729 return value | (gpio_ll_read_output(port) & (~mask));
730}
731#endif
732
733#if defined(DOXYGEN) || !defined(HAVE_GPIO_LL_PREPARE_SWITCH_DIR)
743{
744 return mask;
745}
746#endif
747
758static inline void gpio_ll_switch_dir_output(gpio_port_t port, uword_t pins);
759
778static inline void gpio_ll_switch_dir_input(gpio_port_t port, uword_t pins);
779
821static inline void gpio_ll_write(gpio_port_t port, uword_t state);
822
827
831static inline uint8_t gpio_get_pin_num(gpio_t pin);
832
844static inline gpio_port_t gpio_port_pack_addr(void *addr);
845
858static inline void * gpio_port_unpack_addr(gpio_port_t port);
859
860#ifndef DOXYGEN
861#if !MODULE_PERIPH_GPIO_LL_SWITCH_DIR
862static inline void gpio_ll_switch_dir_output(gpio_port_t port, uword_t outputs)
863{
864 (void)port;
865 (void)outputs;
866 /* Hack: If this function is only used guarded by some
867 *
868 * if (IS_USED(MODULE_PERIPH_GPIO_LL_SWITCH_DIR)) {
869 * ...
870 * }
871 *
872 * as intended, all calls to the following fake function will be optimized
873 * due to the elimination of dead branches. If used incorrectly, a linking
874 * failure will be the result. The error message will not be ideal, but a
875 * compile time error is much better than a runtime error.
876 */
877 extern void gpio_ll_switch_dir_output_used_but_feature_gpio_ll_switch_dir_is_not_provided(void);
878 gpio_ll_switch_dir_output_used_but_feature_gpio_ll_switch_dir_is_not_provided();
879}
880
881static inline void gpio_ll_switch_dir_input(gpio_port_t port, uword_t inputs)
882{
883 (void)port;
884 (void)inputs;
885 /* Same hack as above */
886 extern void gpio_ll_switch_dir_input_used_but_feature_gpio_ll_switch_dir_is_not_provided(void);
887 gpio_ll_switch_dir_input_used_but_feature_gpio_ll_switch_dir_is_not_provided();
888}
889
890#endif /* !MODULE_PERIPH_GPIO_LL_SWITCH_DIR */
891#endif /* !DOXYGEN */
892
893#ifdef __cplusplus
894}
895#endif
896
897/* the hardware specific implementation relies on the types such as gpio_port_t
898 * to be provided */
899#include "gpio_ll_arch.h" /* IWYU pragma: export */
900
901#if !defined(DOXYGEN) && !defined(GPIO_PORT_NUMBERING_ALPHABETIC)
902# define GPIO_PORT_NUMBERING_ALPHABETIC 0
903#endif
904
909#if defined(GPIO_PORT_0) || defined(DOXYGEN)
913# define GPIO_PORT_A GPIO_PORT_0
914#endif
915#if defined(GPIO_PORT_1) || defined(DOXYGEN)
919# define GPIO_PORT_B GPIO_PORT_1
920#endif
921#if defined(GPIO_PORT_2) || defined(DOXYGEN)
925# define GPIO_PORT_C GPIO_PORT_2
926#endif
927#if defined(GPIO_PORT_3) || defined(DOXYGEN)
931# define GPIO_PORT_D GPIO_PORT_3
932#endif
933#if defined(GPIO_PORT_4) || defined(DOXYGEN)
937# define GPIO_PORT_E GPIO_PORT_4
938#endif
939#if defined(GPIO_PORT_5) || defined(DOXYGEN)
943# define GPIO_PORT_F GPIO_PORT_5
944#endif
945#if defined(GPIO_PORT_6) || defined(DOXYGEN)
949# define GPIO_PORT_G GPIO_PORT_6
950#endif
951#if defined(GPIO_PORT_7) || defined(DOXYGEN)
955# define GPIO_PORT_H GPIO_PORT_7
956#endif
957#if defined(GPIO_PORT_8) || defined(DOXYGEN)
961# define GPIO_PORT_I GPIO_PORT_8
962#endif
963#if defined(GPIO_PORT_9) || defined(DOXYGEN)
967# define GPIO_PORT_J GPIO_PORT_9
968#endif
969#if defined(GPIO_PORT_10) || defined(DOXYGEN)
973# define GPIO_PORT_K GPIO_PORT_10
974#endif
975#if defined(GPIO_PORT_11) || defined(DOXYGEN)
979# define GPIO_PORT_L GPIO_PORT_11
980#endif
981#if defined(GPIO_PORT_12) || defined(DOXYGEN)
985# define GPIO_PORT_M GPIO_PORT_12
986#endif
987#if defined(GPIO_PORT_13) || defined(DOXYGEN)
991# define GPIO_PORT_N GPIO_PORT_13
992#endif
993#if defined(GPIO_PORT_14) || defined(DOXYGEN)
997# define GPIO_PORT_O GPIO_PORT_14
998#endif
999#if defined(GPIO_PORT_15) || defined(DOXYGEN)
1003# define GPIO_PORT_P GPIO_PORT_15
1004#endif
Platform-independent access to architecture details.
