li lei / mbed-stm32l0l1-src

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Fork of mbed-stm32l0l1-src-1 by lzbp li

api_source/gpio_irq_api.c@639:b32fded6b0ae, 2016-09-27 (annotated)

Committer:
floatlei
Date:
Tue Sep 27 09:40:53 2016 +0000
Revision:
639:b32fded6b0ae
Parent:
targets/hal/TARGET_STM/TARGET_STM32L0/gpio_irq_api.c@531:47d2b67c511f 
sf

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 181:a4cbdfbbd2f4 1 /* mbed Microcontroller Library
mbed_official 181:a4cbdfbbd2f4 2 *******************************************************************************
mbed_official 531:47d2b67c511f 3 * Copyright (c) 2015, STMicroelectronics
mbed_official 181:a4cbdfbbd2f4 4 * All rights reserved.
mbed_official 181:a4cbdfbbd2f4 5 *
mbed_official 181:a4cbdfbbd2f4 6 * Redistribution and use in source and binary forms, with or without
mbed_official 181:a4cbdfbbd2f4 7 * modification, are permitted provided that the following conditions are met:
mbed_official 181:a4cbdfbbd2f4 8 *
mbed_official 181:a4cbdfbbd2f4 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 10 * this list of conditions and the following disclaimer.
mbed_official 181:a4cbdfbbd2f4 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 181:a4cbdfbbd2f4 13 * and/or other materials provided with the distribution.
mbed_official 181:a4cbdfbbd2f4 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 181:a4cbdfbbd2f4 15 * may be used to endorse or promote products derived from this software
mbed_official 181:a4cbdfbbd2f4 16 * without specific prior written permission.
mbed_official 181:a4cbdfbbd2f4 17 *
mbed_official 181:a4cbdfbbd2f4 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 181:a4cbdfbbd2f4 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 181:a4cbdfbbd2f4 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 181:a4cbdfbbd2f4 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 181:a4cbdfbbd2f4 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 181:a4cbdfbbd2f4 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 181:a4cbdfbbd2f4 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 181:a4cbdfbbd2f4 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 181:a4cbdfbbd2f4 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 181:a4cbdfbbd2f4 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 181:a4cbdfbbd2f4 28 *******************************************************************************
mbed_official 181:a4cbdfbbd2f4 29 */
mbed_official 181:a4cbdfbbd2f4 30 #include <stddef.h>
mbed_official 181:a4cbdfbbd2f4 31 #include "cmsis.h"
mbed_official 181:a4cbdfbbd2f4 32 #include "gpio_irq_api.h"
mbed_official 181:a4cbdfbbd2f4 33 #include "pinmap.h"
mbed_official 285:31249416b6f9 34 #include "mbed_error.h"
mbed_official 181:a4cbdfbbd2f4 35
mbed_official 181:a4cbdfbbd2f4 36 #define EDGE_NONE (0)
mbed_official 181:a4cbdfbbd2f4 37 #define EDGE_RISE (1)
mbed_official 181:a4cbdfbbd2f4 38 #define EDGE_FALL (2)
mbed_official 181:a4cbdfbbd2f4 39 #define EDGE_BOTH (3)
mbed_official 181:a4cbdfbbd2f4 40
mbed_official 413:ee28a0bed4ad 41 // Number of EXTI irq vectors (EXTI0_1, EXTI2_3, EXTI4_15)
mbed_official 181:a4cbdfbbd2f4 42 #define CHANNEL_NUM (3)
mbed_official 181:a4cbdfbbd2f4 43
mbed_official 413:ee28a0bed4ad 44 // Max pins for one line (max with EXTI4_15)
mbed_official 413:ee28a0bed4ad 45 #define MAX_PIN_LINE (12)
mbed_official 413:ee28a0bed4ad 46
mbed_official 413:ee28a0bed4ad 47 typedef struct gpio_channel {
mbed_official 413:ee28a0bed4ad 48 uint32_t pin_mask; // bitmask representing which pins are configured for receiving interrupts
mbed_official 413:ee28a0bed4ad 49 uint32_t channel_ids[MAX_PIN_LINE]; // mbed "gpio_irq_t gpio_irq" field of instance
mbed_official 413:ee28a0bed4ad 50 uint32_t channel_gpio[MAX_PIN_LINE]; // base address of gpio port group
mbed_official 413:ee28a0bed4ad 51 uint32_t channel_pin[MAX_PIN_LINE]; // pin number in port group
mbed_official 413:ee28a0bed4ad 52 } gpio_channel_t;
mbed_official 413:ee28a0bed4ad 53
mbed_official 413:ee28a0bed4ad 54 static gpio_channel_t channels[CHANNEL_NUM] = {
mbed_official 413:ee28a0bed4ad 55 {.pin_mask = 0},
mbed_official 413:ee28a0bed4ad 56 {.pin_mask = 0},
mbed_official 413:ee28a0bed4ad 57 {.pin_mask = 0}
mbed_official 413:ee28a0bed4ad 58 };
mbed_official 413:ee28a0bed4ad 59
mbed_official 413:ee28a0bed4ad 60 // Used to return the index for channels array.
