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/*
* Copyright 2017 Ettus Research, a National Instruments Company
*
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include <stdint.h>
/*! Initialize a spidev interface
*
* \param fd Return value of the file descriptor
* \param device Path of spidev device, e.g. "/dev/spidev0.0"
* \param mode SPI mode. See linux/spi/spidev.h
* \param speed_hz The *maximum* SPI speed in Hz
* \param bits_per_word Just set it to 8.
* \param delay_us Delay between writes in microseconds
*
* \returns 0 if all is good, or an error code otherwise
*/
int init_spi(int *fd, const char *device,
const uint32_t mode,
const uint32_t speed_hz,
const uint8_t bits_per_word,
const uint16_t delay_us
);
/*! Do a SPI transaction over spidev
*
* \param tx Buffer of data to be written
* \param rx Must match tx buffer length; result will be written here
* \param len Total number of bytes in this transaction
* \param speed_hz Speed of this transaction in Hz
* \param bits_per_word 8, dude
* \param delay_us Delay between transfers
*
* Assumption: spidev was configured properly beforehand.
*
* \returns 0 if all is golden
*/
int transfer(
int fd,
uint8_t *tx, uint8_t *rx, uint32_t len,
uint32_t speed_hz, uint8_t bits_per_word, uint16_t delay_us
);
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