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micropython/ports/stm32/eth.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include "py/mphal.h"
#include "py/mperrno.h"
#include "lib/netutils/netutils.h"
#include "pin_static_af.h"
#include "modnetwork.h"
#include "mpu.h"
#include "eth.h"
#if defined(MICROPY_HW_ETH_MDC)
#include "lwip/etharp.h"
#include "lwip/dns.h"
#include "lwip/dhcp.h"
#include "netif/ethernet.h"
// ETH PHY register definitions (for LAN8742)
#undef PHY_BCR
#define PHY_BCR (0x0000)
#define PHY_BCR_SOFT_RESET (0x8000)
#define PHY_BCR_AUTONEG_EN (0x1000)
#undef PHY_BSR
#define PHY_BSR (0x0001)
#define PHY_BSR_LINK_STATUS (0x0004)
#define PHY_BSR_AUTONEG_DONE (0x0020)
#define PHY_SCSR (0x001f)
#define PHY_SCSR_SPEED_Pos (2)
#define PHY_SCSR_SPEED_Msk (7 << PHY_SCSR_SPEED_Pos)
#define PHY_SCSR_SPEED_10HALF (1 << PHY_SCSR_SPEED_Pos)
#define PHY_SCSR_SPEED_10FULL (5 << PHY_SCSR_SPEED_Pos)
#define PHY_SCSR_SPEED_100HALF (2 << PHY_SCSR_SPEED_Pos)
#define PHY_SCSR_SPEED_100FULL (6 << PHY_SCSR_SPEED_Pos)
// ETH DMA RX and TX descriptor definitions
#define RX_DESCR_0_OWN_Pos (31)
#define RX_DESCR_0_FL_Pos (16)
#define RX_DESCR_0_FL_Msk (0x3fff << RX_DESCR_0_FL_Pos)
#define RX_DESCR_1_RER_Pos (15)
#define RX_DESCR_1_RCH_Pos (14)
#define RX_DESCR_1_RBS2_Pos (16)
#define RX_DESCR_1_RBS1_Pos (0)
#define TX_DESCR_0_OWN_Pos (31)
#define TX_DESCR_0_LS_Pos (29)
#define TX_DESCR_0_FS_Pos (28)
#define TX_DESCR_0_DP_Pos (26)
#define TX_DESCR_0_CIC_Pos (22)
#define TX_DESCR_0_TER_Pos (21)
#define TX_DESCR_0_TCH_Pos (20)
#define TX_DESCR_1_TBS1_Pos (0)
// Configuration values
#define PHY_INIT_TIMEOUT_MS (10000)
#define RX_BUF_SIZE (1524) // includes 4-byte CRC at end
#define TX_BUF_SIZE (1524)
#define RX_BUF_NUM (5)
#define TX_BUF_NUM (5)
typedef struct _eth_dma_rx_descr_t {
volatile uint32_t rdes0, rdes1, rdes2, rdes3;
} eth_dma_rx_descr_t;
typedef struct _eth_dma_tx_descr_t {
volatile uint32_t tdes0, tdes1, tdes2, tdes3;
} eth_dma_tx_descr_t;
typedef struct _eth_dma_t {
eth_dma_rx_descr_t rx_descr[RX_BUF_NUM];
eth_dma_tx_descr_t tx_descr[TX_BUF_NUM];
uint8_t rx_buf[RX_BUF_NUM * RX_BUF_SIZE] __attribute__((aligned(4)));
uint8_t tx_buf[TX_BUF_NUM * TX_BUF_SIZE] __attribute__((aligned(4)));
size_t rx_descr_idx;
size_t tx_descr_idx;
uint8_t padding[16384 - 15408];
} eth_dma_t;
typedef struct _eth_t {
uint32_t trace_flags;
struct netif netif;
struct dhcp dhcp_struct;
} eth_t;
static eth_dma_t eth_dma __attribute__((aligned(16384)));
eth_t eth_instance;
STATIC void eth_mac_deinit(eth_t *self);