POSIX.1-2008 compliant version of the assert macro.
Low-level GPIO peripheral driver interface definitions.
static const gpio_conf_t gpio_ll_in_pk
A standard configuration for a generic input pin with pull resistor to keep signal at bus level.
Definition gpio_ll.h:474
static uint8_t gpio_get_pin_num(gpio_t pin)
Extract the pin number from a gpio_t
static void gpio_ll_set(gpio_port_t port, uword_t mask)
Perform an reg |= mask operation on the I/O register of the port.
gpio_pull_t
Enumeration of pull resistor configurations.
Definition gpio_ll.h:249
gpio_pull_strength_t
Enumeration of pull resistor values.
Definition gpio_ll.h:267
static const gpio_conf_t gpio_ll_in_pd
A standard configuration for a generic input pin with pull down resistor.
Definition gpio_ll.h:450
static const gpio_conf_t gpio_ll_out
A standard configuration for a generic push-pull output pin.
Definition gpio_ll.h:484
gpio_state_t
Enumeration of GPIO states (direction)
Definition gpio_ll.h:157
gpio_port_t gpio_port(uword_t num)
Get the gpio_port_t value of the port number num.
gpio_slew_t
Enumeration of slew rate settings.
Definition gpio_ll.h:331
int gpio_ll_init(gpio_port_t port, uint8_t pin, gpio_conf_t conf)
Initialize the given GPIO pin as specified.
static uword_t gpio_ll_prepare_write(gpio_port_t port, uword_t mask, uword_t value)
Helper to use gpio_ll_write side-effect free.
Definition gpio_ll.h:726
static gpio_port_t gpio_port_pack_addr(void *addr)
Pack a pointer into a gpio_port_t.
static void gpio_ll_switch_dir_output(gpio_port_t port, uword_t pins)
Turn GPIO pins specified by pins (obtained from gpio_ll_prepare_switch_dir) to outputs.
gpio_conf_t gpio_ll_query_conf(gpio_port_t port, uint8_t pin)
Retrieve the current configuration of a GPIO pin.
void gpio_ll_print_conf_common(const gpio_conf_t conf)
INTERNAL, use gpio_ll_print_conf instead.
gpio_drive_strength_t
Enumeration of drive strength options.
Definition gpio_ll.h:298
static const gpio_conf_t gpio_ll_in_pu
A standard configuration for a generic input pin with pull up resistor.
Definition gpio_ll.h:459
static void gpio_ll_switch_dir_input(gpio_port_t port, uword_t pins)
Turn GPIO pins specified by pins (obtained from gpio_ll_prepare_switch_dir) to inputs.
static uword_t gpio_ll_read(gpio_port_t port)
Get the current input value of all GPIO pins of the given port as bitmask.
static gpio_port_t gpio_get_port(gpio_t pin)
Extract the gpio_port_t from a gpio_t
static uword_t gpio_ll_prepare_write_all_outputs(gpio_port_t port, uword_t value)
Same as gpio_ll_prepare_write(port, UWORD_MAX, value), but faster.
Definition gpio_ll.h:704
typedef gpio_conf_t
GPIO pin configuration.
Definition gpio_ll.h:415
static const gpio_conf_t gpio_ll_in
A standard configuration for a generic floating input pin.
Definition gpio_ll.h:441
uword_t gpio_port_num(gpio_port_t port)
Get the number of the GPIO port port refers to.
static uword_t gpio_ll_prepare_switch_dir(uword_t mask)
Prepare bitmask for use with gpio_ll_switch_dir_output and gpio_ll_switch_dir_input.
