Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_Atmel/TARGET_SAM_CortexM0P/gpio_irq_api.c@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
64:41a834223ea3 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 15:a81a8d6c1dfe 1 /* mbed Microcontroller Library
mbed_official 15:a81a8d6c1dfe 2 * Copyright (c) 2006-2015 ARM Limited
mbed_official 15:a81a8d6c1dfe 3 *
mbed_official 15:a81a8d6c1dfe 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 15:a81a8d6c1dfe 5 * you may not use this file except in compliance with the License.
mbed_official 15:a81a8d6c1dfe 6 * You may obtain a copy of the License at
mbed_official 15:a81a8d6c1dfe 7 *
mbed_official 15:a81a8d6c1dfe 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 15:a81a8d6c1dfe 9 *
mbed_official 15:a81a8d6c1dfe 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 15:a81a8d6c1dfe 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 15:a81a8d6c1dfe 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 15:a81a8d6c1dfe 13 * See the License for the specific language governing permissions and
mbed_official 15:a81a8d6c1dfe 14 * limitations under the License.
mbed_official 15:a81a8d6c1dfe 15 */
mbed_official 15:a81a8d6c1dfe 16 #include <stddef.h>
mbed_official 15:a81a8d6c1dfe 17 #include "cmsis.h"
mbed_official 15:a81a8d6c1dfe 18
mbed_official 15:a81a8d6c1dfe 19 #include "gpio_irq_api.h"
mbed_official 15:a81a8d6c1dfe 20 #include "gpio_api.h"
mbed_official 15:a81a8d6c1dfe 21 #include "mbed_error.h"
mbed_official 15:a81a8d6c1dfe 22 #include "extint.h"
mbed_official 15:a81a8d6c1dfe 23 #include "pinmap.h"
mbed_official 15:a81a8d6c1dfe 24 #include "PeripheralPins.h"
mbed_official 15:a81a8d6c1dfe 25 #include "port.h"
mbed_official 15:a81a8d6c1dfe 26
mbed_official 15:a81a8d6c1dfe 27 #define IRQ_RISE_POSITION 1
mbed_official 15:a81a8d6c1dfe 28 #define IRQ_FALL_POSITION 2
mbed_official 15:a81a8d6c1dfe 29 #define CHANNEL_NUM 16
mbed_official 15:a81a8d6c1dfe 30 #define pEXT_CONF(obj) (obj->config_extint_chan)
mbed_official 15:a81a8d6c1dfe 31 static uint32_t channel_ids[CHANNEL_NUM] = {0};
mbed_official 15:a81a8d6c1dfe 32 static gpio_irq_handler irq_handler;
mbed_official 15:a81a8d6c1dfe 33 uint8_t ext_int_pins[EIC_NUMBER_OF_INTERRUPTS] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
mbed_official 15:a81a8d6c1dfe 34
mbed_official 15:a81a8d6c1dfe 35 void gpio_irq(void)
mbed_official 15:a81a8d6c1dfe 36 {
mbed_official 15:a81a8d6c1dfe 37 uint32_t current_channel;
mbed_official 15:a81a8d6c1dfe 38 uint32_t mask;
mbed_official 15:a81a8d6c1dfe 39 gpio_irq_event event;
mbed_official 15:a81a8d6c1dfe 40 PortGroup *port_base;
mbed_official 15:a81a8d6c1dfe 41
mbed_official 15:a81a8d6c1dfe 42 for (current_channel = 0; current_channel < EIC_NUMBER_OF_INTERRUPTS ; current_channel++) {
mbed_official 15:a81a8d6c1dfe 43 if (extint_chan_is_detected(current_channel)) {
mbed_official 15:a81a8d6c1dfe 44 extint_chan_clear_detected(current_channel);
mbed_official 15:a81a8d6c1dfe 45 port_base = (PortGroup*)port_get_group_from_gpio_pin(ext_int_pins[current_channel]);
mbed_official 64:41a834223ea3 46 mask = gpio_set((PinName)ext_int_pins[current_channel]);
