Mouse code for the MacroRat
mbed-dev/targets/TARGET_Freescale/TARGET_KLXX/TARGET_KL46Z/gpio_irq_api.c
- Committer:
- sahilmgandhi
- Date:
- 2017-05-14
- Revision:
- 18:6a4db94011d3
File content as of revision 18:6a4db94011d3:
/* 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 "mbed_error.h" #define CHANNEL_NUM 96 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) const uint32_t search_bits[] = {0x0000FFFF, 0x000000FF, 0x0000000F, 0x00000003, 0x00000001}; static void handle_interrupt_in(PORT_Type *port, int ch_base) { uint32_t isfr; uint8_t location; while((isfr = port->ISFR) != 0) { location = 0; for (int i = 0; i < 5; i++) { if (!(isfr & (search_bits[i] << location))) location += 1 << (4 - i); } uint32_t id = channel_ids[ch_base + location]; if (id == 0) { continue; } FGPIO_Type *gpio; gpio_irq_event event = IRQ_NONE; switch (port->PCR[location] & PORT_PCR_IRQC_MASK) { case IRQ_RAISING_EDGE: event = IRQ_RISE; break; case IRQ_FALLING_EDGE: event = IRQ_FALL; break; case IRQ_EITHER_EDGE: if (port == PORTA) { gpio = FPTA; } else if (port == PORTC) { gpio = FPTC; } else { gpio = FPTD; } event = (gpio->PDIR & (1<<location)) ? (IRQ_RISE) : (IRQ_FALL); break; } if (event != IRQ_NONE) { irq_handler(id, event); } port->ISFR = 1 << location; } } void gpio_irqA(void) { handle_interrupt_in(PORTA, 0); } /* PORTC and PORTD share same vector */ void gpio_irqCD(void) { if ((SIM->SCGC5 & SIM_SCGC5_PORTC_MASK) && (PORTC->ISFR)) { handle_interrupt_in(PORTC, 32); } else if ((SIM->SCGC5 & SIM_SCGC5_PORTD_MASK) && (PORTD->ISFR)) { handle_interrupt_in(PORTD, 64); } } 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 PortC: ch_base = 32; irq_n = PORTC_PORTD_IRQn; vector = (uint32_t)gpio_irqCD; break; case PortD: ch_base = 64; irq_n = PORTC_PORTD_IRQn; vector = (uint32_t)gpio_irqCD; break; default: error("gpio_irq only supported on port A,C and D"); 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 { NVIC_EnableIRQ(PORTC_PORTD_IRQn); } } void gpio_irq_disable(gpio_irq_t *obj) { if (obj->port == PortA) { NVIC_DisableIRQ(PORTA_IRQn); } else { NVIC_DisableIRQ(PORTC_PORTD_IRQn); } }