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mbed SDK library sources

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Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_NXP/TARGET_LPC11XX_11CXX/gpio_irq_api.c@89:9655231f5786, 2014-02-11 (annotated)

Committer:
mbed_official
Date:
Tue Feb 11 15:00:06 2014 +0000
Revision:
89:9655231f5786
Parent:
35:371630885ad6 
Synchronized with git revision 17499c34d273f02497e0706d3abc516b12f3fc62



Full URL: https://github.com/mbedmicro/mbed/commit/17499c34d273f02497e0706d3abc516b12f3fc62/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 30:91c1d09ada54 1 /* mbed Microcontroller Library
mbed_official 30:91c1d09ada54 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 30:91c1d09ada54 3 *
mbed_official 30:91c1d09ada54 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 30:91c1d09ada54 5 * you may not use this file except in compliance with the License.
mbed_official 30:91c1d09ada54 6 * You may obtain a copy of the License at
mbed_official 30:91c1d09ada54 7 *
mbed_official 30:91c1d09ada54 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 30:91c1d09ada54 9 *
mbed_official 30:91c1d09ada54 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 30:91c1d09ada54 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 30:91c1d09ada54 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 30:91c1d09ada54 13 * See the License for the specific language governing permissions and
mbed_official 30:91c1d09ada54 14 * limitations under the License.
mbed_official 30:91c1d09ada54 15 */
mbed_official 30:91c1d09ada54 16 #include <stddef.h>
mbed_official 30:91c1d09ada54 17 #include "cmsis.h"
mbed_official 30:91c1d09ada54 18 #include "gpio_irq_api.h"
mbed_official 30:91c1d09ada54 19 #include "error.h"
mbed_official 30:91c1d09ada54 20 #include "gpio_api.h"
mbed_official 30:91c1d09ada54 21
mbed_official 30:91c1d09ada54 22 // The chip is capable of 42 GPIO interrupts.
mbed_official 30:91c1d09ada54 23 // PIO0_0..PIO0_11, PIO1_0..PIO1_11, PIO2_0..PIO2_11, PIO3_0..PIO3_5
mbed_official 30:91c1d09ada54 24 #define CHANNEL_NUM 42
mbed_official 30:91c1d09ada54 25
mbed_official 30:91c1d09ada54 26 static uint32_t channel_ids[CHANNEL_NUM] = {0};
mbed_official 30:91c1d09ada54 27 static gpio_irq_handler irq_handler;
mbed_official 30:91c1d09ada54 28
mbed_official 30:91c1d09ada54 29 static inline int numofbits(uint32_t bits)
mbed_official 30:91c1d09ada54 30 {
mbed_official 30:91c1d09ada54 31 // Count number of bits
mbed_official 30:91c1d09ada54 32 bits = (bits & 0x55555555) + (bits >> 1 & 0x55555555);
mbed_official 30:91c1d09ada54 33 bits = (bits & 0x33333333) + (bits >> 2 & 0x33333333);
mbed_official 30:91c1d09ada54 34 bits = (bits & 0x0f0f0f0f) + (bits >> 4 & 0x0f0f0f0f);
mbed_official 30:91c1d09ada54 35 bits = (bits & 0x00ff00ff) + (bits >> 8 & 0x00ff00ff);
mbed_official 30:91c1d09ada54 36 return (bits & 0x0000ffff) + (bits >>16 & 0x0000ffff);
mbed_official 30:91c1d09ada54 37 }
mbed_official 30:91c1d09ada54 38
mbed_official 30:91c1d09ada54 39 static inline void handle_interrupt_in(uint32_t port) {
mbed_official 30:91c1d09ada54 40 // Find out whether the interrupt has been triggered by a high or low value...
mbed_official 30:91c1d09ada54 41 // As the LPC1114 doesn't have a specific register for this, we'll just have to read
mbed_official 30:91c1d09ada54 42 // the level of the pin as if it were just a normal input...
