Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_NORDIC/TARGET_NRF5/gpio_api.c@1:3deb71413561, 2017-07-20 (annotated)

Committer:
xuaner
Date:
Thu Jul 20 14:26:57 2017 +0000
Revision:
1:3deb71413561
Parent:
0:f269e3021894 
mbed_os

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2006-2013 ARM Limited
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 5 * you may not use this file except in compliance with the License.
elessair 0:f269e3021894 6 * You may obtain a copy of the License at
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 11 * distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 13 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 14 * limitations under the License.
elessair 0:f269e3021894 15 */
elessair 0:f269e3021894 16 #include "mbed_assert.h"
elessair 0:f269e3021894 17 #include "gpio_api.h"
elessair 0:f269e3021894 18 #include "gpio_irq_api.h"
elessair 0:f269e3021894 19 #include "pinmap.h"
elessair 0:f269e3021894 20 #include "nrf_drv_gpiote.h"
elessair 0:f269e3021894 21
elessair 0:f269e3021894 22
elessair 0:f269e3021894 23 #if defined(TARGET_MCU_NRF51822)
elessair 0:f269e3021894 24 #define GPIO_PIN_COUNT 31
elessair 0:f269e3021894 25 #else
elessair 0:f269e3021894 26 #define GPIO_PIN_COUNT 32
elessair 0:f269e3021894 27 #endif
elessair 0:f269e3021894 28
elessair 0:f269e3021894 29 typedef struct {
elessair 0:f269e3021894 30 bool used_as_gpio : 1;
elessair 0:f269e3021894 31 PinDirection direction : 1;
elessair 0:f269e3021894 32 bool init_high : 1;
elessair 0:f269e3021894 33 PinMode pull : 2;
elessair 0:f269e3021894 34 bool used_as_irq : 1;
elessair 0:f269e3021894 35 bool irq_fall : 1;
elessair 0:f269e3021894 36 bool irq_rise : 1;
elessair 0:f269e3021894 37 } gpio_cfg_t;
elessair 0:f269e3021894 38
elessair 0:f269e3021894 39 uint32_t m_gpio_initialized;
elessair 0:f269e3021894 40 gpio_cfg_t m_gpio_cfg[GPIO_PIN_COUNT];
elessair 0:f269e3021894 41
elessair 0:f269e3021894 42
elessair 0:f269e3021894 43 /***********
elessair 0:f269e3021894 44 GPIO IRQ
elessair 0:f269e3021894 45 ***********/
elessair 0:f269e3021894 46
elessair 0:f269e3021894 47 static gpio_irq_handler m_irq_handler;
elessair 0:f269e3021894 48 static uint32_t m_channel_ids[GPIO_PIN_COUNT] = {0};
elessair 0:f269e3021894 49 uint32_t m_gpio_irq_enabled;
elessair 0:f269e3021894 50
elessair 0:f269e3021894 51
elessair 0:f269e3021894 52 static void gpiote_irq_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
elessair 0:f269e3021894 53 {
elessair 0:f269e3021894 54 nrf_gpio_pin_sense_t sense = nrf_gpio_pin_sense_get(pin);
