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*/ | |
/** \addtogroup rtng_module Working with RTNG | |
* \ingroup peripherals_module | |
* The TRNG driver provides the interface to configure and use the TRNG peripheral. | |
* \n | |
* | |
* The True Random Number Generator (TRNG) passes the American NIST Special Publication | |
* 800-22 and Diehard Random Tests Suites. As soon as the TRNG is enabled (TRNG_Enable()), | |
* the generator provides one 32-bit value every 84 clock cycles. | |
* Interrupt trng_int can be enabled through TRNG_EnableIt()(respectively disabled in TRNG_IDR). | |
* This interrupt is set when a new random value is available and is cleared when the status | |
* register is read (TRNG_SR register). The flag DATRDY of the status register (TRNG_ISR) is set | |
* when the random data is ready to be read out on the 32-bit output data through TRNG_GetRandData(). | |
* | |
* For more accurate information, please look at the SHA section of the | |
* Datasheet. | |
* | |
* Related files :\n | |
* \ref trng.c\n | |
* \ref trng.h\n | |
*/ | |
/*@{*/ | |
/*@}*/ | |
/** | |
* \file | |
* | |
* Implementation of True Random Number Generator (TRNG) | |
* | |
*/ | |
/*---------------------------------------------------------------------------- | |
* Headers | |
*----------------------------------------------------------------------------*/ | |
#include "chip.h" | |
/*---------------------------------------------------------------------------- | |
* Exported functions | |
*----------------------------------------------------------------------------*/ | |
/** | |
* \brief Enables the TRNG to provide Random Values. | |
* \param key This key is to be written when the ENABLE bit is set. | |
*/ | |
void TRNG_Enable(void) | |
{ | |
TRNG->TRNG_CR = TRNG_CR_ENABLE | TRNG_CR_KEY_PASSWD; | |
} | |
/** | |
* \brief Disables the TRNG to provide Random Values. | |
* \param key This key is to be written when the DISABLE bit is set. | |
*/ | |
void TRNG_Disable(void) | |
{ | |
TRNG->TRNG_CR = TRNG_CR_KEY_PASSWD; | |
} | |
/** | |
* \brief Data Ready Interrupt enable. | |
*/ | |
void TRNG_EnableIt(void) | |
{ | |
TRNG->TRNG_IER = TRNG_IER_DATRDY; | |
} | |
/** | |
* \brief Data Ready Interrupt Disable. | |
*/ | |
void TRNG_DisableIt(void) | |
{ | |
TRNG->TRNG_IDR = TRNG_IDR_DATRDY; | |
} | |
/** | |
* \brief Get the current status register of the given TRNG peripheral. | |
* \return TRNG status register. | |
*/ | |
uint32_t TRNG_GetStatus(void) | |
{ | |
return TRNG->TRNG_ISR; | |
} | |
/** | |
* \brief Get the 32-bit Output Data from TRNG peripheral. | |
* \return TRNG output data. | |
*/ | |
uint32_t TRNG_GetRandData(void) | |
{ | |
return TRNG->TRNG_ODATA; | |
} |