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/*
* This file is part of the libopencm3_cpp_extensions project.
* hosted at http://github.com/thirdpin/libopencm3_cpp_extensions
*
* Copyright (C) 2016 Third Pin LLC
* Written by Anastasiia Lazareva <a.lazareva@thirdpin.ru>
*
* 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 <http://www.gnu.org/licenses/>.
*/
/*
RS485 implementation, public interface
*/
#include "rs485.hpp"
namespace cm3cpp {
RS485::RS485(Struct rs485,
Settings settings,
utils::RoundBuffer rb_in_size,
utils::RoundBuffer rb_out_size) :
_de(rs485.de)
{
rb_in = new utils::RoundBuffer(rb_in_size);
rb_out = new utils::RoundBuffer(rb_out_size);
if (rs485.rx.pin) {
Gpio rx(rs485.rx);
rx.mode_setup(Gpio::Mode::ALTERNATE_FUNCTION, Gpio::PullMode::NO_PULL);
rx.set_output_options(Gpio::OutputType::PUSH_PULL,
Gpio::Speed::MEDIUM_25MHz);
rx.set_af(Gpio::AltFuncNumber::AF7);
}
if (rs485.tx.pin) {
Gpio tx(rs485.tx);
tx.mode_setup(Gpio::Mode::ALTERNATE_FUNCTION, Gpio::PullMode::NO_PULL);
tx.set_output_options(Gpio::OutputType::PUSH_PULL,
Gpio::Speed::MEDIUM_25MHz);
tx.set_af(Gpio::AltFuncNumber::AF7);
}
_de.mode_setup(Gpio::Mode::OUTPUT, Gpio::PullMode::NO_PULL);
_de.set_output_options(Gpio::OutputType::PUSH_PULL,
Gpio::Speed::MEDIUM_25MHz);
_de.clear();
switch (rs485.number) {
case 1:
_rs485 = USART1;
nvic_enable_irq(NVIC_USART1_IRQ);
break;
case 2:
_rs485 = USART2;
nvic_enable_irq(NVIC_USART2_IRQ);
break;
case 3:
_rs485 = USART3;
nvic_enable_irq(NVIC_USART3_IRQ);
break;
}
usart_set_baudrate(_rs485, settings.baud_rate);
usart_set_databits(_rs485, settings.word_length);
usart_set_stopbits(_rs485, settings.stop_bits);
usart_set_mode(_rs485, settings.mode);
usart_set_parity(_rs485, settings.parity);
usart_set_flow_control(_rs485, settings.flow_control);
if (settings.mode & USART_MODE_RX)
usart_enable_rx_interrupt(_rs485);
usart_enable(_rs485);
}
} // namespace cm3cpp
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