iotbus_spi.h

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/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/

#include <stdint.h>

#ifndef IOTBUS_SPI_H_
#define IOTBUS_SPI_H_

typedef enum {
    IOTBUS_SPI_MODE0 = 0, IOTBUS_SPI_MODE1, IOTBUS_SPI_MODE2, IOTBUS_SPI_MODE3,
} iotbus_spi_mode_e;

struct iotbus_spi_config_s {
    char bits_per_word;
    int lsb; // 0 is MSB, 1 is LSB
    unsigned int chip_select;
    unsigned int frequency; // frequency in Hz
    iotbus_spi_mode_e mode;
};

struct _iotbus_spi_s;

typedef struct _iotbus_spi_s *iotbus_spi_context_h;

#ifdef __cplusplus
extern "C"
{
#endif

iotbus_spi_context_h iotbus_spi_open(unsigned int bus, const struct iotbus_spi_config_s *config);

int iotbus_spi_write(iotbus_spi_context_h hnd, uint8_t *txbuf, int length);

int iotbus_spi_recv(iotbus_spi_context_h hnd, uint8_t *rxbuf, int length);

int iotbus_spi_transfer_buf(iotbus_spi_context_h hnd, uint8_t *txbuf, uint8_t *rxbuf, int length);

int iotbus_spi_close(iotbus_spi_context_h hnd);

#ifdef __cplusplus
}
#endif

#endif /* IOTBUS_SPI_H_ */
 // end of SPI group