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88 lines
3.9 KiB
C
88 lines
3.9 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2013-2024 OpenMV, LLC.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* I2C bus abstraction layer.
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*/
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#ifndef __OMV_I2C_H__
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#define __OMV_I2C_H__
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#include <stdint.h>
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#include <stdbool.h>
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#include "omv_portconfig.h"
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// Transfer speeds
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typedef enum _omv_i2c_speed {
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OMV_I2C_SPEED_STANDARD = (0U),
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OMV_I2C_SPEED_FULL = (1U),
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OMV_I2C_SPEED_FAST = (2U),
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OMV_I2C_SPEED_MAX = (3U)
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} omv_i2c_speed_t;
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// For use with read/write_bytes
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typedef enum omv_i2c_xfer_flags {
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// Stop condition after the transfer.
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// Normal transfer with start condition, address, data and stop condition.
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OMV_I2C_XFER_NO_FLAGS = (1 << 0),
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// No stop condition after the transfer.
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// This flag allows the next transfer to change direction with repeated start.
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OMV_I2C_XFER_NO_STOP = (1 << 1),
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// No stop condition after the transfer.
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// This flag allows chaining multiple writes or reads with the same direction.
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OMV_I2C_XFER_SUSPEND = (1 << 2),
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// Generate a restart before the transfer.
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// This flag generates a re-start condition before transfering the next byte.
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OMV_I2C_XFER_RESTART = (1 << 3),
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} omv_i2c_xfer_flags_t;
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typedef struct _omv_i2c {
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uint32_t id;
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uint32_t speed;
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uint32_t initialized;
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omv_gpio_t scl_pin;
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omv_gpio_t sda_pin;
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omv_i2c_dev_t inst;
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#ifdef OMV_I2C_PORT_BITS
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// Additional port-specific fields like device base pointer,
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// dma handles, more I/Os etc... are included directly here,
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// so that they can be accessible from this struct.
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OMV_I2C_PORT_BITS
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#endif
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} omv_i2c_t;
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int omv_i2c_init(omv_i2c_t *i2c, uint32_t bus_id, uint32_t speed);
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int omv_i2c_deinit(omv_i2c_t *i2c);
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int omv_i2c_scan(omv_i2c_t *i2c, uint8_t *list, uint8_t size);
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int omv_i2c_enable(omv_i2c_t *i2c, bool enable);
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int omv_i2c_gencall(omv_i2c_t *i2c, uint8_t cmd);
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int omv_i2c_pulse_scl(omv_i2c_t *i2c);
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int omv_i2c_readb(omv_i2c_t *i2c, uint8_t slv_addr, uint8_t reg_addr, uint8_t *reg_data);
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int omv_i2c_writeb(omv_i2c_t *i2c, uint8_t slv_addr, uint8_t reg_addr, uint8_t reg_data);
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int omv_i2c_readb2(omv_i2c_t *i2c, uint8_t slv_addr, uint16_t reg_addr, uint8_t *reg_data);
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int omv_i2c_writeb2(omv_i2c_t *i2c, uint8_t slv_addr, uint16_t reg_addr, uint8_t reg_data);
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int omv_i2c_readw(omv_i2c_t *i2c, uint8_t slv_addr, uint8_t reg_addr, uint16_t *reg_data);
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int omv_i2c_writew(omv_i2c_t *i2c, uint8_t slv_addr, uint8_t reg_addr, uint16_t reg_data);
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int omv_i2c_readw2(omv_i2c_t *i2c, uint8_t slv_addr, uint16_t reg_addr, uint16_t *reg_data);
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int omv_i2c_writew2(omv_i2c_t *i2c, uint8_t slv_addr, uint16_t reg_addr, uint16_t reg_data);
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int omv_i2c_read_bytes(omv_i2c_t *i2c, uint8_t slv_addr, uint8_t *buf, int len, uint32_t flags);
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int omv_i2c_write_bytes(omv_i2c_t *i2c, uint8_t slv_addr, uint8_t *buf, int len, uint32_t flags);
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#endif // __OMV_I2C_H__
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