/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * SPDX-License-Identifier: Apache-2.0 * * 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" #if DEVICE_INTERRUPTIN #include "gpio_api.h" #include "fsl_gpio.h" #include "fsl_port.h" #include "mbed_error.h" #define CHANNEL_NUM 160 static uintptr_t channel_contexts[CHANNEL_NUM] = {0}; static gpio_irq_handler irq_handler; /* Array of PORT peripheral base address. */ static PORT_Type *const port_addrs[] = PORT_BASE_PTRS; /* Array of PORT IRQ number. */ static const IRQn_Type port_irqs[] = PORT_IRQS; #define IRQ_DISABLED (0) #define IRQ_RAISING_EDGE (9) #define IRQ_FALLING_EDGE (10) #define IRQ_EITHER_EDGE (11) static void handle_interrupt_in(PortName port, int ch_base) { uint32_t i; uint32_t interrupt_flags; PORT_Type *port_base = port_addrs[port]; interrupt_flags = PORT_GetPinsInterruptFlags(port_base); for (i = 0; i < 32; i++) { if (interrupt_flags & (1 << i)) { uintptr_t context = channel_contexts[ch_base + i]; if (context == 0) { continue; } gpio_irq_event event = IRQ_NONE; GPIO_Type *gpio_addrs[] = GPIO_BASE_PTRS; GPIO_Type *gpio_base = gpio_addrs[port]; switch ((port_base->PCR[i] & PORT_PCR_IRQC_MASK) >> PORT_PCR_IRQC_SHIFT) { case IRQ_RAISING_EDGE: event = IRQ_RISE; break; case IRQ_FALLING_EDGE: event = IRQ_FALL; break; case IRQ_EITHER_EDGE: event = (GPIO_ReadPinInput(gpio_base, i)) ? (IRQ_RISE) : (IRQ_FALL); break; } if (event != IRQ_NONE) { irq_handler(context, event); } } } PORT_ClearPinsInterruptFlags(port_base, interrupt_flags); } void gpio_irqA(void) { handle_interrupt_in(PortA, 0); } void gpio_irqB(void) { handle_interrupt_in(PortB, 32); } void gpio_irqC(void) { handle_interrupt_in(PortC, 64); } void gpio_irqD(void) { handle_interrupt_in(PortD, 96); } void gpio_irqE(void) { handle_interrupt_in(PortE, 128); } int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uintptr_t context) { if (pin == NC) { return -1; } irq_handler = handler; obj->port = pin >> GPIO_PORT_SHIFT; obj->pin = pin & 0x7F; uint32_t ch_base = 0; uint32_t vector = (uint32_t)gpio_irqA; switch (obj->port) { case PortA: ch_base = 0; vector = (uint32_t)gpio_irqA; break; case PortB: ch_base = 32; vector = (uint32_t)gpio_irqB; break; case PortC: ch_base = 64; vector = (uint32_t)gpio_irqC; break; case PortD: ch_base = 96; vector = (uint32_t)gpio_irqD; break; case PortE: ch_base = 128; vector = (uint32_t)gpio_irqE; break; default: error("gpio_irq only supported on port A-E."); break; } NVIC_SetVector(port_irqs[obj->port], vector); NVIC_EnableIRQ(port_irqs[obj->port]); obj->ch = ch_base + obj->pin; channel_contexts[obj->ch] = context; return 0; } void gpio_irq_free(gpio_irq_t *obj) { channel_contexts[obj->ch] = 0; } void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable) { PORT_Type *base = port_addrs[obj->port]; port_interrupt_t irq_settings = kPORT_InterruptOrDMADisabled; switch ((base->PCR[obj->pin] & PORT_PCR_IRQC_MASK) >> PORT_PCR_IRQC_SHIFT) { case IRQ_DISABLED: if (enable) irq_settings = (event == IRQ_RISE) ? (kPORT_InterruptRisingEdge) : (kPORT_InterruptFallingEdge); break; case IRQ_RAISING_EDGE: if (enable) { irq_settings = (event == IRQ_RISE) ? (kPORT_InterruptRisingEdge) : (kPORT_InterruptEitherEdge); } else { if (event == IRQ_FALL) irq_settings = kPORT_InterruptRisingEdge; } break; case IRQ_FALLING_EDGE: if (enable) { irq_settings = (event == IRQ_FALL) ? (kPORT_InterruptFallingEdge) : (kPORT_InterruptEitherEdge); } else { if (event == IRQ_RISE) irq_settings = kPORT_InterruptFallingEdge; } break; case IRQ_EITHER_EDGE: if (enable) { irq_settings = kPORT_InterruptEitherEdge; } else { irq_settings = (event == IRQ_RISE) ? (kPORT_InterruptFallingEdge) : (kPORT_InterruptRisingEdge); } break; } PORT_SetPinInterruptConfig(base, obj->pin, irq_settings); base->PCR[obj->pin] |= PORT_PCR_ISF_MASK; } void gpio_irq_enable(gpio_irq_t *obj) { NVIC_EnableIRQ(port_irqs[obj->port]); } void gpio_irq_disable(gpio_irq_t *obj) { NVIC_DisableIRQ(port_irqs[obj->port]); } #endif