Diff: targets/hal/TARGET_Freescale/TARGET_KL05Z/gpio_irq_api.c

Revision:

20:4263a77256ae

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Freescale/TARGET_KL05Z/gpio_irq_api.c	Tue Sep 10 15:14:19 2013 +0300
@@ -0,0 +1,156 @@
+/* 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 "error.h"
+
+#define CHANNEL_NUM    64   // 31 pins on 2 ports
+
+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)
+
+static void handle_interrupt_in(PORT_Type *port, int ch_base) {
+    uint32_t mask = 0, i;
+
+    for (i = 0; i < 32; i++) {
+        uint32_t pmask = (1 << i);
+        if (port->ISFR & pmask) {
+            mask |= pmask;
+            uint32_t id = channel_ids[ch_base + i];
+            if (id == 0) continue;
+
+            FGPIO_Type *gpio;
+            gpio_irq_event event = IRQ_NONE;
+            switch (port->PCR[i] & 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) : (FPTB);
+                    event = (gpio->PDIR & pmask) ? (IRQ_RISE) : (IRQ_FALL);
+                    break;
+            }
+            if (event != IRQ_NONE) {
+                irq_handler(id, event);
+            }
+        }
+    }
+    port->ISFR = mask;
+}
+
+/* IRQ only on PORTA and PORTB */
+void gpio_irqA(void) {
+    handle_interrupt_in(PORTA, 0);
+}
+
+void gpio_irqB(void) {
+    handle_interrupt_in(PORTB, 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 PortB:
+          ch_base = 32;
+          irq_n = PORTB_IRQn;
+          vector = (uint32_t)gpio_irqB;
+          break;
+
+      default:
+          error("gpio_irq only supported on Port A and B\n");
+          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;
+}