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Portenta C33 UNO R4 minima UNO R4 WiFi allow usage of TRNG #338

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Merged
merged 1 commit into from
Aug 19, 2024
Merged

Portenta C33 UNO R4 minima UNO R4 WiFi allow usage of TRNG #338

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44 changes: 44 additions & 0 deletions cores/arduino/WMath.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -23,10 +23,47 @@

extern "C" {
#include <stdlib.h>
#include "common_data.h"
}

#if defined (ARDUINO_PORTENTA_C33)
#define SCE_TRNG_SUPPORT 1
static long trng()
{
uint32_t value[4];
if (R_SCE_Open(&sce_ctrl, &sce_cfg) != FSP_SUCCESS)
return -1;
R_SCE_RandomNumberGenerate(value);
R_SCE_Close(&sce_ctrl);
return (long)value[0] >= 0 ? value[0] : -value[0];
}
#endif

#if defined(ARDUINO_UNOR4_WIFI) || defined(ARDUINO_UNOR4_MINIMA)
#define SCE_TRNG_SUPPORT 1
extern "C" {
fsp_err_t HW_SCE_McuSpecificInit(void);
fsp_err_t HW_SCE_RNG_Read(uint32_t * OutData_Text);
}
static long trng()
{
uint32_t value[4];
if (HW_SCE_McuSpecificInit() != FSP_SUCCESS)
return -1;
HW_SCE_RNG_Read(value);
return (long)value[0] >= 0 ? value[0] : -value[0];
}
#endif

#if (SCE_TRNG_SUPPORT == 1)
static bool useTRNG = true;
#endif

void randomSeed(unsigned long seed)
{
#if (SCE_TRNG_SUPPORT == 1)
useTRNG = false;
#endif
if (seed != 0) {
srand(seed);
}
Expand All @@ -37,6 +74,11 @@ long random(long howbig)
if (howbig == 0) {
return 0;
}
#if (SCE_TRNG_SUPPORT == 1)
if (useTRNG == true) {
return trng() % howbig;
}
#endif
return rand() % howbig;
}

Expand All @@ -48,3 +90,5 @@ long random(long howsmall, long howbig)
long diff = howbig - howsmall;
return random(diff) + howsmall;
}

#undef SCE_TRNG_SUPPORT
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