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gpio_ll.h
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1/*
2 * SPDX-FileCopyrightText: 2020 Gunar Schorcht
3 * SPDX-FileCopyrightText: 2021 Otto-von-Guericke-Universität Magdeburg
4 * SPDX-License-Identifier: LGPL-2.1-only
5 */
6
7#pragma once
8
76
77#include <assert.h>
78#include <stdbool.h>
79#include <stdint.h>
80
81#include "architecture.h"
82#include "periph/gpio.h"
83#include "periph_cpu.h"
84
85#ifdef __cplusplus
86extern "C" {
87#endif
88
92typedef uintptr_t gpio_port_t;
93
94#if !defined(GPIO_PORT_UNDEF) || defined(DOXYGEN)
98#define GPIO_PORT_UNDEF UINTPTR_MAX
99#endif
100
101#if defined(DOXYGEN)
111# define GPIO_PORT_NUMBERING_ALPHABETIC implementation_specific
112#endif
113
114#ifdef DOXYGEN
126#define GPIO_PORT_0 implementation_specific
127
141
156#endif /* DOXYGEN */
157
158#if !defined(HAVE_GPIO_STATE_T) || defined(DOXYGEN)
248#endif
249
250#if !defined(HAVE_GPIO_PULL_T) || defined(DOXYGEN)
261#endif
262
263#if !defined(HAVE_GPIO_PULL_STRENGTH_T) || defined(DOXYGEN)
278#endif
279
290#define GPIO_PULL_NUMOF (1U + (GPIO_PULL_WEAKEST != GPIO_PULL_WEAK) \
291 + (GPIO_PULL_WEAK != GPIO_PULL_STRONG) \
292 + (GPIO_PULL_STRONG != GPIO_PULL_STRONGEST))
293
294#if !defined(HAVE_GPIO_DRIVE_STRENGTH_T) || defined(DOXYGEN)
309#endif
310
319#define GPIO_DRIVE_NUMOF (1U + (GPIO_DRIVE_WEAKEST != GPIO_DRIVE_WEAK) \
320 + (GPIO_DRIVE_WEAK != GPIO_DRIVE_STRONG) \
321 + (GPIO_DRIVE_STRONG != GPIO_DRIVE_STRONGEST))
322
323#if !defined(HAVE_GPIO_SLEW_T) || defined(DOXYGEN)
344#endif
345
354#define GPIO_SLEW_NUMOF (1U + (GPIO_SLEW_SLOWEST != GPIO_SLEW_SLOW) \
355 + (GPIO_SLEW_SLOW != GPIO_SLEW_FAST) \
356 + (GPIO_SLEW_FAST != GPIO_SLEW_FASTEST))
357
376 uint8_t bits;
377 struct {
400 uint8_t : 2;
401 };
402};
403
404#if !defined(HAVE_GPIO_CONF_T) && !defined(DOXYGEN)
405typedef union gpio_conf_minimal gpio_conf_t;
406#endif
407
408#ifdef DOXYGEN
420typedef /* implementation specific */ gpio_conf_t;
421#endif
422
423#ifndef __cplusplus
446static const gpio_conf_t gpio_ll_in = {
447 .state = GPIO_INPUT,
448 .pull = GPIO_FLOATING,
449};
450
456 .state = GPIO_INPUT,
457 .pull = GPIO_PULL_DOWN,
458};
459
465 .state = GPIO_INPUT,
466 .pull = GPIO_PULL_UP,
467};
468
480 .state = GPIO_INPUT,
481 .pull = GPIO_PULL_KEEP,
482};
483
489static const gpio_conf_t gpio_ll_out = {
490 .state = GPIO_OUTPUT_PUSH_PULL,
491 .initial_value = false,
492};
493
500static const gpio_conf_t gpio_ll_od = {
501 .state = GPIO_OUTPUT_OPEN_DRAIN,
502 .pull = GPIO_FLOATING,
503 .initial_value = true,
504};
505
514 .state = GPIO_OUTPUT_OPEN_DRAIN,
515 .pull = GPIO_PULL_UP,
516 .initial_value = true,
517};
518
519#endif
520
528static inline bool is_gpio_port_num_valid(uint_fast8_t num);
529
567int gpio_ll_init(gpio_port_t port, uint8_t pin, gpio_conf_t conf);
568
584
594
600
616static inline uword_t gpio_ll_read(gpio_port_t port);
617
634
650static inline void gpio_ll_set(gpio_port_t port, uword_t mask);
651
667static inline void gpio_ll_clear(gpio_port_t port, uword_t mask);
668
684static inline void gpio_ll_toggle(gpio_port_t port, uword_t mask);
685
686#if defined(DOXYGEN) || !defined(HAVE_GPIO_LL_PREPARE_WRITE_ALL_PINS)
710 uword_t value)
711{
712 (void)port;
713 return value;
714}
715#endif
716
717#if defined(DOXYGEN) || !defined(HAVE_GPIO_LL_PREPARE_WRITE)
732 uword_t value)
733{
734 return value | (gpio_ll_read_output(port) & (~mask));
735}
736#endif
737
738#if defined(DOXYGEN) || !defined(HAVE_GPIO_LL_PREPARE_SWITCH_DIR)
748{
749 return mask;
750}
751#endif
752
763static inline void gpio_ll_switch_dir_output(gpio_port_t port, uword_t pins);
764
