Diff: targets/hal/TARGET_NXP/TARGET_LPC176X/gpio_irq_api.c

Revision:

43:b3acfef78949

Parent:

42:7ca0bbba899b

--- a/targets/hal/TARGET_NXP/TARGET_LPC176X/gpio_irq_api.c	Sun Oct 27 16:30:04 2013 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,161 +0,0 @@
-/* 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 "gpio_irq_api.h"
-#include "error.h"
-#include "cmsis.h"
-
-#define CHANNEL_NUM     48
-
-static uint32_t channel_ids[CHANNEL_NUM] = {0};
-static gpio_irq_handler irq_handler;
-
-static void handle_interrupt_in(void) {
-    // Read in all current interrupt registers. We do this once as the
-    // GPIO interrupt registers are on the APB bus, and this is slow.
-    uint32_t rise0 = LPC_GPIOINT->IO0IntStatR;
-    uint32_t fall0 = LPC_GPIOINT->IO0IntStatF;
-    uint32_t rise2 = LPC_GPIOINT->IO2IntStatR;
-    uint32_t fall2 = LPC_GPIOINT->IO2IntStatF;
-    uint8_t bitloc;
-    
-    while(rise0 > 0) {      //Continue as long as there are interrupts pending
-        bitloc = 31 - __CLZ(rise0); //CLZ returns number of leading zeros, 31 minus that is location of first pending interrupt
-        if (channel_ids[bitloc] != 0)
-            irq_handler(channel_ids[bitloc], IRQ_RISE); //Run that interrupt
-        
-        //Both clear the interrupt with clear register, and remove it from our local copy of the interrupt pending register
-        LPC_GPIOINT->IO0IntClr = 1 << bitloc;
-        rise0 -= 1<<bitloc;
-    }
-    
-    while(fall0 > 0) {      //Continue as long as there are interrupts pending
-        bitloc = 31 - __CLZ(fall0); //CLZ returns number of leading zeros, 31 minus that is location of first pending interrupt
-        if (channel_ids[bitloc] != 0)
-            irq_handler(channel_ids[bitloc], IRQ_FALL); //Run that interrupt
-        
-        //Both clear the interrupt with clear register, and remove it from our local copy of the interrupt pending register
-        LPC_GPIOINT->IO0IntClr = 1 << bitloc;
-        fall0 -= 1<<bitloc;
-    }
-    
-    //Same for port 2, only we need to watch the channel_index
-    while(rise2 > 0) {      //Continue as long as there are interrupts pending
-        bitloc = 31 - __CLZ(rise2); //CLZ returns number of leading zeros, 31 minus that is location of first pending interrupt
-        
-        if (bitloc < 16)            //Not sure if this is actually needed
-            if (channel_ids[bitloc+32] != 0)
-                irq_handler(channel_ids[bitloc+32], IRQ_RISE); //Run that interrupt
-        
-        //Both clear the interrupt with clear register, and remove it from our local copy of the interrupt pending register
-        LPC_GPIOINT->IO2IntClr = 1 << bitloc;
-        rise2 -= 1<<bitloc;
-    }
-    
-    while(fall2 > 0) {      //Continue as long as there are interrupts pending
-        bitloc = 31 - __CLZ(fall2); //CLZ returns number of leading zeros, 31 minus that is location of first pending interrupt
-        
-        if (bitloc < 16)            //Not sure if this is actually needed
-            if (channel_ids[bitloc+32] != 0)
-                irq_handler(channel_ids[bitloc+32], IRQ_FALL); //Run that interrupt
-        
-        //Both clear the interrupt with clear register, and remove it from our local copy of the interrupt pending register
-        LPC_GPIOINT->IO2IntClr = 1 << bitloc;
-        fall2 -= 1<<bitloc;
-    }
-}
-
-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 = (int)pin & ~0x1F;
-    obj->pin = (int)pin & 0x1F;
-    
-    // Interrupts available only on GPIO0 and GPIO2
-    if (obj->port != LPC_GPIO0_BASE && obj->port != LPC_GPIO2_BASE) {
-        error("pins on this port cannot generate interrupts\n");
-    }
-    
-    // put us in the interrupt table
-    int index = (obj->port == LPC_GPIO0_BASE) ? obj->pin : obj->pin + 32;
-    channel_ids[index] = id;
-    obj->ch = index;
-    
-    NVIC_SetVector(EINT3_IRQn, (uint32_t)handle_interrupt_in);
-    NVIC_EnableIRQ(EINT3_IRQn);
-    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) {
-    // ensure nothing is pending
-    switch (obj->port) {
-         case LPC_GPIO0_BASE: LPC_GPIOINT->IO0IntClr = 1 << obj->pin; break;
-         case LPC_GPIO2_BASE: LPC_GPIOINT->IO2IntClr = 1 << obj->pin; break;
-    }
-
-    // enable the pin interrupt
-    if (event == IRQ_RISE) {
-        switch (obj->port) {
-            case LPC_GPIO0_BASE:
-                if (enable) {
-                    LPC_GPIOINT->IO0IntEnR |= 1 << obj->pin;
-                } else {
-                    LPC_GPIOINT->IO0IntEnR &= ~(1 << obj->pin);
-                }
-                break;
-            case LPC_GPIO2_BASE:
-                if (enable) {
-                    LPC_GPIOINT->IO2IntEnR |= 1 << obj->pin;
-                } else {
-                    LPC_GPIOINT->IO2IntEnR &= ~(1 << obj->pin);
-                }
-                break;
-        }
-    } else {
-        switch (obj->port) {
-            case LPC_GPIO0_BASE:
-                if (enable) {
-                    LPC_GPIOINT->IO0IntEnF |= 1 << obj->pin;
-                } else {
-                    LPC_GPIOINT->IO0IntEnF &= ~(1 << obj->pin);
-                }
-                break;
-            case LPC_GPIO2_BASE:
-                if (enable) {
-                    LPC_GPIOINT->IO2IntEnF |= 1 << obj->pin;
-                } else {
-                    LPC_GPIOINT->IO2IntEnF &= ~(1 << obj->pin);
-                }
-                break;
-        }
-    }
-}
-
-void gpio_irq_enable(gpio_irq_t *obj) {
-    NVIC_EnableIRQ(EINT3_IRQn);
-}
-
-void gpio_irq_disable(gpio_irq_t *obj) {
-    NVIC_DisableIRQ(EINT3_IRQn);
-}
-