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controller/Output/pjrcUSB/arm/usb_keyboard.c

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/* Teensyduino Core Library
* http://www.pjrc.com/teensy/
* Copyright (c) 2013 PJRC.COM, LLC.
* Modifications by Jacob Alexander 2013-2014
*
* 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.
*/
// ----- Includes -----
// Compiler Includes
#include <string.h> // for memcpy()
// Project Includes
#include <Lib/OutputLib.h>
#include <print.h>
// Local Includes
#include "usb_dev.h"
#include "usb_keyboard.h"
// ----- Defines -----
// Maximum number of transmit packets to queue so we don't starve other endpoints for memory
#define TX_PACKET_LIMIT 4
// When the PC isn't listening, how long do we wait before discarding data?
#define TX_TIMEOUT_MSEC 50
#if F_CPU == 96000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 596)
#elif F_CPU == 48000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 428)
#elif F_CPU == 24000000
#define TX_TIMEOUT (TX_TIMEOUT_MSEC * 262)
#endif
// ----- Variables -----
static uint8_t transmit_previous_timeout = 0;
// ----- Functions -----
// send the contents of keyboard_keys and keyboard_modifier_keys
void usb_keyboard_send()
{
uint32_t wait_count = 0;
usb_packet_t *tx_packet;
// Wait till ready
while ( 1 )
{
if ( !usb_configuration )
{
erro_print("USB not configured...");
return;
}
if ( USBKeys_Protocol == 0 ) // Boot Mode
{
if ( usb_tx_packet_count( NKRO_KEYBOARD_ENDPOINT ) < TX_PACKET_LIMIT )
{
tx_packet = usb_malloc();
if ( tx_packet )
break;
}
}
else if ( USBKeys_Protocol == 1 ) // NKRO Mode
{
if ( usb_tx_packet_count( KEYBOARD_ENDPOINT ) < TX_PACKET_LIMIT )
{
tx_packet = usb_malloc();
if ( tx_packet )
break;
}
}
if ( ++wait_count > TX_TIMEOUT || transmit_previous_timeout )
{
transmit_previous_timeout = 1;
warn_print("USB Transmit Timeout...");
return;
}
yield();
}
// Pointer to USB tx packet buffer
uint8_t *tx_buf = tx_packet->buf;
switch ( USBKeys_Protocol )
{
// Send boot keyboard interrupt packet(s)
case 0:
// Boot Mode
*tx_buf++ = USBKeys_Modifiers;
*tx_buf++ = 0;
memcpy( tx_buf, USBKeys_Keys, USB_BOOT_MAX_KEYS );
tx_packet->len = 8;
// Send USB Packet
usb_tx( KEYBOARD_ENDPOINT, tx_packet );
USBKeys_Changed = USBKeyChangeState_None;
break;
// Send NKRO keyboard interrupts packet(s)
case 1:
// Check modifiers
if ( USBKeys_Changed & USBKeyChangeState_Modifiers )
{
*tx_buf++ = 0x01; // ID
*tx_buf = USBKeys_Modifiers;
tx_packet->len = 2;
// Send USB Packet
usb_tx( NKRO_KEYBOARD_ENDPOINT, tx_packet );
USBKeys_Changed &= ~USBKeyChangeState_Modifiers; // Mark sent
}
// Check main key section
else if ( USBKeys_Changed & USBKeyChangeState_MainKeys )
{
*tx_buf++ = 0x03; // ID
// 4-49 (first 6 bytes)
memcpy( tx_buf, USBKeys_Keys, 6 );
tx_packet->len = 7;
// Send USB Packet
usb_tx( NKRO_KEYBOARD_ENDPOINT, tx_packet );
USBKeys_Changed &= ~USBKeyChangeState_MainKeys; // Mark sent
}
// Check secondary key section
else if ( USBKeys_Changed & USBKeyChangeState_SecondaryKeys )
{
*tx_buf++ = 0x04; // ID
// 51-164 (Middle 15 bytes)
memcpy( tx_buf, USBKeys_Keys + 6, 15 );
tx_packet->len = 16;
// Send USB Packet
usb_tx( NKRO_KEYBOARD_ENDPOINT, tx_packet );
USBKeys_Changed &= ~USBKeyChangeState_SecondaryKeys; // Mark sent
}
// Check tertiary key section
else if ( USBKeys_Changed & USBKeyChangeState_TertiaryKeys )
{
*tx_buf++ = 0x05; // ID
// 176-221 (last 6 bytes)
memcpy( tx_buf, USBKeys_Keys + 21, 6 );
tx_packet->len = 7;
// Send USB Packet
usb_tx( NKRO_KEYBOARD_ENDPOINT, tx_packet );
USBKeys_Changed &= ~USBKeyChangeState_TertiaryKeys; // Mark sent
}
// Check system control keys
else if ( USBKeys_Changed & USBKeyChangeState_System )
{
*tx_buf++ = 0x06; // ID
*tx_buf = USBKeys_SysCtrl;
tx_packet->len = 2;
// Send USB Packet
usb_tx( NKRO_KEYBOARD_ENDPOINT, tx_packet );
USBKeys_Changed &= ~USBKeyChangeState_System; // Mark sent
}
// Check consumer control keys
else if ( USBKeys_Changed & USBKeyChangeState_Consumer )
{
*tx_buf++ = 0x07; // ID
*tx_buf++ = (uint8_t)(USBKeys_ConsCtrl & 0x00FF);
*tx_buf = (uint8_t)(USBKeys_ConsCtrl >> 8);
tx_packet->len = 3;
// Send USB Packet
usb_tx( NKRO_KEYBOARD_ENDPOINT, tx_packet );
USBKeys_Changed &= ~USBKeyChangeState_Consumer; // Mark sent
}
break;
}
return;
}