783static inline void gpio_ll_switch_dir_input(gpio_port_t port, uword_t pins);
784
826static inline void gpio_ll_write(gpio_port_t port, uword_t state);
827
839static inline gpio_port_t gpio_get_port(gpio_t pin);
840
856static inline uint8_t gpio_get_pin_num(gpio_t pin);
857
869static inline gpio_port_t gpio_port_pack_addr(void *addr);
870
883static inline void * gpio_port_unpack_addr(gpio_port_t port);
884
885#ifndef DOXYGEN
886#if !MODULE_PERIPH_GPIO_LL_SWITCH_DIR
887static inline void gpio_ll_switch_dir_output(gpio_port_t port, uword_t outputs)
888{
889 (void)port;
890 (void)outputs;
891 /* Hack: If this function is only used guarded by some
892 *
893 * if (IS_USED(MODULE_PERIPH_GPIO_LL_SWITCH_DIR)) {
894 * ...
895 * }
896 *
897 * as intended, all calls to the following fake function will be optimized
898 * due to the elimination of dead branches. If used incorrectly, a linking
899 * failure will be the result. The error message will not be ideal, but a
900 * compile time error is much better than a runtime error.
901 */
902 extern void gpio_ll_switch_dir_output_used_but_feature_gpio_ll_switch_dir_is_not_provided(void);
903 gpio_ll_switch_dir_output_used_but_feature_gpio_ll_switch_dir_is_not_provided();
904}
905
906static inline void gpio_ll_switch_dir_input(gpio_port_t port, uword_t inputs)
907{
908 (void)port;
909 (void)inputs;
910 /* Same hack as above */
911 extern void gpio_ll_switch_dir_input_used_but_feature_gpio_ll_switch_dir_is_not_provided(void);
912 gpio_ll_switch_dir_input_used_but_feature_gpio_ll_switch_dir_is_not_provided();
913}
914
915#endif /* !MODULE_PERIPH_GPIO_LL_SWITCH_DIR */
916#endif /* !DOXYGEN */
917
918#ifdef __cplusplus
919}
920#endif
921
922/* the hardware specific implementation relies on the types such as gpio_port_t
923 * to be provided */
924#include "gpio_ll_arch.h" /* IWYU pragma: export */
925
926#if !defined(DOXYGEN) && !defined(GPIO_PORT_NUMBERING_ALPHABETIC)
927# define GPIO_PORT_NUMBERING_ALPHABETIC 0
928#endif
929
934#if defined(GPIO_PORT_0) || defined(DOXYGEN)
938# define GPIO_PORT_A GPIO_PORT_0
939#endif
940#if defined(GPIO_PORT_1) || defined(DOXYGEN)
944# define GPIO_PORT_B GPIO_PORT_1
945#endif
946#if defined(GPIO_PORT_2) || defined(DOXYGEN)
950# define GPIO_PORT_C GPIO_PORT_2
951#endif
952#if defined(GPIO_PORT_3) || defined(DOXYGEN)
956# define GPIO_PORT_D GPIO_PORT_3
957#endif
958#if defined(GPIO_PORT_4) || defined(DOXYGEN)
962# define GPIO_PORT_E GPIO_PORT_4
963#endif
964#if defined(GPIO_PORT_5) || defined(DOXYGEN)
968# define GPIO_PORT_F GPIO_PORT_5
969#endif
970#if defined(GPIO_PORT_6) || defined(DOXYGEN)
974# define GPIO_PORT_G GPIO_PORT_6
975#endif
976#if defined(GPIO_PORT_7) || defined(DOXYGEN)
980# define GPIO_PORT_H GPIO_PORT_7
981#endif
982#if defined(GPIO_PORT_8) || defined(DOXYGEN)
986# define GPIO_PORT_I GPIO_PORT_8
987#endif
988#if defined(GPIO_PORT_9) || defined(DOXYGEN)
992# define GPIO_PORT_J GPIO_PORT_9
993#endif
994#if defined(GPIO_PORT_10) || defined(DOXYGEN)
998# define GPIO_PORT_K GPIO_PORT_10
999#endif
1000#if defined(GPIO_PORT_11) || defined(DOXYGEN)
1004# define GPIO_PORT_L GPIO_PORT_11
1005#endif
1006#if defined(GPIO_PORT_12) || defined(DOXYGEN)
1010# define GPIO_PORT_M GPIO_PORT_12
1011#endif
1012#if defined(GPIO_PORT_13) || defined(DOXYGEN)
1016# define GPIO_PORT_N GPIO_PORT_13
1017#endif
1018#if defined(GPIO_PORT_14) || defined(DOXYGEN)
1022# define GPIO_PORT_O GPIO_PORT_14
1023#endif
1024#if defined(GPIO_PORT_15) || defined(DOXYGEN)
1028# define GPIO_PORT_P GPIO_PORT_15
1029#endif
1031
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:479
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:254
gpio_pull_strength_t
Enumeration of pull resistor values.
