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Diff: targets/TARGET_Maxim/TARGET_MAX32610/gpio_irq_api.c
- Revision:
- 149:156823d33999
- Parent:
- 144:ef7eb2e8f9f7
diff -r 21d94c44109e -r 156823d33999 targets/TARGET_Maxim/TARGET_MAX32610/gpio_irq_api.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/TARGET_Maxim/TARGET_MAX32610/gpio_irq_api.c Fri Oct 28 11:17:30 2016 +0100 @@ -0,0 +1,168 @@ +/******************************************************************************* + * Copyright (C) 2015 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" + +#define NUM_PORTS 3 +#define NUM_PINS_PER_PORT 8 + +static uint32_t ids[NUM_PORTS][NUM_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 < NUM_PINS_PER_PORT; pin++) { + if (intfl & mask) { + if (ids[port][pin]) { + if (in_val & mask) { + irq_handler(ids[port][pin], IRQ_RISE); + } else { + irq_handler(ids[port][pin], IRQ_FALL); + } + } + MXC_GPIO->intfl[port] = mask; /* clear interrupt */ + } + 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); +} + +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 > NUM_PORTS) || (pin > NUM_PINS_PER_PORT)) { + return 1; + } + + obj->port = port; + obj->pin = pin; + + irq_handler = handler; + + ids[port][pin] = id; + + /* register handlers */ + 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); + + /* 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] &= ~(0xF << (obj->pin*4)); + + ids[obj->port][obj->pin] = 0; +} + +void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable) +{ + uint32_t int_mode = MXC_GPIO->int_mode[obj->port]; + uint32_t curr_mode = (int_mode >> (obj->pin*4)) & 0x3; /* only supporting edge interrupts */ + + uint32_t new_mode = curr_mode; + if (event == IRQ_FALL) { + if (enable) { + new_mode |= 0x1; + } else { + new_mode &= ~0x1; + } + } else if (event == IRQ_RISE) { + if (enable) { + new_mode |= 0x2; + } else { + new_mode &= ~0x2; + } + } + + int_mode &= ~(0xF << (obj->pin*4)); + int_mode |= (new_mode << (obj->pin*4)); + MXC_GPIO->int_mode[obj->port] = int_mode; +} + +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); +}