mbed_official 15:a81a8d6c1dfe 47 if ((port_base->IN.reg & mask) != 0) {
mbed_official 15:a81a8d6c1dfe 48 event = IRQ_RISE;
mbed_official 15:a81a8d6c1dfe 49 } else {
mbed_official 15:a81a8d6c1dfe 50 event = IRQ_FALL;
mbed_official 15:a81a8d6c1dfe 51 }
mbed_official 15:a81a8d6c1dfe 52 if(irq_handler) {
mbed_official 15:a81a8d6c1dfe 53 irq_handler(channel_ids[current_channel], event);
mbed_official 15:a81a8d6c1dfe 54 }
mbed_official 15:a81a8d6c1dfe 55 }
mbed_official 15:a81a8d6c1dfe 56 }
mbed_official 15:a81a8d6c1dfe 57 }
mbed_official 15:a81a8d6c1dfe 58
mbed_official 15:a81a8d6c1dfe 59 int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id)
mbed_official 15:a81a8d6c1dfe 60 {
mbed_official 15:a81a8d6c1dfe 61 MBED_ASSERT(obj);
mbed_official 15:a81a8d6c1dfe 62 if (pin == NC)
mbed_official 15:a81a8d6c1dfe 63 return -1;
mbed_official 15:a81a8d6c1dfe 64
mbed_official 15:a81a8d6c1dfe 65 IRQn_Type irq_n = (IRQn_Type)0;
mbed_official 15:a81a8d6c1dfe 66 uint32_t vector = 0;
mbed_official 15:a81a8d6c1dfe 67 int int_channel = 0;
mbed_official 15:a81a8d6c1dfe 68 irq_handler = handler; // assuming the usage of these apis in mbed layer only
mbed_official 15:a81a8d6c1dfe 69
mbed_official 15:a81a8d6c1dfe 70 obj->pin = pin;
mbed_official 15:a81a8d6c1dfe 71
mbed_official 15:a81a8d6c1dfe 72 extint_chan_get_config_defaults(&pEXT_CONF(obj));
mbed_official 15:a81a8d6c1dfe 73 pEXT_CONF(obj).gpio_pin = (uint32_t)pin;
mbed_official 15:a81a8d6c1dfe 74 pEXT_CONF(obj).gpio_pin_mux = 0; // mux setting for ext int is 0
mbed_official 15:a81a8d6c1dfe 75 pEXT_CONF(obj).gpio_pin_pull = EXTINT_PULL_UP;
mbed_official 15:a81a8d6c1dfe 76 pEXT_CONF(obj).detection_criteria = EXTINT_DETECT_NONE;
mbed_official 15:a81a8d6c1dfe 77
mbed_official 15:a81a8d6c1dfe 78 int_channel = pinmap_find_peripheral(pin, PinMap_EXTINT);
mbed_official 15:a81a8d6c1dfe 79 if (int_channel == NC) {
mbed_official 15:a81a8d6c1dfe 80 return -1;
mbed_official 15:a81a8d6c1dfe 81 }
mbed_official 15:a81a8d6c1dfe 82 extint_chan_set_config(int_channel, &pEXT_CONF(obj));
mbed_official 15:a81a8d6c1dfe 83 ext_int_pins[int_channel] = pin;
mbed_official 15:a81a8d6c1dfe 84
mbed_official 15:a81a8d6c1dfe 85 irq_n = EIC_IRQn;
mbed_official 15:a81a8d6c1dfe 86 vector = (uint32_t)gpio_irq;
mbed_official 15:a81a8d6c1dfe 87 NVIC_SetVector(irq_n, vector);
mbed_official 15:a81a8d6c1dfe 88 NVIC_EnableIRQ(irq_n);
mbed_official 15:a81a8d6c1dfe 89 obj->ch = int_channel;
mbed_official 15:a81a8d6c1dfe 90 channel_ids[int_channel] = id;
mbed_official 15:a81a8d6c1dfe 91 obj->irqmask = 0;
mbed_official 15:a81a8d6c1dfe 92
mbed_official 15:a81a8d6c1dfe 93 return 0;
mbed_official 15:a81a8d6c1dfe 94 }
mbed_official 15:a81a8d6c1dfe 95
mbed_official 15:a81a8d6c1dfe 96 void gpio_irq_free(gpio_irq_t *obj)
mbed_official 15:a81a8d6c1dfe 97 {
mbed_official 15:a81a8d6c1dfe 98 MBED_ASSERT(obj);
mbed_official 15:a81a8d6c1dfe 99 Eic *const eic = _extint_get_eic_from_channel(obj->ch);
mbed_official 15:a81a8d6c1dfe 100 channel_ids[obj->ch] = 0;
mbed_official 15:a81a8d6c1dfe 101 eic->INTENCLR.reg = (1UL << obj->ch);