Definition gpio_ll.h:272
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:455
static const gpio_conf_t gpio_ll_out
A standard configuration for a generic push-pull output pin.
Definition gpio_ll.h:489
gpio_state_t
Enumeration of GPIO states (direction)
Definition gpio_ll.h:162
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:336
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:731
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:303
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:464
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:709
typedef gpio_conf_t
GPIO pin configuration.
Definition gpio_ll.h:420
static const gpio_conf_t gpio_ll_in
A standard configuration for a generic floating input pin.
Definition gpio_ll.h:446
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:747
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:513
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:500
uintptr_t gpio_port_t
GPIO port type.
Definition gpio_ll.h:92
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:255
@ GPIO_PULL_KEEP
Keep the signal at current logic level with pull up/down resistors.
Definition gpio_ll.h:258
@ GPIO_PULL_DOWN
Pull down resistor enabled.
Definition gpio_ll.h:257
@ GPIO_PULL_UP
Pull up resistor enabled.
Definition gpio_ll.h:256
@ GPIO_PULL_WEAKEST
Use the weakest (highest Ohm value) resistor.
Definition gpio_ll.h:273
@ GPIO_PULL_WEAK
Use a weak pull resistor.
Definition gpio_ll.h:274
@ GPIO_PULL_STRONG
Use a strong pull resistor.
Definition gpio_ll.h:275
@ GPIO_PULL_STRONGEST
Use the strongest pull resistor.
Definition gpio_ll.h:276
@ GPIO_OUTPUT_OPEN_SOURCE
Use pin as output in open emitter configuration.
Definition gpio_ll.h:199
@ GPIO_USED_BY_PERIPHERAL
The GPIO pin is used by a peripheral.
Definition gpio_ll.h:218
@ GPIO_OUTPUT_OPEN_DRAIN
Use pin as output in open collector configuration.
Definition gpio_ll.h:186
@ GPIO_OUTPUT_PUSH_PULL
Use pin as output in push-pull configuration.
Definition gpio_ll.h:173
@ GPIO_DISCONNECT
Disconnect pin from all peripherals.
Definition gpio_ll.h:246
@ GPIO_INPUT
Use pin as input.
Definition gpio_ll.h:205
@ GPIO_SLEW_SLOWEST
let the output voltage level rise/fall as slow as possible
Definition gpio_ll.h:337
@ GPIO_SLEW_FAST
let the output voltage level rise/fall fast
Definition gpio_ll.h:340
@ GPIO_SLEW_SLOW
let the output voltage level rise/fall slowly
Definition gpio_ll.h:339
@ GPIO_SLEW_FASTEST
let the output voltage level rise/fall as fast as possible
Definition gpio_ll.h:341
@ GPIO_DRIVE_STRONG
Use a strong drive strength.
Definition gpio_ll.h:306
@ GPIO_DRIVE_WEAK
Use a weak drive strength.
Definition gpio_ll.h:305
@ GPIO_DRIVE_STRONGEST
Use the strongest drive strength.
Definition gpio_ll.h:307
@ GPIO_DRIVE_WEAKEST
Use the weakest drive strength.
Definition gpio_ll.h:304
uint< NUM > _t uword_t
Word sized unsigned integer.
Public members of gpio_conf_t
Definition gpio_ll.h:375
uint8_t bits
The raw bits of the configuration.
Definition gpio_ll.h:376
gpio_pull_t pull
Pull resistor configuration.
Definition gpio_ll.h:385
bool initial_value
Initial value of the output.
Definition gpio_ll.h:399
gpio_state_t state
State of the pin.
Definition gpio_ll.h:381