owner-nrf52sdk/nRF5_SDK_15.2.0/components/drivers_ext/max9850/max9850.c

/**
 * Copyright (c) 2016 - 2018, Nordic Semiconductor ASA
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
 *
 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 *
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 */
#include "max9850.h"

#include <string.h>

ret_code_t max9850_init(max9850_config_t const * p_max9850)
{
    ret_code_t ret = NRF_SUCCESS;

    ret = nrf_drv_twi_init(&p_max9850->twi, &p_max9850->twi_cfg, NULL, NULL);
    if (ret != NRF_SUCCESS)
    {
        return ret;
    }

    nrf_drv_twi_enable(&p_max9850->twi);

    /*Probe device*/
    uint8_t rx[] = {0};
    ret = nrf_drv_twi_rx(&p_max9850->twi, p_max9850->twi_addr, rx, sizeof(rx));
    if (ret != NRF_SUCCESS)
    {
        return ret;
    }

    uint8_t regs[sizeof(max9850_regmap_t) + 1];

    regs[0] = 0x00;
    memcpy(regs + 1, &p_max9850->regmap, sizeof(max9850_regmap_t));

    /*Write configuration*/
    return nrf_drv_twi_tx(&p_max9850->twi, p_max9850->twi_addr, regs, sizeof(regs), false);
}