mirror of https://github.com/ARMmbed/mbed-os.git
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2013-2016 Realtek Semiconductor Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may 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,
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* WITHOUT 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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#include "trng_api.h"
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#include "analogin_api.h"
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#include "analogin_ext.h"
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#ifdef DEVICE_TRNG
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static analogin_t tradcng;
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static uint8_t trng_inited;
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void trng_init(trng_t *obj)
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{
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if (trng_inited != 0) {
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return;
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}
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analogin_init(&tradcng, ADC0);
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trng_inited = 1;
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}
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void trng_free(trng_t *obj)
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{
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trng_inited = 0;
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analogin_deinit(&tradcng);
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}
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static void trng_get_byte(unsigned char *byte)
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{
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size_t bit;
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uint32_t adc[2];
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PSAL_ADC_MNGT_ADPT pSalADCMngtAdpt = NULL;
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PSAL_ADC_HND pSalADCHND = NULL;
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pSalADCMngtAdpt = &(tradcng.SalADCMngtAdpt);
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pSalADCHND = &(pSalADCMngtAdpt->pSalHndPriv->SalADCHndPriv);
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*byte = 0;
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for (bit=0; bit<8; bit++) {
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RtkADCRxManualRotate(pSalADCHND, adc);
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*byte |= (adc[0] & 0x01) << bit;
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}
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}
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int trng_get_bytes(trng_t *obj, uint8_t *buf, size_t len, size_t *output_len)
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{
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size_t i;
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for (i = 0; i < len; i++) {
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trng_get_byte(buf + i);
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}
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*output_len = len;
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return 0;
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}
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#endif
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