Flotsam / mbed-modifed

Modified version of the mbed library for use with the Nucleo boards.

Dependents:   EEPROMWrite Full-Project

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_STM32F0/gpio_irq_api.c@630:825f75ca301e, 2015-09-28 (annotated)

Committer:
mbed_official
Date:
Mon Sep 28 10:45:10 2015 +0100
Revision:
630:825f75ca301e
Parent:
469:fc4922e0c183 
Synchronized with git revision 54fbe4144faf309c37205a5d39fa665daa919f10



Full URL: https://github.com/mbedmicro/mbed/commit/54fbe4144faf309c37205a5d39fa665daa919f10/



NUCLEO_F031K6 : Add new target

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 441:d2c15dda23c1 1 /* mbed Microcontroller Library
mbed_official 441:d2c15dda23c1 2 *******************************************************************************
mbed_official 441:d2c15dda23c1 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 441:d2c15dda23c1 4 * All rights reserved.
mbed_official 441:d2c15dda23c1 5 *
mbed_official 441:d2c15dda23c1 6 * Redistribution and use in source and binary forms, with or without
mbed_official 441:d2c15dda23c1 7 * modification, are permitted provided that the following conditions are met:
mbed_official 441:d2c15dda23c1 8 *
mbed_official 441:d2c15dda23c1 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 441:d2c15dda23c1 10 * this list of conditions and the following disclaimer.
mbed_official 441:d2c15dda23c1 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 441:d2c15dda23c1 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 441:d2c15dda23c1 13 * and/or other materials provided with the distribution.
mbed_official 441:d2c15dda23c1 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 441:d2c15dda23c1 15 * may be used to endorse or promote products derived from this software
mbed_official 441:d2c15dda23c1 16 * without specific prior written permission.
mbed_official 441:d2c15dda23c1 17 *
mbed_official 441:d2c15dda23c1 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 441:d2c15dda23c1 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 441:d2c15dda23c1 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 441:d2c15dda23c1 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 441:d2c15dda23c1 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 441:d2c15dda23c1 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 441:d2c15dda23c1 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 441:d2c15dda23c1 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 441:d2c15dda23c1 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 441:d2c15dda23c1 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 441:d2c15dda23c1 28 *******************************************************************************
mbed_official 441:d2c15dda23c1 29 */
mbed_official 441:d2c15dda23c1 30 #include <stddef.h>
mbed_official 441:d2c15dda23c1 31 #include "cmsis.h"
mbed_official 441:d2c15dda23c1 32 #include "gpio_irq_api.h"
mbed_official 441:d2c15dda23c1 33 #include "pinmap.h"
mbed_official 441:d2c15dda23c1 34 #include "mbed_error.h"
mbed_official 441:d2c15dda23c1 35
mbed_official 441:d2c15dda23c1 36 #define EDGE_NONE (0)
mbed_official 441:d2c15dda23c1 37 #define EDGE_RISE (1)
mbed_official 441:d2c15dda23c1 38 #define EDGE_FALL (2)
mbed_official 441:d2c15dda23c1 39 #define EDGE_BOTH (3)
mbed_official 441:d2c15dda23c1 40
mbed_official 441:d2c15dda23c1 41 // Number of EXTI irq vectors (EXTI0_1, EXTI2_3, EXTI4_15)
mbed_official 441:d2c15dda23c1 42 #define CHANNEL_NUM (3)
mbed_official 441:d2c15dda23c1 43
mbed_official 441:d2c15dda23c1 44 // Max pins for one line (max with EXTI4_15)
mbed_official 441:d2c15dda23c1 45 #define MAX_PIN_LINE (12)
mbed_official 441:d2c15dda23c1 46
mbed_official 441:d2c15dda23c1 47 typedef struct gpio_channel {
mbed_official 441:d2c15dda23c1 48 uint32_t pin_mask; // bitmask representing which pins are configured for receiving interrupts
mbed_official 441:d2c15dda23c1 49 uint32_t channel_ids[MAX_PIN_LINE]; // mbed "gpio_irq_t gpio_irq" field of instance
mbed_official 441:d2c15dda23c1 50 uint32_t channel_gpio[MAX_PIN_LINE]; // base address of gpio port group
mbed_official 441:d2c15dda23c1 51 uint32_t channel_pin[MAX_PIN_LINE]; // pin number in port group
mbed_official 441:d2c15dda23c1 52 } gpio_channel_t;
mbed_official 441:d2c15dda23c1 53
mbed_official 441:d2c15dda23c1 54 static gpio_channel_t channels[CHANNEL_NUM] = {
mbed_official 441:d2c15dda23c1 55 {.pin_mask = 0},
mbed_official 441:d2c15dda23c1 56 {.pin_mask = 0},
mbed_official 441:d2c15dda23c1 57 {.pin_mask = 0}
mbed_official 441:d2c15dda23c1 58 };
mbed_official 441:d2c15dda23c1 59
mbed_official 441:d2c15dda23c1 60 // Used to return the index for channels array.
