/* Device driver will call this function which returns immediately.
* Incoming packet will be processed later on in the dev loop.
*/
int32_t pico_stack_recv(struct pico_device *dev, uint8_t *buffer, uint32_t len)
{
struct pico_frame *f;
int32_t ret;
if (len == 0)
return -1;
f = pico_frame_alloc(len);
if (!f)
{
dbg("Cannot alloc incoming frame!\n");
return -1;
}
/* Association to the device that just received the frame. */
f->dev = dev;
/* Setup the start pointer, length. */
f->start = f->buffer;
f->len = f->buffer_len;
if (f->len > 8) {
uint32_t rand, mid_frame = (f->buffer_len >> 2) << 1;
mid_frame -= (mid_frame % 4);
memcpy(&rand, f->buffer + mid_frame, sizeof(uint32_t));
pico_rand_feed(rand);
}
/* Device driver will call this function which returns immediately.
* Incoming packet will be processed later on in the dev loop.
*/
int pico_stack_recv(struct pico_device *dev, uint8_t *buffer, int len)
{
struct pico_frame *f;
int ret;
if (len <= 0)
return -1;
f = pico_frame_alloc(len);
if (!f)
return -1;
/* Association to the device that just received the frame. */
f->dev = dev;
/* Setup the start pointer, lenght. */
f->start = f->buffer;
f->len = f->buffer_len;
if (f->len > 8) {
int mid_frame = (f->buffer_len >> 2)<<1;
mid_frame -= (mid_frame % 4);
pico_rand_feed(*(uint32_t*)(f->buffer + mid_frame));
}
uint32_t pico_rand(void)
{
pico_rand_feed((uint32_t)pico_tick);
return _rand_seed;
}