mirror of
https://github.com/espressif/openthread.git
synced 2026-07-05 03:40:26 +00:00
Jonathan Hui
115 lines
3.8 KiB
C
115 lines
3.8 KiB
C
/*
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* Copyright (c) 2017, The OpenThread Authors.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @file
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* This file implements a pseudo-random number generator.
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*
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* @warning
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* This implementation is not a true random number generator and does @em satisfy the Thread requirements.
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*
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*/
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#include <utils/code_utils.h>
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#include "platform-emsk.h"
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#include "openthread/platform/radio.h"
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#include "openthread/platform/random.h"
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#include <stdlib.h>
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#include <stdio.h>
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static unsigned int seed;
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void emskRandomInit(void)
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{
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unsigned int i;
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printf("Node No.:");
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scanf("%d", &i);
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printf("%d\n", i);
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seed = 10 + i;
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srand(seed);
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}
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uint32_t otPlatRandomGet(void)
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{
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return (uint32_t)rand();
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}
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otError otPlatRandomGetTrue(uint8_t *aOutput, uint16_t aOutputLength)
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{
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otError error = OT_ERROR_NONE;
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uint8_t channel = 0;
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otInstance *aInstance = NULL;
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otEXPECT_ACTION(aOutput && aOutputLength, error = OT_ERROR_INVALID_ARGS);
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// TODO: `otPlatRandomGet()` and `otPlatRandomGetTrue()` should include a pointer to the
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// owning OpenThread Instance as an input argument (similar to other platform APIs).
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//
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// The platform implementation requires to know the OpenThread instance to be able to
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// use other radio platform APIs. However, the emsk platform implementation of radio API
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// does not actually use the passed-in instance argument. Till the above TODO is done, as
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// a workaround, a NULL `aInstance` is used instead.
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/* disable radio*/
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if (otPlatRadioIsEnabled(aInstance))
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{
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channel = (mrf24j40_read_long_ctrl_reg(MRF24J40_RFCON0) >> 4) + 11;
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otPlatRadioSleep(aInstance);
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otPlatRadioDisable(aInstance);
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}
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/*
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* THE IMPLEMENTATION BELOW IS NOT COMPLIANT WITH THE THREAD SPECIFICATION.
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*
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* Please see Note in `<path-to-openthread>/examples/platforms/emsk/README.md`
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* for TRNG features on EMSK.
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*/
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otEXPECT_ACTION(aOutput && aOutputLength, error = OT_ERROR_INVALID_ARGS);
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for (uint16_t length = 0; length < aOutputLength; length++)
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{
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/* Get random number */
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aOutput[length] = (uint8_t)otPlatRandomGet();
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}
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/* Enable radio*/
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if (channel)
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{
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emskRadioInit();
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otPlatRadioEnable(aInstance);
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otPlatRadioReceive(aInstance, channel);
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}
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exit:
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return error;
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}
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