mbed_official 441:d2c15dda23c1 61 static uint32_t pin_base_nr[16] = {
mbed_official 441:d2c15dda23c1 62 // EXTI0_1
mbed_official 441:d2c15dda23c1 63 0, // pin 0
mbed_official 441:d2c15dda23c1 64 1, // pin 1
mbed_official 441:d2c15dda23c1 65 // EXTI2_3
mbed_official 441:d2c15dda23c1 66 0, // pin 2
mbed_official 441:d2c15dda23c1 67 1, // pin 3
mbed_official 441:d2c15dda23c1 68 // EXTI4_15
mbed_official 441:d2c15dda23c1 69 0, // pin 4
mbed_official 441:d2c15dda23c1 70 1, // pin 5
mbed_official 441:d2c15dda23c1 71 2, // pin 6
mbed_official 441:d2c15dda23c1 72 3, // pin 7
mbed_official 441:d2c15dda23c1 73 4, // pin 8
mbed_official 441:d2c15dda23c1 74 5, // pin 9
mbed_official 441:d2c15dda23c1 75 6, // pin 10
mbed_official 441:d2c15dda23c1 76 7, // pin 11
mbed_official 441:d2c15dda23c1 77 8, // pin 12
mbed_official 441:d2c15dda23c1 78 9, // pin 13
mbed_official 441:d2c15dda23c1 79 10, // pin 14
mbed_official 441:d2c15dda23c1 80 11 // pin 15
mbed_official 441:d2c15dda23c1 81 };
mbed_official 441:d2c15dda23c1 82
mbed_official 441:d2c15dda23c1 83 static gpio_irq_handler irq_handler;
mbed_official 441:d2c15dda23c1 84
mbed_official 630:825f75ca301e 85 static void handle_interrupt_in(uint32_t irq_index, uint32_t max_num_pin_line) {
mbed_official 441:d2c15dda23c1 86 gpio_channel_t *gpio_channel = &channels[irq_index];
mbed_official 441:d2c15dda23c1 87 uint32_t gpio_idx;
mbed_official 441:d2c15dda23c1 88
mbed_official 441:d2c15dda23c1 89 for (gpio_idx = 0; gpio_idx < max_num_pin_line; gpio_idx++) {
mbed_official 441:d2c15dda23c1 90 uint32_t current_mask = (1 << gpio_idx);
mbed_official 441:d2c15dda23c1 91
mbed_official 441:d2c15dda23c1 92 if (gpio_channel->pin_mask & current_mask) {
mbed_official 441:d2c15dda23c1 93 // Retrieve the gpio and pin that generate the irq
mbed_official 441:d2c15dda23c1 94 GPIO_TypeDef *gpio = (GPIO_TypeDef *)(gpio_channel->channel_gpio[gpio_idx]);
mbed_official 441:d2c15dda23c1 95 uint32_t pin = (uint32_t)(1 << (gpio_channel->channel_pin[gpio_idx]));
mbed_official 441:d2c15dda23c1 96
mbed_official 441:d2c15dda23c1 97 // Clear interrupt flag
mbed_official 441:d2c15dda23c1 98 if (__HAL_GPIO_EXTI_GET_FLAG(pin) != RESET) {
mbed_official 441:d2c15dda23c1 99 __HAL_GPIO_EXTI_CLEAR_FLAG(pin);
mbed_official 441:d2c15dda23c1 100
mbed_official 441:d2c15dda23c1 101 if (gpio_channel->channel_ids[gpio_idx] == 0) continue;
mbed_official 441:d2c15dda23c1 102
mbed_official 441:d2c15dda23c1 103 // Check which edge has generated the irq
mbed_official 441:d2c15dda23c1 104 if ((gpio->IDR & pin) == 0) {
mbed_official 441:d2c15dda23c1 105 irq_handler(gpio_channel->channel_ids[gpio_idx], IRQ_FALL);
mbed_official 441:d2c15dda23c1 106 } else {
mbed_official 441:d2c15dda23c1 107 irq_handler(gpio_channel->channel_ids[gpio_idx], IRQ_RISE);
mbed_official 441:d2c15dda23c1 108 }
mbed_official 441:d2c15dda23c1 109 }
mbed_official 441:d2c15dda23c1 110 }
