Urvish Patel
fork of lwip-eth for publication
Fork of
lwip-eth
by 
mbed official
Diff: arch/TARGET_STM/stm32f4_emac.c
- Revision:
- 25:ba0a1c5bf54e
diff -r f274b521b211 -r ba0a1c5bf54e arch/TARGET_STM/stm32f4_emac.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/arch/TARGET_STM/stm32f4_emac.c Thu Mar 12 14:31:53 2015 +0000
@@ -0,0 +1,560 @@
+
+#include "stm32f4xx_hal.h"
+#include "lwip/opt.h"
+
+#include "lwip/timers.h"
+#include "netif/etharp.h"
+#include "lwip/tcpip.h"
+#include <string.h>
+#include "cmsis_os.h"
+#include "mbed_interface.h"
+
+/** @defgroup lwipstm32f4xx_emac_DRIVER stm32f4 EMAC driver for LWIP
+ * @ingroup lwip_emac
+ *
+ * @{
+ */
+
+#define RECV_TASK_PRI (osPriorityHigh)
+#define PHY_TASK_PRI (osPriorityLow)
+#define PHY_TASK_WAIT (200)
+
+
+#if defined (__ICCARM__) /*!< IAR Compiler */
+ #pragma data_alignment=4
+#endif
+__ALIGN_BEGIN ETH_DMADescTypeDef DMARxDscrTab[ETH_RXBUFNB] __ALIGN_END; /* Ethernet Rx MA Descriptor */
+
+#if defined (__ICCARM__) /*!< IAR Compiler */
+ #pragma data_alignment=4
+#endif
+__ALIGN_BEGIN ETH_DMADescTypeDef DMATxDscrTab[ETH_TXBUFNB] __ALIGN_END; /* Ethernet Tx DMA Descriptor */
+
+#if defined (__ICCARM__) /*!< IAR Compiler */
+ #pragma data_alignment=4
+#endif
+__ALIGN_BEGIN uint8_t Rx_Buff[ETH_RXBUFNB][ETH_RX_BUF_SIZE] __ALIGN_END; /* Ethernet Receive Buffer */
+
+#if defined (__ICCARM__) /*!< IAR Compiler */
+ #pragma data_alignment=4
+#endif
+__ALIGN_BEGIN uint8_t Tx_Buff[ETH_TXBUFNB][ETH_TX_BUF_SIZE] __ALIGN_END; /* Ethernet Transmit Buffer */
+
+
+ETH_HandleTypeDef heth;
+
+static sys_sem_t rx_ready_sem; /* receive ready semaphore */
+static sys_mutex_t tx_lock_mutex;
+
+/* function */
+static void stm32f4_rx_task(void *arg);
+static void stm32f4_phy_task(void *arg);
+static err_t stm32f4_etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr);
+static err_t stm32f4_low_level_output(struct netif *netif, struct pbuf *p);
+
+/**
+ * Override HAL Eth Init function
+ */
+void HAL_ETH_MspInit(ETH_HandleTypeDef* heth)
+{
+ GPIO_InitTypeDef GPIO_InitStruct;
+ if (heth->Instance == ETH) {
+ /* Peripheral clock enable */
+ __ETH_CLK_ENABLE();
+
+ __GPIOA_CLK_ENABLE();
+ __GPIOB_CLK_ENABLE();
+ __GPIOC_CLK_ENABLE();
+
+ /**ETH GPIO Configuration
+ PC1 ------> ETH_MDC
+ PA1 ------> ETH_REF_CLK
+ PA2 ------> ETH_MDIO
+ PA7 ------> ETH_CRS_DV
+ PC4 ------> ETH_RXD0
+ PC5 ------> ETH_RXD1
+ PB11 ------> ETH_TX_EN
+ PB12 ------> ETH_TXD0
+ PB13 ------> ETH_TXD1
+ */
+ GPIO_InitStruct.Pin = GPIO_PIN_1 | GPIO_PIN_4 | GPIO_PIN_5;
+ GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+ GPIO_InitStruct.Pull = GPIO_NOPULL;
+ GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+ GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
+ HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
+
+ GPIO_InitStruct.Pin = GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_7;
+ GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+ GPIO_InitStruct.Pull = GPIO_NOPULL;
+ GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+ GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
+ HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
+ GPIO_InitStruct.Pin = GPIO_PIN_11 | GPIO_PIN_12 | GPIO_PIN_13;
+ GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+ GPIO_InitStruct.Pull = GPIO_NOPULL;
+ GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+ GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
+ HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+
+ /* Peripheral interrupt init*/
+ /* Sets the priority grouping field */
+ HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
+ HAL_NVIC_SetPriority(ETH_IRQn, 0, 0);
+ HAL_NVIC_EnableIRQ(ETH_IRQn);
+ }
+}
+
+/**
+ * Override HAL Eth DeInit function
+ */
+void HAL_ETH_MspDeInit(ETH_HandleTypeDef* heth)
+{
+ if (heth->Instance == ETH) {
+ /* Peripheral clock disable */
+ __ETH_CLK_DISABLE();
+
+ /**ETH GPIO Configuration
+ PC1 ------> ETH_MDC
+ PA1 ------> ETH_REF_CLK
+ PA2 ------> ETH_MDIO
+ PA7 ------> ETH_CRS_DV
+ PC4 ------> ETH_RXD0
+ PC5 ------> ETH_RXD1
+ PB11 ------> ETH_TX_EN
+ PB12 ------> ETH_TXD0
+ PB13 ------> ETH_TXD1
+ */
+ HAL_GPIO_DeInit(GPIOC, GPIO_PIN_1 | GPIO_PIN_4 | GPIO_PIN_5);
+
+ HAL_GPIO_DeInit(GPIOA, GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_7);
+
+ HAL_GPIO_DeInit(GPIOB, GPIO_PIN_11 | GPIO_PIN_12 | GPIO_PIN_13);
+
+ /* Peripheral interrupt Deinit*/
+ HAL_NVIC_DisableIRQ(ETH_IRQn);
+ }
+}
+
+/**
+ * Ethernet Rx Transfer completed callback
+ *
+ * @param heth: ETH handle
+ * @retval None
+ */
+void HAL_ETH_RxCpltCallback(ETH_HandleTypeDef *heth)
+{
+
+ sys_sem_signal(&rx_ready_sem);
+}
+
+
+/**
+ * Ethernet IRQ Handler
+ *
+ * @param None
+ * @retval None
+ */
+void ETH_IRQHandler(void)
+{
+ HAL_ETH_IRQHandler(&heth);
+}
+
+
+
+/**
+ * In this function, the hardware should be initialized.
+ * Called from eth_arch_enetif_init().
+ *
+ * @param netif the already initialized lwip network interface structure
+ * for this ethernetif
+ */
+static void stm32f4_low_level_init(struct netif *netif)
+{
+ uint32_t regvalue = 0;
+ HAL_StatusTypeDef hal_eth_init_status;
+
+ /* Init ETH */
+ uint8_t MACAddr[6];
+ heth.Instance = ETH;
+ heth.Init.AutoNegotiation = ETH_AUTONEGOTIATION_ENABLE;
+ heth.Init.Speed = ETH_SPEED_10M;
+ heth.Init.DuplexMode = ETH_MODE_FULLDUPLEX;
+ heth.Init.PhyAddress = 1;
+#if (MBED_MAC_ADDRESS_SUM != MBED_MAC_ADDR_INTERFACE)
+ MACAddr[0] = MBED_MAC_ADDR_0;
+ MACAddr[1] = MBED_MAC_ADDR_1;
+ MACAddr[2] = MBED_MAC_ADDR_2;
+ MACAddr[3] = MBED_MAC_ADDR_3;
+ MACAddr[4] = MBED_MAC_ADDR_4;
+ MACAddr[5] = MBED_MAC_ADDR_5;
+#else
+ mbed_mac_address((char *)MACAddr);
+#endif
+ heth.Init.MACAddr = &MACAddr[0];
+ heth.Init.RxMode = ETH_RXINTERRUPT_MODE;
+ heth.Init.ChecksumMode = ETH_CHECKSUM_BY_HARDWARE;
+ heth.Init.MediaInterface = ETH_MEDIA_INTERFACE_RMII;
+ hal_eth_init_status = HAL_ETH_Init(&heth);
+
+ if (hal_eth_init_status == HAL_OK) {
+ /* Set netif link flag */
+ netif->flags |= NETIF_FLAG_LINK_UP;
+ }
+
+ /* Initialize Tx Descriptors list: Chain Mode */
+ HAL_ETH_DMATxDescListInit(&heth, DMATxDscrTab, &Tx_Buff[0][0], ETH_TXBUFNB);
+
+ /* Initialize Rx Descriptors list: Chain Mode */
+ HAL_ETH_DMARxDescListInit(&heth, DMARxDscrTab, &Rx_Buff[0][0], ETH_RXBUFNB);
+
+ #if LWIP_ARP || LWIP_ETHERNET
+ /* set MAC hardware address length */
+ netif->hwaddr_len = ETHARP_HWADDR_LEN;
+
+ /* set MAC hardware address */
+ netif->hwaddr[0] = heth.Init.MACAddr[0];
+ netif->hwaddr[1] = heth.Init.MACAddr[1];
+ netif->hwaddr[2] = heth.Init.MACAddr[2];
+ netif->hwaddr[3] = heth.Init.MACAddr[3];
+ netif->hwaddr[4] = heth.Init.MACAddr[4];
+ netif->hwaddr[5] = heth.Init.MACAddr[5];
+
+ /* maximum transfer unit */
+ netif->mtu = 1500;
+
+ /* device capabilities */
+ /* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */
+ netif->flags |= NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP;
+
+ /* Enable MAC and DMA transmission and reception */
+ HAL_ETH_Start(&heth);
+
+ /**** Configure PHY to generate an interrupt when Eth Link state changes ****/
+ /* Read Register Configuration */
+ HAL_ETH_ReadPHYRegister(&heth, PHY_MICR, ®value);
+
