spi.hpp

/*
 * Author: Brendan Le Foll <brendan.le.foll@intel.com>
 * Copyright (c) 2014 Intel Corporation.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#pragma once

#include "spi.h"
#include <stdexcept>

namespace mraa {

typedef enum {
    SPI_MODE0 = 0, 
    SPI_MODE1 = 1, 
    SPI_MODE2 = 2, 
    SPI_MODE3 = 3, 
} Spi_Mode;


class Spi {
    public:
        Spi(int bus) {
            m_spi = mraa_spi_init(bus);

            if (m_spi == NULL) {
                throw std::invalid_argument("Error initialising SPI bus");
            }
        }

        ~Spi() {
            mraa_spi_stop(m_spi);
        }

        mraa_result_t mode(Spi_Mode mode) {
            return mraa_spi_mode(m_spi, (mraa_spi_mode_t) mode);
        }

        mraa_result_t frequency(int hz) {
            return mraa_spi_frequency(m_spi, hz);
        }

        uint8_t writeByte(uint8_t data) {
            return mraa_spi_write(m_spi, (uint8_t) data);
        }

        uint8_t* write(uint8_t* txBuf, int length) {
            return mraa_spi_write_buf(m_spi, txBuf, length);
        }

#ifndef SWIG

        mraa_result_t transfer(uint8_t* txBuf, uint8_t* rxBuf, int length) {
            return mraa_spi_transfer_buf(m_spi, txBuf, rxBuf, length);
        }
#endif

        mraa_result_t lsbmode(bool lsb) {
            return mraa_spi_lsbmode(m_spi, (mraa_boolean_t) lsb);
        }

        mraa_result_t bitPerWord(unsigned int bits) {
            return mraa_spi_bit_per_word(m_spi, bits);
        }

    private:
        mraa_spi_context m_spi;
};
}