mbed_official 441:d2c15dda23c1 111 }
mbed_official 441:d2c15dda23c1 112 }
mbed_official 441:d2c15dda23c1 113
mbed_official 441:d2c15dda23c1 114 // EXTI lines 0 to 1
mbed_official 630:825f75ca301e 115 static void gpio_irq0(void) {
mbed_official 441:d2c15dda23c1 116 handle_interrupt_in(0, 2);
mbed_official 441:d2c15dda23c1 117 }
mbed_official 441:d2c15dda23c1 118
mbed_official 441:d2c15dda23c1 119 // EXTI lines 2 to 3
mbed_official 630:825f75ca301e 120 static void gpio_irq1(void) {
mbed_official 441:d2c15dda23c1 121 handle_interrupt_in(1, 2);
mbed_official 441:d2c15dda23c1 122 }
mbed_official 441:d2c15dda23c1 123
mbed_official 441:d2c15dda23c1 124 // EXTI lines 4 to 15
mbed_official 630:825f75ca301e 125 static void gpio_irq2(void) {
mbed_official 441:d2c15dda23c1 126 handle_interrupt_in(2, 12);
mbed_official 441:d2c15dda23c1 127 }
mbed_official 441:d2c15dda23c1 128
mbed_official 441:d2c15dda23c1 129 extern uint32_t Set_GPIO_Clock(uint32_t port_idx);
mbed_official 441:d2c15dda23c1 130
mbed_official 630:825f75ca301e 131 int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id) {
mbed_official 441:d2c15dda23c1 132 IRQn_Type irq_n = (IRQn_Type)0;
mbed_official 441:d2c15dda23c1 133 uint32_t vector = 0;
mbed_official 441:d2c15dda23c1 134 uint32_t irq_index;
mbed_official 441:d2c15dda23c1 135 gpio_channel_t *gpio_channel;
mbed_official 441:d2c15dda23c1 136 uint32_t gpio_idx;
mbed_official 441:d2c15dda23c1 137
mbed_official 441:d2c15dda23c1 138 if (pin == NC) return -1;
mbed_official 441:d2c15dda23c1 139
mbed_official 441:d2c15dda23c1 140 uint32_t port_index = STM_PORT(pin);
mbed_official 441:d2c15dda23c1 141 uint32_t pin_index = STM_PIN(pin);
mbed_official 441:d2c15dda23c1 142
mbed_official 441:d2c15dda23c1 143 // Select irq number and interrupt routine
mbed_official 441:d2c15dda23c1 144 if ((pin_index == 0) || (pin_index == 1)) {
mbed_official 441:d2c15dda23c1 145 irq_n = EXTI0_1_IRQn;
mbed_official 441:d2c15dda23c1 146 vector = (uint32_t)&gpio_irq0;
mbed_official 441:d2c15dda23c1 147 irq_index = 0;
mbed_official 441:d2c15dda23c1 148 } else if ((pin_index == 2) || (pin_index == 3)) {
mbed_official 441:d2c15dda23c1 149 irq_n = EXTI2_3_IRQn;
mbed_official 441:d2c15dda23c1 150 vector = (uint32_t)&gpio_irq1;
mbed_official 441:d2c15dda23c1 151 irq_index = 1;
mbed_official 441:d2c15dda23c1 152 } else if ((pin_index > 3) && (pin_index < 16)) {
mbed_official 441:d2c15dda23c1 153 irq_n = EXTI4_15_IRQn;
mbed_official 441:d2c15dda23c1 154 vector = (uint32_t)&gpio_irq2;
mbed_official 441:d2c15dda23c1 155 irq_index = 2;
mbed_official 441:d2c15dda23c1 156 } else {
mbed_official 441:d2c15dda23c1 157 error("InterruptIn error: pin not supported.\n");
mbed_official 441:d2c15dda23c1 158 return -1;
mbed_official 441:d2c15dda23c1 159 }
mbed_official 441:d2c15dda23c1 160
mbed_official 441:d2c15dda23c1 161 // Enable GPIO clock
