tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_K20XX/gpio_irq_api.c

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2015 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 "mbed_error.h"
  21
  22 #define CHANNEL_NUM    160
  23
  24 static uint32_t channel_ids[CHANNEL_NUM] = {0};
  25 static gpio_irq_handler irq_handler;
  26
  27 #define IRQ_DISABLED        (0)
  28 #define IRQ_RAISING_EDGE    PORT_PCR_IRQC(9)
  29 #define IRQ_FALLING_EDGE    PORT_PCR_IRQC(10)
  30 #define IRQ_EITHER_EDGE     PORT_PCR_IRQC(11)
  31
  32 static void handle_interrupt_in(PORT_Type *port, int ch_base) {
  33     uint32_t isfr;
  34     uint32_t pin;
  35
  36     while ((isfr = port->ISFR) != 0) {
  37         pin = 31 - __CLZ(isfr);
  38         uint32_t id = channel_ids[ch_base + pin];
  39         if (id == 0) {
  40             continue;
  41         }
  42
  43         GPIO_Type *gpio = PTA;
  44         gpio_irq_event event = IRQ_NONE;
  45         uint32_t port_num = (port - PORTA) >> 12;
  46
  47         switch (port->PCR[pin] & PORT_PCR_IRQC_MASK) {
  48             case IRQ_RAISING_EDGE:
  49                 event = IRQ_RISE;
  50                 break;
  51             case IRQ_FALLING_EDGE:
  52                 event = IRQ_FALL;
  53                 break;
  54             case IRQ_EITHER_EDGE:
  55                 gpio += (port_num * 0x40);
  56                 event = (gpio->PDIR & (1 << pin)) ? (IRQ_RISE) : (IRQ_FALL);
  57                 break;
  58         }
  59         if (event != IRQ_NONE) {
  60             irq_handler(id, event);
  61         }
  62         port->ISFR = 1 << pin;
  63     }
  64 }
  65
  66 void gpio_irqA(void) {
  67     handle_interrupt_in(PORTA, 0);
  68 }
  69
  70 void gpio_irqB(void)
  71 {
  72     handle_interrupt_in(PORTB, 32);
  73 }
  74
  75 void gpio_irqC(void)
  76 {
  77     handle_interrupt_in(PORTC, 64);
  78 }
  79
  80 void gpio_irqD(void)
  81 {
  82     handle_interrupt_in(PORTD, 96);
  83 }
  84
  85 void gpio_irqE(void)
  86 {
  87     handle_interrupt_in(PORTE, 128);
  88 }
  89
  90
  91 int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id) {
  92     if (pin == NC)
  93         return -1;
  94
  95     irq_handler = handler;
  96
  97     obj->port = pin >> PORT_SHIFT;
  98     obj->pin = (pin & 0x7F) >> 2;
  99
 100     uint32_t ch_base, vector;
 101     IRQn_Type irq_n;
 102     switch (obj->port) {
 103         case PortA:
 104             ch_base = 0;
 105             irq_n = PORTA_IRQn;
 106             vector = (uint32_t)gpio_irqA;
 107             break;
 108         case PortB:
 109             ch_base = 32;
 110             irq_n = PORTB_IRQn;
 111             vector = (uint32_t)gpio_irqB;
 112             break;
 113         case PortC:
 114             ch_base = 64;
 115             irq_n = PORTC_IRQn;
 116             vector = (uint32_t)gpio_irqC;
 117             break;
 118         case PortD:
 119             ch_base = 96;
 120             irq_n = PORTD_IRQn; vector = (uint32_t)gpio_irqD;
 121             break;
 122         case PortE:
 123             ch_base = 128;
 124             irq_n = PORTE_IRQn;
 125             vector = (uint32_t)gpio_irqE;
 126             break;
 127
 128         default:
 129             error("gpio_irq only supported on port A-E.");
 130             break;
 131     }
 132     NVIC_SetVector(irq_n, vector);
 133     NVIC_EnableIRQ(irq_n);
 134
 135     obj->ch = ch_base + obj->pin;
 136     channel_ids[obj->ch] = id;
 137
 138     return 0;
 139 }
 140
 141 void gpio_irq_free(gpio_irq_t *obj) {
 142     channel_ids[obj->ch] = 0;
 143 }
 144
 145 void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable) {
 146     PORT_Type *port = (PORT_Type *)(PORTA_BASE + 0x1000 * obj->port);
 147
 148     uint32_t irq_settings = IRQ_DISABLED;
 149
 150     switch (port->PCR[obj->pin] & PORT_PCR_IRQC_MASK) {
 151         case IRQ_DISABLED:
 152             if (enable)
 153                 irq_settings = (event == IRQ_RISE) ? (IRQ_RAISING_EDGE) : (IRQ_FALLING_EDGE);
 154             break;
 155
 156         case IRQ_RAISING_EDGE:
 157             if (enable) {
 158                 irq_settings = (event == IRQ_RISE) ? (IRQ_RAISING_EDGE) : (IRQ_EITHER_EDGE);
 159             } else {
 160                 if (event == IRQ_FALL)
 161                     irq_settings = IRQ_RAISING_EDGE;
 162             }
 163             break;
 164
 165         case IRQ_FALLING_EDGE:
 166             if (enable) {
 167                 irq_settings = (event == IRQ_FALL) ? (IRQ_FALLING_EDGE) : (IRQ_EITHER_EDGE);
 168             } else {
 169                 if (event == IRQ_RISE)
 170                     irq_settings = IRQ_FALLING_EDGE;
 171             }
 172             break;
 173
 174         case IRQ_EITHER_EDGE:
 175             if (enable) {
 176                 irq_settings = IRQ_EITHER_EDGE;
 177             } else {
 178                 irq_settings = (event == IRQ_RISE) ? (IRQ_FALLING_EDGE) : (IRQ_RAISING_EDGE);
 179             }
 180             break;
 181     }
 182
 183     // Interrupt configuration and clear interrupt
 184     port->PCR[obj->pin] = (port->PCR[obj->pin] & ~PORT_PCR_IRQC_MASK) | irq_settings | PORT_PCR_ISF_MASK;
 185 }
 186
 187 void gpio_irq_enable(gpio_irq_t *obj) {
 188     switch (obj->port) {
 189         case PortA:
 190             NVIC_EnableIRQ(PORTA_IRQn);
 191             break;
 192         case PortB:
 193             NVIC_EnableIRQ(PORTB_IRQn);
 194             break;
 195         case PortC:
 196             NVIC_EnableIRQ(PORTC_IRQn);
 197             break;
 198         case PortD:
 199             NVIC_EnableIRQ(PORTD_IRQn);
 200             break;
 201         case PortE:
 202             NVIC_EnableIRQ(PORTE_IRQn);
 203             break;
 204     }
 205 }
 206
 207 void gpio_irq_disable(gpio_irq_t *obj) {
 208     switch (obj->port) {
 209         case PortA:
 210             NVIC_DisableIRQ(PORTA_IRQn);
 211             break;
 212         case PortB:
 213             NVIC_DisableIRQ(PORTB_IRQn);
 214             break;
 215         case PortC:
 216             NVIC_DisableIRQ(PORTC_IRQn);
 217             break;
 218         case PortD:
 219             NVIC_DisableIRQ(PORTD_IRQn);
 220             break;
 221         case PortE:
 222             NVIC_DisableIRQ(PORTE_IRQn);
 223             break;
 224     }
 225 }