Diff: targets/TARGET_STM/gpio_irq_api.c

Revision:

0:13413ea9a877

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/gpio_irq_api.c	Sun Jun 12 14:02:44 2022 +0000
@@ -0,0 +1,315 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2014, 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"
+#include "gpio_irq_device.h"
+
+#define EDGE_NONE (0)
+#define EDGE_RISE (1)
+#define EDGE_FALL (2)
+#define EDGE_BOTH (3)
+
+
+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
+    GPIO_TypeDef* 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_irq_handler irq_handler;
+
+static gpio_channel_t channels[CHANNEL_NUM] = {
+#ifdef EXTI_IRQ0_NUM_LINES
+    {.pin_mask = 0},
+#endif
+#ifdef EXTI_IRQ1_NUM_LINES
+    {.pin_mask = 0},
+#endif
+#ifdef EXTI_IRQ2_NUM_LINES
+    {.pin_mask = 0},
+#endif
+#ifdef EXTI_IRQ3_NUM_LINES
+    {.pin_mask = 0},
+#endif
+#ifdef EXTI_IRQ4_NUM_LINES
+    {.pin_mask = 0},
+#endif
+#ifdef EXTI_IRQ5_NUM_LINES
+    {.pin_mask = 0},
+#endif
+#ifdef EXTI_IRQ6_NUM_LINES
+    {.pin_mask = 0}
+#endif
+};
+
+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);
+                }
+                return;
+            }
+        }
+    }
+    error("Unexpected Spurious interrupt, index %d\r\n", irq_index);
+}
+
+
+#ifdef EXTI_IRQ0_NUM_LINES
+// EXTI line 0
+static void gpio_irq0(void)
+{
+    handle_interrupt_in(0, EXTI_IRQ0_NUM_LINES);
+}
+#endif
+#ifdef EXTI_IRQ1_NUM_LINES
+// EXTI line 1
+static void gpio_irq1(void)
+{
+    handle_interrupt_in(1, EXTI_IRQ1_NUM_LINES);
+}
+#endif
+#ifdef EXTI_IRQ2_NUM_LINES
+// EXTI line 2
+static void gpio_irq2(void)
+{
+    handle_interrupt_in(2, EXTI_IRQ2_NUM_LINES);
+}
+#endif
+#ifdef EXTI_IRQ3_NUM_LINES
+// EXTI line 3
+static void gpio_irq3(void)
+{
+    handle_interrupt_in(3, EXTI_IRQ3_NUM_LINES);
+}
+#endif
+#ifdef EXTI_IRQ4_NUM_LINES
+// EXTI line 4
+static void gpio_irq4(void)
+{
+    handle_interrupt_in(4, EXTI_IRQ4_NUM_LINES);
+}
+#endif
+#ifdef EXTI_IRQ5_NUM_LINES
+// EXTI lines 5 to 9
+static void gpio_irq5(void)
+{
+    handle_interrupt_in(5, EXTI_IRQ5_NUM_LINES);
+}
+#endif
+#ifdef EXTI_IRQ6_NUM_LINES
+// EXTI lines 10 to 15
+static void gpio_irq6(void)
+{
+    handle_interrupt_in(6, EXTI_IRQ6_NUM_LINES);
+}
+#endif
+
+extern GPIO_TypeDef *Set_GPIO_Clock(uint32_t port_idx);
+extern void pin_function_gpiomode(PinName pin, uint32_t gpiomode);
+
+int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id)
+{
+    uint32_t vector = 0;
+    uint32_t irq_index;
+    gpio_channel_t *gpio_channel;
+    uint32_t gpio_idx;
+
+    if (pin == NC) return -1;
+
+    /* Enable SYSCFG Clock */
+    __HAL_RCC_SYSCFG_CLK_ENABLE();
+
+    uint32_t port_index  = STM_PORT(pin);
+    uint32_t pin_index  = STM_PIN(pin);
+    irq_index =  pin_lines_desc[pin_index].irq_index;
+
+    switch (irq_index) {
+#ifdef EXTI_IRQ0_NUM_LINES
+        case 0:
+            vector = (uint32_t)&gpio_irq0;
+            break;
+#endif
+#ifdef EXTI_IRQ1_NUM_LINES
+        case 1:
+            vector = (uint32_t)&gpio_irq1;
+            break;
+#endif
+#ifdef EXTI_IRQ2_NUM_LINES
+        case 2:
+            vector = (uint32_t)&gpio_irq2;
+            break;
+#endif
+#ifdef EXTI_IRQ3_NUM_LINES
+        case 3:
