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/* Copyright 2022 @ lokher (https://www.keychron.com)
*
* 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 "quantum.h"
#include "report_buffer.h"
#include "bluetooth.h"
#include "lpm.h"
/* The report buffer is mainly used to fix key press lost issue of macro
* when bluetooth module fifo isn't large enough. The maximun macro
* string length is determined by this queue size, and should be
* REPORT_BUFFER_QUEUE_SIZE devided by 2 since each character is implemented
* by sending a key pressing then a key releasing report.
* Please note that it cosume sizeof(report_buffer_t) * REPORT_BUFFER_QUEUE_SIZE
* bytes RAM, with default setting, used RAM size is
* sizeof(report_buffer_t) * 256 = 34* 256 = 8704 bytes
*/
#ifndef REPORT_BUFFER_QUEUE_SIZE
# define REPORT_BUFFER_QUEUE_SIZE 256
#endif
extern bluetooth_transport_t bluetooth_transport;
/* report_interval value should be less than bluetooth connection interval because
* it takes some time for communicating between mcu and bluetooth module. Carefully
* set this value to feed the bt module so that we don't lost the key report nor lost
* the anchor point of bluetooth interval. The bluetooth connection interval varies
* if BLE is used, invoke report_buffer_set_inverval() to update the value
*/
uint8_t report_interval = DEFAULT_REPORT_INVERVAL_MS;
static uint32_t report_timer_buffer = 0;
uint32_t retry_time_buffer = 0;
report_buffer_t report_buffer_queue[REPORT_BUFFER_QUEUE_SIZE];
uint8_t report_buffer_queue_head;
uint8_t report_buffer_queue_tail;
report_buffer_t kb_rpt;
uint8_t retry = 0;
void report_buffer_init(void) {
// Initialise the report queue
memset(&report_buffer_queue, 0, sizeof(report_buffer_queue));
report_buffer_queue_head = 0;
report_buffer_queue_tail = 0;
retry = 0;
report_timer_buffer = sync_timer_read32();
}
bool report_buffer_enqueue(report_buffer_t *report) {
uint8_t next = (report_buffer_queue_head + 1) % REPORT_BUFFER_QUEUE_SIZE;
if (next == report_buffer_queue_tail) {
return false;
}
report_buffer_queue[report_buffer_queue_head] = *report;
report_buffer_queue_head = next;
return true;
}
inline bool report_buffer_dequeue(report_buffer_t *report) {
if (report_buffer_queue_head == report_buffer_queue_tail) {
return false;
}
*report = report_buffer_queue[report_buffer_queue_tail];
report_buffer_queue_tail = (report_buffer_queue_tail + 1) % REPORT_BUFFER_QUEUE_SIZE;
return true;
}
bool report_buffer_is_empty() {
return report_buffer_queue_head == report_buffer_queue_tail;
}
void report_buffer_update_timer(void) {
report_timer_buffer = sync_timer_read32();
}
bool report_buffer_next_inverval(void) {
return sync_timer_elapsed32(report_timer_buffer) > report_interval;
}
void report_buffer_set_inverval(uint8_t interval) {
report_interval = interval;
}
uint8_t report_buffer_get_retry(void) {
return retry;
}
void report_buffer_set_retry(uint8_t times) {
retry = times;
}
void report_buffer_task(void) {
if (bluetooth_get_state() == BLUETOOTH_CONNECTED && (!report_buffer_is_empty() || retry) && report_buffer_next_inverval()) {
bool pending_data = false;
if (!retry) {
if (report_buffer_dequeue(&kb_rpt) && kb_rpt.type != REPORT_TYPE_NONE) {
if (sync_timer_read32() > 2) {
pending_data = true;
retry = RETPORT_RETRY_COUNT;
retry_time_buffer = sync_timer_read32();
}
}
} else {
if (sync_timer_elapsed32(retry_time_buffer) > 7) {
pending_data = true;
--retry;
retry_time_buffer = sync_timer_read32();
}
}
if (pending_data) {
#if defined(NKRO_ENABLE) && defined(BLUETOOTH_NKRO_ENABLE)
if (kb_rpt.type == REPORT_TYPE_NKRO && bluetooth_transport.send_nkro) {
bluetooth_transport.send_nkro(&kb_rpt.keyboard.nkro.mods);
} else if (kb_rpt.type == REPORT_TYPE_KB && bluetooth_transport.send_keyboard)
bluetooth_transport.send_keyboard(&kb_rpt.keyboard.mods);
#else
if (kb_rpt.type == REPORT_TYPE_KB && bluetooth_transport.send_keyboard) bluetooth_transport.send_keyboard(&kb_rpt.keyboard.mods);
#endif
if (kb_rpt.type == REPORT_TYPE_CONSUMER && bluetooth_transport.send_consumer) bluetooth_transport.send_consumer(kb_rpt.consumer);
report_timer_buffer = sync_timer_read32();
lpm_timer_reset();
}
}
}
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