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targets/TARGET_Maxim/TARGET_MAX32625/gpio_irq_api.c
- Committer:
- <>
- Date:
- 2016-11-08
- Revision:
- 150:02e0a0aed4ec
File content as of revision 150:02e0a0aed4ec:
/******************************************************************************* * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Except as contained in this notice, the name of Maxim Integrated * Products, Inc. shall not be used except as stated in the Maxim Integrated * Products, Inc. Branding Policy. * * The mere transfer of this software does not imply any licenses * of trade secrets, proprietary technology, copyrights, patents, * trademarks, maskwork rights, or any other form of intellectual * property whatsoever. Maxim Integrated Products, Inc. retains all * ownership rights. ******************************************************************************* */ #include <stddef.h> #include "cmsis.h" #include "gpio_irq_api.h" #include "mbed_error.h" static gpio_irq_t *objs[MXC_GPIO_NUM_PORTS][MXC_GPIO_MAX_PINS_PER_PORT] = {{0}}; static gpio_irq_handler irq_handler; static void handle_irq(unsigned int port) { uint32_t intfl, in_val; uint32_t mask; unsigned int pin; /* Read pin state */ in_val = MXC_GPIO->in_val[port]; /* Read interrupts */ intfl = MXC_GPIO->intfl[port] & MXC_GPIO->inten[port]; mask = 1; for (pin = 0; pin < MXC_GPIO_MAX_PINS_PER_PORT; pin++) { if (intfl & mask) { MXC_GPIO->intfl[port] = mask; /* clear interrupt */ gpio_irq_event event = (in_val & mask) ? IRQ_RISE : IRQ_FALL; gpio_irq_t *obj = objs[port][pin]; if (obj && obj->id) { if ((event == IRQ_RISE) && obj->rise_en) { irq_handler(obj->id, IRQ_RISE); } else if ((event == IRQ_FALL) && obj->fall_en) { irq_handler(obj->id, IRQ_FALL); } } } mask <<= 1; } } void gpio_irq_0(void) { handle_irq(0); } void gpio_irq_1(void) { handle_irq(1); } void gpio_irq_2(void) { handle_irq(2); } void gpio_irq_3(void) { handle_irq(3); } void gpio_irq_4(void) { handle_irq(4); } int gpio_irq_init(gpio_irq_t *obj, PinName name, gpio_irq_handler handler, uint32_t id) { if (name == NC) { return -1; } uint8_t port = PINNAME_TO_PORT(name); uint8_t pin = PINNAME_TO_PIN(name); if ((port > MXC_GPIO_NUM_PORTS) || (pin > MXC_GPIO_MAX_PINS_PER_PORT)) { return 1; } obj->port = port; obj->pin = pin; obj->id = id; objs[port][pin] = obj; /* register handlers */ irq_handler = handler; NVIC_SetVector(GPIO_P0_IRQn, (uint32_t)gpio_irq_0); NVIC_SetVector(GPIO_P1_IRQn, (uint32_t)gpio_irq_1); NVIC_SetVector(GPIO_P2_IRQn, (uint32_t)gpio_irq_2); NVIC_SetVector(GPIO_P3_IRQn, (uint32_t)gpio_irq_3); NVIC_SetVector(GPIO_P4_IRQn, (uint32_t)gpio_irq_4); /* disable the interrupt locally */ MXC_GPIO->int_mode[port] &= ~(0xF << (pin*4)); /* clear a pending request */ MXC_GPIO->intfl[port] = 1 << pin; /* enable the requested interrupt */ MXC_GPIO->inten[port] |= (1 << pin); NVIC_EnableIRQ((IRQn_Type)((uint32_t)GPIO_P0_IRQn + port)); return 0; } void gpio_irq_free(gpio_irq_t *obj) { /* disable interrupt */ MXC_GPIO->inten[obj->port] &= ~(1 << obj->pin); MXC_GPIO->int_mode[obj->port] &= ~(MXC_V_GPIO_INT_MODE_ANY_EDGE << (obj->pin*4)); objs[obj->port][obj->pin] = NULL; } void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable) { if (event == IRQ_FALL) { obj->fall_en = enable; } else if (event == IRQ_RISE) { obj->rise_en = enable; } if (obj->fall_en && obj->rise_en) { MXC_GPIO->int_mode[obj->port] |= (MXC_V_GPIO_INT_MODE_ANY_EDGE << (obj->pin*4)); } else if (obj->fall_en) { uint32_t int_mode = MXC_GPIO->int_mode[obj->port]; int_mode &= ~(MXC_V_GPIO_INT_MODE_ANY_EDGE << (obj->pin*4)); int_mode |= (MXC_V_GPIO_INT_MODE_FALLING_EDGE << (obj->pin*4)); MXC_GPIO->int_mode[obj->port] = int_mode; } else if (obj->rise_en) { uint32_t int_mode = MXC_GPIO->int_mode[obj->port]; int_mode &= ~(MXC_V_GPIO_INT_MODE_ANY_EDGE << (obj->pin*4)); int_mode |= (MXC_V_GPIO_INT_MODE_RISING_EDGE << (obj->pin*4)); MXC_GPIO->int_mode[obj->port] = int_mode; } else { MXC_GPIO->int_mode[obj->port] &= ~(MXC_V_GPIO_INT_MODE_ANY_EDGE << (obj->pin*4)); } } void gpio_irq_enable(gpio_irq_t *obj) { MXC_GPIO->inten[obj->port] |= (1 << obj->pin); } void gpio_irq_disable(gpio_irq_t *obj) { MXC_GPIO->inten[obj->port] &= ~(1 << obj->pin); } gpio_irq_t *gpio_irq_get_obj(PinName name) { if (name == NC) { return NULL; } unsigned int port = PINNAME_TO_PORT(name); unsigned int pin = PINNAME_TO_PIN(name); if ((port > MXC_GPIO_NUM_PORTS) || (pin > MXC_GPIO_MAX_PINS_PER_PORT)) { return NULL; } return objs[port][pin]; }