Diff: targets/hal/TARGET_NXP/TARGET_LPC43XX/gpio_irq_api.c

Revision:

20:4263a77256ae

Child:

35:371630885ad6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_NXP/TARGET_LPC43XX/gpio_irq_api.c	Tue Sep 10 15:14:19 2013 +0300
@@ -0,0 +1,136 @@
+/* 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.
+ *
+ * Ported to NXP LPC43XX by Micromint USA <support@micromint.com>
+ */
+#include <stddef.h>
+#include "gpio_irq_api.h"
+#include "error.h"
+#include "cmsis.h"
+
+/* The LPC43xx implements GPIO pin and group interrupts. Any pin in the
+ * 8 32-bit GPIO ports can interrupt. On group interrupts a pin can
+ * only interrupt on the rising or falling edge, not both as required
+ * by mbed. Also, group interrupts can't be cleared individually.
+ * This implementation uses pin interrupts (8 on M4/M3, 1 on M0).
+ * A future implementation may provide group interrupt support.
+ */
+#if !defined(CORE_M0)
+#define CHANNEL_NUM    8
+#else
+#define CHANNEL_NUM    1
+#endif
+
+static uint32_t channel_ids[CHANNEL_NUM] = {0};
+static uint32_t channel = 0;
+static gpio_irq_handler irq_handler;
+
+static void handle_interrupt_in(void) {
+    uint32_t rise = LPC_GPIO_PIN_INT->RISE;
+    uint32_t fall = LPC_GPIO_PIN_INT->FALL;
+    uint32_t pmask;
+    int i;
+
+    for (i = 0; i < CHANNEL_NUM; i++) {
+        pmask = (1 << i);
+        if (rise & pmask) {
+            /* Rising edge interrupts */
+            if (channel_ids[i] != 0)
+                irq_handler(channel_ids[i], IRQ_RISE);
+            /* Clear rising edge detected */
+            LPC_GPIO_PIN_INT->RISE = pmask;
+        }
+        if (fall & pmask) {
+            /* Falling edge interrupts */
+            if (channel_ids[i] != 0)
+                irq_handler(channel_ids[i], IRQ_FALL);
+            /* Clear falling edge detected */
+            LPC_GPIO_PIN_INT->FALL = pmask;
+        }
+    }
+}
+
+int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id) {
+    uint32_t portnum, pinnum; //, pmask;
+
+    if (pin == NC) return -1;
+
+    irq_handler = handler;
+
+    /* Set port and pin numbers */
+    obj->port = portnum = MBED_GPIO_PORT(pin);
+    obj->pin = pinnum = MBED_GPIO_PIN(pin);
+
+    /* Add to channel table */
+    channel_ids[channel] = id;
+    obj->ch = channel;
+
+	  /* Clear rising and falling edge detection */
+    //pmask = (1 << channel);
+    //LPC_GPIO_PIN_INT->IST = pmask;
+
+    /* Set SCU */
+    if (channel < 4) {
+        LPC_SCU->PINTSEL0 &= ~(0xFF << (portnum << 3));
+        LPC_SCU->PINTSEL0 |= (((portnum << 5) | pinnum) << (channel << 3));
+    } else {
+        LPC_SCU->PINTSEL1 &= ~(0xFF << ((portnum - 4) << 3));
+        LPC_SCU->PINTSEL1 |= (((portnum << 5) | pinnum) << ((channel - 4) << 3));
+    }
+	
+#if !defined(CORE_M0)
+    NVIC_SetVector((IRQn_Type)(PIN_INT0_IRQn + channel), (uint32_t)handle_interrupt_in);
+    NVIC_EnableIRQ((IRQn_Type)(PIN_INT0_IRQn + channel));
+#else
+    NVIC_SetVector((IRQn_Type)PIN_INT4_IRQn, (uint32_t)handle_interrupt_in);
+    NVIC_EnableIRQ((IRQn_Type)PIN_INT4_IRQn);
+#endif
+
+    // Increment channel number
+    channel++;
+    channel %= CHANNEL_NUM;
+
+    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) {
+    uint32_t pmask;
+
+    /* Clear pending interrupts */
+    pmask = (1 << obj->ch);
+    LPC_GPIO_PIN_INT->IST = pmask;
+
+    /* Configure pin interrupt */
+    LPC_GPIO_PIN_INT->ISEL &= ~pmask;
+    if (event == IRQ_RISE) {
+        /* Rising edge interrupts */
+        if (enable) {
+            LPC_GPIO_PIN_INT->SIENR |= pmask;
+        } else {
+            LPC_GPIO_PIN_INT->CIENR |= pmask;
+        }
+    } else {
+        /* Falling edge interrupts */
+        if (enable) {
+            LPC_GPIO_PIN_INT->SIENF |= pmask;
+        } else {
+            LPC_GPIO_PIN_INT->CIENF |= pmask;
+        }
+    }
+}