tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32L0/gpio_irq_api.c

   1 /* mbed Microcontroller Library
   2  *******************************************************************************
   3  * Copyright (c) 2014, STMicroelectronics
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright notice,
  12  *    this list of conditions and the following disclaimer in the documentation
  13  *    and/or other materials provided with the distribution.
  14  * 3. Neither the name of STMicroelectronics nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  25  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  26  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *******************************************************************************
  29  */
  30 #include <stddef.h>
  31 #include "cmsis.h"
  32 #include "gpio_irq_api.h"
  33 #include "pinmap.h"
  34 #include "mbed_error.h"
  35
  36 #define EDGE_NONE (0)
  37 #define EDGE_RISE (1)
  38 #define EDGE_FALL (2)
  39 #define EDGE_BOTH (3)
  40
  41 // Number of EXTI irq vectors (EXTI0_1, EXTI2_3, EXTI4_15)
  42 #define CHANNEL_NUM (3)
  43
  44 // Max pins for one line (max with EXTI4_15)
  45 #define MAX_PIN_LINE (12)
  46
  47 typedef struct gpio_channel {
  48     uint32_t pin_mask;                   // bitmask representing which pins are configured for receiving interrupts
  49     uint32_t channel_ids[MAX_PIN_LINE];  // mbed "gpio_irq_t gpio_irq" field of instance
  50     uint32_t channel_gpio[MAX_PIN_LINE]; // base address of gpio port group
  51     uint32_t channel_pin[MAX_PIN_LINE];  // pin number in port group
  52 } gpio_channel_t;
  53
  54 static gpio_channel_t channels[CHANNEL_NUM] = {
  55     {.pin_mask = 0},
  56     {.pin_mask = 0},
  57     {.pin_mask = 0}
  58 };
  59
  60 // Used to return the index for channels array.
  61 static uint32_t pin_base_nr[16] = {
  62     // EXTI0_1
  63     0, // pin 0
  64     1, // pin 1
  65     // EXTI2_3
  66     0, // pin 2
  67     1, // pin 3
  68     // EXTI4_15
  69     0, // pin 4
  70     1, // pin 5
  71     2, // pin 6
  72     3, // pin 7
  73     4, // pin 8
  74     5, // pin 9
  75     6, // pin 10
  76     7, // pin 11
  77     8, // pin 12
  78     9, // pin 13
  79    10, // pin 14
  80    11  // pin 15
  81 };
  82
  83 static gpio_irq_handler irq_handler;
  84
  85 static void handle_interrupt_in(uint32_t irq_index, uint32_t max_num_pin_line)
  86 {
  87     gpio_channel_t *gpio_channel = &channels[irq_index];
  88     uint32_t gpio_idx;
  89
  90     for (gpio_idx = 0; gpio_idx < max_num_pin_line; gpio_idx++) {
  91         uint32_t current_mask = (1 << gpio_idx);
  92
  93         if (gpio_channel->pin_mask & current_mask) {
  94             // Retrieve the gpio and pin that generate the irq
  95             GPIO_TypeDef *gpio = (GPIO_TypeDef *)(gpio_channel->channel_gpio[gpio_idx]);
  96             uint32_t pin = (uint32_t)(1 << (gpio_channel->channel_pin[gpio_idx]));
  97
  98             // Clear interrupt flag
  99             if (__HAL_GPIO_EXTI_GET_FLAG(pin) != RESET) {
 100                 __HAL_GPIO_EXTI_CLEAR_FLAG(pin);
 101
 102                 if (gpio_channel->channel_ids[gpio_idx] == 0) continue;
 103
 104                 // Check which edge has generated the irq
 105                 if ((gpio->IDR & pin) == 0) {
 106                     irq_handler(gpio_channel->channel_ids[gpio_idx], IRQ_FALL);
 107                 } else  {
 108                     irq_handler(gpio_channel->channel_ids[gpio_idx], IRQ_RISE);
 109                 }
 110             }
 111         }
 112     }
 113 }
 114
 115 // EXTI lines 0 to 1
 116 static void gpio_irq0(void)
 117 {
 118     handle_interrupt_in(0, 2);
 119 }
 120
 121 // EXTI lines 2 to 3
 122 static void gpio_irq1(void)
 123 {
 124     handle_interrupt_in(1, 2);
 125 }
 126
 127 // EXTI lines 4 to 15
 128 static void gpio_irq2(void)
 129 {
 130     handle_interrupt_in(2, 12);
 131 }
 132
 133 extern uint32_t Set_GPIO_Clock(uint32_t port_idx);
 134
 135 int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id)
 136 {
 137     IRQn_Type irq_n = (IRQn_Type)0;
 138     uint32_t vector = 0;
 139     uint32_t irq_index;
 140     gpio_channel_t *gpio_channel;
 141     uint32_t gpio_idx;
 142
 143     if (pin == NC) return -1;
