mirror of https://github.com/ARMmbed/mbed-os.git
76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
/*
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* Copyright (c) 2014-2018, 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_timer.c
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* \copyright Copyright (c) ARM Ltd 2014
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* \author Donatien Garnier
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*/
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#include "stack/nfc_errors.h"
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#include "pn512_timer.h"
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#include "pn512_registers.h"
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void pn512_timer_config(pn512_t *pPN512, bool autostart, uint16_t prescaler, uint16_t countdown_value)
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{
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pn512_timer_stop(pPN512); //just in case...
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pn512_register_write(pPN512, PN512_REG_TRELOADLOW, countdown_value & 0xFF);
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pn512_register_write(pPN512, PN512_REG_TRELOADHIGH, (countdown_value >> 8) & 0xFF);
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pn512_register_write(pPN512, PN512_REG_TPRESCALERLOW, prescaler & 0xFF);
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pn512_register_write(pPN512, PN512_REG_TMODE_TPRESCALERHIGH, (autostart ? 0x80 : 0x00) | ((prescaler >> 8) & 0x0F));
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}
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void pn512_timer_start(pn512_t *pPN512)
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{
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//The control register also contains the initiator bit that we must set correctly
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switch (pPN512->framing) {
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case nfc_framing_initiator_a_106:
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case nfc_framing_initiator_f_212:
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case nfc_framing_initiator_f_424:
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pn512_register_write(pPN512, PN512_REG_CONTROL, 0x50);
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break;
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case nfc_framing_target_mode_detector:
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case nfc_framing_target_a_106:
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case nfc_framing_target_f_212:
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case nfc_framing_target_f_424:
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default:
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pn512_register_write(pPN512, PN512_REG_CONTROL, 0x40);
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break;
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}
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}
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void pn512_timer_stop(pn512_t *pPN512)
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{
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//The control register also contains the initiator bit that we must set correctly
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switch (pPN512->framing) {
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case nfc_framing_initiator_a_106:
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case nfc_framing_initiator_f_212:
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case nfc_framing_initiator_f_424:
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pn512_register_write(pPN512, PN512_REG_CONTROL, 0x90);
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break;
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case nfc_framing_target_mode_detector:
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case nfc_framing_target_a_106:
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case nfc_framing_target_f_212:
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case nfc_framing_target_f_424:
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default:
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pn512_register_write(pPN512, PN512_REG_CONTROL, 0x80);
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break;
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}
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}
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