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-rw-r--r--platforms/avr/drivers/i2c_slave.h41
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diff --git a/platforms/avr/drivers/i2c_slave.h b/platforms/avr/drivers/i2c_slave.h
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+/* Copyright (C) 2019 Elia Ritterbusch
+ +
+ * 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/>.
+ */
+/* Library made by: g4lvanix
+ * GitHub repository: https://github.com/g4lvanix/I2C-slave-lib
+
+ Info: Inititate the library by giving the required address.
+ Read or write to the necessary buffer according to the opperation.
+ */
+
+#pragma once
+
+#ifndef I2C_SLAVE_REG_COUNT
+
+# if defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+# include "transport.h"
+# define I2C_SLAVE_REG_COUNT sizeof(split_shared_memory_t)
+# else // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+# define I2C_SLAVE_REG_COUNT 30
+# endif // defined(USE_I2C) && defined(SPLIT_COMMON_TRANSACTIONS)
+
+#endif // I2C_SLAVE_REG_COUNT
+
+_Static_assert(I2C_SLAVE_REG_COUNT < 256, "I2C target registers must be single byte");
+
+extern volatile uint8_t i2c_slave_reg[I2C_SLAVE_REG_COUNT];
+
+void i2c_slave_init(uint8_t address);
+void i2c_slave_stop(void);