Mouse code for the MacroRat
mbed-dev/targets/TARGET_NXP/TARGET_LPC11XX_11CXX/gpio_irq_api.c@18:6a4db94011d3, 2017-05-14 (annotated)
- Committer:
- sahilmgandhi
- Date:
- Sun May 14 23:18:57 2017 +0000
- Revision:
- 18:6a4db94011d3
Publishing again
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
sahilmgandhi | 18:6a4db94011d3 | 1 | /* mbed Microcontroller Library |
sahilmgandhi | 18:6a4db94011d3 | 2 | * Copyright (c) 2006-2013 ARM Limited |
sahilmgandhi | 18:6a4db94011d3 | 3 | * |
sahilmgandhi | 18:6a4db94011d3 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
sahilmgandhi | 18:6a4db94011d3 | 5 | * you may not use this file except in compliance with the License. |
sahilmgandhi | 18:6a4db94011d3 | 6 | * You may obtain a copy of the License at |
sahilmgandhi | 18:6a4db94011d3 | 7 | * |
sahilmgandhi | 18:6a4db94011d3 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
sahilmgandhi | 18:6a4db94011d3 | 9 | * |
sahilmgandhi | 18:6a4db94011d3 | 10 | * Unless required by applicable law or agreed to in writing, software |
sahilmgandhi | 18:6a4db94011d3 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
sahilmgandhi | 18:6a4db94011d3 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
sahilmgandhi | 18:6a4db94011d3 | 13 | * See the License for the specific language governing permissions and |
sahilmgandhi | 18:6a4db94011d3 | 14 | * limitations under the License. |
sahilmgandhi | 18:6a4db94011d3 | 15 | */ |
sahilmgandhi | 18:6a4db94011d3 | 16 | #include <stddef.h> |
sahilmgandhi | 18:6a4db94011d3 | 17 | #include "cmsis.h" |
sahilmgandhi | 18:6a4db94011d3 | 18 | #include "gpio_irq_api.h" |
sahilmgandhi | 18:6a4db94011d3 | 19 | #include "mbed_error.h" |
sahilmgandhi | 18:6a4db94011d3 | 20 | #include "gpio_api.h" |
sahilmgandhi | 18:6a4db94011d3 | 21 | |
sahilmgandhi | 18:6a4db94011d3 | 22 | // The chip is capable of 42 GPIO interrupts. |
sahilmgandhi | 18:6a4db94011d3 | 23 | // PIO0_0..PIO0_11, PIO1_0..PIO1_11, PIO2_0..PIO2_11, PIO3_0..PIO3_5 |
sahilmgandhi | 18:6a4db94011d3 | 24 | #define CHANNEL_NUM 42 |
sahilmgandhi | 18:6a4db94011d3 | 25 | |
sahilmgandhi | 18:6a4db94011d3 | 26 | static uint32_t channel_ids[CHANNEL_NUM] = {0}; |
sahilmgandhi | 18:6a4db94011d3 | 27 | static gpio_irq_handler irq_handler; |
sahilmgandhi | 18:6a4db94011d3 | 28 | |
sahilmgandhi | 18:6a4db94011d3 | 29 | static inline int numofbits(uint32_t bits) |
sahilmgandhi | 18:6a4db94011d3 | 30 | { |
sahilmgandhi | 18:6a4db94011d3 | 31 | // Count number of bits |
sahilmgandhi | 18:6a4db94011d3 | 32 | bits = (bits & 0x55555555) + (bits >> 1 & 0x55555555); |
sahilmgandhi | 18:6a4db94011d3 | 33 | bits = (bits & 0x33333333) + (bits >> 2 & 0x33333333); |
sahilmgandhi | 18:6a4db94011d3 | 34 | bits = (bits & 0x0f0f0f0f) + (bits >> 4 & 0x0f0f0f0f); |
sahilmgandhi | 18:6a4db94011d3 | 35 | bits = (bits & 0x00ff00ff) + (bits >> 8 & 0x00ff00ff); |
