/* * 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 #include "py/mphal.h" #include "py/mperrno.h" #include "lib/netutils/netutils.h" #include "lwip/etharp.h" #include "lwip/dns.h" #include "lwip/dhcp.h" #include "netif/ethernet.h" #include "pin_static_af.h" #include "modnetwork.h" #include "eth.h" #if defined(MICROPY_HW_ETH_MDC) // 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 { mod_network_nic_type_t base; 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; } STATIC void mpu_config(uint32_t region, uint32_t base_addr, uint32_t size) { __DMB(); // Disable MPU SCB->SHCSR &= ~SCB_SHCSR_MEMFAULTENA_Msk; MPU->CTRL = 0; // Config MPU region MPU->RNR = region; MPU->RBAR = base_addr; MPU->RASR = MPU_INSTRUCTION_ACCESS_DISABLE << MPU_RASR_XN_Pos | MPU_REGION_FULL_ACCESS << MPU_RASR_AP_Pos | MPU_TEX_LEVEL1 << MPU_RASR_TEX_Pos | MPU_ACCESS_SHAREABLE << MPU_RASR_S_Pos | MPU_ACCESS_NOT_CACHEABLE << MPU_RASR_C_Pos | MPU_ACCESS_NOT_BUFFERABLE << MPU_RASR_B_Pos | 0x00 << MPU_RASR_SRD_Pos | size << MPU_RASR_SIZE_Pos | MPU_REGION_ENABLE << MPU_RASR_ENABLE_Pos; // Enable MPU MPU->CTRL = MPU_PRIVILEGED_DEFAULT | MPU_CTRL_ENABLE_Msk; SCB->SHCSR |= SCB_SHCSR_MEMFAULTENA_Msk; __DSB(); __ISB(); } 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 mpu_config(MPU_REGION_NUMBER0, (uint32_t)ð_dma, MPU_REGION_SIZE_16KB); // 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)ð_dma.rx_buf[i * RX_BUF_SIZE]; eth_dma.rx_descr[i].rdes3 = (uint32_t)ð_dma.rx_descr[(i + 1) % RX_BUF_NUM]; } ETH->DMARDLAR = (uint32_t)ð_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)ð_dma.tx_descr[(i + 1) % TX_BUF_NUM]; } ETH->DMATDLAR = (uint32_t)ð_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 = ð_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 = ð_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)ð_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 = ð_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 = ð_dma.rx_descr[eth_dma.rx_descr_idx]; uint8_t *buf = ð_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)ð_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 = ð_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(ð_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)