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touchpad.c@0:b3e50e98acac, 2011-08-13 (annotated)

Committer:: Gonzakpo
Date:: Sat Aug 13 17:35:52 2011 +0000
Revision:: 0:b3e50e98acac

Who changed what in which revision?

User	Revision	Line number	New contents of line
Gonzakpo	0:b3e50e98acac	1
Gonzakpo	0:b3e50e98acac	2	/* Esta rutina de touchpad esta pensada especificamente para la aplicacion del KaossPad */
Gonzakpo	0:b3e50e98acac	3	/* Si se quisiera portar a otro proyecto se deber� agregar una configuracion inicial del ADC */
Gonzakpo	0:b3e50e98acac	4	/* As� como esta presupone que el ADC ya est� corriendo (modo BURST) */
Gonzakpo	0:b3e50e98acac	5
Gonzakpo	0:b3e50e98acac	6	#include "touchpad.h"
Gonzakpo	0:b3e50e98acac	7
Gonzakpo	0:b3e50e98acac	8	/* Configuracion del touchpad */
Gonzakpo	0:b3e50e98acac	9	/*
Gonzakpo	0:b3e50e98acac	10	* AD0.4 OPEN-DRAIN OPEN-DRAIN AD0.5
Gonzakpo	0:b3e50e98acac	11	* P1[30] P2[0] P2[1] P1[31]
Gonzakpo	0:b3e50e98acac	12	* \| \| \| \|
Gonzakpo	0:b3e50e98acac	13	* \| _____________\|______________ \| \|
Gonzakpo	0:b3e50e98acac	14	* \| \| \| \| \|
Gonzakpo	0:b3e50e98acac	15	* \| \| \| \| \|
Gonzakpo	0:b3e50e98acac	16	* \|__________\| Touchpad \|________\| \|
Gonzakpo	0:b3e50e98acac	17	* \| \| \|
Gonzakpo	0:b3e50e98acac	18	* \| \| \|
Gonzakpo	0:b3e50e98acac	19	* \|____________________________\| \|
Gonzakpo	0:b3e50e98acac	20	* \| \|
Gonzakpo	0:b3e50e98acac	21	* \|______________________________________\|
Gonzakpo	0:b3e50e98acac	22	*/
Gonzakpo	0:b3e50e98acac	23
Gonzakpo	0:b3e50e98acac	24	void init_touchpad() {
Gonzakpo	0:b3e50e98acac	25	/* P2[0] y P2[1] se configuran como GPIO */
Gonzakpo	0:b3e50e98acac	26	LPC_PINCON->PINSEL4 &= ~(((unsigned int)0x3 << 0) \| ((unsigned int)0x3 << 2));
Gonzakpo	0:b3e50e98acac	27
Gonzakpo	0:b3e50e98acac	28	/Deshabilito todas las R de pullup y pulldown (de P2[0], P2[1], P1[30] y P1[31])/
Gonzakpo	0:b3e50e98acac	29	LPC_PINCON->PINMODE4 \|= ((unsigned int)0x2 << 0) \| ((unsigned int)0x2 << 2);
Gonzakpo	0:b3e50e98acac	30	LPC_PINCON->PINMODE3 \|= ((unsigned int)0x2 << 28) \| ((unsigned int)0x2 << 30);
Gonzakpo	0:b3e50e98acac	31
Gonzakpo	0:b3e50e98acac	32	/* P2[0] y P2[1] se configuran como salidas */
Gonzakpo	0:b3e50e98acac	33	LPC_GPIO2->FIODIR \|= ((unsigned int)0x1 << 0) \| ((unsigned int)0x1 << 1);
Gonzakpo	0:b3e50e98acac	34
Gonzakpo	0:b3e50e98acac	35	/* P2[0] y P2[1] se configuran como Open-Drain */
Gonzakpo	0:b3e50e98acac	36	LPC_PINCON->PINMODE_OD2 \|= ((unsigned int)0x1 << 0) \| ((unsigned int)0x1 << 1);
Gonzakpo	0:b3e50e98acac	37
