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/* mbed Microcontroller Library
* Copyright (c) 2013 Nordic Semiconductor
*
* 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 "mbed_error.h"
#define CHANNEL_NUM 31
static uint32_t channel_ids[CHANNEL_NUM] = {0}; //each pin will be given an id, if id is 0 the pin can be ignored.
static uint8_t channel_enabled[CHANNEL_NUM] = {0};
static uint32_t portRISE = 0;
static uint32_t portFALL = 0;
static gpio_irq_handler irq_handler;
#ifdef __cplusplus
extern "C" {
#endif
void GPIOTE_IRQHandler(void)
{
volatile uint32_t newVal = NRF_GPIO->IN;
if ((NRF_GPIOTE->EVENTS_PORT != 0) && ((NRF_GPIOTE->INTENSET & GPIOTE_INTENSET_PORT_Msk) != 0)) {
NRF_GPIOTE->EVENTS_PORT = 0;
for (uint8_t i = 0; i<31; i++) {
if (channel_ids[i]>0) {
if (channel_enabled[i]) {
if( ((newVal>>i)&1) && ( ( (NRF_GPIO->PIN_CNF[i] >>GPIO_PIN_CNF_SENSE_Pos) & GPIO_PIN_CNF_SENSE_Low) != GPIO_PIN_CNF_SENSE_Low) && ( (portRISE>>i)&1) ){
irq_handler(channel_ids[i], IRQ_RISE);
} else if ((((newVal >> i) & 1) == 0) &&
(((NRF_GPIO->PIN_CNF[i] >> GPIO_PIN_CNF_SENSE_Pos) & GPIO_PIN_CNF_SENSE_Low) == GPIO_PIN_CNF_SENSE_Low) &&
((portFALL >> i) & 1)) {
irq_handler(channel_ids[i], IRQ_FALL);
}
}
if (NRF_GPIO->PIN_CNF[i] & GPIO_PIN_CNF_SENSE_Msk) {
NRF_GPIO->PIN_CNF[i] &= ~(GPIO_PIN_CNF_SENSE_Msk);
if (newVal >> i & 1) {
NRF_GPIO->PIN_CNF[i] |= (GPIO_PIN_CNF_SENSE_Low << GPIO_PIN_CNF_SENSE_Pos);
} else {
NRF_GPIO->PIN_CNF[i] |= (GPIO_PIN_CNF_SENSE_High << GPIO_PIN_CNF_SENSE_Pos);
}
}
}
}
}
}
#ifdef __cplusplus
}
#endif
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->ch = pin;
NRF_GPIOTE->EVENTS_PORT = 0;
channel_ids[pin] = id;
channel_enabled[pin] = 1;
NRF_GPIOTE->INTENSET = GPIOTE_INTENSET_PORT_Set << GPIOTE_INTENSET_PORT_Pos;
NVIC_SetPriority(GPIOTE_IRQn, 3);
NVIC_EnableIRQ (GPIOTE_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)
{
NRF_GPIO->PIN_CNF[obj->ch] &= ~(GPIO_PIN_CNF_SENSE_Msk);
if (enable) {
if (event == IRQ_RISE) {
portRISE |= (1 << obj->ch);
} else if (event == IRQ_FALL) {
portFALL |= (1 << obj->ch);
}
} else {
if (event == IRQ_RISE) {
portRISE &= ~(1 << obj->ch);
} else if (event == IRQ_FALL) {
portFALL &= ~(1 << obj->ch);
}
}
if (((portRISE >> obj->ch) & 1) || ((portFALL >> obj->ch) & 1)) {
if ((NRF_GPIO->IN >> obj->ch) & 1) {
NRF_GPIO->PIN_CNF[obj->ch] |= (GPIO_PIN_CNF_SENSE_Low << GPIO_PIN_CNF_SENSE_Pos); // | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos);
} else {
NRF_GPIO->PIN_CNF[obj->ch] |= (GPIO_PIN_CNF_SENSE_High << GPIO_PIN_CNF_SENSE_Pos); //| (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos);
}
}
}
void gpio_irq_enable(gpio_irq_t *obj)
{
channel_enabled[obj->ch] = 1;
}
void gpio_irq_disable(gpio_irq_t *obj)
{
channel_enabled[obj->ch] = 0;
}