mbed library sources: Modified to operate FRDM-KL25Z at 48MHz from internal 32kHz oscillator (nothing else changed).
Fork of mbed-src by
The only file that changed is: mbed-src-FLL48/targets/cmsis/TARGET_Freescale/TARGET_KL25Z/system_MKL25Z4.h
targets/hal/TARGET_NXP/TARGET_LPC11XX/gpio_irq_api.c@19:398f4c622e1b, 2013-08-19 (annotated)
- Committer:
- bogdanm
- Date:
- Mon Aug 19 18:17:02 2013 +0300
- Revision:
- 19:398f4c622e1b
- Child:
- 20:4263a77256ae
Sync with official mbed library release 66
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
bogdanm | 19:398f4c622e1b | 1 | /* mbed Microcontroller Library |
bogdanm | 19:398f4c622e1b | 2 | * Copyright (c) 2006-2013 ARM Limited |
bogdanm | 19:398f4c622e1b | 3 | * |
bogdanm | 19:398f4c622e1b | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
bogdanm | 19:398f4c622e1b | 5 | * you may not use this file except in compliance with the License. |
bogdanm | 19:398f4c622e1b | 6 | * You may obtain a copy of the License at |
bogdanm | 19:398f4c622e1b | 7 | * |
bogdanm | 19:398f4c622e1b | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
bogdanm | 19:398f4c622e1b | 9 | * |
bogdanm | 19:398f4c622e1b | 10 | * Unless required by applicable law or agreed to in writing, software |
bogdanm | 19:398f4c622e1b | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
bogdanm | 19:398f4c622e1b | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
bogdanm | 19:398f4c622e1b | 13 | * See the License for the specific language governing permissions and |
bogdanm | 19:398f4c622e1b | 14 | * limitations under the License. |
bogdanm | 19:398f4c622e1b | 15 | */ |
bogdanm | 19:398f4c622e1b | 16 | #include <stddef.h> |
bogdanm | 19:398f4c622e1b | 17 | #include "cmsis.h" |
bogdanm | 19:398f4c622e1b | 18 | #include "gpio_irq_api.h" |
bogdanm | 19:398f4c622e1b | 19 | #include "error.h" |
bogdanm | 19:398f4c622e1b | 20 | #include "gpio_api.h" |
bogdanm | 19:398f4c622e1b | 21 | |
bogdanm | 19:398f4c622e1b | 22 | // The chip is capable of 4 external interrupts. |
bogdanm | 19:398f4c622e1b | 23 | #define CHANNEL_NUM 4 |
bogdanm | 19:398f4c622e1b | 24 | |
bogdanm | 19:398f4c622e1b | 25 | static uint32_t channel_ids[CHANNEL_NUM] = {0}; |
bogdanm | 19:398f4c622e1b | 26 | static gpio_irq_handler irq_handler; |
bogdanm | 19:398f4c622e1b | 27 | static PinName pin_names[CHANNEL_NUM] = {}; |
bogdanm | 19:398f4c622e1b | 28 | static uint8_t trigger_events[CHANNEL_NUM] = {}; |
bogdanm | 19:398f4c622e1b | 29 | |
bogdanm | 19:398f4c622e1b | 30 | static inline void handle_interrupt_in(uint32_t channel) { |
bogdanm | 19:398f4c622e1b | 31 | // Find out whether the interrupt has been triggered by a high or low value... |