STATIC void eth_process_frame(eth_t *self, size_t len, const uint8_t *buf);
STATIC void eth_phy_write(uint32_t reg, uint32_t val) {
while (ETH->MACMIIAR & ETH_MACMIIAR_MB) {
}
ETH->MACMIIDR = val;
uint32_t ar = ETH->MACMIIAR;
ar = reg << ETH_MACMIIAR_MR_Pos | (ar & ETH_MACMIIAR_CR_Msk) | ETH_MACMIIAR_MW | ETH_MACMIIAR_MB;
ETH->MACMIIAR = ar;
while (ETH->MACMIIAR & ETH_MACMIIAR_MB) {
}
}
STATIC uint32_t eth_phy_read(uint32_t reg) {
while (ETH->MACMIIAR & ETH_MACMIIAR_MB) {
}
uint32_t ar = ETH->MACMIIAR;
ar = reg << ETH_MACMIIAR_MR_Pos | (ar & ETH_MACMIIAR_CR_Msk) | ETH_MACMIIAR_MB;
ETH->MACMIIAR = ar;
while (ETH->MACMIIAR & ETH_MACMIIAR_MB) {
}
return ETH->MACMIIDR;
}
void eth_init(eth_t *self, int mac_idx) {
mp_hal_get_mac(mac_idx, &self->netif.hwaddr[0]);
self->netif.hwaddr_len = 6;
}
void eth_set_trace(eth_t *self, uint32_t value) {
self->trace_flags = value;
}
STATIC int eth_mac_init(eth_t *self) {
// Configure MPU
uint32_t irq_state = mpu_config_start();
mpu_config_region(MPU_REGION_ETH, (uint32_t)&eth_dma, MPU_CONFIG_ETH(MPU_REGION_SIZE_16KB));
mpu_config_end(irq_state);
// Configure GPIO
mp_hal_pin_config_alt_static(MICROPY_HW_ETH_MDC, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, STATIC_AF_ETH_MDC);
mp_hal_pin_config_alt_static(MICROPY_HW_ETH_MDIO, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, STATIC_AF_ETH_MDIO);
mp_hal_pin_config_alt_static(MICROPY_HW_ETH_RMII_REF_CLK, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, STATIC_AF_ETH_RMII_REF_CLK);
mp_hal_pin_config_alt_static(MICROPY_HW_ETH_RMII_CRS_DV, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, STATIC_AF_ETH_RMII_CRS_DV);
mp_hal_pin_config_alt_static(MICROPY_HW_ETH_RMII_RXD0, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, STATIC_AF_ETH_RMII_RXD0);
mp_hal_pin_config_alt_static(MICROPY_HW_ETH_RMII_RXD1, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, STATIC_AF_ETH_RMII_RXD1);
mp_hal_pin_config_alt_static(MICROPY_HW_ETH_RMII_TX_EN, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, STATIC_AF_ETH_RMII_TX_EN);
mp_hal_pin_config_alt_static(MICROPY_HW_ETH_RMII_TXD0, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, STATIC_AF_ETH_RMII_TXD0);
mp_hal_pin_config_alt_static(MICROPY_HW_ETH_RMII_TXD1, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, STATIC_AF_ETH_RMII_TXD1);
__HAL_RCC_ETH_CLK_ENABLE();
__HAL_RCC_ETHMAC_FORCE_RESET();
// Select RMII interface
__HAL_RCC_SYSCFG_CLK_ENABLE();
SYSCFG->PMC |= SYSCFG_PMC_MII_RMII_SEL;
__HAL_RCC_ETHMAC_RELEASE_RESET();
__HAL_RCC_ETHMAC_CLK_SLEEP_ENABLE();
__HAL_RCC_ETHMACTX_CLK_SLEEP_ENABLE();
__HAL_RCC_ETHMACRX_CLK_SLEEP_ENABLE();
// Do a soft reset of the MAC core
