Mouse code for the MacroRat
Diff: mbed-dev/targets/TARGET_NORDIC/TARGET_MCU_NRF51822/gpio_irq_api.c
- Revision:
- 18:6a4db94011d3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-dev/targets/TARGET_NORDIC/TARGET_MCU_NRF51822/gpio_irq_api.c Sun May 14 23:18:57 2017 +0000 @@ -0,0 +1,127 @@ +/* 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; +}