bogdanm | 19:398f4c622e1b | 32 | // As the LPC1114 doesn't have a specific register for this, we'll just have to read |
bogdanm | 19:398f4c622e1b | 33 | // the level of the pin as if it were just a normal input... |
bogdanm | 19:398f4c622e1b | 34 | |
bogdanm | 19:398f4c622e1b | 35 | // Get the number of the pin being used and the port typedef |
bogdanm | 19:398f4c622e1b | 36 | LPC_GPIO_TypeDef *port_reg = ((LPC_GPIO_TypeDef *) (LPC_GPIO0_BASE + (((pin_names[channel] & 0xF000) >> PORT_SHIFT) * 0x10000))); |
bogdanm | 19:398f4c622e1b | 37 | uint8_t pin_num = (pin_names[channel] & (0x0f << PIN_SHIFT)) >> PIN_SHIFT; |
bogdanm | 19:398f4c622e1b | 38 | uint8_t trigger_event = trigger_events[channel]; |
bogdanm | 19:398f4c622e1b | 39 | |
bogdanm | 19:398f4c622e1b | 40 | if (trigger_event == 1) |
bogdanm | 19:398f4c622e1b | 41 | irq_handler(channel_ids[channel], IRQ_RISE); |
bogdanm | 19:398f4c622e1b | 42 | else if (trigger_event == 2) |
bogdanm | 19:398f4c622e1b | 43 | irq_handler(channel_ids[channel], IRQ_FALL); |
bogdanm | 19:398f4c622e1b | 44 | else { |
bogdanm | 19:398f4c622e1b | 45 | // In order to get an idea of which kind of event it is, |
bogdanm | 19:398f4c622e1b | 46 | // We need to read the logic level of the pin... |
bogdanm | 19:398f4c622e1b | 47 | |
bogdanm | 19:398f4c622e1b | 48 | uint8_t logic = (port_reg->DATA & (1 << pin_num)) >> pin_num; |
bogdanm | 19:398f4c622e1b | 49 | |
bogdanm | 19:398f4c622e1b | 50 | if (logic == 1) |
bogdanm | 19:398f4c622e1b | 51 | irq_handler(channel_ids[channel], IRQ_RISE); |
bogdanm | 19:398f4c622e1b | 52 | else |
bogdanm | 19:398f4c622e1b | 53 | irq_handler(channel_ids[channel], IRQ_FALL); |
bogdanm | 19:398f4c622e1b | 54 | } |
bogdanm | 19:398f4c622e1b | 55 | |
bogdanm | 19:398f4c622e1b | 56 | // Clear the interrupt... |
bogdanm | 19:398f4c622e1b | 57 | port_reg->IC |= 1 << pin_num; |
bogdanm | 19:398f4c622e1b | 58 | } |
bogdanm | 19:398f4c622e1b | 59 | |
bogdanm | 19:398f4c622e1b | 60 | void gpio_irq0(void) {handle_interrupt_in(0);} |
bogdanm | 19:398f4c622e1b | 61 | void gpio_irq1(void) {handle_interrupt_in(1);} |
bogdanm | 19:398f4c622e1b | 62 | void gpio_irq2(void) {handle_interrupt_in(2);} |
bogdanm | 19:398f4c622e1b | 63 | void gpio_irq3(void) {handle_interrupt_in(3);} |
bogdanm | 19:398f4c622e1b | 64 | |
bogdanm | 19:398f4c622e1b | 65 | int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id) { |
bogdanm | 19:398f4c622e1b | 66 | if (pin == NC) return -1; |
bogdanm | 19:398f4c622e1b | 67 | |
bogdanm | 19:398f4c622e1b | 68 | // Firstly, we'll put some data in *obj so we can keep track of stuff. |
bogdanm | 19:398f4c622e1b | 69 | obj->pin = pin; |
bogdanm | 19:398f4c622e1b | 70 | |
bogdanm | 19:398f4c622e1b | 71 | // Set the handler to be the pointer at the top... |
