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/*
* usb/endpt1.c -- USB endpoit 1 (HID) handling
*
* Copyright (C) 2016-2017 Tomasz Kramkowski <tk@the-tk.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <reg/usbotg.h>
#include <stddef.h>
#include <stdint.h>
#include "../uart/uart.h"
#include "bdt.h"
#include "endpt1.h"
#define MAX_PACKET 64
static unsigned char report[4][4] = {
{ 0x00, 5, 0, 0x00, },
{ 0x00, 0, 5, 0x00, },
{ 0x00, -5, 0, 0x00, },
{ 0x00, 0, -5, 0x00, },
};
static int nextrep;
void usb_endpt1_enable(void)
{
nextrep = 0;
usb_bdt[1][BDT_TX][BDT_EVEN].addr = &report[0];
usb_bdt[1][BDT_TX][BDT_EVEN].desc = USB0_BD_INIT(4, nextrep % 2);
nextrep++;
usb_bdt[1][BDT_TX][BDT_ODD].addr = &report[1];
usb_bdt[1][BDT_TX][BDT_ODD].desc = USB0_BD_INIT(4, nextrep % 2);
nextrep++;
USB0_ENDPT(1) = BV(ENDPT_EPTXEN) | BV(ENDPT_EPHSHK);
}
void usb_endpt1_disable(void)
{
USB0_ENDPT(1) = 0;
}
void usb_endpt1_token(uint8_t state)
{
volatile struct usb0_bd *bd;
bd = &usb_bdt[1][GET_BIT(state, STAT_TX)][GET_BIT(state, STAT_ODD)];
switch (GET_BITS(bd->desc, BD_TOK_PID)) {
case BD_TOK_PID_IN:
bd->addr = &report[nextrep];
bd->desc = USB0_BD_INIT(4, nextrep % 2);
nextrep = (nextrep + 1) % 4;
break;
}
}
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