hsk_ex.h

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/** \file
 * HSK External Interrupt Routing headers
 *
 * This file offers functions to activate external interrupts and connect
 * them to the available input pins.
 *
 * @author kami
 */

#ifndef _HSK_EX_H_
#define _HSK_EX_H_

/*
 * C51 does not include the used register bank in pointer types.
 */
#ifdef __C51__
        #define using(bank)
#endif

/*
 * SDCC does not like the \c code keyword for function pointers, C51 needs it
 * or it will use generic pointers.
 */
#ifdef SDCC
        #undef code
        #define code
#endif /* SDCC */

/**
 * Typedef for externel interrupt channels.
 */
typedef ubyte hsk_ex_channel;

/**
 * \defgroup EX_EXINT External Interrupt Channels
 *
 * This group consists of defines representing external interrupt channels.
 *
 * @{
 */

/**
 * External interrupt channel EXINT0.
 *
 * Mask with EA, disable with EX0.
 */
#define EX_EXINT0       0

/**
 * External interrupt channel EXINT1.
 *
 * Mask with EA, disable with EX1.
 */
#define EX_EXINT1       1

/**
 * External interrupt channel EXINT2.
 *
 * Mask with EX2.
 */
#define EX_EXINT2       2

/**
 * External interrupt channel EXINT3.
 *
 * Mask with EXM.
 */
#define EX_EXINT3       3

/**
 * External interrupt channel EXINT4.
 *
 * Mask with EXM.
 */
#define EX_EXINT4       4

/**
 * External interrupt channel EXINT5.
 *
 * Mask with EXM.
 */
#define EX_EXINT5       5

/**
 * External interrupt channel EXINT6.
 *
 * Mask with EXM.
 */
#define EX_EXINT6       6

/**
 * @}
 */

/**
 * \defgroup EX_EDGE External Interrupt Triggers
 *
 * This group contains defines representing the different edge triggers
 *
 * @{
 */

/**
 * Trigger interrupt on rising edge.
 */
#define EX_EDGE_RISING  0

/**
 * Trigger interrupt on falling edge.
 */
#define EX_EDGE_FALLING 1

/**
 * Trigger interrupt on both edges.
 */
#define EX_EDGE_BOTH    2

/**
 * @}
 */

/**
 * Enable an external interrupt channel.
 *
 * It is good practice to enable a port for the channel first, because
 * port changes on an active interrupt may cause an undesired interrupt.
 *
 * The callback function can be set to 0 if a change of the function is
 * not desired. For channels EXINT0 and EXINT1 the callback is ignored,
 * implement interrupts 0 and 2 instead.
 *
 * @param channel
 *      The channel to activate, one of \ref EX_EXINT
 * @param edge
 *      The triggering edge, one of \ref EX_EDGE
 * @param callback
 *      The callback function for an interrupt event
 */
void hsk_ex_channel_enable(const hsk_ex_channel channel,
        const ubyte edge,
        const void (code * const callback)(void) using(1));

/**
 * Disables an external interrupt channel.
 *
 * @param channel
 *      The channel to disable, one of \ref EX_EXINT
 */
void hsk_ex_channel_disable(const hsk_ex_channel channel);

/**
 * Typedef for externel interrupt ports.
 */
typedef ubyte hsk_ex_port;

/**
 * \defgroup EX_EXINT_P External Interrupt Input Ports
 *
 * Each define of this group represents an external interrupt port
 * configuration
 *
 * @{
 */

/**
 * External interrupt EXINT0 input port P0.5.
 */
#define EX_EXINT0_P05   0

/**
 * External interrupt EXINT3 input port P1.1.
 */
#define EX_EXINT3_P11   1

/**
 * External interrupt EXINT0 input port P1.4.
 */
#define EX_EXINT0_P14   2

/**
 * External interrupt EXINT5 input port P1.5.
 */
#define EX_EXINT5_P15   3

/**
 * External interrupt EXINT6 input port P1.6.
 */
#define EX_EXINT6_P16   4

/**
 * External interrupt EXINT3 input port P3.0.
 */
#define EX_EXINT3_P30   5

/**
 * External interrupt EXINT4 input port P3.2.
 */
#define EX_EXINT4_P32   6

/**
 * External interrupt EXINT5 input port P3.3.
 */
#define EX_EXINT5_P33   7

/**
 * External interrupt EXINT6 input port P3.4.
 */
#define EX_EXINT6_P34   8

/**
 * External interrupt EXINT4 input port P3.7.
 */
#define EX_EXINT4_P37   9

/**
 * External interrupt EXINT3 input port P4.0.
 */
#define EX_EXINT3_P40   10

/**
 * External interrupt EXINT4 input port P4.1.
 */
#define EX_EXINT4_P41   11

/**
 * External interrupt EXINT6 input port P4.2.
 */
#define EX_EXINT6_P42   12

/**
 * External interrupt EXINT5 input port P4.4.
 */
#define EX_EXINT5_P44   13

/**
 * External interrupt EXINT6 input port P4.5.
 */
#define EX_EXINT6_P45   14

/**
 * External interrupt EXINT1 input port P5.0.
 */
#define EX_EXINT1_P50   15

/**
 * External interrupt EXINT2 input port P5.1.
 */
#define EX_EXINT2_P51   16

/**
 * External interrupt EXINT5 input port P5.2.
 */
#define EX_EXINT5_P52   17

/**
 * External interrupt EXINT1 input port P5.3.
 */
#define EX_EXINT1_P53   18

/**
 * External interrupt EXINT2 input port P5.4.
 */
#define EX_EXINT2_P54   19

/**
 * External interrupt EXINT3 input port P5.5.
 */
#define EX_EXINT3_P55   20

/**
 * External interrupt EXINT4 input port P5.6.
 */
#define EX_EXINT4_P56   21

/**
 * External interrupt EXINT6 input port P5.7.
 */
#define EX_EXINT6_P57   22

/**
 * @}
 */

/**
 * Opens an input port for an external interrupt.
 *
 * @param port
 *      The port to open, one of \ref EX_EXINT_P
 */
void hsk_ex_port_open(const hsk_ex_port port);

/**
 * Disconnects an input port from an external interrupt.
 *
 * @param port
 *      The port to close, one of \ref EX_EXINT_P
 */
void hsk_ex_port_close(const hsk_ex_port port);

/*
 * Restore the usual meaning of \c code.
 */
#ifdef SDCC
        #undef code
        #define code    __code
#endif

/*
 * Restore the usual meaning of \c using(bank).
 */
#ifdef __C51__
        #undef using
#endif /* __C51__ */

#endif /* _HSK_EX_H_ */