mbed_official 441:d2c15dda23c1 162 uint32_t gpio_add = Set_GPIO_Clock(port_index);
mbed_official 441:d2c15dda23c1 163
mbed_official 441:d2c15dda23c1 164 // Configure GPIO
mbed_official 441:d2c15dda23c1 165 pin_function(pin, STM_PIN_DATA(STM_MODE_IT_FALLING, GPIO_NOPULL, 0));
mbed_official 441:d2c15dda23c1 166
mbed_official 441:d2c15dda23c1 167 // Enable EXTI interrupt
mbed_official 441:d2c15dda23c1 168 NVIC_SetVector(irq_n, vector);
mbed_official 441:d2c15dda23c1 169 NVIC_EnableIRQ(irq_n);
mbed_official 441:d2c15dda23c1 170
mbed_official 441:d2c15dda23c1 171 // Save informations for future use
mbed_official 441:d2c15dda23c1 172 obj->irq_n = irq_n;
mbed_official 441:d2c15dda23c1 173 obj->irq_index = irq_index;
mbed_official 441:d2c15dda23c1 174 obj->event = EDGE_NONE;
mbed_official 441:d2c15dda23c1 175 obj->pin = pin;
mbed_official 441:d2c15dda23c1 176
mbed_official 441:d2c15dda23c1 177 gpio_channel = &channels[irq_index];
mbed_official 441:d2c15dda23c1 178 gpio_idx = pin_base_nr[pin_index];
mbed_official 441:d2c15dda23c1 179 gpio_channel->pin_mask |= (1 << gpio_idx);
mbed_official 441:d2c15dda23c1 180 gpio_channel->channel_ids[gpio_idx] = id;
mbed_official 441:d2c15dda23c1 181 gpio_channel->channel_gpio[gpio_idx] = gpio_add;
mbed_official 441:d2c15dda23c1 182 gpio_channel->channel_pin[gpio_idx] = pin_index;
mbed_official 441:d2c15dda23c1 183
mbed_official 441:d2c15dda23c1 184 irq_handler = handler;
mbed_official 441:d2c15dda23c1 185
mbed_official 441:d2c15dda23c1 186 return 0;
mbed_official 441:d2c15dda23c1 187 }
mbed_official 441:d2c15dda23c1 188
mbed_official 630:825f75ca301e 189 void gpio_irq_free(gpio_irq_t *obj) {
mbed_official 441:d2c15dda23c1 190 gpio_channel_t *gpio_channel = &channels[obj->irq_index];
mbed_official 441:d2c15dda23c1 191 uint32_t pin_index = STM_PIN(obj->pin);
mbed_official 441:d2c15dda23c1 192 uint32_t gpio_idx = pin_base_nr[pin_index];
mbed_official 441:d2c15dda23c1 193
mbed_official 441:d2c15dda23c1 194 gpio_channel->pin_mask &= ~(1 << gpio_idx);
mbed_official 441:d2c15dda23c1 195 gpio_channel->channel_ids[gpio_idx] = 0;
mbed_official 441:d2c15dda23c1 196 gpio_channel->channel_gpio[gpio_idx] = 0;
mbed_official 441:d2c15dda23c1 197 gpio_channel->channel_pin[gpio_idx] = 0;
mbed_official 441:d2c15dda23c1 198
mbed_official 441:d2c15dda23c1 199 // Disable EXTI line
mbed_official 441:d2c15dda23c1 200 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 441:d2c15dda23c1 201 obj->event = EDGE_NONE;
mbed_official 441:d2c15dda23c1 202 }
mbed_official 441:d2c15dda23c1 203
mbed_official 630:825f75ca301e 204 void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable) {
mbed_official 441:d2c15dda23c1 205 uint32_t mode = STM_MODE_IT_EVT_RESET;
mbed_official 441:d2c15dda23c1 206 uint32_t pull = GPIO_NOPULL;
mbed_official 441:d2c15dda23c1 207
mbed_official 441:d2c15dda23c1 208 if (enable) {