elessair 0:f269e3021894 55 gpio_irq_event event = (sense == NRF_GPIO_PIN_SENSE_LOW) ? IRQ_RISE : IRQ_FALL;
elessair 0:f269e3021894 56
elessair 0:f269e3021894 57 if (m_gpio_irq_enabled & (1UL << pin)) {
elessair 0:f269e3021894 58 if (((event == IRQ_RISE) && m_gpio_cfg[pin].irq_rise)
elessair 0:f269e3021894 59 || ((event == IRQ_FALL) && m_gpio_cfg[pin].irq_fall)) {
elessair 0:f269e3021894 60 m_irq_handler(m_channel_ids[pin], event);
elessair 0:f269e3021894 61 }
elessair 0:f269e3021894 62 }
elessair 0:f269e3021894 63 }
elessair 0:f269e3021894 64
elessair 0:f269e3021894 65
elessair 0:f269e3021894 66 void gpio_init(gpio_t *obj, PinName pin)
elessair 0:f269e3021894 67 {
elessair 0:f269e3021894 68 obj->pin = pin;
elessair 0:f269e3021894 69 if (pin == (PinName)NC) {
elessair 0:f269e3021894 70 return;
elessair 0:f269e3021894 71 }
elessair 0:f269e3021894 72 MBED_ASSERT((uint32_t)pin < GPIO_PIN_COUNT);
elessair 0:f269e3021894 73 (void) nrf_drv_gpiote_init();
elessair 0:f269e3021894 74
elessair 0:f269e3021894 75 m_gpio_cfg[obj->pin].used_as_gpio = true;
elessair 0:f269e3021894 76 }
elessair 0:f269e3021894 77
elessair 0:f269e3021894 78
elessair 0:f269e3021894 79 int gpio_read(gpio_t *obj)
elessair 0:f269e3021894 80 {
elessair 0:f269e3021894 81 MBED_ASSERT(obj->pin != (PinName)NC);
elessair 0:f269e3021894 82 if (m_gpio_cfg[obj->pin].direction == PIN_OUTPUT) {
elessair 0:f269e3021894 83 return ((NRF_GPIO->OUTSET & (1UL << obj->pin)) ? 1 : 0);
elessair 0:f269e3021894 84 } else {
elessair 0:f269e3021894 85 return nrf_gpio_pin_read(obj->pin);
elessair 0:f269e3021894 86 }
elessair 0:f269e3021894 87 }
elessair 0:f269e3021894 88
elessair 0:f269e3021894 89
elessair 0:f269e3021894 90 static void gpio_apply_config(uint8_t pin)
elessair 0:f269e3021894 91 {
elessair 0:f269e3021894 92 if (m_gpio_initialized & (1UL << pin)) {
elessair 0:f269e3021894 93 if ((m_gpio_cfg[pin].direction == PIN_OUTPUT) && (!m_gpio_cfg[pin].used_as_irq)) {
elessair 0:f269e3021894 94 nrf_drv_gpiote_out_uninit(pin);
elessair 0:f269e3021894 95 }
elessair 0:f269e3021894 96 else {
elessair 0:f269e3021894 97 nrf_drv_gpiote_in_uninit(pin);
elessair 0:f269e3021894 98 }
elessair 0:f269e3021894 99 }
elessair 0:f269e3021894 100
elessair 0:f269e3021894 101 if (m_gpio_cfg[pin].used_as_gpio || m_gpio_cfg[pin].used_as_irq) {
elessair 0:f269e3021894 102 if ((m_gpio_cfg[pin].direction == PIN_INPUT)
elessair 0:f269e3021894 103 || (m_gpio_cfg[pin].used_as_irq)) {
elessair 0:f269e3021894 104 //Configure as input.
