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  1. /* Teensyduino Core Library
  2. * http://www.pjrc.com/teensy/
  3. * Copyright (c) 2017 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. *
  13. * 1. The above copyright notice and this permission notice shall be
  14. * included in all copies or substantial portions of the Software.
  15. *
  16. * 2. If the Software is incorporated into a build system that allows
  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. #include "usb_dev.h"
  31. #include "usb_rawhid.h"
  32. #include "core_pins.h" // for yield(), millis()
  33. #include <string.h> // for memcpy()
  34. //#include "HardwareSerial.h"
  35. #ifdef RAWHID_INTERFACE // defined by usb_dev.h -> usb_desc.h
  36. #if F_CPU >= 20000000
  37. int usb_rawhid_recv(void *buffer, uint32_t timeout)
  38. {
  39. usb_packet_t *rx_packet;
  40. uint32_t begin = millis();
  41. while (1) {
  42. if (!usb_configuration) return -1;
  43. rx_packet = usb_rx(RAWHID_RX_ENDPOINT);
  44. if (rx_packet) break;
  45. if (millis() - begin > timeout || !timeout) return 0;
  46. yield();
  47. }
  48. memcpy(buffer, rx_packet->buf, RAWHID_RX_SIZE);
  49. usb_free(rx_packet);
  50. return RAWHID_RX_SIZE;
  51. }
  52. int usb_rawhid_available(void)
  53. {
  54. uint32_t count;
  55. if (!usb_configuration) return 0;
  56. count = usb_rx_byte_count(RAWHID_RX_ENDPOINT);
  57. return count;
  58. }
  59. // Maximum number of transmit packets to queue so we don't starve other endpoints for memory
  60. #define TX_PACKET_LIMIT 4
  61. int usb_rawhid_send(const void *buffer, uint32_t timeout)
  62. {
  63. usb_packet_t *tx_packet;
  64. uint32_t begin = millis();
  65. while (1) {
  66. if (!usb_configuration) return -1;
  67. if (usb_tx_packet_count(RAWHID_TX_ENDPOINT) < TX_PACKET_LIMIT) {
  68. tx_packet = usb_malloc();
  69. if (tx_packet) break;
  70. }
  71. if (millis() - begin > timeout) return 0;
  72. yield();
  73. }
  74. memcpy(tx_packet->buf, buffer, RAWHID_TX_SIZE);
  75. tx_packet->len = RAWHID_TX_SIZE;
  76. usb_tx(RAWHID_TX_ENDPOINT, tx_packet);
  77. return RAWHID_TX_SIZE;
  78. }
  79. #endif // F_CPU
  80. #endif // RAWHID_INTERFACE