static int nd_send(netdev2_t *netdev, const struct iovec *data, unsigned count)
{
enc28j60_t *dev = (enc28j60_t *)netdev;
uint8_t ctrl = 0;
int c = 0;
mutex_lock(&dev->devlock);
#ifdef MODULE_NETSTATS_L2
netdev->stats.tx_bytes += count;
#endif
/* set write pointer */
cmd_w_addr(dev, ADDR_WRITE_PTR, BUF_TX_START);
/* write control byte and the actual data into the buffer */
cmd_wbm(dev, &ctrl, 1);
for (int i = 0; i < count; i++) {
c += data[i].iov_len;
cmd_wbm(dev, (uint8_t *)data[i].iov_base, data[i].iov_len);
}
/* set TX end pointer */
cmd_w_addr(dev, ADDR_TX_END, cmd_r_addr(dev, ADDR_WRITE_PTR) - 1);
/* trigger the send process */
cmd_bfs(dev, REG_ECON1, -1, ECON1_TXRTS);
mutex_unlock(&dev->devlock);
return c;
}
static int nd_recv(netdev2_t *netdev, char *buf, int max_len, void *info)
{
enc28j60_t *dev = (enc28j60_t *)netdev;
uint8_t head[6];
size_t size;
uint16_t next;
(void)info;
mutex_lock(&dev->devlock);
/* set read pointer to RX read address */
cmd_w_addr(dev, ADDR_READ_PTR, cmd_r_addr(dev, ADDR_RX_READ));
/* read packet header */
cmd_rbm(dev, head, 6);
/* TODO: care for endianess */
next = (uint16_t)((head[1] << 8) | head[0]);
size = (size_t)((head[3] << 8) | head[2]) - 4; /* discard CRC */
if (buf != NULL) {
/* read packet content into the supplied buffer */
if (size <= max_len) {
cmd_rbm(dev, (uint8_t *)buf, size);
} else {
DEBUG("[enc28j60] recv: unable to get packet - buffer too small\n");
size = 0;
}
/* release memory */
cmd_w_addr(dev, ADDR_RX_READ, next);
cmd_bfs(dev, REG_ECON2, -1, ECON2_PKTDEC);
}
mutex_unlock(&dev->devlock);
return (int)size;
}
