mirror of
https://github.com/mofeng-git/One-KVM.git
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81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
/*****************************************************************************
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# #
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# KVMD - The main PiKVM daemon. #
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# #
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# Copyright (C) 2018-2022 Maxim Devaev <mdevaev@gmail.com> #
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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 3 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 <https://www.gnu.org/licenses/>. #
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# #
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*****************************************************************************/
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#include "spi.h"
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static volatile uint8_t _spi_in[8] = {0};
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static volatile uint8_t _spi_in_index = 0;
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static volatile uint8_t _spi_out[8] = {0};
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static volatile uint8_t _spi_out_index = 0;
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void spiBegin() {
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pinMode(MISO, OUTPUT);
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SPCR = (1 << SPE) | (1 << SPIE); // Slave, SPI En, IRQ En
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}
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bool spiReady() {
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return (!_spi_out[0] && _spi_in_index == 8);
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}
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const uint8_t *spiGet() {
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return (const uint8_t *)_spi_in;
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}
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void spiWrite(const uint8_t *data) {
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// Меджик в нулевом байте разрешает начать ответ
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for (int index = 7; index >= 0; --index) {
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_spi_out[index] = data[index];
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}
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}
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ISR(SPI_STC_vect) {
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uint8_t in = SPDR;
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if (_spi_out[0] && _spi_out_index < 8) {
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SPDR = _spi_out[_spi_out_index];
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if (!(SPSR & (1 << WCOL))) {
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++_spi_out_index;
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if (_spi_out_index == 8) {
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_spi_out_index = 0;
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_spi_in_index = 0;
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_spi_out[0] = 0;
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}
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}
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} else {
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static bool receiving = false;
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if (!receiving && in != 0) {
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receiving = true;
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}
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if (receiving && _spi_in_index < 8) {
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_spi_in[_spi_in_index] = in;
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++_spi_in_index;
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}
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if (_spi_in_index == 8) {
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receiving = false;
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}
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SPDR = 0;
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}
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}
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