Joris Aerts
mbed library sources
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Diff: targets/hal/TARGET_STM/TARGET_STM32L4/gpio_irq_api.c
- Revision:
- 610:813dcc80987e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_STM/TARGET_STM32L4/gpio_irq_api.c Fri Aug 14 13:15:17 2015 +0100
@@ -0,0 +1,332 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2015, STMicroelectronics
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *******************************************************************************
+ */
+#include <stddef.h>
+#include "cmsis.h"
+#include "gpio_irq_api.h"
+#include "pinmap.h"
+#include "mbed_error.h"
+
+#define EDGE_NONE (0)
+#define EDGE_RISE (1)
+#define EDGE_FALL (2)
+#define EDGE_BOTH (3)
+
+// Number of EXTI irq vectors (EXTI0, EXTI1, EXTI2, EXTI3, EXTI4, EXTI5_9, EXTI10_15)
+#define CHANNEL_NUM (7)
+
+// Max pins for one line (max with EXTI10_15)
+#define MAX_PIN_LINE (6)
+
+typedef struct gpio_channel {
+ uint32_t pin_mask; // bitmask representing which pins are configured for receiving interrupts
+ uint32_t channel_ids[MAX_PIN_LINE]; // mbed "gpio_irq_t gpio_irq" field of instance
+ uint32_t channel_gpio[MAX_PIN_LINE]; // base address of gpio port group
+ uint32_t channel_pin[MAX_PIN_LINE]; // pin number in port group
+} gpio_channel_t;
+
+static gpio_channel_t channels[CHANNEL_NUM] = {
+ {.pin_mask = 0},
+ {.pin_mask = 0},
+ {.pin_mask = 0},
+ {.pin_mask = 0},
+ {.pin_mask = 0},
+ {.pin_mask = 0},
+ {.pin_mask = 0}
+};
+
+// Used to return the index for channels array.
+static uint32_t pin_base_nr[16] = {
+ // EXTI0
+ 0, // pin 0
+ // EXTI1
+ 0, // pin 1
+ // EXTI2
+ 0, // pin 2
+ // EXTI3
+ 0, // pin 3
+ // EXTI4
+ 0, // pin 4
+ // EXTI5_9
+ 0, // pin 5
+ 1, // pin 6
+ 2, // pin 7
+ 3, // pin 8
+ 4, // pin 9
+ // EXTI10_15
+ 0, // pin 10
+ 1, // pin 11
+ 2, // pin 12
+ 3, // pin 13
+ 4, // pin 14
+ 5 // pin 15
+};
+
+static gpio_irq_handler irq_handler;
+
+static void handle_interrupt_in(uint32_t irq_index, uint32_t max_num_pin_line)
+{
+ gpio_channel_t *gpio_channel = &channels[irq_index];
+ uint32_t gpio_idx;
+
+ for (gpio_idx = 0; gpio_idx < max_num_pin_line; gpio_idx++) {
+ uint32_t current_mask = (1 << gpio_idx);
+
+ if (gpio_channel->pin_mask & current_mask) {
+ // Retrieve the gpio and pin that generate the irq
+ GPIO_TypeDef *gpio = (GPIO_TypeDef *)(gpio_channel->channel_gpio[gpio_idx]);
+ uint32_t pin = (uint32_t)(1 << (gpio_channel->channel_pin[gpio_idx]));
+
+ // Clear interrupt flag
+ if (__HAL_GPIO_EXTI_GET_FLAG(pin) != RESET) {
+ __HAL_GPIO_EXTI_CLEAR_FLAG(pin);
+
+ if (gpio_channel->channel_ids[gpio_idx] == 0) continue;
+
+ // Check which edge has generated the irq
+ if ((gpio->IDR & pin) == 0) {
+ irq_handler(gpio_channel->channel_ids[gpio_idx], IRQ_FALL);
+ } else {
+ irq_handler(gpio_channel->channel_ids[gpio_idx], IRQ_RISE);
+ }
+ }
+ }
+ }
+}
+
+// EXTI line 0
+static void gpio_irq0(void)
+{
+ handle_interrupt_in(0, 1);
+}
+
+// EXTI line 1
+static void gpio_irq1(void)
+{
+ handle_interrupt_in(1, 1);
+}
+
+// EXTI line 2
+static void gpio_irq2(void)
+{
+ handle_interrupt_in(2, 1);
+}
+
+// EXTI line 3
+static void gpio_irq3(void)
+{
+ handle_interrupt_in(3, 1);
+}
+
+// EXTI line 4
+static void gpio_irq4(void)
+{
+ handle_interrupt_in(4, 1);
+}
+
+// EXTI lines 5 to 9
+static void gpio_irq5(void)
+{
+ handle_interrupt_in(5, 5);
+}
+
+// EXTI lines 10 to 15
+static void gpio_irq6(void)
+{
+ handle_interrupt_in(6, 6);
+}
+
+extern uint32_t Set_GPIO_Clock(uint32_t port_idx);
+
+int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id)
+{
+ IRQn_Type irq_n = (IRQn_Type)0;
+ uint32_t vector = 0;
+ uint32_t irq_index;
