pn512_hw.h

00001 /*
00002  * Copyright (c) 2013-2018, ARM Limited, All Rights Reserved
00003  * SPDX-License-Identifier: Apache-2.0
00004  *
00005  * Licensed under the Apache License, Version 2.0 (the "License"); you may
00006  * not use this file except in compliance with the License.
00007  * You may obtain a copy of the License at
00008  *
00009  * http://www.apache.org/licenses/LICENSE-2.0
00010  *
00011  * Unless required by applicable law or agreed to in writing, software
00012  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
00013  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  * See the License for the specific language governing permissions and
00015  * limitations under the License.
00016  */
00017 /**
00018  * \file pn512_hw.h
00019  * \copyright Copyright (c) ARM Ltd 2013
00020  * \author Donatien Garnier
00021  */
00022 
00023 #ifndef PN512_HW_H_
00024 #define PN512_HW_H_
00025 
00026 #ifdef __cplusplus
00027 extern "C" {
00028 #endif
00029 
00030 #include "stack/nfc_common.h"
00031 #include "pn512.h"
00032 
00033 //Utility for transport: SPI address read/write
00034 #define PN512_SPI_ADDR_R(x) ((1<<7) | ((x) << 1))
00035 #define PN512_SPI_ADDR_W(x) ((0<<7) | ((x) << 1))
00036 
00037 void pn512_hw_init(pn512_t *pPN512);
00038 
00039 /** \internal Write bytes at the specified address on the underlying transport link
00040  * \param pPN512 pointer to pn512_t structure
00041  * \param addr address at which to write
00042  * \param buf buffer to write
00043  * \param len length of buffer
00044  */
00045 static inline void pn512_hw_write(pn512_t *pPN512, uint8_t addr, uint8_t *buf, size_t len)
00046 {
00047     nfc_transport_write(((nfc_transceiver_t *)pPN512)->pTransport, addr, buf, len);
00048 }
00049 
00050 /** \internal Read bytes from the specified address on the underlying transport link
00051  * \param pPN512 pointer to pn512_t structure
00052  * \param addr address from which to read
00053  * \param buf buffer to read
00054  * \param len length of buffer
00055  */
00056 static inline void pn512_hw_read(pn512_t *pPN512, uint8_t addr, uint8_t *buf, size_t len)
00057 {
00058     nfc_transport_read(((nfc_transceiver_t *)pPN512)->pTransport, addr, buf, len);
00059 }
00060 
00061 static inline void pn512_hw_write_buffer(pn512_t *pPN512, uint8_t addr, ac_buffer_t *pData, size_t len)
00062 {
00063     while (len > 0) {
00064         if (ac_buffer_reader_readable(pData) == 0) {
00065             return;
00066         }
00067         size_t cpyLen = MIN(len, ac_buffer_reader_current_buffer_length(pData));
00068         nfc_transport_write(((nfc_transceiver_t *)pPN512)->pTransport, addr, ac_buffer_reader_current_buffer_pointer(pData), cpyLen);
00069         ac_buffer_read_n_skip(pData, cpyLen);
00070         len -= cpyLen;
00071     }
00072 }
00073 
00074 static inline void pn512_hw_read_buffer(pn512_t *pPN512, uint8_t addr, ac_buffer_builder_t *pData, size_t len)
00075 {
00076     while (len > 0) {
00077         if (ac_buffer_builder_writable(pData) == 0) {
00078             return;
00079         }
00080         //Read payload
00081         size_t cpyLen = MIN(len, ac_buffer_builder_space(pData));
00082         nfc_transport_read(((nfc_transceiver_t *)pPN512)->pTransport, addr, ac_buffer_builder_write_position(pData), cpyLen);
00083         ac_buffer_builder_write_n_skip(pData, cpyLen);
00084         len -= cpyLen;
00085     }
00086 }
00087 
00088 #ifdef __cplusplus
00089 }
00090 #endif
00091 
00092 #endif /* PN512_HW_H_ */