Gonzakpo	0:b3e50e98acac	38	/* Los pines P1[31] y P1[30] funcionaran tanto como ADC como GPIO
Gonzakpo	0:b3e50e98acac	39	* y por eso no se configuran inicialmente */
Gonzakpo	0:b3e50e98acac	40	}
Gonzakpo	0:b3e50e98acac	41
Gonzakpo	0:b3e50e98acac	42	touchpad_position get_position(void) {
Gonzakpo	0:b3e50e98acac	43	touchpad_position positions;
Gonzakpo	0:b3e50e98acac	44	int i;
Gonzakpo	0:b3e50e98acac	45
Gonzakpo	0:b3e50e98acac	46	/* Paro Modo Burst y desactivo canal AD0.0 (del audio) */
Gonzakpo	0:b3e50e98acac	47	LPC_ADC->ADCR &= ~(((unsigned int)0x1 << 16) \| ((unsigned int)0x1 << 0));
Gonzakpo	0:b3e50e98acac	48
Gonzakpo	0:b3e50e98acac	49	/* Configuro el touchpad para que me indique la posicion de X */
Gonzakpo	0:b3e50e98acac	50
Gonzakpo	0:b3e50e98acac	51	LPC_PINCON->PINSEL3 \|= ((unsigned int)0x3 << 30); /* P1[31] -> AD0.5 */
Gonzakpo	0:b3e50e98acac	52	LPC_PINCON->PINSEL3 &= ~((unsigned int)0x3 << 28); /* P1[30] -> GPIO */
Gonzakpo	0:b3e50e98acac	53	LPC_GPIO1->FIODIR \|= ((unsigned int)0x1 << 30); /* P1[30] es una salida */
Gonzakpo	0:b3e50e98acac	54
Gonzakpo	0:b3e50e98acac	55	LPC_GPIO2->FIOCLR \|= ((unsigned int)0x1 << 1); /* Pongo en 0 el pin P2[1] */
Gonzakpo	0:b3e50e98acac	56	LPC_GPIO2->FIOSET \|= ((unsigned int)0x1 << 0); /* Pongo en 1 el pin P2[0] */
Gonzakpo	0:b3e50e98acac	57	LPC_GPIO1->FIOSET \|= ((unsigned int)0x1 << 20); /* Pongo en 1 el pin P1[30] */
Gonzakpo	0:b3e50e98acac	58
Gonzakpo	0:b3e50e98acac	59	/* Delay de 1uS aprox. para que se estabilizen las lineas */
Gonzakpo	0:b3e50e98acac	60	for (i = 0; i < 100; i++);
Gonzakpo	0:b3e50e98acac	61
Gonzakpo	0:b3e50e98acac	62	/* Activo canal AD0.5 (coordenada X) */
Gonzakpo	0:b3e50e98acac	63	LPC_ADC->ADCR \|= ((unsigned int)0x1 << 5);
Gonzakpo	0:b3e50e98acac	64
Gonzakpo	0:b3e50e98acac	65	/* Comienzo la conversion */
Gonzakpo	0:b3e50e98acac	66	LPC_ADC->ADCR \|= ((unsigned int)0x1 << 24);
Gonzakpo	0:b3e50e98acac	67
Gonzakpo	0:b3e50e98acac	68	/* Espero a que se complete la conversion */
Gonzakpo	0:b3e50e98acac	69	while ( (LPC_ADC->ADDR5 & 0x80000000) == 0x0 ) {
Gonzakpo	0:b3e50e98acac	70	}
Gonzakpo	0:b3e50e98acac	71
Gonzakpo	0:b3e50e98acac	72	/* Almaceno la posicion X */
Gonzakpo	0:b3e50e98acac	73	positions.pos_x = ((LPC_ADC->ADDR5 & ((unsigned int)0x7 << 12)) >> 12 );
Gonzakpo	0:b3e50e98acac	74
Gonzakpo	0:b3e50e98acac	75	/* Desactivo canal AD0.5 (coordenada X) */
Gonzakpo	0:b3e50e98acac	76	LPC_ADC->ADCR &= ~((unsigned int)0x1 << 5);
Gonzakpo	0:b3e50e98acac	77
Gonzakpo	0:b3e50e98acac	78	/* Configuro el touchpad para que me indique la posicion de Y */
