tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_KLXX/TARGET_KL25Z/gpio_irq_api.c

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2013 ARM Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #include <stddef.h>
  17 #include "cmsis.h"
  18
  19 #include "gpio_irq_api.h"
  20 #include "gpio_api.h"
  21 #include "mbed_error.h"
  22
  23 #define CHANNEL_NUM    64
  24
  25 static uint32_t channel_ids[CHANNEL_NUM] = {0};
  26 static gpio_irq_handler irq_handler;
  27
  28 #define IRQ_DISABLED        (0)
  29 #define IRQ_RAISING_EDGE    PORT_PCR_IRQC(9)
  30 #define IRQ_FALLING_EDGE    PORT_PCR_IRQC(10)
  31 #define IRQ_EITHER_EDGE     PORT_PCR_IRQC(11)
  32
  33 const uint32_t search_bits[] = {0x0000FFFF, 0x000000FF, 0x0000000F, 0x00000003, 0x00000001};
  34
  35 static void handle_interrupt_in(PORT_Type *port, int ch_base) {
  36     uint32_t isfr;
  37     uint8_t location;
  38
  39     while((isfr = port->ISFR) != 0) {
  40         location = 0;
  41         for (int i = 0; i < 5; i++) {
  42             if (!(isfr & (search_bits[i] << location)))
  43                 location += 1 << (4 - i);
  44         }
  45
  46         uint32_t id = channel_ids[ch_base + location];
  47         if (id == 0) {
  48             continue;
  49         }
  50
  51         FGPIO_Type *gpio;
  52         gpio_irq_event event = IRQ_NONE;
  53         switch (port->PCR[location] & PORT_PCR_IRQC_MASK) {
  54             case IRQ_RAISING_EDGE:
  55                 event = IRQ_RISE;
  56                 break;
  57
  58             case IRQ_FALLING_EDGE:
  59                 event = IRQ_FALL;
  60                 break;
  61
  62             case IRQ_EITHER_EDGE:
  63                 gpio = (port == PORTA) ? (FPTA) : (FPTD);
  64                 event = (gpio->PDIR & (1 << location)) ? (IRQ_RISE) : (IRQ_FALL);
  65                 break;
  66         }
  67         if (event != IRQ_NONE) {
  68             irq_handler(id, event);
  69         }
  70         port->ISFR = 1 << location;
  71     }
  72 }
  73
  74 void gpio_irqA(void) {handle_interrupt_in(PORTA, 0);}
  75 void gpio_irqD(void) {handle_interrupt_in(PORTD, 32);}
  76
  77 int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id) {
  78     if (pin == NC) return -1;
  79
  80     irq_handler = handler;
  81
  82     obj->port = pin >> PORT_SHIFT;
  83     obj->pin = (pin & 0x7F) >> 2;
  84
  85     uint32_t ch_base, vector;
  86     IRQn_Type irq_n;
  87     switch (obj->port) {
  88             case PortA:
  89                 ch_base = 0;  irq_n = PORTA_IRQn; vector = (uint32_t)gpio_irqA;
  90                 break;
  91
  92             case PortD:
  93                 ch_base = 32; irq_n = PORTD_IRQn; vector = (uint32_t)gpio_irqD;
  94                 break;
  95
  96             default:
  97                 error("gpio_irq only supported on port A and D");
  98                 break;
  99     }
 100     NVIC_SetVector(irq_n, vector);
 101     NVIC_EnableIRQ(irq_n);
 102
 103     obj->ch = ch_base + obj->pin;
 104     channel_ids[obj->ch] = id;
 105
 106     return 0;
 107 }
 108
 109 void gpio_irq_free(gpio_irq_t *obj) {
 110     channel_ids[obj->ch] = 0;
 111 }
 112
 113 void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable) {
 114     PORT_Type *port = (PORT_Type *)(PORTA_BASE + 0x1000 * obj->port);
 115
 116     uint32_t irq_settings = IRQ_DISABLED;
 117
 118     switch (port->PCR[obj->pin] & PORT_PCR_IRQC_MASK) {
 119         case IRQ_DISABLED:
 120             if (enable) {
 121                 irq_settings = (event == IRQ_RISE) ? (IRQ_RAISING_EDGE) : (IRQ_FALLING_EDGE);
 122             }
 123             break;
 124
 125         case IRQ_RAISING_EDGE:
 126             if (enable) {
 127                 irq_settings = (event == IRQ_RISE) ? (IRQ_RAISING_EDGE) : (IRQ_EITHER_EDGE);
 128             } else {
 129                 if (event == IRQ_FALL)
 130                     irq_settings = IRQ_RAISING_EDGE;
 131             }
 132             break;
 133
 134         case IRQ_FALLING_EDGE:
 135             if (enable) {
 136                 irq_settings = (event == IRQ_FALL) ? (IRQ_FALLING_EDGE) : (IRQ_EITHER_EDGE);
 137             } else {
 138                 if (event == IRQ_RISE)
 139                     irq_settings = IRQ_FALLING_EDGE;
 140             }
 141             break;
 142
 143         case IRQ_EITHER_EDGE:
 144             if (enable) {
 145                 irq_settings = IRQ_EITHER_EDGE;
 146             } else {
 147                 irq_settings = (event == IRQ_RISE) ? (IRQ_FALLING_EDGE) : (IRQ_RAISING_EDGE);
 148             }
 149             break;
 150     }
 151
 152     // Interrupt configuration and clear interrupt
 153     port->PCR[obj->pin] = (port->PCR[obj->pin] & ~PORT_PCR_IRQC_MASK) | irq_settings | PORT_PCR_ISF_MASK;
 154 }
 155
 156 void gpio_irq_enable(gpio_irq_t *obj) {
 157     if (obj->port == PortA) {
 158         NVIC_EnableIRQ(PORTA_IRQn);
 159     } else if (obj->port == PortD) {
 160         NVIC_EnableIRQ(PORTD_IRQn);
 161     }
 162 }
 163
 164 void gpio_irq_disable(gpio_irq_t *obj) {
 165     if (obj->port == PortA) {
 166         NVIC_DisableIRQ(PORTA_IRQn);
 167     } else if (obj->port == PortD) {
 168         NVIC_DisableIRQ(PORTD_IRQn);
 169     }
 170 }