Random Number Generation

Hello Logan,

C library has rand() function call which can be seeded with something like the temperature sensor.

Regards
Amit

Hello Amit,

Do you have a code sample that shows how to seed the srand() function call with this data? Do we just use the ADC_CTL_TS register directly? Also, does that register provide a suitable seed to produce psuedo-random numbers?

Thanks,
Logan

Hello Logan,

I do not have a code example which uses TS register output. But as working example, if I want to have a predictable random data pattern then I would use something as below where a 8-bit array is being prefilled with a random data (to cap the value I am using the remainder of the rand mod 255)

//
// PreFill Slave TX Buffer
//
for(ui32Index=0;ui32Index<I2C0_RXBUF_SIZE;ui32Index++)
{
g_ui8STxBuf[ui32Index] = rand()%255;
}

In your case it may be more like

srand(g_ui32TempSense);
//
// PreFill Slave TX Buffer
//
for(ui32Index=0;ui32Index<I2C0_RXBUF_SIZE;ui32Index++)
{
g_ui8STxBuf[ui32Index] = rand()%255;
}


Regards
Amit

Hi Amit,

Thank you for your response. I was wondering what you have g_ui32TempSense set to?

Regards,
Logan

Hello Logan,

The value of g_ui32TempSense is the converted value from ADC's Temp Sense. This can be a one time event at start up to give a randomness to the subsequent rand function call

Regards
Amit