ETH->DMABMR = ETH_DMABMR_SR;
mp_hal_delay_ms(2);
// Wait for soft reset to finish
uint32_t t0 = mp_hal_ticks_ms();
while (ETH->DMABMR & ETH_DMABMR_SR) {
if (mp_hal_ticks_ms() - t0 > 1000) {
return -MP_ETIMEDOUT;
}
}
// Set MII clock range
uint32_t hclk = HAL_RCC_GetHCLKFreq();
uint32_t cr_div;
if (hclk < 35000000) {
cr_div = ETH_MACMIIAR_CR_Div16;
} else if (hclk < 60000000) {
cr_div = ETH_MACMIIAR_CR_Div26;
} else if (hclk < 100000000) {
cr_div = ETH_MACMIIAR_CR_Div42;
} else if (hclk < 150000000) {
cr_div = ETH_MACMIIAR_CR_Div62;
} else {
cr_div = ETH_MACMIIAR_CR_Div102;
}
ETH->MACMIIAR = cr_div;
// Reset the PHY
eth_phy_write(PHY_BCR, PHY_BCR_SOFT_RESET);
mp_hal_delay_ms(50);
// Wait for the PHY link to be established
int phy_state = 0;
t0 = mp_hal_ticks_ms();
while (phy_state != 3) {
if (mp_hal_ticks_ms() - t0 > PHY_INIT_TIMEOUT_MS) {
eth_mac_deinit(self);
return -MP_ETIMEDOUT;
}
uint16_t bcr = eth_phy_read(0);
uint16_t bsr = eth_phy_read(1);
switch (phy_state) {
case 0:
if (!(bcr & PHY_BCR_SOFT_RESET)) {
phy_state = 1;
}
break;
case 1:
if (bsr & PHY_BSR_LINK_STATUS) {
eth_phy_write(PHY_BCR, PHY_BCR_AUTONEG_EN);
phy_state = 2;
}
break;
case 2:
if ((bsr & (PHY_BSR_AUTONEG_DONE | PHY_BSR_LINK_STATUS))
== (PHY_BSR_AUTONEG_DONE | PHY_BSR_LINK_STATUS)) {
phy_state = 3;
}
break;
}
mp_hal_delay_ms(2);
}
// Get register with link status
uint16_t phy_scsr = eth_phy_read(PHY_SCSR);
// Burst mode configuration
ETH->DMABMR = 0;
mp_hal_delay_ms(2);
// Select DMA interrupts
ETH->DMAIER =
ETH_DMAIER_NISE // enable normal interrupts
| ETH_DMAIER_RIE // enable RX interrupt
;
// Configure RX descriptor lists
for (size_t i = 0; i < RX_BUF_NUM; ++i) {
eth_dma.rx_descr[i].rdes0 = 1 << RX_DESCR_0_OWN_Pos;
eth_dma.rx_descr[i].rdes1 =
1 << RX_DESCR_1_RCH_Pos // chained
| RX_BUF_SIZE << RX_DESCR_1_RBS1_Pos
;
eth_dma.rx_descr[i].rdes2 = (uint32_t)&eth_dma.rx_buf[i * RX_BUF_SIZE];
eth_dma.rx_descr[i].rdes3 = (uint32_t)&eth_dma.rx_descr[(i + 1) % RX_BUF_NUM];
}
ETH->DMARDLAR = (uint32_t)&eth_dma.rx_descr[0];
eth_dma.rx_descr_idx = 0;
// Configure TX descriptor lists
for (size_t i = 0; i < TX_BUF_NUM; ++i) {
eth_dma.tx_descr[i].tdes0 = 1 << TX_DESCR_0_TCH_Pos;
eth_dma.tx_descr[i].tdes1 = 0;
eth_dma.tx_descr[i].tdes2 = 0;
eth_dma.tx_descr[i].tdes3 = (uint32_t)&eth_dma.tx_descr[(i + 1) % TX_BUF_NUM];
}
ETH->DMATDLAR = (uint32_t)&eth_dma.tx_descr[0];
eth_dma.tx_descr_idx = 0;
// Configure DMA
ETH->DMAOMR =
ETH_DMAOMR_RSF // read from RX FIFO after a full frame is written
