1 /*
2 * Copyright (c) 2019 Nordic Semiconductor ASA
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include <zephyr/kernel.h>
8
9 #include <nrfx_gpiote.h>
10 #include <helpers/nrfx_gppi.h>
11
12 #include <zephyr/logging/log.h>
13 #include <zephyr/irq.h>
14 LOG_MODULE_REGISTER(nrfx_sample, LOG_LEVEL_INF);
15
16 #define INPUT_PIN NRF_DT_GPIOS_TO_PSEL(DT_ALIAS(sw0), gpios)
17 #define OUTPUT_PIN NRF_DT_GPIOS_TO_PSEL(DT_ALIAS(led0), gpios)
18
19 #define GPIOTE_INST NRF_DT_GPIOTE_INST(DT_ALIAS(sw0), gpios)
20 #define GPIOTE_NODE DT_NODELABEL(_CONCAT(gpiote, GPIOTE_INST))
21
22 BUILD_ASSERT(NRF_DT_GPIOTE_INST(DT_ALIAS(led0), gpios) == GPIOTE_INST,
23 "Both sw0 and led0 GPIOs must use the same GPIOTE instance");
24 BUILD_ASSERT(IS_ENABLED(_CONCAT(CONFIG_, _CONCAT(NRFX_GPIOTE, GPIOTE_INST))),
25 "NRFX_GPIOTE" STRINGIFY(GPIOTE_INST) " must be enabled in Kconfig");
26
27
button_handler(nrfx_gpiote_pin_t pin,nrfx_gpiote_trigger_t trigger,void * context)28 static void button_handler(nrfx_gpiote_pin_t pin,
29 nrfx_gpiote_trigger_t trigger,
30 void *context)
31 {
32 LOG_INF("GPIO input event callback");
33 }
34
main(void)35 int main(void)
36 {
37 LOG_INF("nrfx_gpiote sample on %s", CONFIG_BOARD);
38
39 nrfx_err_t err;
40 uint8_t in_channel, out_channel;
41 uint8_t ppi_channel;
42 const nrfx_gpiote_t gpiote = NRFX_GPIOTE_INSTANCE(GPIOTE_INST);
43
44 /* Connect GPIOTE instance IRQ to irq handler */
45 IRQ_CONNECT(DT_IRQN(GPIOTE_NODE), DT_IRQ(GPIOTE_NODE, priority), nrfx_isr,
46 NRFX_CONCAT(nrfx_gpiote_, GPIOTE_INST, _irq_handler), 0);
47
48 /* Initialize GPIOTE (the interrupt priority passed as the parameter
49 * here is ignored, see nrfx_glue.h).
50 */
51 err = nrfx_gpiote_init(&gpiote, 0);
52 if (err != NRFX_SUCCESS) {
53 LOG_ERR("nrfx_gpiote_init error: 0x%08X", err);
54 return 0;
55 }
56
57 err = nrfx_gpiote_channel_alloc(&gpiote, &in_channel);
58 if (err != NRFX_SUCCESS) {
59 LOG_ERR("Failed to allocate in_channel, error: 0x%08X", err);
60 return 0;
61 }
62
63 err = nrfx_gpiote_channel_alloc(&gpiote, &out_channel);
64 if (err != NRFX_SUCCESS) {
65 LOG_ERR("Failed to allocate out_channel, error: 0x%08X", err);
66 return 0;
67 }
68
69 /* Initialize input pin to generate event on high to low transition
70 * (falling edge) and call button_handler()
71 */
72 static const nrf_gpio_pin_pull_t pull_config = NRF_GPIO_PIN_PULLUP;
73 nrfx_gpiote_trigger_config_t trigger_config = {
74 .trigger = NRFX_GPIOTE_TRIGGER_HITOLO,
75 .p_in_channel = &in_channel,
76 };
77 static const nrfx_gpiote_handler_config_t handler_config = {
78 .handler = button_handler,
79 };
80 nrfx_gpiote_input_pin_config_t input_config = {
81 .p_pull_config = &pull_config,
82 .p_trigger_config = &trigger_config,
83 .p_handler_config = &handler_config
84 };
85
86 err = nrfx_gpiote_input_configure(&gpiote, INPUT_PIN, &input_config);
87
88 if (err != NRFX_SUCCESS) {
89 LOG_ERR("nrfx_gpiote_input_configure error: 0x%08X", err);
90 return 0;
91 }
92
93 /* Initialize output pin. SET task will turn the LED on,
94 * CLR will turn it off and OUT will toggle it.
95 */
96 static const nrfx_gpiote_output_config_t output_config = {
97 .drive = NRF_GPIO_PIN_S0S1,
98 .input_connect = NRF_GPIO_PIN_INPUT_DISCONNECT,
99 .pull = NRF_GPIO_PIN_NOPULL,
100 };
101 const nrfx_gpiote_task_config_t task_config = {
102 .task_ch = out_channel,
103 .polarity = NRF_GPIOTE_POLARITY_TOGGLE,
104 .init_val = 1,
105 };
106 err = nrfx_gpiote_output_configure(&gpiote, OUTPUT_PIN,
107 &output_config,
108 &task_config);
109 if (err != NRFX_SUCCESS) {
110 LOG_ERR("nrfx_gpiote_output_configure error: 0x%08X", err);
111 return 0;
112 }
113
114 nrfx_gpiote_trigger_enable(&gpiote, INPUT_PIN, true);
115 nrfx_gpiote_out_task_enable(&gpiote, OUTPUT_PIN);
116
117 LOG_INF("nrfx_gpiote initialized");
118
119 /* Allocate a (D)PPI channel. */
120 err = nrfx_gppi_channel_alloc(&ppi_channel);
121 if (err != NRFX_SUCCESS) {
122 LOG_ERR("nrfx_gppi_channel_alloc error: 0x%08X", err);
123 return 0;
124 }
125
126 /* Configure endpoints of the channel so that the input pin event is
127 * connected with the output pin OUT task. This means that each time
128 * the button is pressed, the LED pin will be toggled.
129 */
130 nrfx_gppi_channel_endpoints_setup(ppi_channel,
131 nrfx_gpiote_in_event_address_get(&gpiote, INPUT_PIN),
132 nrfx_gpiote_out_task_address_get(&gpiote, OUTPUT_PIN));
133
134 /* Enable the channel. */
135 nrfx_gppi_channels_enable(BIT(ppi_channel));
136
137 LOG_INF("(D)PPI configured, leaving main()");
138 return 0;
139 }
140