+ gpio_channel_t *gpio_channel;
+ uint32_t gpio_idx;
+
+ if (pin == NC) return -1;
+
+ uint32_t port_index = STM_PORT(pin);
+ uint32_t pin_index = STM_PIN(pin);
+
+ // Select irq number and interrupt routine
+ switch (pin_index) {
+ case 0:
+ irq_n = EXTI0_IRQn;
+ vector = (uint32_t)&gpio_irq0;
+ irq_index = 0;
+ break;
+ case 1:
+ irq_n = EXTI1_IRQn;
+ vector = (uint32_t)&gpio_irq1;
+ irq_index = 1;
+ break;
+ case 2:
+ irq_n = EXTI2_IRQn;
+ vector = (uint32_t)&gpio_irq2;
+ irq_index = 2;
+ break;
+ case 3:
+ irq_n = EXTI3_IRQn;
+ vector = (uint32_t)&gpio_irq3;
+ irq_index = 3;
+ break;
+ case 4:
+ irq_n = EXTI4_IRQn;
+ vector = (uint32_t)&gpio_irq4;
+ irq_index = 4;
+ break;
+ case 5:
+ case 6:
+ case 7:
+ case 8:
+ case 9:
+ irq_n = EXTI9_5_IRQn;
+ vector = (uint32_t)&gpio_irq5;
+ irq_index = 5;
+ break;
+ case 10:
+ case 11:
+ case 12:
+ case 13:
+ case 14:
+ case 15:
+ irq_n = EXTI15_10_IRQn;
+ vector = (uint32_t)&gpio_irq6;
+ irq_index = 6;
+ break;
+ default:
+ error("InterruptIn error: pin not supported\n");
+ return -1;
+ }
+
+ // Enable GPIO clock
+ uint32_t gpio_add = Set_GPIO_Clock(port_index);
+
+ // Configure GPIO
+ pin_function(pin, STM_PIN_DATA(STM_MODE_IT_FALLING, GPIO_NOPULL, 0));
+
+ // Enable EXTI interrupt
+ NVIC_SetVector(irq_n, vector);
+ NVIC_EnableIRQ(irq_n);
+
+ // Save informations for future use
+ obj->irq_n = irq_n;
+ obj->irq_index = irq_index;
+ obj->event = EDGE_NONE;
+ obj->pin = pin;
+
+ gpio_channel = &channels[irq_index];
+ gpio_idx = pin_base_nr[pin_index];
+ gpio_channel->pin_mask |= (1 << gpio_idx);
+ gpio_channel->channel_ids[gpio_idx] = id;
+ gpio_channel->channel_gpio[gpio_idx] = gpio_add;
+ gpio_channel->channel_pin[gpio_idx] = pin_index;
+
+ irq_handler = handler;
+
+ return 0;
+}
+
+void gpio_irq_free(gpio_irq_t *obj)
+{
+ gpio_channel_t *gpio_channel = &channels[obj->irq_index];
+ uint32_t pin_index = STM_PIN(obj->pin);
+ uint32_t gpio_idx = pin_base_nr[pin_index];
+
+ gpio_channel->pin_mask &= ~(1 << gpio_idx);
+ gpio_channel->channel_ids[gpio_idx] = 0;
+ gpio_channel->channel_gpio[gpio_idx] = 0;
+ gpio_channel->channel_pin[gpio_idx] = 0;
+
+ // Disable EXTI line
+ pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
+ obj->event = EDGE_NONE;
+}
+
+void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable)
+{
+ uint32_t mode = STM_MODE_IT_EVT_RESET;
+ uint32_t pull = GPIO_NOPULL;
+
+ if (enable) {
+ if (event == IRQ_RISE) {
+ if ((obj->event == EDGE_FALL) || (obj->event == EDGE_BOTH)) {
+ mode = STM_MODE_IT_RISING_FALLING;
+ obj->event = EDGE_BOTH;
+ } else { // NONE or RISE
+ mode = STM_MODE_IT_RISING;
+ obj->event = EDGE_RISE;
+ }
+ }
+ if (event == IRQ_FALL) {
+ if ((obj->event == EDGE_RISE) || (obj->event == EDGE_BOTH)) {
+ mode = STM_MODE_IT_RISING_FALLING;
+ obj->event = EDGE_BOTH;
+ } else { // NONE or FALL
+ mode = STM_MODE_IT_FALLING;
+ obj->event = EDGE_FALL;
+ }
+ }
+ } else { // Disable
+ if (event == IRQ_RISE) {
+ if ((obj->event == EDGE_FALL) || (obj->event == EDGE_BOTH)) {
+ mode = STM_MODE_IT_FALLING;
+ obj->event = EDGE_FALL;
+ } else { // NONE or RISE
+ mode = STM_MODE_IT_EVT_RESET;
+ obj->event = EDGE_NONE;
+ }
+ }
+ if (event == IRQ_FALL) {
+ if ((obj->event == EDGE_RISE) || (obj->event == EDGE_BOTH)) {
+ mode = STM_MODE_IT_RISING;
+ obj->event = EDGE_RISE;
+ } else { // NONE or FALL
+ mode = STM_MODE_IT_EVT_RESET;
+ obj->event = EDGE_NONE;
+ }
+ }
+ }
+
+ pin_function(obj->pin, STM_PIN_DATA(mode, pull, 0));
+}
+
+void gpio_irq_enable(gpio_irq_t *obj)
+{
+ NVIC_EnableIRQ(obj->irq_n);
+}
+
+void gpio_irq_disable(gpio_irq_t *obj)
+{
+ NVIC_DisableIRQ(obj->irq_n);
+ obj->event = EDGE_NONE;
+}