+ regvalue |= (PHY_MICR_INT_EN | PHY_MICR_INT_OE);
+
+ /* Enable Interrupts */
+ HAL_ETH_WritePHYRegister(&heth, PHY_MICR, regvalue);
+
+ /* Read Register Configuration */
+ HAL_ETH_ReadPHYRegister(&heth, PHY_MISR, ®value);
+
+ regvalue |= PHY_MISR_LINK_INT_EN;
+
+ /* Enable Interrupt on change of link status */
+ HAL_ETH_WritePHYRegister(&heth, PHY_MISR, regvalue);
+#endif
+}
+
+/**
+ * This function should do the actual transmission of the packet. The packet is
+ * contained in the pbuf that is passed to the function. This pbuf
+ * might be chained.
+ *
+ * @param netif the lwip network interface structure for this ethernetif
+ * @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)
+ * @return ERR_OK if the packet could be sent
+ * an err_t value if the packet couldn't be sent
+ *
+ * @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to
+ * strange results. You might consider waiting for space in the DMA queue
+ * to become availale since the stack doesn't retry to send a packet
+ * dropped because of memory failure (except for the TCP timers).
+ */
+
+static err_t stm32f4_low_level_output(struct netif *netif, struct pbuf *p)
+{
+ err_t errval;
+ struct pbuf *q;
+ uint8_t *buffer = (uint8_t*)(heth.TxDesc->Buffer1Addr);
+ __IO ETH_DMADescTypeDef *DmaTxDesc;
+ uint32_t framelength = 0;
+ uint32_t bufferoffset = 0;
+ uint32_t byteslefttocopy = 0;
+ uint32_t payloadoffset = 0;
+ DmaTxDesc = heth.TxDesc;
+ bufferoffset = 0;
+
+
+ sys_mutex_lock(&tx_lock_mutex);
+
+ /* copy frame from pbufs to driver buffers */
+ for (q = p; q != NULL; q = q->next) {
+ /* Is this buffer available? If not, goto error */
+ if ((DmaTxDesc->Status & ETH_DMATXDESC_OWN) != (uint32_t)RESET) {
+ errval = ERR_USE;
+ goto error;
+ }
+
+ /* Get bytes in current lwIP buffer */
+ byteslefttocopy = q->len;
+ payloadoffset = 0;
+
+ /* Check if the length of data to copy is bigger than Tx buffer size*/
+ while ((byteslefttocopy + bufferoffset) > ETH_TX_BUF_SIZE) {
+ /* Copy data to Tx buffer*/
+ memcpy((uint8_t*)((uint8_t*)buffer + bufferoffset), (uint8_t*)((uint8_t*)q->payload + payloadoffset), (ETH_TX_BUF_SIZE - bufferoffset));
+
+ /* Point to next descriptor */
+ DmaTxDesc = (ETH_DMADescTypeDef*)(DmaTxDesc->Buffer2NextDescAddr);
+
+ /* Check if the buffer is available */
+ if ((DmaTxDesc->Status & ETH_DMATXDESC_OWN) != (uint32_t)RESET) {
+ errval = ERR_USE;
+ goto error;
+ }
+
+ buffer = (uint8_t*)(DmaTxDesc->Buffer1Addr);
+
+ byteslefttocopy = byteslefttocopy - (ETH_TX_BUF_SIZE - bufferoffset);
+ payloadoffset = payloadoffset + (ETH_TX_BUF_SIZE - bufferoffset);
+ framelength = framelength + (ETH_TX_BUF_SIZE - bufferoffset);
+ bufferoffset = 0;
+ }
+
+ /* Copy the remaining bytes */
+ memcpy((uint8_t*)((uint8_t*)buffer + bufferoffset), (uint8_t*)((uint8_t*)q->payload + payloadoffset), byteslefttocopy);
+ bufferoffset = bufferoffset + byteslefttocopy;
+ framelength = framelength + byteslefttocopy;
+ }
+
+ /* Prepare transmit descriptors to give to DMA */
+ HAL_ETH_TransmitFrame(&heth, framelength);
+
+ errval = ERR_OK;
+
+error:
+
+ /* When Transmit Underflow flag is set, clear it and issue a Transmit Poll Demand to resume transmission */
+ if ((heth.Instance->DMASR & ETH_DMASR_TUS) != (uint32_t)RESET) {
+ /* Clear TUS ETHERNET DMA flag */
+ heth.Instance->DMASR = ETH_DMASR_TUS;
+
+ /* Resume DMA transmission*/
+ heth.Instance->DMATPDR = 0;
+ }
+
+ sys_mutex_unlock(&tx_lock_mutex);
+
+ return errval;
+}
+
+
+/**
+ * Should allocate a pbuf and transfer the bytes of the incoming
+ * packet from the interface into the pbuf.