sahilmgandhi | 18:6a4db94011d3 | 36 | return (bits & 0x0000ffff) + (bits >>16 & 0x0000ffff); |
sahilmgandhi | 18:6a4db94011d3 | 37 | } |
sahilmgandhi | 18:6a4db94011d3 | 38 | |
sahilmgandhi | 18:6a4db94011d3 | 39 | static inline void handle_interrupt_in(uint32_t port) { |
sahilmgandhi | 18:6a4db94011d3 | 40 | // Find out whether the interrupt has been triggered by a high or low value... |
sahilmgandhi | 18:6a4db94011d3 | 41 | // As the LPC1114 doesn't have a specific register for this, we'll just have to read |
sahilmgandhi | 18:6a4db94011d3 | 42 | // the level of the pin as if it were just a normal input... |
sahilmgandhi | 18:6a4db94011d3 | 43 | |
sahilmgandhi | 18:6a4db94011d3 | 44 | uint32_t channel; |
sahilmgandhi | 18:6a4db94011d3 | 45 | |
sahilmgandhi | 18:6a4db94011d3 | 46 | // Get the number of the pin being used and the port typedef |
sahilmgandhi | 18:6a4db94011d3 | 47 | LPC_GPIO_TypeDef *port_reg = ((LPC_GPIO_TypeDef *) (LPC_GPIO0_BASE + (port * 0x10000))); |
sahilmgandhi | 18:6a4db94011d3 | 48 | |
sahilmgandhi | 18:6a4db94011d3 | 49 | // Get index of function table from Mask Interrupt Status register |
sahilmgandhi | 18:6a4db94011d3 | 50 | channel = numofbits(port_reg->MIS - 1) + (port * 12); |
sahilmgandhi | 18:6a4db94011d3 | 51 | |
sahilmgandhi | 18:6a4db94011d3 | 52 | if (port_reg->MIS & port_reg->IBE) { |
sahilmgandhi | 18:6a4db94011d3 | 53 | // both edge, read the level of pin |
sahilmgandhi | 18:6a4db94011d3 | 54 | if ((port_reg->DATA & port_reg->MIS) != 0) |
sahilmgandhi | 18:6a4db94011d3 | 55 | irq_handler(channel_ids[channel], IRQ_RISE); |
sahilmgandhi | 18:6a4db94011d3 | 56 | else |
sahilmgandhi | 18:6a4db94011d3 | 57 | irq_handler(channel_ids[channel], IRQ_FALL); |
sahilmgandhi | 18:6a4db94011d3 | 58 | } |
sahilmgandhi | 18:6a4db94011d3 | 59 | else if (port_reg->MIS & port_reg->IEV) { |
sahilmgandhi | 18:6a4db94011d3 | 60 | irq_handler(channel_ids[channel], IRQ_RISE); |
sahilmgandhi | 18:6a4db94011d3 | 61 | } |
sahilmgandhi | 18:6a4db94011d3 | 62 | else { |
sahilmgandhi | 18:6a4db94011d3 | 63 | irq_handler(channel_ids[channel], IRQ_FALL); |
sahilmgandhi | 18:6a4db94011d3 | 64 | } |
sahilmgandhi | 18:6a4db94011d3 | 65 | |
sahilmgandhi | 18:6a4db94011d3 | 66 | // Clear the interrupt... |
sahilmgandhi | 18:6a4db94011d3 | 67 | port_reg->IC = port_reg->MIS; |
sahilmgandhi | 18:6a4db94011d3 | 68 | } |
sahilmgandhi | 18:6a4db94011d3 | 69 | |
sahilmgandhi | 18:6a4db94011d3 | 70 | void gpio_irq0(void) {handle_interrupt_in(0);} |
sahilmgandhi | 18:6a4db94011d3 | 71 | void gpio_irq1(void) {handle_interrupt_in(1);} |
sahilmgandhi | 18:6a4db94011d3 | 72 | void gpio_irq2(void) {handle_interrupt_in(2);} |
sahilmgandhi | 18:6a4db94011d3 | 73 | void gpio_irq3(void) {handle_interrupt_in(3);} |
sahilmgandhi | 18:6a4db94011d3 | 74 | |