| ETH_DMAOMR_TSF // transmit when a full frame is in TX FIFO (needed by errata)
;
mp_hal_delay_ms(2);
// Select MAC filtering options
ETH->MACFFR =
ETH_MACFFR_RA // pass all frames up
;
mp_hal_delay_ms(2);
// Set MAC address
u8_t *mac = &self->netif.hwaddr[0];
ETH->MACA0HR = mac[5] << 8 | mac[4];
mp_hal_delay_ms(2);
ETH->MACA0LR = mac[3] << 24 | mac[2] << 16 | mac[1] << 8 | mac[0];
mp_hal_delay_ms(2);
// Set main MAC control register
ETH->MACCR =
(phy_scsr & PHY_SCSR_SPEED_Msk) == PHY_SCSR_SPEED_10FULL ? ETH_MACCR_DM
: (phy_scsr & PHY_SCSR_SPEED_Msk) == PHY_SCSR_SPEED_100HALF ? ETH_MACCR_FES
: (phy_scsr & PHY_SCSR_SPEED_Msk) == PHY_SCSR_SPEED_100FULL ? (ETH_MACCR_FES | ETH_MACCR_DM)
: 0
;
mp_hal_delay_ms(2);
// Start MAC layer
ETH->MACCR |=
ETH_MACCR_TE // enable TX
| ETH_MACCR_RE // enable RX
;
mp_hal_delay_ms(2);
// Start DMA layer
ETH->DMAOMR |=
ETH_DMAOMR_ST // start TX
| ETH_DMAOMR_SR // start RX
;
mp_hal_delay_ms(2);
// Enable interrupts
NVIC_SetPriority(ETH_IRQn, IRQ_PRI_PENDSV);
HAL_NVIC_EnableIRQ(ETH_IRQn);
return 0;
}
STATIC void eth_mac_deinit(eth_t *self) {
(void)self;
HAL_NVIC_DisableIRQ(ETH_IRQn);
__HAL_RCC_ETHMAC_FORCE_RESET();
__HAL_RCC_ETHMAC_RELEASE_RESET();
__HAL_RCC_ETH_CLK_DISABLE();
}
STATIC int eth_tx_buf_get(size_t len, uint8_t **buf) {
if (len > TX_BUF_SIZE) {
return -MP_EINVAL;
}
// Wait for DMA to release the current TX descriptor (if it has it)
eth_dma_tx_descr_t *tx_descr = &eth_dma.tx_descr[eth_dma.tx_descr_idx];
uint32_t t0 = mp_hal_ticks_ms();
for (;;) {
if (!(tx_descr->tdes0 & (1 << TX_DESCR_0_OWN_Pos))) {
break;
}
if (mp_hal_ticks_ms() - t0 > 1000) {
return -MP_ETIMEDOUT;
}
}
// Update TX descriptor with length, buffer pointer and linked list pointer
*buf = &eth_dma.tx_buf[eth_dma.tx_descr_idx * TX_BUF_SIZE];
tx_descr->tdes1 = len << TX_DESCR_1_TBS1_Pos;
tx_descr->tdes2 = (uint32_t)*buf;
tx_descr->tdes3 = (uint32_t)&eth_dma.tx_descr[(eth_dma.tx_descr_idx + 1) % TX_BUF_NUM];
return 0;
}
STATIC int eth_tx_buf_send(void) {
// Get TX descriptor and move to next one
eth_dma_tx_descr_t *tx_descr = &eth_dma.tx_descr[eth_dma.tx_descr_idx];
eth_dma.tx_descr_idx = (eth_dma.tx_descr_idx + 1) % TX_BUF_NUM;
// Schedule to send next outgoing frame
tx_descr->tdes0 =
1 << TX_DESCR_0_OWN_Pos // owned by DMA
| 1 << TX_DESCR_0_LS_Pos // last segment
| 1 << TX_DESCR_0_FS_Pos // first segment
| 3 << TX_DESCR_0_CIC_Pos // enable all checksums inserted by hardware
| 1 << TX_DESCR_0_TCH_Pos // TX descriptor is chained
;
// Notify ETH DMA that there is a new TX descriptor for sending
__DMB();
if (ETH->DMASR & ETH_DMASR_TBUS) {
ETH->DMASR = ETH_DMASR_TBUS;
