mbed library sources modified for open wear
Dependents: openwear-lifelogger-example
Fork of mbed-src by
targets/hal/TARGET_NXP/TARGET_LPC11XX_11CXX/gpio_irq_api.c@30:91c1d09ada54, 2013-09-25 (annotated)
- Committer:
- mbed_official
- Date:
- Wed Sep 25 10:30:04 2013 +0100
- Revision:
- 30:91c1d09ada54
- Child:
- 35:371630885ad6
Synchronized with git revision 8f57c1e84759991fa81ede0da2b4aabe8530fa09
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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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 | } |