mbed_official 441:d2c15dda23c1 209 if (event == IRQ_RISE) {
mbed_official 441:d2c15dda23c1 210 if ((obj->event == EDGE_FALL) || (obj->event == EDGE_BOTH)) {
mbed_official 441:d2c15dda23c1 211 mode = STM_MODE_IT_RISING_FALLING;
mbed_official 441:d2c15dda23c1 212 obj->event = EDGE_BOTH;
mbed_official 441:d2c15dda23c1 213 } else { // NONE or RISE
mbed_official 441:d2c15dda23c1 214 mode = STM_MODE_IT_RISING;
mbed_official 441:d2c15dda23c1 215 obj->event = EDGE_RISE;
mbed_official 441:d2c15dda23c1 216 }
mbed_official 441:d2c15dda23c1 217 }
mbed_official 441:d2c15dda23c1 218 if (event == IRQ_FALL) {
mbed_official 441:d2c15dda23c1 219 if ((obj->event == EDGE_RISE) || (obj->event == EDGE_BOTH)) {
mbed_official 441:d2c15dda23c1 220 mode = STM_MODE_IT_RISING_FALLING;
mbed_official 441:d2c15dda23c1 221 obj->event = EDGE_BOTH;
mbed_official 441:d2c15dda23c1 222 } else { // NONE or FALL
mbed_official 441:d2c15dda23c1 223 mode = STM_MODE_IT_FALLING;
mbed_official 441:d2c15dda23c1 224 obj->event = EDGE_FALL;
mbed_official 441:d2c15dda23c1 225 }
mbed_official 441:d2c15dda23c1 226 }
mbed_official 441:d2c15dda23c1 227 } else { // Disable
mbed_official 441:d2c15dda23c1 228 if (event == IRQ_RISE) {
mbed_official 441:d2c15dda23c1 229 if ((obj->event == EDGE_FALL) || (obj->event == EDGE_BOTH)) {
mbed_official 441:d2c15dda23c1 230 mode = STM_MODE_IT_FALLING;
mbed_official 441:d2c15dda23c1 231 obj->event = EDGE_FALL;
mbed_official 441:d2c15dda23c1 232 } else { // NONE or RISE
mbed_official 441:d2c15dda23c1 233 mode = STM_MODE_IT_EVT_RESET;
mbed_official 441:d2c15dda23c1 234 obj->event = EDGE_NONE;
mbed_official 441:d2c15dda23c1 235 }
mbed_official 441:d2c15dda23c1 236 }
mbed_official 441:d2c15dda23c1 237 if (event == IRQ_FALL) {
mbed_official 441:d2c15dda23c1 238 if ((obj->event == EDGE_RISE) || (obj->event == EDGE_BOTH)) {
mbed_official 441:d2c15dda23c1 239 mode = STM_MODE_IT_RISING;
mbed_official 441:d2c15dda23c1 240 obj->event = EDGE_RISE;
mbed_official 441:d2c15dda23c1 241 } else { // NONE or FALL
mbed_official 441:d2c15dda23c1 242 mode = STM_MODE_IT_EVT_RESET;
mbed_official 441:d2c15dda23c1 243 obj->event = EDGE_NONE;
mbed_official 441:d2c15dda23c1 244 }
mbed_official 441:d2c15dda23c1 245 }
mbed_official 441:d2c15dda23c1 246 }
mbed_official 441:d2c15dda23c1 247
mbed_official 441:d2c15dda23c1 248 pin_function(obj->pin, STM_PIN_DATA(mode, pull, 0));
mbed_official 441:d2c15dda23c1 249 }
mbed_official 441:d2c15dda23c1 250
mbed_official 630:825f75ca301e 251 void gpio_irq_enable(gpio_irq_t *obj) {
mbed_official 441:d2c15dda23c1 252 NVIC_EnableIRQ(obj->irq_n);
mbed_official 441:d2c15dda23c1 253 }
mbed_official 441:d2c15dda23c1 254
mbed_official 630:825f75ca301e 255 void gpio_irq_disable(gpio_irq_t *obj) {
mbed_official 441:d2c15dda23c1 256 NVIC_DisableIRQ(obj->irq_n);
mbed_official 441:d2c15dda23c1 257 obj->event = EDGE_NONE;
mbed_official 441:d2c15dda23c1 258 }