1.2.26 1.4.27 1.6.26 1.9.24 1.32.30 1.38.26 1.39.22 1.40.25 True Random Number Generator (TRNG)
As soon as the TRNG is enabled, the module provides a new 32-bit random data, for every 84 peripheral clock cycles.
The TRNG can optionally generate an interrupt when a new random value is available.
Using The Library
The library provides both blocking and callback methods to generate and read the random number.
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With blocking API, it enables the TRNG module, waits for new random number to be available and then returns the newly generated random number.
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With callback, it enables the TRNG module and the registered callback function will be called once the new random value is available.
Blocking API
The example code to generate 32-bit random number using blocking API is given below.
uint32_t trueRandomNumber trueRandomNumber = TRNG_ReadData();
Callback method
This example demonstrates how to use callback to generate 32-bit random number.
uint32_t trueRandomNumber; /* Random number is provided as part of callback */ void TRNG_EventHandler(uint32_t randomNumber, uintptr_t context) { trueRandomNumber = randomNumber; } int main(void) { /* Register Callback */ TRNG_CallbackRegister(TRNG_EventHandler, (uintptr_t) NULL); /* Enable TRNG */ TRNG_RandomNumberGenerate(); }
Library Interface
True Random Number Generator peripheral library provides the following interfaces:
Functions
Name | Description |
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TRNG_Initialize | Initializes TRNG module of the device |
TRNG_RandomNumberGenerate | Initiates generation of random number using the TRNG peripheral in interrupt mode |
TRNG_ReadData | Generates and returns a 32-bit random number in blocking mode |
TRNG_CallbackRegister | Sets the pointer to the function (and it's context) to be called when the random number is ready to be read |
Data types and constants
Name | Type | Description |
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TRNG_CALLBACK | Typedef | Defines the data type and function signature for the TRNG peripheral callback function |