mbed_official 413:ee28a0bed4ad 61 static uint32_t pin_base_nr[16] = {
mbed_official 413:ee28a0bed4ad 62 // EXTI0_1
mbed_official 413:ee28a0bed4ad 63 0, // pin 0
mbed_official 413:ee28a0bed4ad 64 1, // pin 1
mbed_official 413:ee28a0bed4ad 65 // EXTI2_3
mbed_official 413:ee28a0bed4ad 66 0, // pin 2
mbed_official 413:ee28a0bed4ad 67 1, // pin 3
mbed_official 413:ee28a0bed4ad 68 // EXTI4_15
mbed_official 413:ee28a0bed4ad 69 0, // pin 4
mbed_official 413:ee28a0bed4ad 70 1, // pin 5
mbed_official 413:ee28a0bed4ad 71 2, // pin 6
mbed_official 413:ee28a0bed4ad 72 3, // pin 7
mbed_official 413:ee28a0bed4ad 73 4, // pin 8
mbed_official 413:ee28a0bed4ad 74 5, // pin 9
mbed_official 413:ee28a0bed4ad 75 6, // pin 10
mbed_official 413:ee28a0bed4ad 76 7, // pin 11
mbed_official 413:ee28a0bed4ad 77 8, // pin 12
mbed_official 413:ee28a0bed4ad 78 9, // pin 13
mbed_official 531:47d2b67c511f 79 10, // pin 14
mbed_official 531:47d2b67c511f 80 11 // pin 15
mbed_official 413:ee28a0bed4ad 81 };
mbed_official 181:a4cbdfbbd2f4 82
mbed_official 181:a4cbdfbbd2f4 83 static gpio_irq_handler irq_handler;
mbed_official 181:a4cbdfbbd2f4 84
mbed_official 413:ee28a0bed4ad 85 static void handle_interrupt_in(uint32_t irq_index, uint32_t max_num_pin_line)
mbed_official 402:09075a3b15e3 86 {
mbed_official 413:ee28a0bed4ad 87 gpio_channel_t *gpio_channel = &channels[irq_index];
mbed_official 413:ee28a0bed4ad 88 uint32_t gpio_idx;
mbed_official 413:ee28a0bed4ad 89
mbed_official 413:ee28a0bed4ad 90 for (gpio_idx = 0; gpio_idx < max_num_pin_line; gpio_idx++) {
mbed_official 413:ee28a0bed4ad 91 uint32_t current_mask = (1 << gpio_idx);
mbed_official 413:ee28a0bed4ad 92
mbed_official 413:ee28a0bed4ad 93 if (gpio_channel->pin_mask & current_mask) {
mbed_official 413:ee28a0bed4ad 94 // Retrieve the gpio and pin that generate the irq
mbed_official 413:ee28a0bed4ad 95 GPIO_TypeDef *gpio = (GPIO_TypeDef *)(gpio_channel->channel_gpio[gpio_idx]);
mbed_official 413:ee28a0bed4ad 96 uint32_t pin = (uint32_t)(1 << (gpio_channel->channel_pin[gpio_idx]));
mbed_official 181:a4cbdfbbd2f4 97
mbed_official 413:ee28a0bed4ad 98 // Clear interrupt flag
mbed_official 413:ee28a0bed4ad 99 if (__HAL_GPIO_EXTI_GET_FLAG(pin) != RESET) {
mbed_official 413:ee28a0bed4ad 100 __HAL_GPIO_EXTI_CLEAR_FLAG(pin);
mbed_official 413:ee28a0bed4ad 101
mbed_official 413:ee28a0bed4ad 102 if (gpio_channel->channel_ids[gpio_idx] == 0) continue;
mbed_official 181:a4cbdfbbd2f4 103
mbed_official 413:ee28a0bed4ad 104 // Check which edge has generated the irq
mbed_official 413:ee28a0bed4ad 105 if ((gpio->IDR & pin) == 0) {
mbed_official 413:ee28a0bed4ad 106 irq_handler(gpio_channel->channel_ids[gpio_idx], IRQ_FALL);
mbed_official 413:ee28a0bed4ad 107 } else {
mbed_official 413:ee28a0bed4ad 108 irq_handler(gpio_channel->channel_ids[gpio_idx], IRQ_RISE);
mbed_official 413:ee28a0bed4ad 109 }
mbed_official 413:ee28a0bed4ad 110 }
mbed_official 413:ee28a0bed4ad 111 }
mbed_official 181:a4cbdfbbd2f4 112 }