ETH->DMATPDR = 0;
}
return 0;
}
STATIC void eth_dma_rx_free(void) {
// Get RX descriptor, RX buffer and move to next one
eth_dma_rx_descr_t *rx_descr = &eth_dma.rx_descr[eth_dma.rx_descr_idx];
uint8_t *buf = &eth_dma.rx_buf[eth_dma.rx_descr_idx * RX_BUF_SIZE];
eth_dma.rx_descr_idx = (eth_dma.rx_descr_idx + 1) % RX_BUF_NUM;
// Schedule to get next incoming frame
rx_descr->rdes1 =
1 << RX_DESCR_1_RCH_Pos // RX descriptor is chained
| RX_BUF_SIZE << RX_DESCR_1_RBS1_Pos // maximum buffer length
;
rx_descr->rdes2 = (uint32_t)buf;
rx_descr->rdes3 = (uint32_t)&eth_dma.rx_descr[eth_dma.rx_descr_idx];
rx_descr->rdes0 = 1 << RX_DESCR_0_OWN_Pos; // owned by DMA
// Notify ETH DMA that there is a new RX descriptor available
__DMB();
ETH->DMARPDR = 0;
}
void ETH_IRQHandler(void) {
uint32_t sr = ETH->DMASR;
ETH->DMASR = ETH_DMASR_NIS;
if (sr & ETH_DMASR_RS) {
ETH->DMASR = ETH_DMASR_RS;
for (;;) {
eth_dma_rx_descr_t *rx_descr = &eth_dma.rx_descr[eth_dma.rx_descr_idx];
if (rx_descr->rdes0 & (1 << RX_DESCR_0_OWN_Pos)) {
// No more RX descriptors ready to read
break;
}
// Get RX buffer containing new frame
size_t len = (rx_descr->rdes0 & RX_DESCR_0_FL_Msk) >> RX_DESCR_0_FL_Pos;
len -= 4; // discard CRC at end
uint8_t *buf = (uint8_t*)rx_descr->rdes2;
// Process frame
eth_process_frame(&eth_instance, len, buf);
eth_dma_rx_free();
}
}
}
/*******************************************************************************/
// ETH-LwIP bindings
#define TRACE_ASYNC_EV (0x0001)
#define TRACE_ETH_TX (0x0002)
#define TRACE_ETH_RX (0x0004)
#define TRACE_ETH_FULL (0x0008)
STATIC void eth_trace(eth_t *self, size_t len, const void *data, unsigned int flags) {
if (((flags & NETUTILS_TRACE_IS_TX) && (self->trace_flags & TRACE_ETH_TX))
|| (!(flags & NETUTILS_TRACE_IS_TX) && (self->trace_flags & TRACE_ETH_RX))) {
const uint8_t *buf;
if (len == (size_t)-1) {
// data is a pbuf
const struct pbuf *pbuf = data;
buf = pbuf->payload;
len = pbuf->len; // restricted to print only the first chunk of the pbuf
} else {
// data is actual data buffer
buf = data;
}
if (self->trace_flags & TRACE_ETH_FULL) {
flags |= NETUTILS_TRACE_PAYLOAD;
}
netutils_ethernet_trace(MP_PYTHON_PRINTER, len, buf, flags);
}
}
STATIC err_t eth_netif_output(struct netif *netif, struct pbuf *p) {
// This function should always be called from a context where PendSV-level IRQs are disabled
LINK_STATS_INC(link.xmit);
eth_trace(netif->state, (size_t)-1, p, NETUTILS_TRACE_IS_TX | NETUTILS_TRACE_NEWLINE);
uint8_t *buf;
int ret = eth_tx_buf_get(p->tot_len, &buf);
if (ret == 0) {
pbuf_copy_partial(p, buf, p->tot_len, 0);
