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lpc17 EMAC driver for LWIP
Functions | Variables

lpc17 EMAC driver for LWIP

Functions

void lpc_mii_write_noblock (u32_t PhyReg, u32_t Value)
 Write a value via the MII link (non-blocking)
err_t lpc_mii_write (u32_t PhyReg, u32_t Value)
 Write a value via the MII link (blocking)
u32_t lpc_mii_is_busy (void)
 Reads current MII link busy status.
u32_t lpc_mii_read_data (void)
 Starts a read operation via the MII link (non-blocking)
void lpc_mii_read_noblock (u32_t PhyReg)
 Read a value via the MII link (blocking)
err_t lpc_mii_read (u32_t PhyReg, u32_t *data)
 Starts a read operation via the MII link (non-blocking)
static void lpc_rxqueue_pbuf (struct lpc_enetdata *lpc_enetif, struct pbuf *p)
 Queues a pbuf into the RX descriptor list.
s32_t lpc_rx_queue (struct netif *netif)
 Attempt to allocate and requeue a new pbuf for RX.
static err_t lpc_rx_setup (struct lpc_enetdata *lpc_enetif)
 Sets up the RX descriptor ring buffers.
static struct pbuf * lpc_low_level_input (struct netif *netif)
 Allocates a pbuf and returns the data from the incoming packet.
void lpc_enetif_input (struct netif *netif)
 Attempt to read a packet from the EMAC interface.
static s32_t lpc_packet_addr_notsafe (void *addr)
 Determine if the passed address is usable for the ethernet DMA controller.

Variables

ETHMEM_SECTION struct lpc_enetdata lpc_enetdata
 LPC EMAC driver work data.

Function Documentation

void lpc_enetif_input ( struct netif *  netif )

Attempt to read a packet from the EMAC interface.

Parameters:
[in]netifthe lwip network interface structure for this lpc_enetif

Definition at line 488 of file lpc17_emac.c.

static struct pbuf* lpc_low_level_input ( struct netif *  netif ) [static, read]

Allocates a pbuf and returns the data from the incoming packet.

Parameters:
[in]netifthe lwip network interface structure for this lpc_enetif
Returns:
a pbuf filled with the received packet (including MAC header) NULL on memory error

Definition at line 348 of file lpc17_emac.c.

u32_t lpc_mii_is_busy ( void   )

Reads current MII link busy status.

This function will return the current MII link busy status and is meant to be used with non-blocking functions for monitor PHY status such as connection state.

Returns:
!0 if the MII link is busy, otherwise 0

Definition at line 194 of file lpc17_emac.c.

err_t lpc_mii_read ( u32_t  PhyReg,
u32_t *  data 
)

Starts a read operation via the MII link (non-blocking)

This function will start a read operation on the MII link interface from a PHY or a connected device. The function will not block and the status mist be polled until complete. Once complete, the data can be read.

Parameters:
[in]PhyRegPHY register to read from

Definition at line 217 of file lpc17_emac.c.

u32_t lpc_mii_read_data ( void   )

Starts a read operation via the MII link (non-blocking)

This function returns the current value in the MII data register. It is meant to be used with the non-blocking oeprations. This value should only be read after a non-block read command has been issued and the MII status has been determined to be good.

Returns:
The current value in the MII value register

Definition at line 200 of file lpc17_emac.c.

void lpc_mii_read_noblock ( u32_t  PhyReg )

Read a value via the MII link (blocking)

This function will read a value on the MII link interface from a PHY or a connected device. The function will block until complete.

Parameters:
[in]PhyRegPHY register to read from
[in]dataPointer to where to save data read via MII
Returns:
0 if the read was successful, otherwise !0

Definition at line 209 of file lpc17_emac.c.

err_t lpc_mii_write ( u32_t  PhyReg,
u32_t  Value 
)

Write a value via the MII link (blocking)

This function will write a value on the MII link interface to a PHY or a connected device. The function will block until complete.

