91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/*
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Copyright 2022, Savanni D'Gerinel <savanni@luminescent-dreams.com>
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This file is part of Savanni's AVR library.
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This AVR library 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.
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This AVR library 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.
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You should have received a copy of the GNU General Public License along with this AVR library. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef __I2C_H__
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#define __I2C_H__
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#include <dio.h>
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typedef enum i2c_bus_state {
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IDLE,
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START_SDA,
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START,
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ACTIVE_LISTEN,
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ACTIVE_IGNORE,
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INACTIVE,
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} i2c_bus_state_e;
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typedef enum message_direction {
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HOST_TO_DEVICE,
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DEVICE_TO_HOST,
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} message_direction_e;
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typedef enum {
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i2c_ok,
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i2c_arbitration_lost,
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i2c_timeout,
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i2c_nak,
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} i2c_error_e;
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typedef struct {
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bool sda_state;
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dio_t sda;
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bool scl_state;
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dio_t scl;
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} i2c_bus_t;
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typedef struct {
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dio_t sda;
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dio_t scl;
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uint8_t addr;
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i2c_bus_state_e state;
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message_direction_e direction;
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uint8_t register_count;
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int8_t target_register;
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uint8_t registers[];
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} i2c_device_t;
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i2c_bus_t * i2c_init(dio_t clock, dio_t data);
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void i2c_start(i2c_bus_t *bus, i2c_error_e *error);
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void i2c_end(i2c_bus_t *bus, i2c_error_e *error);
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void i2c_restart(i2c_bus_t *bus, i2c_error_e *error);
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void i2c_write_byte(i2c_bus_t *bus, uint8_t value, i2c_error_e *error);
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uint8_t i2c_read_byte(i2c_bus_t *bus, bool final_nak, i2c_error_e *error);
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// void i2c_host_write(i2c_host_t *, uint8_t, uint8_t, size_t, i2c_error_e);
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void i2c_status_to_string(i2c_error_e status, char msg[20]);
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i2c_device_t * i2c_device_init(dio_t clock, dio_t data, uint8_t address, uint8_t register_count);
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void i2c_device_step(i2c_device_t *);
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void i2c_device_release_bus(i2c_device_t *);
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/*
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void i2c_device_bus_state_update(i2c_device_bus_t *bus);
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void i2c_set_register(i2c_registers_t *regs, i2c_error_e *error) {
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}
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void i2c_register_write(i2c_registers_t *regs, i2c_error_e *error) {
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}
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void i2c_register_read(i2c_registers_t *regs, i2c_error_e *error) {
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}
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*/
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#endif
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