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1 | /* Teensyduino Core Library |
2 | * http://www.pjrc.com/teensy/ |
3 | * Copyright (c) 2013 PJRC.COM, LLC. |
4 | * |
5 | * Permission is hereby granted, free of charge, to any person obtaining |
6 | * a copy of this software and associated documentation files (the |
7 | * "Software"), to deal in the Software without restriction, including |
8 | * without limitation the rights to use, copy, modify, merge, publish, |
9 | * distribute, sublicense, and/or sell copies of the Software, and to |
10 | * permit persons to whom the Software is furnished to do so, subject to |
11 | * the following conditions: |
12 | * |
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13 | * 1. The above copyright notice and this permission notice shall be |
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14 | * included in all copies or substantial portions of the Software. |
15 | * |
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16 | * 2. If the Software is incorporated into a build system that allows |
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17 | * selection among a list of target devices, then similar target |
18 | * devices manufactured by PJRC.COM must be included in the list of |
19 | * target devices and selectable in the same manner. |
20 | * |
21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
22 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
23 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
24 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
25 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
26 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
27 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
28 | * SOFTWARE. |
29 | */ |
30 | |
31 | #include "usb_dev.h" |
32 | #include "usb_rawhid.h" |
33 | #include "core_pins.h" // for yield(), millis() |
34 | #include <string.h> // for memcpy() |
35 | //#include "HardwareSerial.h" |
36 | |
37 | #ifdef RAWHID_INTERFACE // defined by usb_dev.h -> usb_desc.h |
38 | |
39 | int usb_rawhid_recv(void *buffer, uint32_t timeout) |
40 | { |
41 | usb_packet_t *rx_packet; |
42 | uint32_t begin = millis(); |
43 | |
44 | while (1) { |
45 | if (!usb_configuration) return -1; |
46 | rx_packet = usb_rx(RAWHID_RX_ENDPOINT); |
47 | if (rx_packet) break; |
48 | if (millis() - begin > timeout || !timeout) return 0; |
49 | yield(); |
50 | } |
51 | memcpy(buffer, rx_packet->buf, RAWHID_RX_SIZE); |
52 | usb_free(rx_packet); |
53 | return RAWHID_RX_SIZE; |
54 | } |
55 | |
56 | int usb_rawhid_available(void) |
57 | { |
58 | uint32_t count; |
59 | |
60 | if (!usb_configuration) return 0; |
61 | count = usb_rx_byte_count(RAWHID_RX_ENDPOINT); |
62 | return count; |
63 | } |
64 | |
65 | // Maximum number of transmit packets to queue so we don't starve other endpoints for memory |
66 | #define TX_PACKET_LIMIT 4 |
67 | |
68 | int usb_rawhid_send(const void *buffer, uint32_t timeout) |
69 | { |
70 | usb_packet_t *tx_packet; |
71 | uint32_t begin = millis(); |
72 | |
73 | while (1) { |
74 | if (!usb_configuration) return -1; |
75 | if (usb_tx_packet_count(RAWHID_TX_ENDPOINT) < TX_PACKET_LIMIT) { |
76 | tx_packet = usb_malloc(); |
77 | if (tx_packet) break; |
78 | } |
79 | if (millis() - begin > timeout) return 0; |
80 | yield(); |
81 | } |
82 | memcpy(tx_packet->buf, buffer, RAWHID_TX_SIZE); |
83 | tx_packet->len = RAWHID_TX_SIZE; |
84 | usb_tx(RAWHID_TX_ENDPOINT, tx_packet); |
85 | return RAWHID_TX_SIZE; |
86 | } |
87 | |
88 | #endif // RAWHID_INTERFACE |