ret = eth_tx_buf_send();
}
return ret ? ERR_BUF : ERR_OK;
}
STATIC err_t eth_netif_init(struct netif *netif) {
netif->linkoutput = eth_netif_output;
netif->output = etharp_output;
netif->mtu = 1500;
netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET | NETIF_FLAG_IGMP;
// Checksums only need to be checked on incoming frames, not computed on outgoing frames
NETIF_SET_CHECKSUM_CTRL(netif,
NETIF_CHECKSUM_CHECK_IP
| NETIF_CHECKSUM_CHECK_UDP
| NETIF_CHECKSUM_CHECK_TCP
| NETIF_CHECKSUM_CHECK_ICMP
| NETIF_CHECKSUM_CHECK_ICMP6);
return ERR_OK;
}
STATIC void eth_lwip_init(eth_t *self) {
ip_addr_t ipconfig[4];
IP4_ADDR(&ipconfig[0], 0, 0, 0, 0);
IP4_ADDR(&ipconfig[2], 192, 168, 0, 1);
IP4_ADDR(&ipconfig[1], 255, 255, 255, 0);
IP4_ADDR(&ipconfig[3], 8, 8, 8, 8);
MICROPY_PY_LWIP_ENTER
struct netif *n = &self->netif;
n->name[0] = 'e';
n->name[1] = '0';
netif_add(n, &ipconfig[0], &ipconfig[1], &ipconfig[2], self, eth_netif_init, ethernet_input);
netif_set_hostname(n, "MPY");
netif_set_default(n);
netif_set_up(n);
dns_setserver(0, &ipconfig[3]);
dhcp_set_struct(n, &self->dhcp_struct);
dhcp_start(n);
netif_set_link_up(n);
MICROPY_PY_LWIP_EXIT
}
STATIC void eth_lwip_deinit(eth_t *self) {
MICROPY_PY_LWIP_ENTER
for (struct netif *netif = netif_list; netif != NULL; netif = netif->next) {
if (netif == &self->netif) {
netif_remove(netif);
netif->ip_addr.addr = 0;
netif->flags = 0;
}
}
MICROPY_PY_LWIP_EXIT
}
STATIC void eth_process_frame(eth_t *self, size_t len, const uint8_t *buf) {
eth_trace(self, len, buf, NETUTILS_TRACE_NEWLINE);
struct netif *netif = &self->netif;
if (netif->flags & NETIF_FLAG_LINK_UP) {
struct pbuf *p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
if (p != NULL) {
pbuf_take(p, buf, len);
if (netif->input(p, netif) != ERR_OK) {
pbuf_free(p);
}
}
}
}
struct netif *eth_netif(eth_t *self) {
return &self->netif;
}
int eth_link_status(eth_t *self) {
struct netif *netif = &self->netif;
if ((netif->flags & (NETIF_FLAG_UP | NETIF_FLAG_LINK_UP))
== (NETIF_FLAG_UP | NETIF_FLAG_LINK_UP)) {
if (netif->ip_addr.addr != 0) {
return 3; // link up
} else {
return 2; // link no-ip;
}
} else {
int s = eth_phy_read(0) | eth_phy_read(0x10) << 16;
if (s == 0) {
return 0; // link down
} else {
return 1; // link join
}
}
}
int eth_start(eth_t *self) {
eth_lwip_deinit(self);
int ret = eth_mac_init(self);
if (ret < 0) {
return ret;
}
eth_lwip_init(self);
return 0;
}
int eth_stop(eth_t *self) {
eth_lwip_deinit(self);
eth_mac_deinit(self);
return 0;
}
#endif // defined(MICROPY_HW_ETH_MDC)
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