mbed_official 30:91c1d09ada54 43
mbed_official 30:91c1d09ada54 44 uint32_t channel;
mbed_official 30:91c1d09ada54 45
mbed_official 30:91c1d09ada54 46 // Get the number of the pin being used and the port typedef
mbed_official 30:91c1d09ada54 47 LPC_GPIO_TypeDef *port_reg = ((LPC_GPIO_TypeDef *) (LPC_GPIO0_BASE + (port * 0x10000)));
mbed_official 30:91c1d09ada54 48
mbed_official 30:91c1d09ada54 49 // Get index of function table from Mask Interrupt Status register
mbed_official 30:91c1d09ada54 50 channel = numofbits(port_reg->MIS - 1);
mbed_official 30:91c1d09ada54 51
mbed_official 30:91c1d09ada54 52 if (port_reg->MIS & port_reg->IBE) {
mbed_official 30:91c1d09ada54 53 // both edge, read the level of pin
mbed_official 30:91c1d09ada54 54 if ((port_reg->DATA & port_reg->MIS) != 0)
mbed_official 30:91c1d09ada54 55 irq_handler(channel_ids[channel], IRQ_RISE);
mbed_official 30:91c1d09ada54 56 else
mbed_official 30:91c1d09ada54 57 irq_handler(channel_ids[channel], IRQ_FALL);
mbed_official 30:91c1d09ada54 58 }
mbed_official 30:91c1d09ada54 59 else if (port_reg->MIS & port_reg->IEV) {
mbed_official 30:91c1d09ada54 60 irq_handler(channel_ids[channel], IRQ_RISE);
mbed_official 30:91c1d09ada54 61 }
mbed_official 30:91c1d09ada54 62 else {
mbed_official 30:91c1d09ada54 63 irq_handler(channel_ids[channel], IRQ_FALL);
mbed_official 30:91c1d09ada54 64 }
mbed_official 30:91c1d09ada54 65
mbed_official 30:91c1d09ada54 66 // Clear the interrupt...
mbed_official 30:91c1d09ada54 67 port_reg->IC = port_reg->MIS;
mbed_official 30:91c1d09ada54 68 }
mbed_official 30:91c1d09ada54 69
mbed_official 30:91c1d09ada54 70 void gpio_irq0(void) {handle_interrupt_in(0);}
mbed_official 30:91c1d09ada54 71 void gpio_irq1(void) {handle_interrupt_in(1);}
mbed_official 30:91c1d09ada54 72 void gpio_irq2(void) {handle_interrupt_in(2);}
mbed_official 30:91c1d09ada54 73 void gpio_irq3(void) {handle_interrupt_in(3);}
mbed_official 30:91c1d09ada54 74
mbed_official 30:91c1d09ada54 75 int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id) {
mbed_official 30:91c1d09ada54 76 int channel;
mbed_official 30:91c1d09ada54 77 uint32_t port_num;
mbed_official 30:91c1d09ada54 78
mbed_official 30:91c1d09ada54 79 if (pin == NC) return -1;
mbed_official 30:91c1d09ada54 80
mbed_official 30:91c1d09ada54 81 // Firstly, we'll put some data in *obj so we can keep track of stuff.
mbed_official 30:91c1d09ada54 82 obj->pin = pin;
mbed_official 30:91c1d09ada54 83
mbed_official 30:91c1d09ada54 84 // Set the handler to be the pointer at the top...
mbed_official 30:91c1d09ada54 85 irq_handler = handler;
mbed_official 30:91c1d09ada54 86
mbed_official 30:91c1d09ada54 87 // Which port are we using?
