static ssize_t devurand_read(FAR struct file *filep, FAR char *buffer,
size_t len)
{
#ifdef CONFIG_DEV_URANDOM_RANDOM_POOL
if (len)
{
getrandom(buffer, len);
}
#else
size_t n;
uint32_t rnd;
n = len;
/* Align buffer pointer to 4-byte boundry */
if (((uintptr_t)buffer & 0x03) != 0)
{
/* Generate a pseudo random number */
rnd = PRNG();
while (((uintptr_t)buffer & 0x03) != 0)
{
if (n <= 0)
{
return len;
}
*buffer++ = rnd & 0xff;
rnd >>= 8;
--n;
}
}
int main(void)
{
NVIC_SetVectorTable(NVIC_VectTab_FLASH, (u32)&_vectors);
__USB_Init();
//__Clear_Screen(0x0000);
// display 400x240
for (int x=0; x<400; x++)
for (int y=0; y<240-16; y++)
{
u32 dx = (x-200);
u32 dy = (y-120);
dx *= dx;
dy *= dy;
u32 dl = dx+dy;
__Point_SCR(x, y);
__LCD_SetPixl((uc16)(dl>>3) & 0x001f);
}
__Display_Str(20, 200, 0xffff, 0, "Hello DS203 Test... ");
int x[3] = {20, 380, 220};
int y[3] = {20, 40, 220};
int curx = x[0];
int cury = y[0];
while ( !(GetKeys() & KEY2_STATUS) )
{
int c = PRNG();
int r = c%3;
curx = (curx+x[r]) >> 1;
cury = (cury+y[r]) >> 1;
__Point_SCR(curx, cury);
__LCD_SetPixl(c<<1); // len do 32k
}
Reboot();
return 0;
}
void Random<T_PRNG>::Init(const uint64_t& seed)
{
ResetState(PRNG(static_cast<typename PRNG::result_type>(seed)));
}