Parameters:
[in]PhyRegPHY register to write to
[in]ValueValue to write
Returns:
0 if the write was successful, otherwise !0

Definition at line 168 of file lpc17_emac.c.

void lpc_mii_write_noblock ( u32_t  PhyReg,
u32_t  Value 
)

Write a value via the MII link (non-blocking)

This function will write a value on the MII link interface to a PHY or a connected device. The function will return immediately without a status. Status needs to be polled later to determine if the write was successful.

Parameters:
[in]PhyRegPHY register to write to
[in]ValueValue to write

Definition at line 160 of file lpc17_emac.c.

static s32_t lpc_packet_addr_notsafe ( void *  addr ) [static]

Determine if the passed address is usable for the ethernet DMA controller.

Parameters:
[in]addrAddress of packet to check for DMA safe operation
Returns:
1 if the packet address is not safe, otherwise 0

Sets up the TX descriptor ring buffers.

This function sets up the descriptor list used for transmit packets.

Parameters:
[in]lpc_enetifPointer to driver data structure

Free TX buffers that are complete

Parameters:
[in]lpc_enetifPointer to driver data structure
[in]cidxEMAC current descriptor comsumer index

User call for freeingTX buffers that are complete

Parameters:
[in]netifthe lwip network interface structure for this lpc_enetif

Polls if an available TX descriptor is ready. Can be used to determine if the low level transmit function will block.

Parameters:
[in]netifthe lwip network interface structure for this lpc_enetif
Returns:
0 if no descriptors are read, or >0

Low level output of a packet. Never call this from an interrupt context, as it may block until TX descriptors become available.

Parameters:
[in]netifthe lwip network interface structure for this lpc_enetif
[in]pthe MAC packet to send (e.g. IP packet including MAC addresses and type)
Returns:
ERR_OK if the packet could be sent or an err_t value if the packet couldn't be sent

LPC EMAC interrupt handler.

This function handles the transmit, receive, and error interrupt of the LPC177x_8x. This is meant to be used when NO_SYS=0.

Packet reception task

This task is called when a packet is received. It will pass the packet to the LWIP core.

Parameters:
[in]pvParametersNot used yet

Transmit cleanup task

This task is called when a transmit interrupt occurs and reclaims the pbuf and descriptor used for the packet once the packet has been transferred.

Parameters:
[in]pvParametersNot used yet

Low level init of the MAC and PHY.

Parameters:
[in]netifPointer to LWIP netif structure

This function is the ethernet packet send function. It calls etharp_output after checking link status.

Parameters:
[in]netifthe lwip network interface structure for this lpc_enetif
[in]qPointer to pbug to send
[in]ipaddrIP address
Returns:
ERR_OK or error code

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().

Parameters:
[in]netifthe lwip network interface structure for this lpc_enetif
Returns:
ERR_OK if the loopif is initialized ERR_MEM if private data couldn't be allocated any other err_t on error

Definition at line 529 of file lpc17_emac.c.

s32_t lpc_rx_queue ( struct netif *  netif )

Attempt to allocate and requeue a new pbuf for RX.

Parameters:
[in]netifPointer to the netif structure
Returns:
1 if a packet was allocated and requeued, otherwise 0

Definition at line 286 of file lpc17_emac.c.

static err_t lpc_rx_setup ( struct lpc_enetdata *  lpc_enetif ) [static]

Sets up the RX descriptor ring buffers.

This function sets up the descriptor list used for receive packets.

Parameters:
[in]lpc_enetifPointer to driver data structure
Returns:
Always returns ERR_OK

Definition at line 326 of file lpc17_emac.c.

static void lpc_rxqueue_pbuf ( struct lpc_enetdata *  lpc_enetif,
struct pbuf *  p 
) [static]

Queues a pbuf into the RX descriptor list.

Parameters:
[in]lpc_enetifPointer to the drvier data structure
[in]pPointer to pbuf to queue

Definition at line 250 of file lpc17_emac.c.

Variable Documentation

ETHMEM_SECTION struct lpc_enetdata lpc_enetdata

LPC EMAC driver work data.

Definition at line 157 of file lpc17_emac.c.

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