mbed_official 181:a4cbdfbbd2f4 113 }
mbed_official 181:a4cbdfbbd2f4 114
mbed_official 181:a4cbdfbbd2f4 115 // EXTI lines 0 to 1
mbed_official 402:09075a3b15e3 116 static void gpio_irq0(void)
mbed_official 402:09075a3b15e3 117 {
mbed_official 413:ee28a0bed4ad 118 handle_interrupt_in(0, 2);
mbed_official 181:a4cbdfbbd2f4 119 }
mbed_official 413:ee28a0bed4ad 120
mbed_official 181:a4cbdfbbd2f4 121 // EXTI lines 2 to 3
mbed_official 402:09075a3b15e3 122 static void gpio_irq1(void)
mbed_official 402:09075a3b15e3 123 {
mbed_official 413:ee28a0bed4ad 124 handle_interrupt_in(1, 2);
mbed_official 181:a4cbdfbbd2f4 125 }
mbed_official 413:ee28a0bed4ad 126
mbed_official 181:a4cbdfbbd2f4 127 // EXTI lines 4 to 15
mbed_official 402:09075a3b15e3 128 static void gpio_irq2(void)
mbed_official 402:09075a3b15e3 129 {
mbed_official 413:ee28a0bed4ad 130 handle_interrupt_in(2, 12);
mbed_official 181:a4cbdfbbd2f4 131 }
mbed_official 181:a4cbdfbbd2f4 132
mbed_official 181:a4cbdfbbd2f4 133 extern uint32_t Set_GPIO_Clock(uint32_t port_idx);
mbed_official 181:a4cbdfbbd2f4 134
mbed_official 402:09075a3b15e3 135 int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id)
mbed_official 402:09075a3b15e3 136 {
mbed_official 181:a4cbdfbbd2f4 137 IRQn_Type irq_n = (IRQn_Type)0;
mbed_official 181:a4cbdfbbd2f4 138 uint32_t vector = 0;
mbed_official 181:a4cbdfbbd2f4 139 uint32_t irq_index;
mbed_official 413:ee28a0bed4ad 140 gpio_channel_t *gpio_channel;
mbed_official 413:ee28a0bed4ad 141 uint32_t gpio_idx;
mbed_official 181:a4cbdfbbd2f4 142
mbed_official 181:a4cbdfbbd2f4 143 if (pin == NC) return -1;
mbed_official 181:a4cbdfbbd2f4 144
mbed_official 181:a4cbdfbbd2f4 145 uint32_t port_index = STM_PORT(pin);
mbed_official 181:a4cbdfbbd2f4 146 uint32_t pin_index = STM_PIN(pin);
mbed_official 181:a4cbdfbbd2f4 147
mbed_official 181:a4cbdfbbd2f4 148 // Select irq number and interrupt routine
mbed_official 181:a4cbdfbbd2f4 149 if ((pin_index == 0) || (pin_index == 1)) {
mbed_official 181:a4cbdfbbd2f4 150 irq_n = EXTI0_1_IRQn;
mbed_official 181:a4cbdfbbd2f4 151 vector = (uint32_t)&gpio_irq0;
mbed_official 181:a4cbdfbbd2f4 152 irq_index = 0;
mbed_official 181:a4cbdfbbd2f4 153 } else if ((pin_index == 2) || (pin_index == 3)) {
mbed_official 181:a4cbdfbbd2f4 154 irq_n = EXTI2_3_IRQn;
mbed_official 181:a4cbdfbbd2f4 155 vector = (uint32_t)&gpio_irq1;
mbed_official 181:a4cbdfbbd2f4 156 irq_index = 1;
mbed_official 181:a4cbdfbbd2f4 157 } else if ((pin_index > 3) && (pin_index < 16)) {
mbed_official 181:a4cbdfbbd2f4 158 irq_n = EXTI4_15_IRQn;
mbed_official 181:a4cbdfbbd2f4 159 vector = (uint32_t)&gpio_irq2;
mbed_official 181:a4cbdfbbd2f4 160 irq_index = 2;
mbed_official 181:a4cbdfbbd2f4 161 } else {
mbed_official 181:a4cbdfbbd2f4 162 error("InterruptIn error: pin not supported.\n");
mbed_official 181:a4cbdfbbd2f4 163 return -1;
mbed_official 181:a4cbdfbbd2f4 164 }
mbed_official 181:a4cbdfbbd2f4 165
mbed_official 181:a4cbdfbbd2f4 166 // Enable GPIO clock
