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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019 Damien P. George
*
* 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:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* 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 "usbd_hid_interface.h"
#include "py/mpstate.h"
#include "py/mperrno.h"
#include "py/mphal.h"
#include "usb.h"
#if MICROPY_HW_USB_HID
uint8_t *usbd_hid_init(usbd_hid_state_t *hid_in) {
usbd_hid_itf_t *hid = (usbd_hid_itf_t *)hid_in;
hid->report_in_len = USBD_HID_REPORT_INVALID;
return &hid->report_in_buf[0]; // location to place first incoming report
}
int8_t usbd_hid_receive(usbd_hid_state_t *hid_in, size_t len) {
// Incoming report: save the length but don't schedule next report until user reads this one
usbd_hid_itf_t *hid = (usbd_hid_itf_t *)hid_in;
hid->report_in_len = len;
return USBD_OK;
}
int usbd_hid_rx(usbd_hid_itf_t *hid, size_t len, uint8_t *buf, uint32_t timeout_ms) {
// Wait for an incoming report
uint32_t t0 = mp_hal_ticks_ms();
while (hid->report_in_len == USBD_HID_REPORT_INVALID) {
if (mp_hal_ticks_ms() - t0 >= timeout_ms || query_irq() == IRQ_STATE_DISABLED) {
return -MP_ETIMEDOUT;
}
MICROPY_EVENT_POLL_HOOK
}
// Copy bytes from report to user buffer
int n = MIN(len, hid->report_in_len);
memcpy(buf, &hid->report_in_buf[0], n);
// Schedule to receive next incoming report
hid->report_in_len = USBD_HID_REPORT_INVALID;
USBD_HID_ReceivePacket(&hid->base, &hid->report_in_buf[0]);
// Return number of bytes read into user buffer
return n;
}
#endif // MICROPY_HW_USB_HID
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