1 files changed, 83 insertions, 0 deletions
diff --git a/hid/lib/drivers-avr/spi.cpp b/hid/lib/drivers-avr/spi.cpp
new file mode 100644
index 00000000..e2b56928
--- /dev/null
+++ b/hid/lib/drivers-avr/spi.cpp
@@ -0,0 +1,83 @@
+/*****************************************************************************
+#                                                                            #
+#    KVMD - The main PiKVM daemon.                                           #
+#                                                                            #
+#    Copyright (C) 2018-2022  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 "spi.h"
+
+#include <Arduino.h>
+#include <SPI.h>
+
+
+static volatile uint8_t _spi_in[8] = {0};
+static volatile uint8_t _spi_in_index = 0;
+
+static volatile uint8_t _spi_out[8] = {0};
+static volatile uint8_t _spi_out_index = 0;
+
+
+void spiBegin() {
+	pinMode(MISO, OUTPUT);
+	SPCR = (1 << SPE) | (1 << SPIE); // Slave, SPI En, IRQ En
+}
+
+bool spiReady() {
+	return (!_spi_out[0] && _spi_in_index == 8);
+}
+
+const uint8_t *spiGet() {
+	return (const uint8_t *)_spi_in;
+}
+
+void spiWrite(const uint8_t *data) {
+	// Меджик в нулевом байте разрешает начать ответ
+	for (int index = 7; index >= 0; --index) {
+		_spi_out[index] = data[index];
+	}
+}
+
+
+ISR(SPI_STC_vect) {
+	uint8_t in = SPDR;
+	if (_spi_out[0] && _spi_out_index < 8) {
+		SPDR = _spi_out[_spi_out_index];
+		if (!(SPSR & (1 << WCOL))) {
+			++_spi_out_index;
+			if (_spi_out_index == 8) {
+				_spi_out_index = 0;
+				_spi_in_index = 0;
+				_spi_out[0] = 0;
+			}
+		}
+	} else {
+		static bool receiving = false;
+		if (!receiving && in != 0) {
+			receiving = true;
+		}
+		if (receiving && _spi_in_index < 8) {
+			_spi_in[_spi_in_index] = in;
+			++_spi_in_index;
+		}
+		if (_spi_in_index == 8) {
+			receiving = false;
+		}
+		SPDR = 0;
+	}
+}