mbed library sources. Supersedes mbed-src.
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Diff: targets/hal/TARGET_NXP/TARGET_LPC82X/gpio_irq_api.c
- Revision:
- 0:9b334a45a8ff
- Child:
- 144:ef7eb2e8f9f7
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_NXP/TARGET_LPC82X/gpio_irq_api.c Thu Oct 01 15:25:22 2015 +0300 @@ -0,0 +1,145 @@ +/* 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 "mbed_error.h" + +#if DEVICE_INTERRUPTIN + +#define CHANNEL_NUM 8 +#define LPC_GPIO_X LPC_PIN_INT +#define PININT_IRQ PIN_INT0_IRQn + +static uint32_t channel_ids[CHANNEL_NUM] = {0}; +static gpio_irq_handler irq_handler; + +static inline void handle_interrupt_in(uint32_t channel) +{ + uint32_t ch_bit = (1 << channel); + // Return immediately if: + // * The interrupt was already served + // * There is no user handler + // * It is a level interrupt, not an edge interrupt + if ( ((LPC_GPIO_X->IST & ch_bit) == 0) || + (channel_ids[channel] == 0 ) || + (LPC_GPIO_X->ISEL & ch_bit ) ) return; + + if ((LPC_GPIO_X->IENR & ch_bit) && (LPC_GPIO_X->RISE & ch_bit)) { + irq_handler(channel_ids[channel], IRQ_RISE); + LPC_GPIO_X->RISE = ch_bit; + } + if ((LPC_GPIO_X->IENF & ch_bit) && (LPC_GPIO_X->FALL & ch_bit)) { + irq_handler(channel_ids[channel], IRQ_FALL); + } + LPC_GPIO_X->IST = ch_bit; +} + +void gpio_irq0(void) {handle_interrupt_in(0);} +void gpio_irq1(void) {handle_interrupt_in(1);} +void gpio_irq2(void) {handle_interrupt_in(2);} +void gpio_irq3(void) {handle_interrupt_in(3);} +void gpio_irq4(void) {handle_interrupt_in(4);} +void gpio_irq5(void) {handle_interrupt_in(5);} +void gpio_irq6(void) {handle_interrupt_in(6);} +void gpio_irq7(void) {handle_interrupt_in(7);} + +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; + + int found_free_channel = 0; + int i = 0; + for (i=0; i<CHANNEL_NUM; i++) { + if (channel_ids[i] == 0) { + channel_ids[i] = id; + obj->ch = i; + found_free_channel = 1; + break; + } + } + if (!found_free_channel) return -1; + + /* Enable AHB clock to the GPIO domain. */ + LPC_SYSCON->SYSAHBCLKCTRL |= (1<<6); + + LPC_SYSCON->PINTSEL[obj->ch] = (pin >> PIN_SHIFT); + + // Interrupt Wake-Up Enable + LPC_SYSCON->STARTERP0 |= 1 << obj->ch; + + void (*channels_irq)(void) = NULL; + switch (obj->ch) { + case 0: channels_irq = &gpio_irq0; break; + case 1: channels_irq = &gpio_irq1; break; + case 2: channels_irq = &gpio_irq2; break; + case 3: channels_irq = &gpio_irq3; break; + case 4: channels_irq = &gpio_irq4; break; + case 5: channels_irq = &gpio_irq5; break; + case 6: channels_irq = &gpio_irq6; break; + case 7: channels_irq = &gpio_irq7; break; + } + NVIC_SetVector((IRQn_Type)(PININT_IRQ + obj->ch), (uint32_t)channels_irq); + NVIC_EnableIRQ((IRQn_Type)(PININT_IRQ + obj->ch)); + + return 0; +} + +void gpio_irq_free(gpio_irq_t *obj) +{ + channel_ids[obj->ch] = 0; + LPC_SYSCON->STARTERP0 &= ~(1 << obj->ch); +} + +void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable) +{ + unsigned int ch_bit = (1 << obj->ch); + + // Clear interrupt + if (!(LPC_GPIO_X->ISEL & ch_bit)) + LPC_GPIO_X->IST = ch_bit; + + // Edge trigger + LPC_GPIO_X->ISEL &= ~ch_bit; + if (event == IRQ_RISE) { + if (enable) { + LPC_GPIO_X->IENR |= ch_bit; + } else { + LPC_GPIO_X->IENR &= ~ch_bit; + } + } else { + if (enable) { + LPC_GPIO_X->IENF |= ch_bit; + } else { + LPC_GPIO_X->IENF &= ~ch_bit; + } + } +} + +void gpio_irq_enable(gpio_irq_t *obj) +{ + NVIC_EnableIRQ((IRQn_Type)(PININT_IRQ + obj->ch)); +} + +void gpio_irq_disable(gpio_irq_t *obj) +{ + NVIC_DisableIRQ((IRQn_Type)(PININT_IRQ + obj->ch)); +} + +#endif