elessair 0:f269e3021894 105 nrf_drv_gpiote_in_config_t cfg;
elessair 0:f269e3021894 106
elessair 0:f269e3021894 107 cfg.hi_accuracy = false;
elessair 0:f269e3021894 108 cfg.is_watcher = false;
elessair 0:f269e3021894 109 cfg.sense = NRF_GPIOTE_POLARITY_TOGGLE;
elessair 0:f269e3021894 110 if (m_gpio_cfg[pin].used_as_irq) {
elessair 0:f269e3021894 111 cfg.pull = NRF_GPIO_PIN_PULLUP;
elessair 0:f269e3021894 112 nrf_drv_gpiote_in_init(pin, &cfg, gpiote_irq_handler);
elessair 0:f269e3021894 113 if ((m_gpio_irq_enabled & (1 << pin))
elessair 0:f269e3021894 114 && (m_gpio_cfg[pin].irq_rise || m_gpio_cfg[pin].irq_fall))
elessair 0:f269e3021894 115 {
elessair 0:f269e3021894 116 nrf_drv_gpiote_in_event_enable(pin, true);
elessair 0:f269e3021894 117 }
elessair 0:f269e3021894 118 }
elessair 0:f269e3021894 119 else {
elessair 0:f269e3021894 120 switch(m_gpio_cfg[pin].pull) {
elessair 0:f269e3021894 121 case PullUp:
elessair 0:f269e3021894 122 cfg.pull = NRF_GPIO_PIN_PULLUP;
elessair 0:f269e3021894 123 break;
elessair 0:f269e3021894 124 case PullDown:
elessair 0:f269e3021894 125 cfg.pull = NRF_GPIO_PIN_PULLDOWN;
elessair 0:f269e3021894 126 break;
elessair 0:f269e3021894 127 default:
elessair 0:f269e3021894 128 cfg.pull = NRF_GPIO_PIN_NOPULL;
elessair 0:f269e3021894 129 break;
elessair 0:f269e3021894 130 }
elessair 0:f269e3021894 131 nrf_drv_gpiote_in_init(pin, &cfg, NULL);
elessair 0:f269e3021894 132 }
elessair 0:f269e3021894 133 }
elessair 0:f269e3021894 134 else {
elessair 0:f269e3021894 135 // Configure as output.
elessair 0:f269e3021894 136 nrf_drv_gpiote_out_config_t cfg = GPIOTE_CONFIG_OUT_SIMPLE(m_gpio_cfg[pin].init_high);
elessair 0:f269e3021894 137 nrf_drv_gpiote_out_init(pin, &cfg);
elessair 0:f269e3021894 138 }
elessair 0:f269e3021894 139 m_gpio_initialized |= (1UL << pin);
elessair 0:f269e3021894 140 }
elessair 0:f269e3021894 141 else {
elessair 0:f269e3021894 142 m_gpio_initialized &= ~(1UL << pin);
elessair 0:f269e3021894 143 }
elessair 0:f269e3021894 144 }
elessair 0:f269e3021894 145
elessair 0:f269e3021894 146
elessair 0:f269e3021894 147 void gpio_mode(gpio_t *obj, PinMode mode)
elessair 0:f269e3021894 148 {
elessair 0:f269e3021894 149 MBED_ASSERT(obj->pin <= GPIO_PIN_COUNT);
elessair 0:f269e3021894 150 m_gpio_cfg[obj->pin].pull = mode;
elessair 0:f269e3021894 151 gpio_apply_config(obj->pin);
elessair 0:f269e3021894 152 }
elessair 0:f269e3021894 153
elessair 0:f269e3021894 154
elessair 0:f269e3021894 155 void gpio_dir(gpio_t *obj, PinDirection direction)
elessair 0:f269e3021894 156 {
elessair 0:f269e3021894 157 MBED_ASSERT(obj->pin <= GPIO_PIN_COUNT);
elessair 0:f269e3021894 158 m_gpio_cfg[obj->pin].direction = direction;
elessair 0:f269e3021894 159 gpio_apply_config(obj->pin);
elessair 0:f269e3021894 160 }
elessair 0:f269e3021894 161
elessair 0:f269e3021894 162
elessair 0:f269e3021894 163 /***********
elessair 0:f269e3021894 164 GPIO IRQ
elessair 0:f269e3021894 165 ***********/
elessair 0:f269e3021894 166
elessair 0:f269e3021894 167 int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id)
elessair 0:f269e3021894 168 {
elessair 0:f269e3021894 169 if (pin == NC) {
