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;
}
static int nd_init(netdev2_t *netdev)
{
enc28j60_t *dev = (enc28j60_t *)netdev;
int res;
uint8_t tmp;
/* get exclusive access of the device */
mutex_lock(&dev->devlock);
/* setup the low-level interfaces */
gpio_init(dev->reset_pin, GPIO_OUT);
gpio_clear(dev->reset_pin); /* this puts the device into reset state */
gpio_init(dev->cs_pin, GPIO_OUT);
gpio_set(dev->cs_pin);
gpio_init_int(dev->int_pin, GPIO_IN, GPIO_FALLING, on_int, (void *)dev);
res = spi_init_master(dev->spi, SPI_CONF_FIRST_RISING, SPI_SPEED);
if (res < 0) {
DEBUG("[enc28j60] init: error initializing SPI bus [%i]\n", res);
return -1;
}
/* wait at least 1ms and then release device from reset state */
xtimer_usleep(DELAY_RESET);
gpio_set(dev->reset_pin);
/* wait for oscillator to be stable before proceeding */
res = 0;
do {
tmp = cmd_rcr(dev, REG_ESTAT, -1);
if (res++ >= STARTUP_TIMEOUT) {
DEBUG("[enc28j60] init: error waiting for stable clock, SPI ok?\n");
return -1;
}
} while (!(tmp & ESTAT_CLKRDY));
/* disable clock output to save a little power */
cmd_wcr(dev, REG_B3_ECOCON, 3, 0x00);
/* BUFFER configuration */
/* configure the RX buffer */
cmd_w_addr(dev, ADDR_RX_START, BUF_RX_START);
cmd_w_addr(dev, ADDR_RX_END, BUF_RX_END);
cmd_w_addr(dev, ADDR_RX_READ, BUF_RX_START);
/* configure the TX buffer */
cmd_w_addr(dev, ADDR_TX_START, BUF_TX_START);
cmd_w_addr(dev, ADDR_TX_END, BUF_TX_END);
/* FILTER configuration */
/* setup receive filters - we accept everything per default */
cmd_wcr(dev, REG_B1_ERXFCON, 1, 0);
/* MAC configuration */
/* enable RX through filter and enable sending of RX and TX pause frames */
tmp = (MACON1_TXPAUS | MACON1_RXPAUS | MACON1_MARXEN);
cmd_wcr(dev, REG_B2_MACON1, 2, tmp);
/* enable full duplex mode, padding to min 60 byte + CRC for all frames and
* CRC creation for all packets before transmission */
tmp = (MACON3_FULDPX | MACON3_PADCFG0 | MACON3_TXCRCEN | MACON3_FRMLNEN);
cmd_wcr(dev, REG_B2_MACON3, 2, tmp);
/* defer TX infinitely if medium is busy for IEEE 802.3 compliance */
tmp = (MACON4_DEFER);
cmd_wcr(dev, REG_B2_MACON4, 2, tmp);
/* set back-to-back inter-packet gap -> 0x15 for full duplex */
cmd_wcr(dev, REG_B2_MABBIPG, 2, MABBIPG_FD);
/* set non-back-to-back inter packet gap -> 0x12 is default */
cmd_wcr(dev, REG_B2_MAIPGL, 2, MAIPGL_FD);
/* set default MAC address */
#if CPUID_LEN
uint8_t macbuf[CPUID_LEN];
cpuid_get(&macbuf); /* we get the full ID but use only parts of it */
macbuf[0] |= 0x02; /* locally administered address */
macbuf[0] &= ~0x01; /* unicast address */
#else
uint8_t macbuf[] = ENC28J60_FALLBACK_MAC;
#endif
mac_set(dev, macbuf);
/* PHY configuration */
cmd_w_phy(dev, REG_PHY_PHCON1, PHCON1_PDPXMD);
cmd_w_phy(dev, REG_PHY_PHIE, PHIE_PLNKIE | PHIE_PGEIE);
/* Finishing touches */
/* enable hardware flow control */
cmd_wcr(dev, REG_B3_EFLOCON, 3, EFLOCON_FULDPXS | EFLOCON_FCEN1);
/* enable auto-inc of read and write pointers for the RBM/WBM commands */
cmd_bfs(dev, REG_ECON2, -1, ECON2_AUTOINC);
/* enable receive, link and tx interrupts */
cmd_bfc(dev, REG_EIR, -1, (EIR_LINKIF | EIR_PKTIF | EIR_RXERIF | EIR_TXIF |
EIR_TXERIF));
cmd_bfs(dev, REG_EIE, -1, (EIE_INTIE | EIE_LINKIE | EIE_PKTIE | EIE_RXERIE |
EIE_TXIE | EIE_TXERIE));
/* allow receiving bytes from now on */
cmd_bfs(dev, REG_ECON1, -1, ECON1_RXEN);
#ifdef MODULE_NETSTATS_L2
memset(&netdev->stats, 0, sizeof(netstats_t));
#endif
mutex_unlock(&dev->devlock);
return 0;
}