+ *
+ * @param netif the lwip network interface structure for this ethernetif
+ * @return a pbuf filled with the received packet (including MAC header)
+ * NULL on memory error
+ */
+static struct pbuf * stm32f4_low_level_input(struct netif *netif)
+{
+ struct pbuf *p = NULL;
+ struct pbuf *q;
+ uint16_t len = 0;
+ uint8_t *buffer;
+ __IO ETH_DMADescTypeDef *dmarxdesc;
+ uint32_t bufferoffset = 0;
+ uint32_t payloadoffset = 0;
+ uint32_t byteslefttocopy = 0;
+ uint32_t i = 0;
+
+
+ /* get received frame */
+ if (HAL_ETH_GetReceivedFrame(&heth) != HAL_OK)
+ return NULL;
+
+ /* Obtain the size of the packet and put it into the "len" variable. */
+ len = heth.RxFrameInfos.length;
+ buffer = (uint8_t*)heth.RxFrameInfos.buffer;
+
+ if (len > 0) {
+ /* We allocate a pbuf chain of pbufs from the Lwip buffer pool */
+ p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
+ }
+
+ if (p != NULL) {
+ dmarxdesc = heth.RxFrameInfos.FSRxDesc;
+ bufferoffset = 0;
+ for (q = p; q != NULL; q = q->next) {
+ byteslefttocopy = q->len;
+ payloadoffset = 0;
+
+ /* Check if the length of bytes to copy in current pbuf is bigger than Rx buffer size*/
+ while ((byteslefttocopy + bufferoffset) > ETH_RX_BUF_SIZE) {
+ /* Copy data to pbuf */
+ memcpy((uint8_t*)((uint8_t*)q->payload + payloadoffset), (uint8_t*)((uint8_t*)buffer + bufferoffset), (ETH_RX_BUF_SIZE - bufferoffset));
+
+ /* Point to next descriptor */
+ dmarxdesc = (ETH_DMADescTypeDef*)(dmarxdesc->Buffer2NextDescAddr);
+ buffer = (uint8_t*)(dmarxdesc->Buffer1Addr);
+
+ byteslefttocopy = byteslefttocopy - (ETH_RX_BUF_SIZE - bufferoffset);
+ payloadoffset = payloadoffset + (ETH_RX_BUF_SIZE - bufferoffset);
+ bufferoffset = 0;
+ }
+ /* Copy remaining data in pbuf */
+ memcpy((uint8_t*)((uint8_t*)q->payload + payloadoffset), (uint8_t*)((uint8_t*)buffer + bufferoffset), byteslefttocopy);
+ bufferoffset = bufferoffset + byteslefttocopy;
+ }
+
+ /* Release descriptors to DMA */
+ /* Point to first descriptor */
+ dmarxdesc = heth.RxFrameInfos.FSRxDesc;
+ /* Set Own bit in Rx descriptors: gives the buffers back to DMA */
+ for (i = 0; i < heth.RxFrameInfos.SegCount; i++) {
+ dmarxdesc->Status |= ETH_DMARXDESC_OWN;
+ dmarxdesc = (ETH_DMADescTypeDef*)(dmarxdesc->Buffer2NextDescAddr);
+ }
+
+ /* Clear Segment_Count */
+ heth.RxFrameInfos.SegCount = 0;
+ }
+
+ /* When Rx Buffer unavailable flag is set: clear it and resume reception */
+ if ((heth.Instance->DMASR & ETH_DMASR_RBUS) != (uint32_t)RESET) {
+ /* Clear RBUS ETHERNET DMA flag */
+ heth.Instance->DMASR = ETH_DMASR_RBUS;
+ /* Resume DMA reception */
+ heth.Instance->DMARPDR = 0;
+ }
+ return p;
+}
+
+/**
+ * This task receives input data
+ *
+ * \param[in] netif the lwip network interface structure
+ */
+static void stm32f4_rx_task(void *arg)
+{
+ struct netif *netif = (struct netif*)arg;
+ struct pbuf *p;
+
+ while (1) {
+ sys_arch_sem_wait(&rx_ready_sem, 0);
+ p = stm32f4_low_level_input(netif);
+ if (p != NULL) {
+ if (netif->input(p, netif) != ERR_OK) {
+ pbuf_free(p);
