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- /* 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_rawhid.h"
- #include "core_pins.h" // for yield(), millis()
- #include <string.h> // for memcpy()
- //#include "HardwareSerial.h"
-
- #ifdef RAWHID_INTERFACE // defined by usb_dev.h -> usb_desc.h
- #if F_CPU >= 20000000
-
- int usb_rawhid_recv(void *buffer, uint32_t timeout)
- {
- usb_packet_t *rx_packet;
- uint32_t begin = millis();
-
- while (1) {
- if (!usb_configuration) return -1;
- rx_packet = usb_rx(RAWHID_RX_ENDPOINT);
- if (rx_packet) break;
- if (millis() - begin > timeout || !timeout) return 0;
- yield();
- }
- memcpy(buffer, rx_packet->buf, RAWHID_RX_SIZE);
- usb_free(rx_packet);
- return RAWHID_RX_SIZE;
- }
-
- int usb_rawhid_available(void)
- {
- uint32_t count;
-
- if (!usb_configuration) return 0;
- count = usb_rx_byte_count(RAWHID_RX_ENDPOINT);
- return count;
- }
-
- // Maximum number of transmit packets to queue so we don't starve other endpoints for memory
- #define TX_PACKET_LIMIT 4
-
- int usb_rawhid_send(const void *buffer, uint32_t timeout)
- {
- usb_packet_t *tx_packet;
- uint32_t begin = millis();
-
- while (1) {
- if (!usb_configuration) return -1;
- if (usb_tx_packet_count(RAWHID_TX_ENDPOINT) < TX_PACKET_LIMIT) {
- tx_packet = usb_malloc();
- if (tx_packet) break;
- }
- if (millis() - begin > timeout) return 0;
- yield();
- }
- memcpy(tx_packet->buf, buffer, RAWHID_TX_SIZE);
- tx_packet->len = RAWHID_TX_SIZE;
- usb_tx(RAWHID_TX_ENDPOINT, tx_packet);
- return RAWHID_TX_SIZE;
- }
-
- #endif // F_CPU
- #endif // RAWHID_INTERFACE
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