bogdanm | 19:398f4c622e1b | 72 | irq_handler = handler; |
bogdanm | 19:398f4c622e1b | 73 | |
bogdanm | 19:398f4c622e1b | 74 | // Which port are we using? |
bogdanm | 19:398f4c622e1b | 75 | int channel; |
bogdanm | 19:398f4c622e1b | 76 | uint32_t port_reg = (LPC_GPIO0_BASE + (((pin & 0xF000) >> PORT_SHIFT) * 0x10000)); |
bogdanm | 19:398f4c622e1b | 77 | |
bogdanm | 19:398f4c622e1b | 78 | switch (port_reg) { |
bogdanm | 19:398f4c622e1b | 79 | case LPC_GPIO0_BASE: |
bogdanm | 19:398f4c622e1b | 80 | NVIC_SetVector(EINT0_IRQn, (uint32_t)gpio_irq0); |
bogdanm | 19:398f4c622e1b | 81 | NVIC_EnableIRQ(EINT0_IRQn); |
bogdanm | 19:398f4c622e1b | 82 | channel = 0; |
bogdanm | 19:398f4c622e1b | 83 | break; |
bogdanm | 19:398f4c622e1b | 84 | case LPC_GPIO1_BASE: |
bogdanm | 19:398f4c622e1b | 85 | NVIC_SetVector(EINT1_IRQn, (uint32_t)gpio_irq1); |
bogdanm | 19:398f4c622e1b | 86 | NVIC_EnableIRQ(EINT1_IRQn); |
bogdanm | 19:398f4c622e1b | 87 | channel = 1; |
bogdanm | 19:398f4c622e1b | 88 | break; |
bogdanm | 19:398f4c622e1b | 89 | case LPC_GPIO2_BASE: |
bogdanm | 19:398f4c622e1b | 90 | NVIC_SetVector(EINT2_IRQn, (uint32_t)gpio_irq2); |
bogdanm | 19:398f4c622e1b | 91 | NVIC_EnableIRQ(EINT2_IRQn); |
bogdanm | 19:398f4c622e1b | 92 | channel = 2; |
bogdanm | 19:398f4c622e1b | 93 | break; |
bogdanm | 19:398f4c622e1b | 94 | case LPC_GPIO3_BASE: |
bogdanm | 19:398f4c622e1b | 95 | NVIC_SetVector(EINT3_IRQn, (uint32_t)gpio_irq3); |
bogdanm | 19:398f4c622e1b | 96 | NVIC_EnableIRQ(EINT3_IRQn); |
bogdanm | 19:398f4c622e1b | 97 | channel = 3; |
bogdanm | 19:398f4c622e1b | 98 | break; |
bogdanm | 19:398f4c622e1b | 99 | default: |
bogdanm | 19:398f4c622e1b | 100 | channel = -1; |
bogdanm | 19:398f4c622e1b | 101 | error("Invalid interrupt choice."); |
bogdanm | 19:398f4c622e1b | 102 | break; |
bogdanm | 19:398f4c622e1b | 103 | } |
bogdanm | 19:398f4c622e1b | 104 | |
bogdanm | 19:398f4c622e1b | 105 | channel_ids[channel] = id; |
bogdanm | 19:398f4c622e1b | 106 | pin_names[channel] = pin; |
bogdanm | 19:398f4c622e1b | 107 | obj->ch = channel; |
bogdanm | 19:398f4c622e1b | 108 | return 0; |
bogdanm | 19:398f4c622e1b | 109 | } |
bogdanm | 19:398f4c622e1b | 110 | |
bogdanm | 19:398f4c622e1b | 111 | void gpio_irq_free(gpio_irq_t *obj) { |
bogdanm | 19:398f4c622e1b | 112 | channel_ids[obj->ch] = 0; |
bogdanm | 19:398f4c622e1b | 113 | } |
bogdanm | 19:398f4c622e1b | 114 | |
bogdanm | 19:398f4c622e1b | 115 | void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable) { |
bogdanm | 19:398f4c622e1b | 116 | // Firstly, check if there is an existing event stored... |
bogdanm | 19:398f4c622e1b | 117 | |
bogdanm | 19:398f4c622e1b | 118 | LPC_GPIO_TypeDef *port_reg = ((LPC_GPIO_TypeDef *) (LPC_GPIO0_BASE + (((obj->pin & 0xF000) >> PORT_SHIFT) * 0x10000))); |
