keyboard/qmk/keyboards/nullbitsco/tidbit/remote_kb.c

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/* Copyright 2020 Jay Greco
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "remote_kb.h"
//todo: remove master/slave
uint8_t
msg[UART_MSG_LEN],
msg_idx = 0;
bool
is_master = true;
bool vbus_detect(void) {
//returns true if VBUS is present, false otherwise.
USBCON |= (1 << OTGPADE); //enables VBUS pad
_delay_us(10);
return (USBSTA & (1<<VBUS)); //checks state of VBUS
}
uint8_t chksum8(const unsigned char *buf, size_t len) {
unsigned int sum;
for (sum = 0 ; len != 0 ; len--)
sum += *(buf++);
return (uint8_t)sum;
}
void send_msg(uint16_t keycode, bool pressed) {
msg[IDX_PREAMBLE] = UART_PREAMBLE;
msg[IDX_KCLSB] = (keycode & 0xFF);
msg[IDX_KCMSB] = (keycode >> 8) & 0xFF;
msg[IDX_PRESSED] = pressed;
msg[IDX_CHECKSUM] = chksum8(msg, UART_MSG_LEN-1);
for (int i=0; i<UART_MSG_LEN; i++) {
uart_putchar(msg[i]);
}
}
void get_msg(void) {
while (uart_available()) {
msg[msg_idx] = uart_getchar();
dprintf("idx: %u, recv: %u\n", msg_idx, msg[msg_idx]);
if (msg_idx == 0 && (msg[msg_idx] != UART_PREAMBLE)) {
dprintf("Byte sync error!\n");
msg_idx = 0;
} else if (msg_idx == (UART_MSG_LEN-1)) {
process_uart();
msg_idx = 0;
} else {
msg_idx++;
}
}
}
void _print_message_buffer(void) {
for (int i=0; i<UART_MSG_LEN; i++) {
dprintf("msg[%u]: %u\n", i, msg[i]);
}
}
void process_uart(void) {
uint8_t chksum = chksum8(msg, UART_MSG_LEN-1);
if (msg[IDX_PREAMBLE] != UART_PREAMBLE || msg[IDX_CHECKSUM] != chksum) {
dprintf("UART checksum mismatch!\n");
_print_message_buffer();
dprintf("calc checksum: %u\n", chksum);
} else {
uint16_t keycode = (uint16_t)msg[IDX_KCLSB] | ((uint16_t)msg[IDX_KCMSB] << 8);
bool pressed = (bool)msg[IDX_PRESSED];
if (IS_RM_KC(keycode)) {
keyrecord_t record;
record.event.pressed = pressed;
if (pressed) dprintf("Remote macro: press [%u]\n", keycode);
else dprintf("Remote macro: release [%u]\n", keycode);
process_record_user(keycode, &record);
} else {
if (pressed) {
dprintf("Remote: press [%u]\n", keycode);
register_code(keycode);
} else {
dprintf("Remote: release [%u]\n", keycode);
unregister_code(keycode);
}
}
}
}
void matrix_init_remote_kb(void) {
uart_init(SERIAL_UART_BAUD);
is_master = vbus_detect();
}
//todo: unify with send/recv functions
void process_record_remote_kb(uint16_t keycode, keyrecord_t *record) {
#if defined (KEYBOARD_MASTER)
// for future reverse link use
#elif defined(KEYBOARD_SLAVE)
if (IS_HID_KC(keycode) || IS_RM_KC(keycode)) {
dprintf("Remote: send [%u]\n", keycode);
send_msg(keycode, record->event.pressed);
}
#else //auto check with VBUS
if (is_master) {
// for future reverse link use
}
else {
if (IS_HID_KC(keycode) || IS_RM_KC(keycode)) {
dprintf("Remote: send [%u]\n", keycode);
send_msg(keycode, record->event.pressed);
}
}
#endif
}
void matrix_scan_remote_kb(void) {
#if defined(KEYBOARD_MASTER)
get_msg();
#elif defined (KEYBOARD_SLAVE)
// for future reverse link use
#else //auto check with VBUS
if (is_master) {
get_msg();
}
else {
// for future reverse link use
}
#endif
}