57 lines
1.9 KiB
C
57 lines
1.9 KiB
C
/* Copyright 2020 Ilya Zhuravlev
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include "protocol/usb_descriptor.h"
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#include "vial_generated_keyboard_definition.h"
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enum {
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vial_get_size = 0x01,
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vial_get_def = 0x02,
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};
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void vial_handle_cmd(uint8_t *msg, uint8_t length) {
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/* All packets must be fixed 32 bytes */
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if (length != RAW_EPSIZE)
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return;
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/* msg[0] is 0xFE -- prefix vial magic */
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switch (msg[1]) {
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/* Retrieve keyboard definition size */
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case vial_get_size: {
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uint32_t sz = sizeof(keyboard_definition);
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msg[0] = sz & 0xFF;
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msg[1] = (sz >> 8) & 0xFF;
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msg[2] = (sz >> 16) & 0xFF;
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msg[3] = (sz >> 24) & 0xFF;
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break;
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}
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/* Retrieve 32-bytes block of the definition, page ID encoded within 2 bytes */
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case vial_get_def: {
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uint32_t page = msg[2] + (msg[3] << 8);
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uint32_t start = page * RAW_EPSIZE;
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uint32_t end = start + RAW_EPSIZE;
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if (end < start || start >= sizeof(keyboard_definition))
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return;
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if (end > sizeof(keyboard_definition))
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end = sizeof(keyboard_definition);
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memcpy(msg, &keyboard_definition[start], end - start);
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break;
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}
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}
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}
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