 144
 145     uint32_t port_index = STM_PORT(pin);
 146     uint32_t pin_index  = STM_PIN(pin);
 147
 148     // Select irq number and interrupt routine
 149     if ((pin_index == 0) || (pin_index == 1)) {
 150         irq_n = EXTI0_1_IRQn;
 151         vector = (uint32_t)&gpio_irq0;
 152         irq_index = 0;
 153     } else if ((pin_index == 2) || (pin_index == 3)) {
 154         irq_n = EXTI2_3_IRQn;
 155         vector = (uint32_t)&gpio_irq1;
 156         irq_index = 1;
 157     } else if ((pin_index > 3) && (pin_index < 16)) {
 158         irq_n = EXTI4_15_IRQn;
 159         vector = (uint32_t)&gpio_irq2;
 160         irq_index = 2;
 161     } else {
 162         error("InterruptIn error: pin not supported.\n");
 163         return -1;
 164     }
 165
 166     // Enable GPIO clock
 167     uint32_t gpio_add = Set_GPIO_Clock(port_index);
 168
 169     // Configure GPIO
 170     pin_function(pin, STM_PIN_DATA(STM_MODE_IT_FALLING, GPIO_NOPULL, 0));
 171
 172     // Enable EXTI interrupt
 173     NVIC_SetVector(irq_n, vector);
 174     NVIC_EnableIRQ(irq_n);
 175
 176     // Save informations for future use
 177     obj->irq_n = irq_n;
 178     obj->irq_index = irq_index;
 179     obj->event = EDGE_NONE;
 180     obj->pin = pin;
 181
 182     gpio_channel = &channels[irq_index];
 183     gpio_idx = pin_base_nr[pin_index];
 184     gpio_channel->pin_mask |= (1 << gpio_idx);
 185     gpio_channel->channel_ids[gpio_idx] = id;
 186     gpio_channel->channel_gpio[gpio_idx] = gpio_add;
 187     gpio_channel->channel_pin[gpio_idx] = pin_index;
 188
 189     irq_handler = handler;
 190
 191     return 0;
 192 }
 193
 194 void gpio_irq_free(gpio_irq_t *obj)
 195 {
 196     gpio_channel_t *gpio_channel = &channels[obj->irq_index];
 197     uint32_t pin_index  = STM_PIN(obj->pin);
 198     uint32_t gpio_idx = pin_base_nr[pin_index];
 199
 200     gpio_channel->pin_mask &= ~(1 << gpio_idx);
 201     gpio_channel->channel_ids[gpio_idx] = 0;
 202     gpio_channel->channel_gpio[gpio_idx] = 0;
 203     gpio_channel->channel_pin[gpio_idx] = 0;
 204
 205     // Disable EXTI line
 206     pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
 207     obj->event = EDGE_NONE;
 208 }
 209
 210 void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable)
 211 {
 212     uint32_t mode = STM_MODE_IT_EVT_RESET;
 213     uint32_t pull = GPIO_NOPULL;
 214
 215     if (enable) {
 216         if (event == IRQ_RISE) {
 217             if ((obj->event == EDGE_FALL) || (obj->event == EDGE_BOTH)) {
 218                 mode = STM_MODE_IT_RISING_FALLING;
 219                 obj->event = EDGE_BOTH;
 220             } else { // NONE or RISE
 221                 mode = STM_MODE_IT_RISING;
 222                 obj->event = EDGE_RISE;
 223             }
 224         }
 225         if (event == IRQ_FALL) {
 226             if ((obj->event == EDGE_RISE) || (obj->event == EDGE_BOTH)) {
 227                 mode = STM_MODE_IT_RISING_FALLING;
 228                 obj->event = EDGE_BOTH;
 229             } else { // NONE or FALL
 230                 mode = STM_MODE_IT_FALLING;
 231                 obj->event = EDGE_FALL;
 232             }
 233         }
 234     } else { // Disable
 235         if (event == IRQ_RISE) {
 236             if ((obj->event == EDGE_FALL) || (obj->event == EDGE_BOTH)) {
 237                 mode = STM_MODE_IT_FALLING;
 238                 obj->event = EDGE_FALL;
 239             } else { // NONE or RISE
 240                 mode = STM_MODE_IT_EVT_RESET;
 241                 obj->event = EDGE_NONE;
 242             }
 243         }
 244         if (event == IRQ_FALL) {
 245             if ((obj->event == EDGE_RISE) || (obj->event == EDGE_BOTH)) {
 246                 mode = STM_MODE_IT_RISING;
 247                 obj->event = EDGE_RISE;
 248             } else { // NONE or FALL
 249                 mode = STM_MODE_IT_EVT_RESET;
 250                 obj->event = EDGE_NONE;
 251             }
 252         }
 253     }
 254
 255     pin_function(obj->pin, STM_PIN_DATA(mode, pull, 0));
 256 }
 257
 258 void gpio_irq_enable(gpio_irq_t *obj)
 259 {
 260     NVIC_EnableIRQ(obj->irq_n);
 261 }
 262
 263 void gpio_irq_disable(gpio_irq_t *obj)
 264 {
 265     NVIC_DisableIRQ(obj->irq_n);
 266     obj->event = EDGE_NONE;
 267 }