mbed_official 181:a4cbdfbbd2f4 167 uint32_t gpio_add = Set_GPIO_Clock(port_index);
mbed_official 181:a4cbdfbbd2f4 168
mbed_official 181:a4cbdfbbd2f4 169 // Configure GPIO
mbed_official 181:a4cbdfbbd2f4 170 pin_function(pin, STM_PIN_DATA(STM_MODE_IT_FALLING, GPIO_NOPULL, 0));
mbed_official 181:a4cbdfbbd2f4 171
mbed_official 181:a4cbdfbbd2f4 172 // Enable EXTI interrupt
mbed_official 181:a4cbdfbbd2f4 173 NVIC_SetVector(irq_n, vector);
mbed_official 181:a4cbdfbbd2f4 174 NVIC_EnableIRQ(irq_n);
mbed_official 181:a4cbdfbbd2f4 175
mbed_official 181:a4cbdfbbd2f4 176 // Save informations for future use
mbed_official 181:a4cbdfbbd2f4 177 obj->irq_n = irq_n;
mbed_official 181:a4cbdfbbd2f4 178 obj->irq_index = irq_index;
mbed_official 181:a4cbdfbbd2f4 179 obj->event = EDGE_NONE;
mbed_official 181:a4cbdfbbd2f4 180 obj->pin = pin;
mbed_official 413:ee28a0bed4ad 181
mbed_official 413:ee28a0bed4ad 182 gpio_channel = &channels[irq_index];
mbed_official 413:ee28a0bed4ad 183 gpio_idx = pin_base_nr[pin_index];
mbed_official 413:ee28a0bed4ad 184 gpio_channel->pin_mask |= (1 << gpio_idx);
mbed_official 413:ee28a0bed4ad 185 gpio_channel->channel_ids[gpio_idx] = id;
mbed_official 413:ee28a0bed4ad 186 gpio_channel->channel_gpio[gpio_idx] = gpio_add;
mbed_official 413:ee28a0bed4ad 187 gpio_channel->channel_pin[gpio_idx] = pin_index;
mbed_official 181:a4cbdfbbd2f4 188
mbed_official 181:a4cbdfbbd2f4 189 irq_handler = handler;
mbed_official 181:a4cbdfbbd2f4 190
mbed_official 181:a4cbdfbbd2f4 191 return 0;
mbed_official 181:a4cbdfbbd2f4 192 }
mbed_official 181:a4cbdfbbd2f4 193
mbed_official 402:09075a3b15e3 194 void gpio_irq_free(gpio_irq_t *obj)
mbed_official 402:09075a3b15e3 195 {
mbed_official 413:ee28a0bed4ad 196 gpio_channel_t *gpio_channel = &channels[obj->irq_index];
mbed_official 413:ee28a0bed4ad 197 uint32_t pin_index = STM_PIN(obj->pin);
mbed_official 413:ee28a0bed4ad 198 uint32_t gpio_idx = pin_base_nr[pin_index];
mbed_official 413:ee28a0bed4ad 199
mbed_official 413:ee28a0bed4ad 200 gpio_channel->pin_mask &= ~(1 << gpio_idx);
mbed_official 413:ee28a0bed4ad 201 gpio_channel->channel_ids[gpio_idx] = 0;
mbed_official 413:ee28a0bed4ad 202 gpio_channel->channel_gpio[gpio_idx] = 0;
mbed_official 413:ee28a0bed4ad 203 gpio_channel->channel_pin[gpio_idx] = 0;
mbed_official 413:ee28a0bed4ad 204
mbed_official 181:a4cbdfbbd2f4 205 // Disable EXTI line
mbed_official 181:a4cbdfbbd2f4 206 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 181:a4cbdfbbd2f4 207 obj->event = EDGE_NONE;
mbed_official 181:a4cbdfbbd2f4 208 }
mbed_official 181:a4cbdfbbd2f4 209
mbed_official 331:098575c6d2c8 210 void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable)
mbed_official 331:098575c6d2c8 211 {
mbed_official 331:098575c6d2c8 212 uint32_t mode = STM_MODE_IT_EVT_RESET;
mbed_official 181:a4cbdfbbd2f4 213 uint32_t pull = GPIO_NOPULL;
mbed_official 181:a4cbdfbbd2f4 214
mbed_official 181:a4cbdfbbd2f4 215 if (enable) {