bogdanm | 19:398f4c622e1b | 119 | |
bogdanm | 19:398f4c622e1b | 120 | // Need to get the pin number of the pin, not the value of the enum |
bogdanm | 19:398f4c622e1b | 121 | uint8_t pin_num = (obj->pin & (0x0f << PIN_SHIFT)) >> PIN_SHIFT; |
bogdanm | 19:398f4c622e1b | 122 | |
bogdanm | 19:398f4c622e1b | 123 | |
bogdanm | 19:398f4c622e1b | 124 | if (trigger_events[obj->ch] != 0) { |
bogdanm | 19:398f4c622e1b | 125 | // We have an event. |
bogdanm | 19:398f4c622e1b | 126 | // Enable both edge interrupts. |
bogdanm | 19:398f4c622e1b | 127 | |
bogdanm | 19:398f4c622e1b | 128 | if (enable) { |
bogdanm | 19:398f4c622e1b | 129 | trigger_events[obj->ch] = 3; |
bogdanm | 19:398f4c622e1b | 130 | port_reg->IBE |= 1 << pin_num; |
bogdanm | 19:398f4c622e1b | 131 | port_reg->IE |= 1 << pin_num; |
bogdanm | 19:398f4c622e1b | 132 | } |
bogdanm | 19:398f4c622e1b | 133 | else { |
bogdanm | 19:398f4c622e1b | 134 | // These all need to be opposite, to reenable the other one. |
bogdanm | 19:398f4c622e1b | 135 | trigger_events[obj->ch] = event == IRQ_RISE ? 2 : 1; |
bogdanm | 19:398f4c622e1b | 136 | |
bogdanm | 19:398f4c622e1b | 137 | port_reg->IBE &= ~(1 << pin_num); |
bogdanm | 19:398f4c622e1b | 138 | |
bogdanm | 19:398f4c622e1b | 139 | if (event == IRQ_RISE) |
bogdanm | 19:398f4c622e1b | 140 | port_reg->IEV &= ~(1 << pin_num); |
bogdanm | 19:398f4c622e1b | 141 | else |
bogdanm | 19:398f4c622e1b | 142 | port_reg->IEV |= 1 << pin_num; |
bogdanm | 19:398f4c622e1b | 143 | |
bogdanm | 19:398f4c622e1b | 144 | port_reg->IE |= 1 << pin_num; |
bogdanm | 19:398f4c622e1b | 145 | } |
bogdanm | 19:398f4c622e1b | 146 | } |
bogdanm | 19:398f4c622e1b | 147 | else { |
bogdanm | 19:398f4c622e1b | 148 | if (enable) { |
bogdanm | 19:398f4c622e1b | 149 | trigger_events[obj->ch] = event == IRQ_RISE ? 1 : 2; |
bogdanm | 19:398f4c622e1b | 150 | port_reg->IE |= 1 << pin_num; |
bogdanm | 19:398f4c622e1b | 151 | } |
bogdanm | 19:398f4c622e1b | 152 | // One edge |
bogdanm | 19:398f4c622e1b | 153 | port_reg->IBE &= ~(1 << pin_num); |
bogdanm | 19:398f4c622e1b | 154 | // Rising/falling? |
bogdanm | 19:398f4c622e1b | 155 | if (event == IRQ_RISE) |
bogdanm | 19:398f4c622e1b | 156 | port_reg->IEV |= 1 << pin_num; |
bogdanm | 19:398f4c622e1b | 157 | else |
bogdanm | 19:398f4c622e1b | 158 | port_reg->IEV &= ~(1 << pin_num); |
bogdanm | 19:398f4c622e1b | 159 | } |
bogdanm | 19:398f4c622e1b | 160 | |
bogdanm | 19:398f4c622e1b | 161 | // Clear |
bogdanm | 19:398f4c622e1b | 162 | port_reg->IC |= 1 << pin_num; |
bogdanm | 19:398f4c622e1b | 163 | |
bogdanm | 19:398f4c622e1b | 164 | // Make it edge sensitive. |
bogdanm | 19:398f4c622e1b | 165 | port_reg->IS &= ~(1 << pin_num); |
bogdanm | 19:398f4c622e1b | 166 | } |