pn512_hw.h

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/*
 * Copyright (c) 2013-2018, ARM Limited, All Rights Reserved
 * SPDX-License-Identifier: Apache-2.0
 *
 * 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.
 */
/**
 * \file pn512_hw.h
 * \copyright Copyright (c) ARM Ltd 2013
 * \author Donatien Garnier
 */
 
#ifndef PN512_HW_H_
#define PN512_HW_H_
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include "stack/nfc_common.h"
#include "pn512.h"
 
//Utility for transport: SPI address read/write
#define PN512_SPI_ADDR_R(x) ((1<<7) | ((x) << 1))
#define PN512_SPI_ADDR_W(x) ((0<<7) | ((x) << 1))
 
void pn512_hw_init(pn512_t *pPN512);
 
/** \internal Write bytes at the specified address on the underlying transport link
 * \param pPN512 pointer to pn512_t structure
 * \param addr address at which to write
 * \param buf buffer to write
 * \param len length of buffer
 */
static inline void pn512_hw_write(pn512_t *pPN512, uint8_t addr, uint8_t *buf, size_t len)
{
    nfc_transport_write(((nfc_transceiver_t *)pPN512)->pTransport, addr, buf, len);
}
 
/** \internal Read bytes from the specified address on the underlying transport link
 * \param pPN512 pointer to pn512_t structure
 * \param addr address from which to read
 * \param buf buffer to read
 * \param len length of buffer
 */
static inline void pn512_hw_read(pn512_t *pPN512, uint8_t addr, uint8_t *buf, size_t len)
{
    nfc_transport_read(((nfc_transceiver_t *)pPN512)->pTransport, addr, buf, len);
}
 
static inline void pn512_hw_write_buffer(pn512_t *pPN512, uint8_t addr, ac_buffer_t *pData, size_t len)
{
    while (len > 0) {
        if (ac_buffer_reader_readable(pData) == 0) {
            return;
        }
        size_t cpyLen = MIN(len, ac_buffer_reader_current_buffer_length(pData));
        nfc_transport_write(((nfc_transceiver_t *)pPN512)->pTransport, addr, ac_buffer_reader_current_buffer_pointer(pData), cpyLen);
        ac_buffer_read_n_skip(pData, cpyLen);
        len -= cpyLen;
    }
}
 
static inline void pn512_hw_read_buffer(pn512_t *pPN512, uint8_t addr, ac_buffer_builder_t *pData, size_t len)
{
    while (len > 0) {
        if (ac_buffer_builder_writable(pData) == 0) {
            return;
        }
        //Read payload
        size_t cpyLen = MIN(len, ac_buffer_builder_space(pData));
        nfc_transport_read(((nfc_transceiver_t *)pPN512)->pTransport, addr, ac_buffer_builder_write_position(pData), cpyLen);
        ac_buffer_builder_write_n_skip(pData, cpyLen);
        len -= cpyLen;
    }
}
 
#ifdef __cplusplus
}
#endif
 
#endif /* PN512_HW_H_ */