1 /* mbed Microcontroller Library
2 * Copyright (c) 2006-2013 ARM Limited
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include "gpio_irq_api.h"
20 #include "mbed_error.h"
22 #if DEVICE_INTERRUPTIN
25 #define LPC_GPIO_X LPC_PINT
26 #define PININT_IRQ PIN_INT0_IRQn
28 static uint32_t channel_ids
[CHANNEL_NUM
] = {0};
29 static gpio_irq_handler irq_handler
;
31 static inline void handle_interrupt_in(uint32_t channel
) {
32 uint32_t ch_bit
= (1 << channel
);
33 // Return immediately if:
34 // * The interrupt was already served
35 // * There is no user handler
36 // * It is a level interrupt, not an edge interrupt
37 if ( ((LPC_GPIO_X
->IST
& ch_bit
) == 0) ||
38 (channel_ids
[channel
] == 0 ) ||
39 (LPC_GPIO_X
->ISEL
& ch_bit
) ) return;
41 if ((LPC_GPIO_X
->IENR
& ch_bit
) && (LPC_GPIO_X
->RISE
& ch_bit
)) {
42 irq_handler(channel_ids
[channel
], IRQ_RISE
);
43 LPC_GPIO_X
->RISE
= ch_bit
;
45 if ((LPC_GPIO_X
->IENF
& ch_bit
) && (LPC_GPIO_X
->FALL
& ch_bit
)) {
46 irq_handler(channel_ids
[channel
], IRQ_FALL
);
47 LPC_GPIO_X
->FALL
= ch_bit
;
49 LPC_GPIO_X
->IST
= ch_bit
;
52 void gpio_irq0(void) {handle_interrupt_in(0);}
53 void gpio_irq1(void) {handle_interrupt_in(1);}
54 void gpio_irq2(void) {handle_interrupt_in(2);}
55 void gpio_irq3(void) {handle_interrupt_in(3);}
56 void gpio_irq4(void) {handle_interrupt_in(4);}
57 void gpio_irq5(void) {handle_interrupt_in(5);}
58 void gpio_irq6(void) {handle_interrupt_in(6);}
59 void gpio_irq7(void) {handle_interrupt_in(7);}
61 int gpio_irq_init(gpio_irq_t
*obj
, PinName pin
, gpio_irq_handler handler
, uint32_t id
) {
62 // PINT only supprt PIO0_*, PIO1_* and from PIO2_0 to PIO0_7 interrupt
63 if (pin
>= P2_8
) return -1;
65 irq_handler
= handler
;
67 int found_free_channel
= 0;
69 for (i
=0; i
<CHANNEL_NUM
; i
++) {
70 if (channel_ids
[i
] == 0) {
73 found_free_channel
= 1;
77 if (!found_free_channel
) return -1;
79 /* Enable AHB clock to the PIN, GPIO and IOCON domain. */
80 LPC_SYSCON
->SYSAHBCLKCTRL
|= ((1 << 19) | (1 << 16) | (1 << 7));
82 LPC_SYSCON
->PINTSEL
[obj
->ch
] = ((((pin
>> PORT_SHIFT
) & 0x3) * 24) + ((pin
>> PIN_SHIFT
) & 0x1F));
84 // Interrupt Wake-Up Enable
85 LPC_SYSCON
->STARTERP0
|= (1 << obj
->ch
);
87 LPC_GPIO_PORT
->DIR[(pin
>> PORT_SHIFT
) & 0x3] &= ~(1 << ((pin
>> PIN_SHIFT
) & 0x1F));
89 void (*channels_irq
)(void) = NULL
;
91 case 0: channels_irq
= &gpio_irq0
; break;
92 case 1: channels_irq
= &gpio_irq1
; break;
93 case 2: channels_irq
= &gpio_irq2
; break;
94 case 3: channels_irq
= &gpio_irq3
; break;
95 case 4: channels_irq
= &gpio_irq4
; break;
96 case 5: channels_irq
= &gpio_irq5
; break;
97 case 6: channels_irq
= &gpio_irq6
; break;
98 case 7: channels_irq
= &gpio_irq7
; break;
100 NVIC_SetVector((IRQn_Type
)(PININT_IRQ
+ obj
->ch
), (uint32_t)channels_irq
);
101 NVIC_EnableIRQ((IRQn_Type
)(PININT_IRQ
+ obj
->ch
));
106 void gpio_irq_free(gpio_irq_t
*obj
) {
107 channel_ids
[obj
->ch
] = 0;
108 LPC_SYSCON
->STARTERP0
&= ~(1 << obj
->ch
);
111 void gpio_irq_set(gpio_irq_t
*obj
, gpio_irq_event event
, uint32_t enable
) {
112 unsigned int ch_bit
= (1 << obj
->ch
);
115 if (!(LPC_GPIO_X
->ISEL
& ch_bit
))
116 LPC_GPIO_X
->IST
= ch_bit
;
119 LPC_GPIO_X
->ISEL
&= ~ch_bit
;
120 if (event
== IRQ_RISE
) {
122 LPC_GPIO_X
->IENR
|= ch_bit
;
124 LPC_GPIO_X
->IENR
&= ~ch_bit
;
128 LPC_GPIO_X
->IENF
|= ch_bit
;
130 LPC_GPIO_X
->IENF
&= ~ch_bit
;
135 void gpio_irq_enable(gpio_irq_t
*obj
) {
136 NVIC_EnableIRQ((IRQn_Type
)(PININT_IRQ
+ obj
->ch
));
139 void gpio_irq_disable(gpio_irq_t
*obj
) {
140 NVIC_DisableIRQ((IRQn_Type
)(PININT_IRQ
+ obj
->ch
));