joystick.c File Reference

#include "joystick.h"
#include "rit.h"
#include <LPC17xx.h>
#include <stdlib.h>

Go to the source code of this file.

Classes
struct	FunctionWrapper

Functions
_PRIVATE void	handle_polling (void)
JOYSTICK_Error	JOYSTICK_Init (void)
	Initializes the joystick peripheral with the given options.
void	JOYSTICK_Deinit (void)
	Deinitializes the joystick, by removing all functions associated with the actions, and removing the polling job from the RIT.
void	JOYSTICK_EnableAction (JOYSTICK_Action action)
	Enables the specified action, thus enabling the binding with the associated functionality, if set.
void	JOYSTICK_DisableAction (JOYSTICK_Action action)
	Disables the specific action, and disables the binding with its functionality, without un-binding it completely.
void	JOYSTICK_SetFunction (JOYSTICK_Action action, JOYSTICK_Function function)
	Sets a functionality for the given action.
void	JOYSTICK_UnsetFunction (JOYSTICK_Action action)
	Unsets a functionality for the given action, if previously set.

Variables
_PRIVATE FunctionWrapper	functions [JOY_ACTION_COUNT] = {0}
	Array of function pointers containing the hanlder for each joystick function.

Function Documentation

handle_polling()

_PRIVATE void handle_polling

(

void

)

Definition at line 18 of file joystick.c.

{
    if ((LPC_GPIO1->FIOPIN & (1 << 29)) == 0 && functions[JOY_ACTION_UP].function && functions[JOY_ACTION_UP].enabled)
        functions[JOY_ACTION_UP].function();
 
    if ((LPC_GPIO1->FIOPIN & (1 << 25)) == 0 && functions[JOY_ACTION_SEL].function && functions[JOY_ACTION_SEL].enabled)
        functions[JOY_ACTION_SEL].function();
 
    if ((LPC_GPIO1->FIOPIN & (1 << 26)) == 0 && functions[JOY_ACTION_DOWN].function &&
        functions[JOY_ACTION_DOWN].enabled)
        functions[JOY_ACTION_DOWN].function();
 
    if ((LPC_GPIO1->FIOPIN & (1 << 27)) == 0 && functions[JOY_ACTION_LEFT].function &&
        functions[JOY_ACTION_LEFT].enabled)
        functions[JOY_ACTION_LEFT].function();
 
    if ((LPC_GPIO1->FIOPIN & (1 << 28)) == 0 && functions[JOY_ACTION_RIGHT].function &&
        functions[JOY_ACTION_RIGHT].enabled)
        functions[JOY_ACTION_RIGHT].function();
}

JOYSTICK_Deinit()

void JOYSTICK_Deinit

(

void

)

Deinitializes the joystick, by removing all functions associated with the actions, and removing the polling job from the RIT.

Definition at line 58 of file joystick.c.

{
    RIT_RemoveJob(handle_polling);
}

JOYSTICK_DisableAction()

void JOYSTICK_DisableAction

(

JOYSTICK_Action

action

)

Disables the specific action, and disables the binding with its functionality, without un-binding it completely.

Parameters

action

The action to disable.

Definition at line 86 of file joystick.c.

{
    if ((u8)action == JOY_ACTION_ALL)
    {
        for (u8 i = 0; i < JOY_ACTION_COUNT; i++)
        {
            if (!functions[i].function || !functions[i].enabled)
                continue;
 
            functions[i].enabled = false;
        }
 
        return;
    }
 
    if (!functions[action].function)
        return; // No function associated.
 
    functions[action].enabled = false;
}

JOYSTICK_EnableAction()

void JOYSTICK_EnableAction

(

JOYSTICK_Action

action

)

Enables the specified action, thus enabling the binding with the associated functionality, if set.

Parameters

action

The action to enable.

Definition at line 65 of file joystick.c.

{
    if ((u8)action == JOY_ACTION_ALL)
    {
        for (u8 i = 0; i < JOY_ACTION_COUNT; i++)
        {
            if (!functions[i].function || functions[i].enabled)
                continue;
 
            functions[i].enabled = true;
        }
 
        return;
    }
 
    if (!functions[action].function)
        return; // No function associated.
 
    functions[action].enabled = true;
}

JOYSTICK_Init()

JOYSTICK_Error JOYSTICK_Init

(

void

)

Initializes the joystick peripheral with the given options.

Parameters

options

Joystick options from the JOYSTICK_Config enum

Definition at line 41 of file joystick.c.

{
    // Joystick PINS are 1.25 to 1.29. Need to set them as GPIO
    // These go from bit 18 to 27 in the PINSEL3 register.
    LPC_PINCON->PINSEL3 &= ~(0x3FF << 18);
 
    // Setting Pin 25-29 as inputs (0) in the FIODIR for GPIO1
    LPC_GPIO1->FIODIR &= ~(0x1F << 25);
 
    if (!RIT_IsEnabled())
        return JOY_ERR_RIT_UNINIT;
 
    RIT_AddJob(handle_polling, RIT_NO_DIVIDER);
    RIT_EnableJob(handle_polling);
    return JOY_ERR_OK;
}

JOYSTICK_SetFunction()

void JOYSTICK_SetFunction	(	JOYSTICK_Action	action,
		JOYSTICK_Function	function
	)

Sets a functionality for the given action.

Parameters

action	The action associated to the functionality
function	The functionality.

Definition at line 107 of file joystick.c.

{
    functions[action] = (FunctionWrapper){
        .function = function,
        .enabled = false,
    };
}

JOYSTICK_UnsetFunction()

void JOYSTICK_UnsetFunction

(

JOYSTICK_Action

action

)

Unsets a functionality for the given action, if previously set.

Parameters

action

The action to un-bind.

Definition at line 115 of file joystick.c.

{
    functions[action] = (FunctionWrapper){
        .function = NULL,
        .enabled = false,
    };
}

Variable Documentation

functions

_PRIVATE FunctionWrapper functions[JOY_ACTION_COUNT] = {0}

Array of function pointers containing the hanlder for each joystick function.

Definition at line 14 of file joystick.c.

{0};