sahilmgandhi | 18:6a4db94011d3 | 75 | int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id) { |
sahilmgandhi | 18:6a4db94011d3 | 76 | int channel; |
sahilmgandhi | 18:6a4db94011d3 | 77 | uint32_t port_num; |
sahilmgandhi | 18:6a4db94011d3 | 78 | |
sahilmgandhi | 18:6a4db94011d3 | 79 | if (pin == NC) return -1; |
sahilmgandhi | 18:6a4db94011d3 | 80 | |
sahilmgandhi | 18:6a4db94011d3 | 81 | // Firstly, we'll put some data in *obj so we can keep track of stuff. |
sahilmgandhi | 18:6a4db94011d3 | 82 | obj->pin = pin; |
sahilmgandhi | 18:6a4db94011d3 | 83 | |
sahilmgandhi | 18:6a4db94011d3 | 84 | // Set the handler to be the pointer at the top... |
sahilmgandhi | 18:6a4db94011d3 | 85 | irq_handler = handler; |
sahilmgandhi | 18:6a4db94011d3 | 86 | |
sahilmgandhi | 18:6a4db94011d3 | 87 | // Which port are we using? |
sahilmgandhi | 18:6a4db94011d3 | 88 | port_num = ((pin & 0xF000) >> PORT_SHIFT); |
sahilmgandhi | 18:6a4db94011d3 | 89 | |
sahilmgandhi | 18:6a4db94011d3 | 90 | switch (port_num) { |
sahilmgandhi | 18:6a4db94011d3 | 91 | case 0: |
sahilmgandhi | 18:6a4db94011d3 | 92 | NVIC_SetVector(EINT0_IRQn, (uint32_t)gpio_irq0); |
sahilmgandhi | 18:6a4db94011d3 | 93 | NVIC_EnableIRQ(EINT0_IRQn); |
sahilmgandhi | 18:6a4db94011d3 | 94 | break; |
sahilmgandhi | 18:6a4db94011d3 | 95 | case 1: |
sahilmgandhi | 18:6a4db94011d3 | 96 | NVIC_SetVector(EINT1_IRQn, (uint32_t)gpio_irq1); |
sahilmgandhi | 18:6a4db94011d3 | 97 | NVIC_EnableIRQ(EINT1_IRQn); |
sahilmgandhi | 18:6a4db94011d3 | 98 | break; |
sahilmgandhi | 18:6a4db94011d3 | 99 | case 2: |
sahilmgandhi | 18:6a4db94011d3 | 100 | NVIC_SetVector(EINT2_IRQn, (uint32_t)gpio_irq2); |
sahilmgandhi | 18:6a4db94011d3 | 101 | NVIC_EnableIRQ(EINT2_IRQn); |
sahilmgandhi | 18:6a4db94011d3 | 102 | break; |
sahilmgandhi | 18:6a4db94011d3 | 103 | case 3: |
sahilmgandhi | 18:6a4db94011d3 | 104 | NVIC_SetVector(EINT3_IRQn, (uint32_t)gpio_irq3); |
sahilmgandhi | 18:6a4db94011d3 | 105 | NVIC_EnableIRQ(EINT3_IRQn); |
sahilmgandhi | 18:6a4db94011d3 | 106 | break; |
sahilmgandhi | 18:6a4db94011d3 | 107 | default: |
sahilmgandhi | 18:6a4db94011d3 | 108 | return -1; |
sahilmgandhi | 18:6a4db94011d3 | 109 | } |
sahilmgandhi | 18:6a4db94011d3 | 110 | |
sahilmgandhi | 18:6a4db94011d3 | 111 | // Generate index of function pointer table |
sahilmgandhi | 18:6a4db94011d3 | 112 | // PIO0_0 - PIO0_11 : 0..11 |
sahilmgandhi | 18:6a4db94011d3 | 113 | // PIO1_0 - PIO1_11 : 12..23 |
sahilmgandhi | 18:6a4db94011d3 | 114 | // PIO2_0 - PIO2_11 : 24..35 |
sahilmgandhi | 18:6a4db94011d3 | 115 | // PIO3_0 - PIO3_5 : 36..41 |
sahilmgandhi | 18:6a4db94011d3 | 116 | channel = (port_num * 12) + ((pin & 0x0F00) >> PIN_SHIFT); |
sahilmgandhi | 18:6a4db94011d3 | 117 | |
sahilmgandhi | 18:6a4db94011d3 | 118 | channel_ids[channel] = id; |
sahilmgandhi | 18:6a4db94011d3 | 119 | obj->ch = channel; |