mbed_official 181:a4cbdfbbd2f4 216 if (event == IRQ_RISE) {
mbed_official 181:a4cbdfbbd2f4 217 if ((obj->event == EDGE_FALL) || (obj->event == EDGE_BOTH)) {
mbed_official 181:a4cbdfbbd2f4 218 mode = STM_MODE_IT_RISING_FALLING;
mbed_official 181:a4cbdfbbd2f4 219 obj->event = EDGE_BOTH;
mbed_official 181:a4cbdfbbd2f4 220 } else { // NONE or RISE
mbed_official 181:a4cbdfbbd2f4 221 mode = STM_MODE_IT_RISING;
mbed_official 181:a4cbdfbbd2f4 222 obj->event = EDGE_RISE;
mbed_official 181:a4cbdfbbd2f4 223 }
mbed_official 181:a4cbdfbbd2f4 224 }
mbed_official 181:a4cbdfbbd2f4 225 if (event == IRQ_FALL) {
mbed_official 181:a4cbdfbbd2f4 226 if ((obj->event == EDGE_RISE) || (obj->event == EDGE_BOTH)) {
mbed_official 181:a4cbdfbbd2f4 227 mode = STM_MODE_IT_RISING_FALLING;
mbed_official 181:a4cbdfbbd2f4 228 obj->event = EDGE_BOTH;
mbed_official 181:a4cbdfbbd2f4 229 } else { // NONE or FALL
mbed_official 181:a4cbdfbbd2f4 230 mode = STM_MODE_IT_FALLING;
mbed_official 181:a4cbdfbbd2f4 231 obj->event = EDGE_FALL;
mbed_official 181:a4cbdfbbd2f4 232 }
mbed_official 181:a4cbdfbbd2f4 233 }
mbed_official 331:098575c6d2c8 234 } else { // Disable
mbed_official 331:098575c6d2c8 235 if (event == IRQ_RISE) {
mbed_official 331:098575c6d2c8 236 if ((obj->event == EDGE_FALL) || (obj->event == EDGE_BOTH)) {
mbed_official 331:098575c6d2c8 237 mode = STM_MODE_IT_FALLING;
mbed_official 331:098575c6d2c8 238 obj->event = EDGE_FALL;
mbed_official 331:098575c6d2c8 239 } else { // NONE or RISE
mbed_official 331:098575c6d2c8 240 mode = STM_MODE_IT_EVT_RESET;
mbed_official 331:098575c6d2c8 241 obj->event = EDGE_NONE;
mbed_official 331:098575c6d2c8 242 }
mbed_official 331:098575c6d2c8 243 }
mbed_official 331:098575c6d2c8 244 if (event == IRQ_FALL) {
mbed_official 331:098575c6d2c8 245 if ((obj->event == EDGE_RISE) || (obj->event == EDGE_BOTH)) {
mbed_official 331:098575c6d2c8 246 mode = STM_MODE_IT_RISING;
mbed_official 331:098575c6d2c8 247 obj->event = EDGE_RISE;
mbed_official 331:098575c6d2c8 248 } else { // NONE or FALL
mbed_official 331:098575c6d2c8 249 mode = STM_MODE_IT_EVT_RESET;
mbed_official 331:098575c6d2c8 250 obj->event = EDGE_NONE;
mbed_official 331:098575c6d2c8 251 }
mbed_official 331:098575c6d2c8 252 }
mbed_official 181:a4cbdfbbd2f4 253 }
mbed_official 181:a4cbdfbbd2f4 254
mbed_official 181:a4cbdfbbd2f4 255 pin_function(obj->pin, STM_PIN_DATA(mode, pull, 0));
mbed_official 181:a4cbdfbbd2f4 256 }
mbed_official 181:a4cbdfbbd2f4 257
mbed_official 402:09075a3b15e3 258 void gpio_irq_enable(gpio_irq_t *obj)
mbed_official 402:09075a3b15e3 259 {
mbed_official 181:a4cbdfbbd2f4 260 NVIC_EnableIRQ(obj->irq_n);
mbed_official 181:a4cbdfbbd2f4 261 }
mbed_official 181:a4cbdfbbd2f4 262
mbed_official 402:09075a3b15e3 263 void gpio_irq_disable(gpio_irq_t *obj)
mbed_official 402:09075a3b15e3 264 {
mbed_official 181:a4cbdfbbd2f4 265 NVIC_DisableIRQ(obj->irq_n);
mbed_official 181:a4cbdfbbd2f4 266 obj->event = EDGE_NONE;
mbed_official 181:a4cbdfbbd2f4 267 }