Diff: targets/TARGET_Maxim/TARGET_MAX32620C/gpio_irq_api.c

Revision:

186:707f6e361f3e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Maxim/TARGET_MAX32620C/gpio_irq_api.c	Fri Jun 22 16:45:37 2018 +0100
@@ -0,0 +1,179 @@
+/*******************************************************************************
+ * Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
+ * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name of Maxim Integrated
+ * Products, Inc. shall not be used except as stated in the Maxim Integrated
+ * Products, Inc. Branding Policy.
+ *
+ * The mere transfer of this software does not imply any licenses
+ * of trade secrets, proprietary technology, copyrights, patents,
+ * trademarks, maskwork rights, or any other form of intellectual
+ * property whatsoever. Maxim Integrated Products, Inc. retains all
+ * ownership rights.
+ *******************************************************************************
+ */
+
+#include <stddef.h>
+#include "cmsis.h"
+#include "gpio_irq_api.h"
+#include "mbed_error.h"
+
+static gpio_irq_t *objs[MXC_GPIO_NUM_PORTS][MXC_GPIO_MAX_PINS_PER_PORT] = {{0}};
+static gpio_irq_handler irq_handler;
+
+static void handle_irq(unsigned int port)
+{
+    uint32_t intfl, in_val;
+    uint32_t mask;
+    unsigned int pin;
+
+    /* Read pin state */
+    in_val = MXC_GPIO->in_val[port];
+
+    /* Read interrupts */
+    intfl = MXC_GPIO->intfl[port] & MXC_GPIO->inten[port];
+
+    mask = 1;
+
+    for (pin = 0; pin < MXC_GPIO_MAX_PINS_PER_PORT; pin++) {
+        if (intfl & mask) {
+            MXC_GPIO->intfl[port] = mask;    /* clear interrupt */
+            gpio_irq_event event = (in_val & mask) ? IRQ_RISE : IRQ_FALL;
+            gpio_irq_t *obj = objs[port][pin];
+            if (obj && obj->id) {
+                if ((event == IRQ_RISE) && obj->rise_en) {
+                    irq_handler(obj->id, IRQ_RISE);
+                } else if ((event == IRQ_FALL) && obj->fall_en) {
+                    irq_handler(obj->id, IRQ_FALL);
+                }
+            }
+        }
+        mask <<= 1;
+    }
+}
+
+void gpio_irq_0(void) { handle_irq(0); }
+void gpio_irq_1(void) { handle_irq(1); }
+void gpio_irq_2(void) { handle_irq(2); }
+void gpio_irq_3(void) { handle_irq(3); }
+void gpio_irq_4(void) { handle_irq(4); }
+void gpio_irq_5(void) { handle_irq(5); }
+void gpio_irq_6(void) { handle_irq(6); }
+
+int gpio_irq_init(gpio_irq_t *obj, PinName name, gpio_irq_handler handler, uint32_t id)
+{
+    if (name == NC) {
+        return -1;
+    }
+
+    uint8_t port = PINNAME_TO_PORT(name);
+    uint8_t pin = PINNAME_TO_PIN(name);
+
+    if ((port > MXC_GPIO_NUM_PORTS) || (pin > MXC_GPIO_MAX_PINS_PER_PORT)) {
+        return 1;
+    }
+
+    obj->port = port;
+    obj->pin = pin;
+    obj->id = id;
+    objs[port][pin] = obj;
+
+    /* register handlers */
+    irq_handler = handler;
+    NVIC_SetVector(GPIO_P0_IRQn, (uint32_t)gpio_irq_0);
+    NVIC_SetVector(GPIO_P1_IRQn, (uint32_t)gpio_irq_1);
+    NVIC_SetVector(GPIO_P2_IRQn, (uint32_t)gpio_irq_2);
+    NVIC_SetVector(GPIO_P3_IRQn, (uint32_t)gpio_irq_3);
+    NVIC_SetVector(GPIO_P4_IRQn, (uint32_t)gpio_irq_4);
+    NVIC_SetVector(GPIO_P5_IRQn, (uint32_t)gpio_irq_5);
+    NVIC_SetVector(GPIO_P6_IRQn, (uint32_t)gpio_irq_6);
+
+    /* disable the interrupt locally */
+    MXC_GPIO->int_mode[port] &= ~(0xF << (pin*4));
+
+    /* clear a pending request */
+    MXC_GPIO->intfl[port] = 1 << pin;
+
+    /* enable the requested interrupt */
+    MXC_GPIO->inten[port] |= (1 << pin);
+    NVIC_EnableIRQ((IRQn_Type)((uint32_t)GPIO_P0_IRQn + port));
+
+    return 0;
+}
+
+void gpio_irq_free(gpio_irq_t *obj)
+{
+    /* disable interrupt */
+    MXC_GPIO->inten[obj->port] &= ~(1 << obj->pin);
+    MXC_GPIO->int_mode[obj->port] &= ~(MXC_V_GPIO_INT_MODE_ANY_EDGE << (obj->pin*4));
+    objs[obj->port][obj->pin] = NULL;
+}
+
+void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable)
+{
+    if (event == IRQ_FALL) {
+        obj->fall_en = enable;
+    } else if (event == IRQ_RISE) {
+        obj->rise_en = enable;
+    }
+
+    if (obj->fall_en && obj->rise_en) {
+        MXC_GPIO->int_mode[obj->port] |= (MXC_V_GPIO_INT_MODE_ANY_EDGE << (obj->pin*4));
+    } else if (obj->fall_en) {
+        uint32_t int_mode = MXC_GPIO->int_mode[obj->port];
+        int_mode &= ~(MXC_V_GPIO_INT_MODE_ANY_EDGE << (obj->pin*4));
+        int_mode |=  (MXC_V_GPIO_INT_MODE_FALLING_EDGE << (obj->pin*4));
+        MXC_GPIO->int_mode[obj->port] = int_mode;
+    } else if (obj->rise_en) {
+        uint32_t int_mode = MXC_GPIO->int_mode[obj->port];
+        int_mode &= ~(MXC_V_GPIO_INT_MODE_ANY_EDGE << (obj->pin*4));
+        int_mode |=  (MXC_V_GPIO_INT_MODE_RISING_EDGE << (obj->pin*4));
+        MXC_GPIO->int_mode[obj->port] = int_mode;
+    } else {
+        MXC_GPIO->int_mode[obj->port] &= ~(MXC_V_GPIO_INT_MODE_ANY_EDGE << (obj->pin*4));
+    }
+}
+
+void gpio_irq_enable(gpio_irq_t *obj)
+{
+    MXC_GPIO->inten[obj->port] |= (1 << obj->pin);
+}
+
+void gpio_irq_disable(gpio_irq_t *obj)
+{
+    MXC_GPIO->inten[obj->port] &= ~(1 << obj->pin);
+}
+
+gpio_irq_t *gpio_irq_get_obj(PinName name)
+{
+    if (name == NC) {
+        return NULL;
+    }
+
+    unsigned int port = PINNAME_TO_PORT(name);
+    unsigned int pin = PINNAME_TO_PIN(name);
+
+    if ((port > MXC_GPIO_NUM_PORTS) || (pin > MXC_GPIO_MAX_PINS_PER_PORT)) {
+        return NULL;
+    }
+
+    return objs[port][pin];
+}