source: rtems/bsps/arm/atsam/include/libchip/include/pio_it.h @ 9620dfa4

5
Last change on this file since 9620dfa4 was d60b6d7c, checked in by Christian Mauderer <christian.mauderer@…>, on 10/15/19 at 15:10:00

bsp/atsam: Add additional PIO helper.
  • Property mode set to 100644
File size: 4.9 KB
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1/* ---------------------------------------------------------------------------- */
2/*                  Atmel Microcontroller Software Support                      */
3/*                       SAM Software Package License                           */
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28/* ---------------------------------------------------------------------------- */
29
30/**
31 *  \file
32 *
33 *  \par Purpose
34 *
35 *  Configuration and handling of interrupts on PIO status changes. The API
36 *  provided here have several advantages over the traditional PIO interrupt
37 *  configuration approach:
38 *     - It is highly portable
39 *     - It automatically demultiplexes interrupts when multiples pins have been
40 *       configured on a single PIO controller
41 *     - It allows a group of pins to share the same interrupt
42 *
43 *  However, it also has several minor drawbacks that may prevent from using it
44 *  in particular applications:
45 *     - It enables the clocks of all PIO controllers
46 *     - PIO controllers all share the same interrupt handler, which does the
47 *       demultiplexing and can be slower than direct configuration
48 *     - It reserves space for a fixed number of interrupts, which can be
49 *       increased by modifying the appropriate constant in pio_it.c.
50 *
51 *  \par Usage
52 *
53 *  -# Initialize the PIO interrupt mechanism using PIO_InitializeInterrupts()
54 *     with the desired priority (0 ... 7).
55 *  -# Configure a status change interrupt on one or more pin(s) with
56 *     PIO_ConfigureIt().
57 *  -# Enable & disable interrupts on pins using PIO_EnableIt() and
58 *     PIO_DisableIt().
59 */
60
61#ifndef _PIO_IT_
62#define _PIO_IT_
63
64/*
65 *         Headers
66 */
67
68#include "pio.h"
69#include <rtems.h>
70
71#ifdef __cplusplus
72extern "C" {
73#endif
74
75/*
76 *         Global functions
77 */
78
79extern void PIO_InitializeInterrupts(uint32_t dwPriority);
80
81extern void PIO_ConfigureIt(const Pin *pPin,
82    void (*handler)(const Pin *, void *arg), void *arg);
83
84extern rtems_status_code PIO_RemoveIt(const Pin *pPin,
85    void (*handler)(const Pin *, void *arg), void *arg);
86
87/**
88 * Enables the given interrupt source if it has been configured. The status
89 * register of the corresponding PIO controller is cleared prior to enabling
90 * the interrupt.
91 * \param pPin  Interrupt source to enable.
92 */
93static inline void PIO_EnableIt(const Pin *pPin)
94{
95        pPin->pio->PIO_ISR;
96        pPin->pio->PIO_IER = pPin->mask;
97}
98
99/**
100 * Disables a given interrupt source, with no added side effects.
101 *
102 * \param pPin  Interrupt source to disable.
103 */
104static inline void PIO_DisableIt(const Pin *pPin)
105{
106        pPin->pio->PIO_IDR = pPin->mask;
107}
108
109/**
110 * Check whether a given interrupt source is active.
111 *
112 * \param pPin  Interrupt source to check.
113 */
114static inline bool PIO_ItIsActive(const Pin *pPin)
115{
116        return ((pPin->pio->PIO_IMR & pPin->mask) != 0);
117}
118
119extern void PIO_IT_InterruptHandler(void);
120
121extern void PioInterruptHandler(uint32_t id, Pio *pPio);
122
123extern void PIO_CaptureHandler(void);
124
125#ifdef __cplusplus
126}
127#endif
128
129#endif /* #ifndef _PIO_IT_ */
130
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