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58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/*
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* Copyright 2018 Ettus Research, a National Instruments Company
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*
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#ifndef _I2CDEV_H_FOUND_
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#define _I2CDEV_H_FOUND_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include <stddef.h>
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/*
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* This API provides access to i2c devices. It uses the character device API
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* from the Linux kernel and i2c-tools
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*
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* The kernel documentation can be found at
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* https://www.kernel.org/doc/Documentation/i2c/dev-interface
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*/
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/*! Initialize a i2cdev interface
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*
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* \param fd Return value of the file descriptor
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* \param device Path of i2cdev device, e.g. "/dev/i2c0"
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* \param timeout_ms Timeout to wait for ACK in ms
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*
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* \returns 0 if all is good, or an error code otherwise
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*/
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int i2cdev_open(int *fd, const char *device, const unsigned int timeout_ms);
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/*! Do an i2c transaction over i2cdev
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* If both tx and rx are to be done in one transaction, first tx data is
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* transmitted, followed by a repeated start condition, then the rx data is
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* read.
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*
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* \param fd File descriptor for the i2cdev bus segment
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* \param addr i2c device address
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* \param ten_bit_addr Nonzero if true (typically 0)
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* \param tx Buffer of data to be written to device
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* \param tx_len Total number of non-addr bytes to be written
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* \param rx Buffer where read data can be stored
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* \param rx_len Total number of bytes to be read
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*
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* Assumption: spidev was configured properly beforehand.
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*
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* \returns 0 if all is golden
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*/
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int i2cdev_transfer(int fd, uint16_t addr, int ten_bit_addr,
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uint8_t *tx, size_t tx_len,
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uint8_t *rx, size_t rx_len);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _I2CDEV_H_FOUND_ */
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