mbed_official 30:91c1d09ada54 88 port_num = ((pin & 0xF000) >> PORT_SHIFT);
mbed_official 30:91c1d09ada54 89
mbed_official 30:91c1d09ada54 90 switch (port_num) {
mbed_official 30:91c1d09ada54 91 case 0:
mbed_official 30:91c1d09ada54 92 NVIC_SetVector(EINT0_IRQn, (uint32_t)gpio_irq0);
mbed_official 30:91c1d09ada54 93 NVIC_EnableIRQ(EINT0_IRQn);
mbed_official 30:91c1d09ada54 94 break;
mbed_official 30:91c1d09ada54 95 case 1:
mbed_official 30:91c1d09ada54 96 NVIC_SetVector(EINT1_IRQn, (uint32_t)gpio_irq1);
mbed_official 30:91c1d09ada54 97 NVIC_EnableIRQ(EINT1_IRQn);
mbed_official 30:91c1d09ada54 98 break;
mbed_official 30:91c1d09ada54 99 case 2:
mbed_official 30:91c1d09ada54 100 NVIC_SetVector(EINT2_IRQn, (uint32_t)gpio_irq2);
mbed_official 30:91c1d09ada54 101 NVIC_EnableIRQ(EINT2_IRQn);
mbed_official 30:91c1d09ada54 102 break;
mbed_official 30:91c1d09ada54 103 case 3:
mbed_official 30:91c1d09ada54 104 NVIC_SetVector(EINT3_IRQn, (uint32_t)gpio_irq3);
mbed_official 30:91c1d09ada54 105 NVIC_EnableIRQ(EINT3_IRQn);
mbed_official 30:91c1d09ada54 106 break;
mbed_official 30:91c1d09ada54 107 default:
mbed_official 30:91c1d09ada54 108 return -1;
mbed_official 30:91c1d09ada54 109 }
mbed_official 30:91c1d09ada54 110
mbed_official 30:91c1d09ada54 111 // Generate index of function pointer table
mbed_official 30:91c1d09ada54 112 // PIO0_0 - PIO0_11 : 0..11
mbed_official 30:91c1d09ada54 113 // PIO1_0 - PIO1_11 : 12..23
mbed_official 30:91c1d09ada54 114 // PIO2_0 - PIO2_11 : 24..35
mbed_official 30:91c1d09ada54 115 // PIO3_0 - PIO3_5 : 36..41
mbed_official 30:91c1d09ada54 116 channel = (port_num * 12) + ((pin & 0x0F00) >> PIN_SHIFT);
mbed_official 30:91c1d09ada54 117
mbed_official 30:91c1d09ada54 118 channel_ids[channel] = id;
mbed_official 30:91c1d09ada54 119 obj->ch = channel;
mbed_official 30:91c1d09ada54 120
mbed_official 30:91c1d09ada54 121 return 0;
mbed_official 30:91c1d09ada54 122 }
mbed_official 30:91c1d09ada54 123
mbed_official 30:91c1d09ada54 124 void gpio_irq_free(gpio_irq_t *obj) {
mbed_official 30:91c1d09ada54 125 channel_ids[obj->ch] = 0;
mbed_official 30:91c1d09ada54 126 }
mbed_official 30:91c1d09ada54 127
mbed_official 30:91c1d09ada54 128 void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable) {
mbed_official 30:91c1d09ada54 129 // Firstly, check if there is an existing event stored...
mbed_official 30:91c1d09ada54 130
mbed_official 30:91c1d09ada54 131 LPC_GPIO_TypeDef *port_reg = ((LPC_GPIO_TypeDef *) (LPC_GPIO0_BASE + (((obj->pin & 0xF000) >> PORT_SHIFT) * 0x10000)));
mbed_official 30:91c1d09ada54 132
mbed_official 30:91c1d09ada54 133 // Need to get the pin number of the pin, not the value of the enum
mbed_official 30:91c1d09ada54 134 uint32_t pin_num = (1 << ((obj->pin & 0x0f00) >> PIN_SHIFT));
mbed_official 30:91c1d09ada54 135
mbed_official 30:91c1d09ada54 136 // Clear
mbed_official 30:91c1d09ada54 137 port_reg->IC |= pin_num;
mbed_official 30:91c1d09ada54 138
mbed_official 30:91c1d09ada54 139 // Make it edge sensitive.
mbed_official 30:91c1d09ada54 140 port_reg->IS &= ~pin_num;
mbed_official 30:91c1d09ada54 141
mbed_official 30:91c1d09ada54 142 if ( (port_reg->IE & pin_num) != 0) {
mbed_official 30:91c1d09ada54 143 // We have an event.
mbed_official 30:91c1d09ada54 144 // Enable both edge interrupts.
mbed_official 30:91c1d09ada54 145
mbed_official 30:91c1d09ada54 146 if (enable) {
mbed_official 30:91c1d09ada54 147 port_reg->IBE |= pin_num;
mbed_official 30:91c1d09ada54 148 port_reg->IE |= pin_num;
mbed_official 30:91c1d09ada54 149 }
mbed_official 30:91c1d09ada54 150 else {
mbed_official 30:91c1d09ada54 151 // These all need to be opposite, to reenable the other one.
