Add 'teensytp/' from commit 'be48e888050f18a31e788269c8f47358036a8e3b'

[megadrive.git] / teensytp / teensy3 / usb_rawhid.c

diff --git a/teensytp/teensy3/usb_rawhid.c b/teensytp/teensy3/usb_rawhid.c
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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
+
+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 // RAWHID_INTERFACE