sahilmgandhi | 18:6a4db94011d3 | 120 | |
sahilmgandhi | 18:6a4db94011d3 | 121 | return 0; |
sahilmgandhi | 18:6a4db94011d3 | 122 | } |
sahilmgandhi | 18:6a4db94011d3 | 123 | |
sahilmgandhi | 18:6a4db94011d3 | 124 | void gpio_irq_free(gpio_irq_t *obj) { |
sahilmgandhi | 18:6a4db94011d3 | 125 | channel_ids[obj->ch] = 0; |
sahilmgandhi | 18:6a4db94011d3 | 126 | } |
sahilmgandhi | 18:6a4db94011d3 | 127 | |
sahilmgandhi | 18:6a4db94011d3 | 128 | void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable) { |
sahilmgandhi | 18:6a4db94011d3 | 129 | // Firstly, check if there is an existing event stored... |
sahilmgandhi | 18:6a4db94011d3 | 130 | |
sahilmgandhi | 18:6a4db94011d3 | 131 | LPC_GPIO_TypeDef *port_reg = ((LPC_GPIO_TypeDef *) (LPC_GPIO0_BASE + (((obj->pin & 0xF000) >> PORT_SHIFT) * 0x10000))); |
sahilmgandhi | 18:6a4db94011d3 | 132 | |
sahilmgandhi | 18:6a4db94011d3 | 133 | // Need to get the pin number of the pin, not the value of the enum |
sahilmgandhi | 18:6a4db94011d3 | 134 | uint32_t pin_num = (1 << ((obj->pin & 0x0f00) >> PIN_SHIFT)); |
sahilmgandhi | 18:6a4db94011d3 | 135 | |
sahilmgandhi | 18:6a4db94011d3 | 136 | // Clear |
sahilmgandhi | 18:6a4db94011d3 | 137 | port_reg->IC |= pin_num; |
sahilmgandhi | 18:6a4db94011d3 | 138 | |
sahilmgandhi | 18:6a4db94011d3 | 139 | // Make it edge sensitive. |
sahilmgandhi | 18:6a4db94011d3 | 140 | port_reg->IS &= ~pin_num; |
sahilmgandhi | 18:6a4db94011d3 | 141 | |
sahilmgandhi | 18:6a4db94011d3 | 142 | if ( (port_reg->IE & pin_num) != 0) { |
sahilmgandhi | 18:6a4db94011d3 | 143 | // We have an event. |
sahilmgandhi | 18:6a4db94011d3 | 144 | // Enable both edge interrupts. |
sahilmgandhi | 18:6a4db94011d3 | 145 | |
sahilmgandhi | 18:6a4db94011d3 | 146 | if (enable) { |
sahilmgandhi | 18:6a4db94011d3 | 147 | port_reg->IBE |= pin_num; |
sahilmgandhi | 18:6a4db94011d3 | 148 | port_reg->IE |= pin_num; |
sahilmgandhi | 18:6a4db94011d3 | 149 | } |
sahilmgandhi | 18:6a4db94011d3 | 150 | else { |
sahilmgandhi | 18:6a4db94011d3 | 151 | // These all need to be opposite, to reenable the other one. |
sahilmgandhi | 18:6a4db94011d3 | 152 | port_reg->IBE &= ~pin_num; |
sahilmgandhi | 18:6a4db94011d3 | 153 | |
sahilmgandhi | 18:6a4db94011d3 | 154 | if (event == IRQ_RISE) |
sahilmgandhi | 18:6a4db94011d3 | 155 | port_reg->IEV &= ~pin_num; |
sahilmgandhi | 18:6a4db94011d3 | 156 | else |
sahilmgandhi | 18:6a4db94011d3 | 157 | port_reg->IEV |= pin_num; |
sahilmgandhi | 18:6a4db94011d3 | 158 | |
sahilmgandhi | 18:6a4db94011d3 | 159 | port_reg->IE |= pin_num; |
sahilmgandhi | 18:6a4db94011d3 | 160 | } |
sahilmgandhi | 18:6a4db94011d3 | 161 | } |
sahilmgandhi | 18:6a4db94011d3 | 162 | else { |
sahilmgandhi | 18:6a4db94011d3 | 163 | // One edge |
sahilmgandhi | 18:6a4db94011d3 | 164 | port_reg->IBE &= ~pin_num; |
sahilmgandhi | 18:6a4db94011d3 | 165 | // Rising/falling? |
