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/*****************************************************************************
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2023 Maxim Devaev <[email protected]> #
# #
# 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 3 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 <https://www.gnu.org/licenses/>. #
# #
*****************************************************************************/
#include "ph_com_uart.h"
#include "pico/stdlib.h"
#include "hardware/gpio.h"
#include "hardware/uart.h"
#include "ph_types.h"
#define _BUS uart1
#define _SPEED 115200
#define _RX_PIN 21
#define _TX_PIN 20
#define _TIMEOUT_US 100000
static u8 _buf[8] = {0};
static u8 _index = 0;
static u64 _last_ts = 0;
static void (*_data_cb)(const u8 *) = NULL;
static void (*_timeout_cb)(void) = NULL;
void ph_com_uart_init(void (*data_cb)(const u8 *), void (*timeout_cb)(void)) {
_data_cb = data_cb;
_timeout_cb = timeout_cb;
uart_init(_BUS, _SPEED);
gpio_set_function(_RX_PIN, GPIO_FUNC_UART);
gpio_set_function(_TX_PIN, GPIO_FUNC_UART);
}
void ph_com_uart_task(void) {
if (uart_is_readable(_BUS)) {
_buf[_index] = (u8)uart_getc(_BUS);
if (_index == 7) {
_data_cb(_buf);
_index = 0;
} else {
_last_ts = time_us_64();
++_index;
}
} else if (_index > 0) {
if (_last_ts + _TIMEOUT_US < time_us_64()) {
_timeout_cb();
_index = 0;
}
}
}
void ph_com_uart_write(const u8 *data) {
uart_write_blocking(_BUS, data, 8);
}
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