mbed_official 15:a81a8d6c1dfe 102 }
mbed_official 15:a81a8d6c1dfe 103
mbed_official 15:a81a8d6c1dfe 104 void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable)
mbed_official 15:a81a8d6c1dfe 105 {
mbed_official 15:a81a8d6c1dfe 106 MBED_ASSERT(obj);
mbed_official 15:a81a8d6c1dfe 107 Eic *const eic = _extint_get_eic_from_channel(obj->ch);
mbed_official 15:a81a8d6c1dfe 108 if (enable) {
mbed_official 15:a81a8d6c1dfe 109 if (event == IRQ_RISE) {
mbed_official 15:a81a8d6c1dfe 110 obj->irqmask |= IRQ_RISE_POSITION;
mbed_official 15:a81a8d6c1dfe 111 } else if (event == IRQ_FALL) {
mbed_official 15:a81a8d6c1dfe 112 obj->irqmask |= IRQ_FALL_POSITION;
mbed_official 15:a81a8d6c1dfe 113 }
mbed_official 15:a81a8d6c1dfe 114 eic->INTENSET.reg = (1UL << obj->ch);
mbed_official 15:a81a8d6c1dfe 115 } else {
mbed_official 15:a81a8d6c1dfe 116 if (event == IRQ_RISE) {
mbed_official 15:a81a8d6c1dfe 117 obj->irqmask &= ~IRQ_RISE_POSITION;
mbed_official 15:a81a8d6c1dfe 118 } else if (event == IRQ_FALL) {
mbed_official 15:a81a8d6c1dfe 119 obj->irqmask &= ~IRQ_FALL_POSITION;
mbed_official 15:a81a8d6c1dfe 120 }
mbed_official 15:a81a8d6c1dfe 121 }
mbed_official 15:a81a8d6c1dfe 122
mbed_official 15:a81a8d6c1dfe 123 if (obj->irqmask == (IRQ_RISE_POSITION | IRQ_FALL_POSITION)) {
mbed_official 15:a81a8d6c1dfe 124 pEXT_CONF(obj).detection_criteria = EXTINT_DETECT_BOTH;
mbed_official 15:a81a8d6c1dfe 125 } else if (obj->irqmask == IRQ_RISE_POSITION) {
mbed_official 15:a81a8d6c1dfe 126 pEXT_CONF(obj).detection_criteria = EXTINT_DETECT_RISING;
mbed_official 15:a81a8d6c1dfe 127 } else if (obj->irqmask == IRQ_FALL_POSITION) {
mbed_official 15:a81a8d6c1dfe 128 pEXT_CONF(obj).detection_criteria = EXTINT_DETECT_FALLING;
mbed_official 15:a81a8d6c1dfe 129 } else {
mbed_official 15:a81a8d6c1dfe 130 pEXT_CONF(obj).detection_criteria = EXTINT_DETECT_NONE;
mbed_official 15:a81a8d6c1dfe 131 eic->INTENCLR.reg = (1UL << obj->ch);
mbed_official 15:a81a8d6c1dfe 132 }
mbed_official 15:a81a8d6c1dfe 133
mbed_official 15:a81a8d6c1dfe 134 extint_chan_set_config(obj->ch, &pEXT_CONF(obj));
mbed_official 15:a81a8d6c1dfe 135 }
mbed_official 15:a81a8d6c1dfe 136
mbed_official 15:a81a8d6c1dfe 137 void gpio_irq_enable(gpio_irq_t *obj)
mbed_official 15:a81a8d6c1dfe 138 {
mbed_official 15:a81a8d6c1dfe 139 MBED_ASSERT(obj);
mbed_official 15:a81a8d6c1dfe 140 Eic *const eic = _extint_get_eic_from_channel(obj->ch);
mbed_official 15:a81a8d6c1dfe 141 NVIC_EnableIRQ(EIC_IRQn);
mbed_official 15:a81a8d6c1dfe 142 eic->INTENSET.reg = (1UL << obj->ch);
mbed_official 15:a81a8d6c1dfe 143 }
mbed_official 15:a81a8d6c1dfe 144
mbed_official 15:a81a8d6c1dfe 145 void gpio_irq_disable(gpio_irq_t *obj)
mbed_official 15:a81a8d6c1dfe 146 {
mbed_official 15:a81a8d6c1dfe 147 MBED_ASSERT(obj);
mbed_official 15:a81a8d6c1dfe 148 Eic *const eic = _extint_get_eic_from_channel(obj->ch);
mbed_official 15:a81a8d6c1dfe 149 eic->INTENCLR.reg = (1UL << obj->ch);
mbed_official 15:a81a8d6c1dfe 150 if (eic->INTENSET.reg == 0) {
mbed_official 15:a81a8d6c1dfe 151 NVIC_DisableIRQ(EIC_IRQn);
mbed_official 15:a81a8d6c1dfe 152 }
mbed_official 15:a81a8d6c1dfe 153 }