sahilmgandhi | 18:6a4db94011d3 | 166 | if (event == IRQ_RISE) |
sahilmgandhi | 18:6a4db94011d3 | 167 | port_reg->IEV |= pin_num; |
sahilmgandhi | 18:6a4db94011d3 | 168 | else |
sahilmgandhi | 18:6a4db94011d3 | 169 | port_reg->IEV &= ~pin_num; |
sahilmgandhi | 18:6a4db94011d3 | 170 | |
sahilmgandhi | 18:6a4db94011d3 | 171 | if (enable) { |
sahilmgandhi | 18:6a4db94011d3 | 172 | port_reg->IE |= pin_num; |
sahilmgandhi | 18:6a4db94011d3 | 173 | } |
sahilmgandhi | 18:6a4db94011d3 | 174 | } |
sahilmgandhi | 18:6a4db94011d3 | 175 | |
sahilmgandhi | 18:6a4db94011d3 | 176 | } |
sahilmgandhi | 18:6a4db94011d3 | 177 | |
sahilmgandhi | 18:6a4db94011d3 | 178 | void gpio_irq_enable(gpio_irq_t *obj) { |
sahilmgandhi | 18:6a4db94011d3 | 179 | uint32_t port_num = ((obj->pin & 0xF000) >> PORT_SHIFT); |
sahilmgandhi | 18:6a4db94011d3 | 180 | switch (port_num) { |
sahilmgandhi | 18:6a4db94011d3 | 181 | case 0: |
sahilmgandhi | 18:6a4db94011d3 | 182 | NVIC_EnableIRQ(EINT0_IRQn); |
sahilmgandhi | 18:6a4db94011d3 | 183 | break; |
sahilmgandhi | 18:6a4db94011d3 | 184 | case 1: |
sahilmgandhi | 18:6a4db94011d3 | 185 | NVIC_EnableIRQ(EINT1_IRQn); |
sahilmgandhi | 18:6a4db94011d3 | 186 | break; |
sahilmgandhi | 18:6a4db94011d3 | 187 | case 2: |
sahilmgandhi | 18:6a4db94011d3 | 188 | NVIC_EnableIRQ(EINT2_IRQn); |
sahilmgandhi | 18:6a4db94011d3 | 189 | break; |
sahilmgandhi | 18:6a4db94011d3 | 190 | case 3: |
sahilmgandhi | 18:6a4db94011d3 | 191 | NVIC_EnableIRQ(EINT3_IRQn); |
sahilmgandhi | 18:6a4db94011d3 | 192 | break; |
sahilmgandhi | 18:6a4db94011d3 | 193 | default: |
sahilmgandhi | 18:6a4db94011d3 | 194 | break; |
sahilmgandhi | 18:6a4db94011d3 | 195 | } |
sahilmgandhi | 18:6a4db94011d3 | 196 | } |
sahilmgandhi | 18:6a4db94011d3 | 197 | |
sahilmgandhi | 18:6a4db94011d3 | 198 | void gpio_irq_disable(gpio_irq_t *obj) { |
sahilmgandhi | 18:6a4db94011d3 | 199 | uint32_t port_num = ((obj->pin & 0xF000) >> PORT_SHIFT); |
sahilmgandhi | 18:6a4db94011d3 | 200 | switch (port_num) { |
sahilmgandhi | 18:6a4db94011d3 | 201 | case 0: |
sahilmgandhi | 18:6a4db94011d3 | 202 | NVIC_DisableIRQ(EINT0_IRQn); |
sahilmgandhi | 18:6a4db94011d3 | 203 | break; |
sahilmgandhi | 18:6a4db94011d3 | 204 | case 1: |
sahilmgandhi | 18:6a4db94011d3 | 205 | NVIC_DisableIRQ(EINT1_IRQn); |
sahilmgandhi | 18:6a4db94011d3 | 206 | break; |
sahilmgandhi | 18:6a4db94011d3 | 207 | case 2: |
sahilmgandhi | 18:6a4db94011d3 | 208 | NVIC_DisableIRQ(EINT2_IRQn); |
sahilmgandhi | 18:6a4db94011d3 | 209 | break; |
sahilmgandhi | 18:6a4db94011d3 | 210 | case 3: |
sahilmgandhi | 18:6a4db94011d3 | 211 | NVIC_DisableIRQ(EINT3_IRQn); |
sahilmgandhi | 18:6a4db94011d3 | 212 | break; |
sahilmgandhi | 18:6a4db94011d3 | 213 | default: |
sahilmgandhi | 18:6a4db94011d3 | 214 | break; |
sahilmgandhi | 18:6a4db94011d3 | 215 | } |
sahilmgandhi | 18:6a4db94011d3 | 216 | } |