+ p = NULL;
+ }
+ }
+ }
+}
+
+/**
+ * This task checks phy link status and updates net status
+ *
+ * \param[in] netif the lwip network interface structure
+ */
+static void stm32f4_phy_task(void *arg)
+{
+ struct netif *netif = (struct netif*)arg;
+ uint32_t phy_status = 0;
+
+ while (1) {
+ uint32_t status;
+ if (HAL_ETH_ReadPHYRegister(&heth, PHY_SR, &status) == HAL_OK) {
+ if ((status & PHY_LINK_STATUS) && !(phy_status & PHY_LINK_STATUS)) {
+ tcpip_callback_with_block((tcpip_callback_fn)netif_set_link_up, (void*) netif, 1);
+ } else if (!(status & PHY_LINK_STATUS) && (phy_status & PHY_LINK_STATUS)) {
+ tcpip_callback_with_block((tcpip_callback_fn)netif_set_link_down, (void*) netif, 1);
+ }
+
+ phy_status = status;
+ }
+
+ osDelay(PHY_TASK_WAIT);
+ }
+}
+
+/**
+ * This function is the ethernet packet send function. It calls
+ * etharp_output after checking link status.
+ *
+ * \param[in] netif the lwip network interface structure for this lpc_enetif
+ * \param[in] q Pointer to pbug to send
+ * \param[in] ipaddr IP address
+ * \return ERR_OK or error code
+ */
+static err_t stm32f4_etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr)
+{
+ /* Only send packet is link is up */
+ if (netif->flags & NETIF_FLAG_LINK_UP) {
+ return etharp_output(netif, q, ipaddr);
+ }
+
+ return ERR_CONN;
+}
+
+/**
+ * Should be called at the beginning of the program to set up the
+ * network interface.
+ *
+ * This function should be passed as a parameter to netif_add().
+ *
+ * @param[in] netif the lwip network interface structure for this lpc_enetif
+ * @return ERR_OK if the loopif is initialized
+ * ERR_MEM if private data couldn't be allocated
+ * any other err_t on error
+ */
+err_t eth_arch_enetif_init(struct netif *netif)
+{
+ /* set MAC hardware address */
+ netif->hwaddr_len = ETHARP_HWADDR_LEN;
+
+ /* maximum transfer unit */
+ netif->mtu = 1500;
+
+ /* device capabilities */
+ netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET | NETIF_FLAG_IGMP;
+
+#if LWIP_NETIF_HOSTNAME
+ /* Initialize interface hostname */
+ netif->hostname = "lwipstm32f4";
+#endif /* LWIP_NETIF_HOSTNAME */
+
+ netif->name[0] = 'e';
+ netif->name[1] = 'n';
+
+ netif->output = stm32f4_etharp_output;
+ netif->linkoutput = stm32f4_low_level_output;
+
+ /* semaphore */
+ sys_sem_new(&rx_ready_sem, 0);
+
+ sys_mutex_new(&tx_lock_mutex);
+
+ /* task */
+ sys_thread_new("stm32f4_recv_task", stm32f4_rx_task, netif, DEFAULT_THREAD_STACKSIZE, RECV_TASK_PRI);
+ sys_thread_new("stm32f4_phy_task", stm32f4_phy_task, netif, DEFAULT_THREAD_STACKSIZE, PHY_TASK_PRI);
+
+ /* initialize the hardware */
+ stm32f4_low_level_init(netif);
+
+ return ERR_OK;
+}
+
+void eth_arch_enable_interrupts(void)
+{
+ HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
+ HAL_NVIC_SetPriority(ETH_IRQn, 0, 0);
+ HAL_NVIC_EnableIRQ(ETH_IRQn);
+}
+
+void eth_arch_disable_interrupts(void)
+{
+ NVIC_DisableIRQ(ETH_IRQn);
+}
+
+/**
+ * @}
+ */
+
+/* --------------------------------- End Of File ------------------------------ */