tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32610/gpio_irq_api.c

   1 /*******************************************************************************
   2  * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
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   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
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  11  * The above copyright notice and this permission notice shall be included
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  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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  26  * The mere transfer of this software does not imply any licenses
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  32  */
  33
  34 #include <stddef.h>
  35 #include "cmsis.h"
  36 #include "gpio_irq_api.h"
  37 #include "mbed_error.h"
  38
  39 #define NUM_PORTS           3
  40 #define NUM_PINS_PER_PORT   8
  41
  42 static uint32_t ids[NUM_PORTS][NUM_PINS_PER_PORT] = {{0}};
  43 static gpio_irq_handler irq_handler;
  44
  45 static void handle_irq(unsigned int port)
  46 {
  47     uint32_t intfl, in_val;
  48     uint32_t mask;
  49     unsigned int pin;
  50
  51     /* Read pin state */
  52     in_val = MXC_GPIO->in_val[port];
  53
  54     /* Read interrupts */
  55     intfl = MXC_GPIO->intfl[port] & MXC_GPIO->inten[port];
  56
  57     mask = 1;
  58
  59     for (pin = 0; pin < NUM_PINS_PER_PORT; pin++) {
  60         if (intfl & mask) {
  61             if (ids[port][pin]) {
  62                 if (in_val & mask) {
  63                     irq_handler(ids[port][pin], IRQ_RISE);
  64                 } else {
  65                     irq_handler(ids[port][pin], IRQ_FALL);
  66                 }
  67             }
  68             MXC_GPIO->intfl[port] = mask;    /* clear interrupt */
  69         }
  70         mask <<= 1;
  71     }
  72 }
  73
  74 void gpio_irq_0(void)
  75 {
  76     handle_irq(0);
  77 }
  78
  79 void gpio_irq_1(void)
  80 {
  81     handle_irq(1);
  82 }
  83
  84 void gpio_irq_2(void)
  85 {
  86     handle_irq(2);
  87 }
  88
  89 int gpio_irq_init(gpio_irq_t *obj, PinName name, gpio_irq_handler handler, uint32_t id)
  90 {
  91     if (name == NC)
  92         return -1;
  93
  94     uint8_t port = PINNAME_TO_PORT(name);
  95     uint8_t pin = PINNAME_TO_PIN(name);
  96
  97     if ((port > NUM_PORTS) || (pin > NUM_PINS_PER_PORT)) {
  98         return 1;
  99     }
 100
 101     obj->port = port;
 102     obj->pin = pin;
 103
 104     irq_handler = handler;
 105
 106     ids[port][pin] = id;
 107
 108     /* register handlers */
 109     NVIC_SetVector(GPIO_P0_IRQn, (uint32_t)gpio_irq_0);
 110     NVIC_SetVector(GPIO_P1_IRQn, (uint32_t)gpio_irq_1);
 111     NVIC_SetVector(GPIO_P2_IRQn, (uint32_t)gpio_irq_2);
 112
 113     /* disable the interrupt locally */
 114     MXC_GPIO->int_mode[port] &= ~(0xF << (pin*4));
 115
 116     /* clear a pending request */
 117     MXC_GPIO->intfl[port] = 1 << pin;
 118
 119     /* enable the requested interrupt */
 120     MXC_GPIO->inten[port] |= (1 << pin);
 121     NVIC_EnableIRQ((IRQn_Type)((uint32_t)GPIO_P0_IRQn + port));
 122
 123     return 0;
 124 }
 125
 126 void gpio_irq_free(gpio_irq_t *obj)
 127 {
 128     /* disable interrupt */
 129     MXC_GPIO->inten[obj->port] &= ~(1 << obj->pin);
 130     MXC_GPIO->int_mode[obj->port] &= ~(0xF << (obj->pin*4));
 131
 132     ids[obj->port][obj->pin] = 0;
 133 }
 134
 135 void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable)
 136 {
 137     uint32_t int_mode = MXC_GPIO->int_mode[obj->port];
 138     uint32_t curr_mode = (int_mode >> (obj->pin*4)) & 0x3;   /* only supporting edge interrupts */
 139
 140     uint32_t new_mode = curr_mode;
 141     if (event == IRQ_FALL) {
 142         if (enable) {
 143             new_mode |= 0x1;
 144         } else {
 145             new_mode &= ~0x1;
 146         }
 147     } else if (event == IRQ_RISE) {
 148         if (enable) {
 149             new_mode |= 0x2;
 150         } else {
 151             new_mode &= ~0x2;
 152         }
 153     }
 154
 155     int_mode &= ~(0xF << (obj->pin*4));
 156     int_mode |= (new_mode << (obj->pin*4));
 157     MXC_GPIO->int_mode[obj->port] = int_mode;
 158 }
 159
 160 void gpio_irq_enable(gpio_irq_t *obj)
 161 {
 162     MXC_GPIO->inten[obj->port] |= (1 << obj->pin);
 163 }
 164
 165 void gpio_irq_disable(gpio_irq_t *obj)
 166 {
 167     MXC_GPIO->inten[obj->port] &= ~(1 << obj->pin);
 168 }