+            vector = (uint32_t)&gpio_irq3;
+            break;
+#endif
+#ifdef EXTI_IRQ4_NUM_LINES
+        case 4:
+            vector = (uint32_t)&gpio_irq4;
+            break;
+#endif
+#ifdef EXTI_IRQ5_NUM_LINES
+        case 5:
+            vector = (uint32_t)&gpio_irq5;
+            break;
+#endif
+#ifdef EXTI_IRQ6_NUM_LINES
+        case 6:
+            vector = (uint32_t)&gpio_irq6;
+            break;
+#endif
+        default:
+            error("InterruptIn error: pin not supported.\n");
+            return -1;
+    }
+
+    // Enable GPIO clock
+    GPIO_TypeDef *gpio_add = Set_GPIO_Clock(port_index);
+
+    // Save informations for future use
+    obj->irq_n = pin_lines_desc[pin_index].irq_n;
+    obj->irq_index =  pin_lines_desc[pin_index].irq_index;
+    obj->event = EDGE_NONE;
+    obj->pin = pin;
+
+    gpio_channel = &channels[irq_index];
+    gpio_idx = pin_lines_desc[pin_index].gpio_idx;
+    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;
+
+    // Enable EXTI interrupt
+    NVIC_SetVector(obj->irq_n, vector);
+    gpio_irq_enable(obj);
+
+    return 0;
+}
+
+void gpio_irq_free(gpio_irq_t *obj)
+{
+    uint32_t gpio_idx = pin_lines_desc[STM_PIN(obj->pin)].gpio_idx;
+    gpio_channel_t *gpio_channel = &channels[obj->irq_index];
+
+    gpio_irq_disable(obj);
+    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;
+}
+
+void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable)
+{
+    /*  Enable / Disable Edge triggered interrupt and store event */
+    if (event == IRQ_RISE) {
+        if (enable) {
+            LL_EXTI_EnableRisingTrig_0_31(1 << STM_PIN(obj->pin));
+            obj->event |= IRQ_RISE;
+        } else {
+            LL_EXTI_DisableRisingTrig_0_31(1 << STM_PIN(obj->pin));
+            obj->event &= ~IRQ_RISE;
+        }
+    }
+    if (event == IRQ_FALL) {
+        if (enable) {
+            LL_EXTI_EnableFallingTrig_0_31(1 << STM_PIN(obj->pin));
+            obj->event |= IRQ_FALL;
+        } else {
+            LL_EXTI_DisableFallingTrig_0_31(1 << STM_PIN(obj->pin));
+            obj->event &= ~IRQ_FALL;
+        }
+    }
+}
+
+void gpio_irq_enable(gpio_irq_t *obj)
+{
+    uint32_t temp = 0;
+    uint32_t port_index = STM_PORT(obj->pin);
+    uint32_t pin_index  = STM_PIN(obj->pin);
+
+    /*  Select Source  */
+    temp = SYSCFG->EXTICR[pin_index >> 2];
+    CLEAR_BIT(temp, (0x0FU) << (4U * (pin_index & 0x03U)));
+    SET_BIT(temp, port_index << (4U * (pin_index & 0x03U)));
+    SYSCFG->EXTICR[pin_index >> 2] = temp;
+
+    LL_EXTI_EnableIT_0_31(1 << pin_index);
+
+    /* Restore previous edge interrupt configuration if applicable */
+    if (obj->event & IRQ_RISE) {
+        LL_EXTI_EnableRisingTrig_0_31(1 << STM_PIN(obj->pin));
+    }
+    if (obj->event & IRQ_FALL) {
+        LL_EXTI_EnableFallingTrig_0_31(1 << STM_PIN(obj->pin));
+    }
+
+    NVIC_EnableIRQ(obj->irq_n);
+}
+
+void gpio_irq_disable(gpio_irq_t *obj)
+{
+    /* Clear EXTI line configuration */
+    LL_EXTI_DisableRisingTrig_0_31(1 << STM_PIN(obj->pin));
+    LL_EXTI_DisableFallingTrig_0_31(1 << STM_PIN(obj->pin));
+    LL_EXTI_DisableIT_0_31(1 << STM_PIN(obj->pin));
+    NVIC_DisableIRQ(obj->irq_n);
+    NVIC_ClearPendingIRQ(obj->irq_n);
+}
+