mirror of https://github.com/ARMmbed/mbed-os.git
149 lines
3.8 KiB
C
149 lines
3.8 KiB
C
/*
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* Copyright (c) 2013-2018, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* \file pn512_cmd.c
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* \copyright Copyright (c) ARM Ltd 2013
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* \author Donatien Garnier
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* \details Format and execute PN512 commands
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* \internal
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*/
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#define __DEBUG__ 0
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#ifndef __MODULE__
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#define __MODULE__ "pn512_cmd.c"
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#endif
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#include "stack/nfc_errors.h"
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#include "pn512_cmd.h"
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#define PN512_FIFO_SIZE 64
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#include "pn512.h"
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#include "pn512_registers.h"
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#include "pn512_irq.h"
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#include "pn512_hw.h"
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/** \addtogroup PN512
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* \internal
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* @{
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* \name Commands
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* @{
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*/
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/** \internal Initialize underlying pn512_cmd_t structure
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* \param pPN512 pointer to pn512_t structure
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*/
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void pn512_cmd_init(pn512_t *pPN512)
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{
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(void) pPN512;
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}
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//Fifo read / write
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/** \internal Write bytes to FIFO
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* \param pPN512 pointer to pn512_t structure
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* \param pData buffer to write
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*/
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void pn512_fifo_write(pn512_t *pPN512, ac_buffer_t *pData)
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{
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uint8_t fifo_space = pn512_fifo_space(pPN512); //Do not call this fn twice
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size_t len = ac_buffer_reader_readable(pData);
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len = MIN(fifo_space, len);
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pn512_register_switch_page(pPN512, PN512_REG_FIFODATA);
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pn512_hw_write_buffer(pPN512, PN512_REG_FIFODATA, pData, len);
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}
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/** \internal Read bytes from FIFO
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* \param pPN512 pointer to pn512_t structure
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* \param pData buffer in which to read
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*/
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void pn512_fifo_read(pn512_t *pPN512, ac_buffer_builder_t *pData)
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{
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uint8_t fifo_len = pn512_fifo_length(pPN512); //Do not call this fn twice
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size_t len = ac_buffer_builder_writable(pData);
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len = MIN(fifo_len, len);
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pn512_register_switch_page(pPN512, PN512_REG_FIFODATA);
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pn512_hw_read_buffer(pPN512, PN512_REG_FIFODATA, pData, len);
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}
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/** \internal Clear FIFO
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* Removes any bytes left in FIFO
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* \param pPN512 pointer to pn512_t structure
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*/
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void pn512_fifo_clear(pn512_t *pPN512)
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{
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pn512_register_write(pPN512, PN512_REG_FIFOLEVEL, 0x80); //Flush FIFO
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}
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/** \internal Get space in FIFO
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* \param pPN512 pointer to pn512_t structure
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* \return number of bytes that can be written to FIFO
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*/
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size_t pn512_fifo_space(pn512_t *pPN512)
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{
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return PN512_FIFO_SIZE - pn512_register_read(pPN512, PN512_REG_FIFOLEVEL);
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}
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/** \internal Get FIFO length
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* \param pPN512 pointer to pn512_t structure
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* \return number of bytes that can be read from FIFO
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*/
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size_t pn512_fifo_length(pn512_t *pPN512)
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{
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return pn512_register_read(pPN512, PN512_REG_FIFOLEVEL);
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}
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/** \internal Execute command
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* \param pPN512 pointer to pn512_t structure
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* \param cmd PN512 command to execute
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*/
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void pn512_cmd_exec(pn512_t *pPN512, uint8_t cmd)
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{
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pn512_register_write(pPN512, PN512_REG_COMMAND, cmd);
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}
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/** \internal Wait for command completion
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* \param pPN512 pointer to pn512_t structure
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* \param timeout timeout in milliseconds or -1 for blocking mode
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* \return NFC_OK on success or NFC_ERR_TIMEOUT on timeout
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*/
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nfc_err_t pn512_cmd_wait_idle(pn512_t *pPN512, int timeout)
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{
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(void) timeout;
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while (pn512_cmd_get(pPN512) != PN512_CMD_IDLE) {
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}
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return NFC_OK;
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}
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/** \internal Read executed command
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* \param pPN512 pointer to pn512_t structure
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* \return PN512 command being executed
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*/
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uint8_t pn512_cmd_get(pn512_t *pPN512)
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{
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return pn512_register_read(pPN512, PN512_REG_COMMAND) & PN512_CMD_REG_MASK;
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}
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/**
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* @}
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* @}
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* */
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