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TRNG: keep track of initialization status #508

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10 changes: 8 additions & 2 deletions cores/arduino/WMath.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -48,8 +48,14 @@ extern "C" {
static long trng()
{
uint32_t value[4];
if (HW_SCE_McuSpecificInit() != FSP_SUCCESS)
return -1;
static bool SCE_inited = false;
if (!SCE_inited) {
if (HW_SCE_McuSpecificInit() != FSP_SUCCESS) {
return -1;
}
SCE_inited = true;
}

HW_SCE_RNG_Read(value);
return (long)value[0] >= 0 ? value[0] : -value[0];
}
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