Diff: targets/hal/TARGET_Freescale/TARGET_KLXX/TARGET_KL26Z/gpio_irq_api.c

Revision:

585:a1ed5b41f74f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Freescale/TARGET_KLXX/TARGET_KL26Z/gpio_irq_api.c	Wed Jul 08 14:45:08 2015 +0100
@@ -0,0 +1,170 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <stddef.h>
+#include "cmsis.h"
+
+#include "gpio_irq_api.h"
+#include "gpio_api.h"
+#include "mbed_error.h"
+
+#define CHANNEL_NUM    64
+
+static uint32_t channel_ids[CHANNEL_NUM] = {0};
+static gpio_irq_handler irq_handler;
+
+#define IRQ_DISABLED        (0)
+#define IRQ_RAISING_EDGE    PORT_PCR_IRQC(9)
+#define IRQ_FALLING_EDGE    PORT_PCR_IRQC(10)
+#define IRQ_EITHER_EDGE     PORT_PCR_IRQC(11)
+
+const uint32_t search_bits[] = {0x0000FFFF, 0x000000FF, 0x0000000F, 0x00000003, 0x00000001};
+
+static void handle_interrupt_in(PORT_Type *port, int ch_base) {
+    uint32_t isfr;
+    uint8_t location;
+
+    while((isfr = port->ISFR) != 0) {
+        location = 0;
+        for (int i = 0; i < 5; i++) {
+            if (!(isfr & (search_bits[i] << location)))
+                location += 1 << (4 - i);
+        }
+        
+        uint32_t id = channel_ids[ch_base + location];
+        if (id == 0) {
+            continue;
+        }
+
+        FGPIO_Type *gpio;
+        gpio_irq_event event = IRQ_NONE;
+        switch (port->PCR[location] & PORT_PCR_IRQC_MASK) {
+            case IRQ_RAISING_EDGE:
+                event = IRQ_RISE;
+                break;
+
+            case IRQ_FALLING_EDGE:
+                event = IRQ_FALL;
+                break;
+
+            case IRQ_EITHER_EDGE:
+                gpio = (port == PORTA) ? (FPTA) : (FPTD);
+                event = (gpio->PDIR & (1 << location)) ? (IRQ_RISE) : (IRQ_FALL);
+                break;
+        }
+        if (event != IRQ_NONE) {
+            irq_handler(id, event);
+        }
+        port->ISFR = 1 << location;
+    }
+}
+
+void gpio_irqA(void) {handle_interrupt_in(PORTA, 0);}
+void gpio_irqD(void) {handle_interrupt_in(PORTD, 32);}
+
+int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id) {
+    if (pin == NC) return -1;
+
+    irq_handler = handler;
+
+    obj->port = pin >> PORT_SHIFT;
+    obj->pin = (pin & 0x7F) >> 2;
+
+    uint32_t ch_base, vector;
+    IRQn_Type irq_n;
+    switch (obj->port) {
+            case PortA:
+                ch_base = 0;  irq_n = PORTA_IRQn; vector = (uint32_t)gpio_irqA;
+                break;
+
+            case PortD:
+                ch_base = 32; irq_n = PORTD_IRQn; vector = (uint32_t)gpio_irqD;
+                break;
+
+            default:
+                error("gpio_irq only supported on port A and D");
+                break;
+    }
+    NVIC_SetVector(irq_n, vector);
+    NVIC_EnableIRQ(irq_n);
+
+    obj->ch = ch_base + obj->pin;
+    channel_ids[obj->ch] = id;
+
+    return 0;
+}
+
+void gpio_irq_free(gpio_irq_t *obj) {
+    channel_ids[obj->ch] = 0;
+}
+
+void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable) {
+    PORT_Type *port = (PORT_Type *)(PORTA_BASE + 0x1000 * obj->port);
+
+    uint32_t irq_settings = IRQ_DISABLED;
+
+    switch (port->PCR[obj->pin] & PORT_PCR_IRQC_MASK) {
+        case IRQ_DISABLED:
+            if (enable) {
+                irq_settings = (event == IRQ_RISE) ? (IRQ_RAISING_EDGE) : (IRQ_FALLING_EDGE);
+            }
+            break;
+
+        case IRQ_RAISING_EDGE:
+            if (enable) {
+                irq_settings = (event == IRQ_RISE) ? (IRQ_RAISING_EDGE) : (IRQ_EITHER_EDGE);
+            } else {
+                if (event == IRQ_FALL)
+                    irq_settings = IRQ_RAISING_EDGE;
+            }
+            break;
+
+        case IRQ_FALLING_EDGE:
+            if (enable) {
+                irq_settings = (event == IRQ_FALL) ? (IRQ_FALLING_EDGE) : (IRQ_EITHER_EDGE);
+            } else {
+                if (event == IRQ_RISE)
+                    irq_settings = IRQ_FALLING_EDGE;
+            }
+            break;
+
+        case IRQ_EITHER_EDGE:
+            if (enable) {
+                irq_settings = IRQ_EITHER_EDGE;
+            } else {
+                irq_settings = (event == IRQ_RISE) ? (IRQ_FALLING_EDGE) : (IRQ_RAISING_EDGE);
+            }
+            break;
+    }
+
+    // Interrupt configuration and clear interrupt
+    port->PCR[obj->pin] = (port->PCR[obj->pin] & ~PORT_PCR_IRQC_MASK) | irq_settings | PORT_PCR_ISF_MASK;
+}
+
+void gpio_irq_enable(gpio_irq_t *obj) {
+    if (obj->port == PortA) {
+        NVIC_EnableIRQ(PORTA_IRQn);
+    } else if (obj->port == PortD) {
+        NVIC_EnableIRQ(PORTD_IRQn);
+    }
+}
+
+void gpio_irq_disable(gpio_irq_t *obj) {
+    if (obj->port == PortA) {
+        NVIC_DisableIRQ(PORTA_IRQn);
+    } else if (obj->port == PortD) {
+        NVIC_DisableIRQ(PORTD_IRQn);
+    }
+}