Definition gpio_ll.h:742
static const gpio_conf_t gpio_ll_od_pu
A standard configuration for a generic open drain output with pull up.
Definition gpio_ll.h:508
static void * gpio_port_unpack_addr(gpio_port_t port)
Extract a data pointer that was packed by gpio_port_pack_addr.
static bool is_gpio_port_num_valid(uint_fast8_t num)
Check if the given number is a valid argument for gpio_port.
static uword_t gpio_ll_read_output(gpio_port_t port)
Get the current output value of all GPIO pins of the given port as bitmask.
static void gpio_ll_clear(gpio_port_t port, uword_t mask)
Perform an reg &= ~mask operation on the I/O register of the port.
static void gpio_ll_toggle(gpio_port_t port, uword_t mask)
Perform an reg ^= mask operation on the I/O register of the port.
static void gpio_ll_write(gpio_port_t port, uword_t state)
Perform a masked write operation on the I/O register of the port.
static const gpio_conf_t gpio_ll_od
A standard configuration for a generic floating open drain output.
Definition gpio_ll.h:495
uintptr_t gpio_port_t
GPIO port type.
Definition gpio_ll.h:86
void gpio_ll_print_conf(const gpio_conf_t conf)
Utility function to print a given GPIO configuration to stdio.
@ GPIO_FLOATING
No pull ups nor pull downs enabled.
Definition gpio_ll.h:250
@ GPIO_PULL_KEEP
Keep the signal at current logic level with pull up/down resistors.
Definition gpio_ll.h:253
@ GPIO_PULL_DOWN
Pull down resistor enabled.
Definition gpio_ll.h:252
@ GPIO_PULL_UP
Pull up resistor enabled.
Definition gpio_ll.h:251
@ GPIO_PULL_WEAKEST
Use the weakest (highest Ohm value) resistor.
Definition gpio_ll.h:268
@ GPIO_PULL_WEAK
Use a weak pull resistor.
Definition gpio_ll.h:269
@ GPIO_PULL_STRONG
Use a strong pull resistor.
Definition gpio_ll.h:270
@ GPIO_PULL_STRONGEST
Use the strongest pull resistor.
Definition gpio_ll.h:271
@ GPIO_OUTPUT_OPEN_SOURCE
Use pin as output in open emitter configuration.
Definition gpio_ll.h:194
@ GPIO_USED_BY_PERIPHERAL
The GPIO pin is used by a peripheral.
Definition gpio_ll.h:213
@ GPIO_OUTPUT_OPEN_DRAIN
Use pin as output in open collector configuration.
Definition gpio_ll.h:181
@ GPIO_OUTPUT_PUSH_PULL
Use pin as output in push-pull configuration.
Definition gpio_ll.h:168
@ GPIO_DISCONNECT
Disconnect pin from all peripherals.
Definition gpio_ll.h:241
@ GPIO_INPUT
Use pin as input.
Definition gpio_ll.h:200
@ GPIO_SLEW_SLOWEST
let the output voltage level rise/fall as slow as possible
Definition gpio_ll.h:332
@ GPIO_SLEW_FAST
let the output voltage level rise/fall fast
Definition gpio_ll.h:335
@ GPIO_SLEW_SLOW
let the output voltage level rise/fall slowly
Definition gpio_ll.h:334
@ GPIO_SLEW_FASTEST
let the output voltage level rise/fall as fast as possible
Definition gpio_ll.h:336
@ GPIO_DRIVE_STRONG
Use a strong drive strength.
Definition gpio_ll.h:301
@ GPIO_DRIVE_WEAK
Use a weak drive strength.
Definition gpio_ll.h:300
@ GPIO_DRIVE_STRONGEST
Use the strongest drive strength.
Definition gpio_ll.h:302
@ GPIO_DRIVE_WEAKEST
Use the weakest drive strength.
Definition gpio_ll.h:299
uint16_t gpio_t
GPIO type identifier.
Definition periph_cpu.h:117
uint< NUM > _t uword_t
Word sized unsigned integer.
Public members of gpio_conf_t
Definition gpio_ll.h:370
uint8_t bits
The raw bits of the configuration.
Definition gpio_ll.h:371
gpio_pull_t pull
Pull resistor configuration.
Definition gpio_ll.h:380
bool initial_value
Initial value of the output.
Definition gpio_ll.h:394
gpio_state_t state
State of the pin.
Definition gpio_ll.h:376