mbed_official 30:91c1d09ada54 152 port_reg->IBE &= ~pin_num;
mbed_official 30:91c1d09ada54 153
mbed_official 30:91c1d09ada54 154 if (event == IRQ_RISE)
mbed_official 30:91c1d09ada54 155 port_reg->IEV &= ~pin_num;
mbed_official 30:91c1d09ada54 156 else
mbed_official 30:91c1d09ada54 157 port_reg->IEV |= pin_num;
mbed_official 30:91c1d09ada54 158
mbed_official 30:91c1d09ada54 159 port_reg->IE |= pin_num;
mbed_official 30:91c1d09ada54 160 }
mbed_official 30:91c1d09ada54 161 }
mbed_official 30:91c1d09ada54 162 else {
mbed_official 30:91c1d09ada54 163 // One edge
mbed_official 30:91c1d09ada54 164 port_reg->IBE &= ~pin_num;
mbed_official 30:91c1d09ada54 165 // Rising/falling?
mbed_official 30:91c1d09ada54 166 if (event == IRQ_RISE)
mbed_official 30:91c1d09ada54 167 port_reg->IEV |= pin_num;
mbed_official 30:91c1d09ada54 168 else
mbed_official 30:91c1d09ada54 169 port_reg->IEV &= ~pin_num;
mbed_official 30:91c1d09ada54 170
mbed_official 30:91c1d09ada54 171 if (enable) {
mbed_official 30:91c1d09ada54 172 port_reg->IE |= pin_num;
mbed_official 30:91c1d09ada54 173 }
mbed_official 30:91c1d09ada54 174 }
mbed_official 30:91c1d09ada54 175
mbed_official 30:91c1d09ada54 176 }
mbed_official 35:371630885ad6 177
mbed_official 35:371630885ad6 178 void gpio_irq_enable(gpio_irq_t *obj) {
mbed_official 35:371630885ad6 179 uint32_t port_num = ((obj->pin & 0xF000) >> PORT_SHIFT);
mbed_official 35:371630885ad6 180 switch (port_num) {
mbed_official 35:371630885ad6 181 case 0:
mbed_official 35:371630885ad6 182 NVIC_EnableIRQ(EINT0_IRQn);
mbed_official 35:371630885ad6 183 break;
mbed_official 35:371630885ad6 184 case 1:
mbed_official 35:371630885ad6 185 NVIC_EnableIRQ(EINT1_IRQn);
mbed_official 35:371630885ad6 186 break;
mbed_official 35:371630885ad6 187 case 2:
mbed_official 35:371630885ad6 188 NVIC_EnableIRQ(EINT2_IRQn);
mbed_official 35:371630885ad6 189 break;
mbed_official 35:371630885ad6 190 case 3:
mbed_official 35:371630885ad6 191 NVIC_EnableIRQ(EINT3_IRQn);
mbed_official 35:371630885ad6 192 break;
mbed_official 35:371630885ad6 193 default:
mbed_official 35:371630885ad6 194 break;
mbed_official 35:371630885ad6 195 }
mbed_official 35:371630885ad6 196 }
mbed_official 35:371630885ad6 197
mbed_official 35:371630885ad6 198 void gpio_irq_disable(gpio_irq_t *obj) {
mbed_official 35:371630885ad6 199 uint32_t port_num = ((obj->pin & 0xF000) >> PORT_SHIFT);
mbed_official 35:371630885ad6 200 switch (port_num) {
mbed_official 35:371630885ad6 201 case 0:
mbed_official 35:371630885ad6 202 NVIC_DisableIRQ(EINT0_IRQn);
mbed_official 35:371630885ad6 203 break;
mbed_official 35:371630885ad6 204 case 1:
mbed_official 35:371630885ad6 205 NVIC_DisableIRQ(EINT1_IRQn);
mbed_official 35:371630885ad6 206 break;
mbed_official 35:371630885ad6 207 case 2:
mbed_official 35:371630885ad6 208 NVIC_DisableIRQ(EINT2_IRQn);
mbed_official 35:371630885ad6 209 break;
mbed_official 35:371630885ad6 210 case 3:
mbed_official 35:371630885ad6 211 NVIC_DisableIRQ(EINT3_IRQn);
mbed_official 35:371630885ad6 212 break;
mbed_official 35:371630885ad6 213 default:
mbed_official 35:371630885ad6 214 break;
mbed_official 35:371630885ad6 215 }
mbed_official 35:371630885ad6 216 }