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targets/hal/TARGET_Freescale/TARGET_KLXX/TARGET_KL25Z/gpio_irq_api.c
- Committer:
- mbed_official
- Date:
- 2014-03-10
- Revision:
- 113:65a335a675de
- Parent:
- 86:26fc69fd3b6c
File content as of revision 113:65a335a675de:
/* 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 "error.h" #define CHANNEL_NUM 64 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) static void handle_interrupt_in(PORT_Type *port, int ch_base) { uint32_t mask = 0, i; for (i = 0; i < 32; i++) { uint32_t pmask = (1 << i); if (port->ISFR & pmask) { mask |= pmask; uint32_t id = channel_ids[ch_base + i]; if (id == 0) { continue; } FGPIO_Type *gpio; gpio_irq_event event = IRQ_NONE; switch (port->PCR[i] & PORT_PCR_IRQC_MASK) { case IRQ_RAISING_EDGE: event = IRQ_RISE; break; case IRQ_FALLING_EDGE: event = IRQ_FALL; break; case IRQ_EITHER_EDGE: gpio = (port == PORTA) ? (FPTA) : (FPTD); event = (gpio->PDIR & pmask) ? (IRQ_RISE) : (IRQ_FALL); break; } if (event != IRQ_NONE) { irq_handler(id, event); } } } port->ISFR = mask; } void gpio_irqA(void) {handle_interrupt_in(PORTA, 0);} void gpio_irqD(void) {handle_interrupt_in(PORTD, 32);} 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 PortD: ch_base = 32; irq_n = PORTD_IRQn; vector = (uint32_t)gpio_irqD; break; default: error("gpio_irq only supported on port A and D\n"); 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 if (obj->port == PortD) { NVIC_EnableIRQ(PORTD_IRQn); } } void gpio_irq_disable(gpio_irq_t *obj) { if (obj->port == PortA) { NVIC_DisableIRQ(PORTA_IRQn); } else if (obj->port == PortD) { NVIC_DisableIRQ(PORTD_IRQn); } } // Change the NMI pin to an input. This allows NMI pin to // be used as a low power mode wakeup. The application will // need to change the pin back to NMI_b or wakeup only occurs once! void NMI_Handler(void) { gpio_t gpio; gpio_init_in(&gpio, PTA4); }