Gonzakpo	0:b3e50e98acac	79
Gonzakpo	0:b3e50e98acac	80	LPC_PINCON->PINSEL3 &= ~((unsigned int)0x3 << 30); /* P1[31] -> GPIO */
Gonzakpo	0:b3e50e98acac	81	LPC_PINCON->PINSEL3 \|= ((unsigned int)0x3 << 28); /* P1[30] -> AD0.4 */
Gonzakpo	0:b3e50e98acac	82	LPC_GPIO1->FIODIR \|= ((unsigned int)0x1 << 31); /* P1[31] es una salida */
Gonzakpo	0:b3e50e98acac	83
Gonzakpo	0:b3e50e98acac	84	LPC_GPIO2->FIOSET \|= ((unsigned int)0x1 << 1); /* Pongo en 1 el pin P2[1] */
Gonzakpo	0:b3e50e98acac	85	LPC_GPIO2->FIOCLR \|= ((unsigned int)0x1 << 0); /* Pongo en 0 el pin P2[0] */
Gonzakpo	0:b3e50e98acac	86	LPC_GPIO1->FIOSET \|= ((unsigned int)0x1 << 31); /* Pongo en 1 el pin P1[31] */
Gonzakpo	0:b3e50e98acac	87
Gonzakpo	0:b3e50e98acac	88	/* Delay de 1uS aprox. para que se estabilizen las lineas */
Gonzakpo	0:b3e50e98acac	89	for (i = 0; i < 100; i++);
Gonzakpo	0:b3e50e98acac	90
Gonzakpo	0:b3e50e98acac	91	/* Activo canal AD0.4 (coordenada Y) */
Gonzakpo	0:b3e50e98acac	92	LPC_ADC->ADCR \|= ((unsigned int)0x1 << 4);
Gonzakpo	0:b3e50e98acac	93
Gonzakpo	0:b3e50e98acac	94	/* Comienzo la conversion */
Gonzakpo	0:b3e50e98acac	95	LPC_ADC->ADCR \|= ((unsigned int)0x1 << 24);
Gonzakpo	0:b3e50e98acac	96
Gonzakpo	0:b3e50e98acac	97	/* Espero a que se complete la conversion */
Gonzakpo	0:b3e50e98acac	98	while ( (LPC_ADC->ADDR4 & (unsigned int)0x80000000) == (unsigned int)0x0 ) {
Gonzakpo	0:b3e50e98acac	99	}
Gonzakpo	0:b3e50e98acac	100
Gonzakpo	0:b3e50e98acac	101	/* Almaceno la posicion Y */
Gonzakpo	0:b3e50e98acac	102	positions.pos_y = (((LPC_ADC->ADDR4) & ((unsigned int)0xF << 12)) >> 12 );
Gonzakpo	0:b3e50e98acac	103
Gonzakpo	0:b3e50e98acac	104	/* Desactivo canal AD0.4 (coordenada Y) */
Gonzakpo	0:b3e50e98acac	105	LPC_ADC->ADCR &= ~((unsigned int)0x1 << 4);
Gonzakpo	0:b3e50e98acac	106
Gonzakpo	0:b3e50e98acac	107	/* Restauro configuracion del ADC */
Gonzakpo	0:b3e50e98acac	108
Gonzakpo	0:b3e50e98acac	109	/* Activo canal AD0.0 (del audio) */
Gonzakpo	0:b3e50e98acac	110	LPC_ADC->ADCR \|= ((unsigned int)0x1 << 0);
Gonzakpo	0:b3e50e98acac	111
Gonzakpo	0:b3e50e98acac	112	/* Activo modo Burst */
Gonzakpo	0:b3e50e98acac	113	LPC_ADC->ADCR \|= ((unsigned int)0x1 << 16);
Gonzakpo	0:b3e50e98acac	114
Gonzakpo	0:b3e50e98acac	115
Gonzakpo	0:b3e50e98acac	116	return positions;
Gonzakpo	0:b3e50e98acac	117	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	13 Aug 2011
Imports:	36
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	2

touchpad.c@0:b3e50e98acac, 2011-08-13 (annotated)

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