Mbed OS Reference | pn512_hw.h Source File

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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_ */
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