72 lines
2.6 KiB
C
72 lines
2.6 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2019 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "usbd_hid_interface.h"
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#include "py/mpstate.h"
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#include "py/mperrno.h"
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#include "py/mphal.h"
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#include "usb.h"
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#if MICROPY_HW_USB_HID
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uint8_t *usbd_hid_init(usbd_hid_state_t *hid_in) {
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usbd_hid_itf_t *hid = (usbd_hid_itf_t*)hid_in;
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hid->report_in_len = USBD_HID_REPORT_INVALID;
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return &hid->report_in_buf[0]; // location to place first incoming report
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}
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int8_t usbd_hid_receive(usbd_hid_state_t *hid_in, size_t len) {
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// Incoming report: save the length but don't schedule next report until user reads this one
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usbd_hid_itf_t *hid = (usbd_hid_itf_t*)hid_in;
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hid->report_in_len = len;
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return USBD_OK;
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}
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int usbd_hid_rx(usbd_hid_itf_t *hid, size_t len, uint8_t *buf, uint32_t timeout_ms) {
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// Wait for an incoming report
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uint32_t t0 = mp_hal_ticks_ms();
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while (hid->report_in_len == USBD_HID_REPORT_INVALID) {
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if (mp_hal_ticks_ms() - t0 >= timeout_ms || query_irq() == IRQ_STATE_DISABLED) {
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return -MP_ETIMEDOUT;
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}
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MICROPY_EVENT_POLL_HOOK
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}
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// Copy bytes from report to user buffer
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int n = MIN(len, hid->report_in_len);
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memcpy(buf, &hid->report_in_buf[0], n);
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// Schedule to receive next incoming report
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hid->report_in_len = USBD_HID_REPORT_INVALID;
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USBD_HID_ReceivePacket(&hid->base, &hid->report_in_buf[0]);
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// Return number of bytes read into user buffer
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return n;
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}
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#endif // MICROPY_HW_USB_HID
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