usb_ps3pad.c

/* Teensyduino Core Library
 * http://www.pjrc.com/teensy/
 * Copyright (c) 2013 PJRC.COM, LLC.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * 1. The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * 2. If the Software is incorporated into a build system that allows
 * selection among a list of target devices, then similar target
 * devices manufactured by PJRC.COM must be included in the list of
 * target devices and selectable in the same manner.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "usb_dev.h"
#include "usb_ps3pad.h"
#include "core_pins.h" // for yield()
//#include "HardwareSerial.h"
#include <string.h> // for memcpy()
#include <avr/pgmspace.h>

#ifdef PS3PAD_INTERFACE // defined by usb_dev.h -> usb_desc.h

const ps3pad_state_t PROGMEM ps3pad_idle_state = {
	.triangle_btn = 0, .square_btn = 0, .cross_btn = 0, .circle_btn = 0,
	.l1_btn = 0, .r1_btn = 0, .l2_btn = 0, .r2_btn = 0,
	.select_btn = 0, .start_btn = 0, .ps_btn = 0,
	.direction = 0x08,
	.l_x_axis = 0x80, .l_y_axis = 0x80, .r_x_axis = 0x80, .r_y_axis = 0x80,
	.unknown = {0x00, 0x00, 0x00, 0x00},
	.circle_axis = 0x00, .cross_axis = 0x00, .square_axis = 0x00, .triangle_axis = 0x00,
	.l1_axis = 0x00, .r1_axis = 0x00, .l2_axis = 0x00, .r2_axis = 0x00
};

ps3pad_state_t ps3pad_state;

// Maximum number of transmit packets to queue so we don't starve other endpoints for memory
#define TX_PACKET_LIMIT 3

static uint8_t transmit_previous_timeout = 0;

// When the PC isn't listening, how long do we wait before discarding data?
#define TX_TIMEOUT_MSEC 30

#if F_CPU == 168000000
	#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1100)
#elif F_CPU == 144000000
	#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 932)
#elif F_CPU == 120000000
	#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 764)
#elif F_CPU == 96000000
	#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 596)
#elif F_CPU == 72000000
	#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 512)
#elif F_CPU == 48000000
	#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 428)
#elif F_CPU == 24000000
	#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 262)
#endif

usb_ps3pad_reset_state(void) {
	memcpy_P(&ps3pad_state, &ps3pad_idle_state, sizeof(ps3pad_state_t));
}

uint8_t usb_ps3pad_send(void)
{
	uint32_t wait_count = 0;
	usb_packet_t *tx_packet;

	//serial_print("send");
	//serial_print("\n");
	
	while (1) {
		if (!usb_configuration) {
		//serial_print("error1\n");
			return -1;
		}
		if (usb_tx_packet_count(PS3PAD_ENDPOINT) < TX_PACKET_LIMIT) {
			tx_packet = usb_malloc();
			if (tx_packet) break;
		}
		if (++wait_count > TX_TIMEOUT || transmit_previous_timeout) {
			transmit_previous_timeout = 1;
		//serial_print("error2\n");
			return -1;
		}
		yield();
	}
	
	transmit_previous_timeout = 0;
	uint8_t len = sizeof(ps3pad_state_t);
	memcpy(tx_packet->buf, &ps3pad_state, len);
	tx_packet->len = len;
	usb_tx(PS3PAD_ENDPOINT, tx_packet);
	//serial_print("ok\n");
	
	return 0;
}

#endif // ps3pad_INTERFACE