elessair 0:f269e3021894 170 return -1;
elessair 0:f269e3021894 171 }
elessair 0:f269e3021894 172 MBED_ASSERT((uint32_t)pin < GPIO_PIN_COUNT);
elessair 0:f269e3021894 173 (void) nrf_drv_gpiote_init();
elessair 0:f269e3021894 174
elessair 0:f269e3021894 175 m_gpio_cfg[pin].used_as_irq = true;
elessair 0:f269e3021894 176 m_channel_ids[pin] = id;
elessair 0:f269e3021894 177 obj->ch = pin;
elessair 0:f269e3021894 178 m_irq_handler = handler;
elessair 0:f269e3021894 179 m_channel_ids[pin] = id;
elessair 0:f269e3021894 180
elessair 0:f269e3021894 181 gpio_apply_config(pin);
elessair 0:f269e3021894 182 return 1;
elessair 0:f269e3021894 183 }
elessair 0:f269e3021894 184
elessair 0:f269e3021894 185
elessair 0:f269e3021894 186 void gpio_irq_free(gpio_irq_t *obj)
elessair 0:f269e3021894 187 {
elessair 0:f269e3021894 188 nrf_drv_gpiote_in_uninit(obj->ch);
elessair 0:f269e3021894 189 m_gpio_cfg[obj->ch].used_as_irq = false;
elessair 0:f269e3021894 190 m_channel_ids[obj->ch] = 0;
elessair 0:f269e3021894 191
elessair 0:f269e3021894 192 gpio_apply_config(obj->ch);
elessair 0:f269e3021894 193 }
elessair 0:f269e3021894 194
elessair 0:f269e3021894 195
elessair 0:f269e3021894 196 void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable)
elessair 0:f269e3021894 197 {
elessair 0:f269e3021894 198 gpio_cfg_t* cfg = &m_gpio_cfg[obj->ch];
elessair 0:f269e3021894 199 bool irq_enabled_before =
elessair 0:f269e3021894 200 (m_gpio_irq_enabled & (1 << obj->ch)) &&
elessair 0:f269e3021894 201 (cfg->irq_rise || cfg->irq_fall);
elessair 0:f269e3021894 202
elessair 0:f269e3021894 203 if (event == IRQ_RISE) {
elessair 0:f269e3021894 204 cfg->irq_rise = enable ? true : false;
elessair 0:f269e3021894 205 }
elessair 0:f269e3021894 206 else if (event == IRQ_FALL) {
elessair 0:f269e3021894 207 cfg->irq_fall = enable ? true : false;
elessair 0:f269e3021894 208 }
elessair 0:f269e3021894 209
elessair 0:f269e3021894 210 bool irq_enabled_after = cfg->irq_rise || cfg->irq_fall;
elessair 0:f269e3021894 211
elessair 0:f269e3021894 212 if (irq_enabled_before != irq_enabled_after) {
elessair 0:f269e3021894 213 if (irq_enabled_after) {
elessair 0:f269e3021894 214 gpio_irq_enable(obj);
elessair 0:f269e3021894 215 } else {
elessair 0:f269e3021894 216 gpio_irq_disable(obj);
elessair 0:f269e3021894 217 }
elessair 0:f269e3021894 218 }
elessair 0:f269e3021894 219 }
elessair 0:f269e3021894 220
elessair 0:f269e3021894 221
elessair 0:f269e3021894 222 void gpio_irq_enable(gpio_irq_t *obj)
elessair 0:f269e3021894 223 {
elessair 0:f269e3021894 224 m_gpio_irq_enabled |= (1 << obj->ch);
elessair 0:f269e3021894 225 if (m_gpio_cfg[obj->ch].irq_rise || m_gpio_cfg[obj->ch].irq_fall) {
elessair 0:f269e3021894 226 nrf_drv_gpiote_in_event_enable(obj->ch, true);
elessair 0:f269e3021894 227 }
elessair 0:f269e3021894 228 }
elessair 0:f269e3021894 229
elessair 0:f269e3021894 230
elessair 0:f269e3021894 231 void gpio_irq_disable(gpio_irq_t *obj)
elessair 0:f269e3021894 232 {
elessair 0:f269e3021894 233 m_gpio_irq_enabled &= ~(1 << obj->ch);
elessair 0:f269e3021894 234 nrf_drv_gpiote_in_event_disable(obj->ch);
elessair 0:f269e3021894 235 }