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/* 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 96
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;
}
GPIO_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:
if (port == PORTA) {
gpio = GPIOA;
} else if (port == PORTC) {
gpio = GPIOC;
} else {
gpio = GPIOD;
}
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);
}
/* PORTC and PORTD share same vector */
void gpio_irqCD(void) {
if ((SIM->SCGC5 & SIM_SCGC5_PORTC_MASK) && (PORTC->ISFR)) {
handle_interrupt_in(PORTC, 32);
} else if ((SIM->SCGC5 & SIM_SCGC5_PORTD_MASK) && (PORTD->ISFR)) {
handle_interrupt_in(PORTD, 64);
}
}
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 PortC:
ch_base = 32; irq_n = PORTCD_IRQn; vector = (uint32_t)gpio_irqCD;
break;
case PortD:
ch_base = 64; irq_n = PORTCD_IRQn; vector = (uint32_t)gpio_irqCD;
break;
default:
error("gpio_irq only supported on port A,C 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 {
NVIC_EnableIRQ(PORTCD_IRQn);
}
}
void gpio_irq_disable(gpio_irq_t *obj) {
if (obj->port == PortA) {
NVIC_DisableIRQ(PORTA_IRQn);
} else {
NVIC_DisableIRQ(PORTCD_IRQn);
}
}
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