| CMSIS-Driver Version 2.02 Peripheral Interface for Middleware and Application Code

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Ethernet MAC Interface
Ethernet Interface

Driver API for Ethernet MAC Peripheral (Driver_ETH_MAC.h) More...

## Content
| Ethernet MAC Events
| The Ethernet MAC driver generates call back events that are notified via the function ARM_ETH_MAC_SignalEvent.
| Ethernet MAC Control Codes
| Configure and control the Ethernet MAC using the ARM_ETH_MAC_Control.
| Ethernet MAC Timer Control Codes
| Control codes for ARM_ETH_MAC_ControlTimer function.
| Ethernet MAC Frame Transmit Flags
| Specify frame transmit flags.

## Data Structures
struct | ARM_ETH_MAC_CAPABILITIES
| Ethernet MAC Capabilities. More...
struct | ARM_DRIVER_ETH_MAC
| Access structure of the Ethernet MAC Driver. More...
struct | ARM_ETH_MAC_TIME
| Ethernet MAC Time. More...

## Typedefs
typedef void(* | ARM_ETH_MAC_SignalEvent_t )(uint32_t event)
| Pointer to ARM_ETH_MAC_SignalEvent : Signal Ethernet Event.

## Functions
ARM_DRIVER_VERSION | ARM_ETH_MAC_GetVersion (void)
| Get driver version.
ARM_ETH_MAC_CAPABILITIES | ARM_ETH_MAC_GetCapabilities (void)
| Get driver capabilities.
int32_t | ARM_ETH_MAC_Initialize (ARM_ETH_MAC_SignalEvent_t cb_event)
| Initialize Ethernet MAC Device.
int32_t | ARM_ETH_MAC_Uninitialize (void)
| De-initialize Ethernet MAC Device.
int32_t | ARM_ETH_MAC_PowerControl (ARM_POWER_STATE state)
| Control Ethernet MAC Device Power.
int32_t | ARM_ETH_MAC_GetMacAddress (ARM_ETH_MAC_ADDR *ptr_addr)
| Get Ethernet MAC Address.
int32_t | ARM_ETH_MAC_SetMacAddress (const ARM_ETH_MAC_ADDR *ptr_addr)
| Set Ethernet MAC Address.
int32_t | ARM_ETH_MAC_SetAddressFilter (const ARM_ETH_MAC_ADDR *ptr_addr, uint32_t num_addr)
| Configure Address Filter.
int32_t | ARM_ETH_MAC_SendFrame (const uint8_t *frame, uint32_t len, uint32_t flags)
| Send Ethernet frame.
int32_t | ARM_ETH_MAC_ReadFrame (uint8_t *frame, uint32_t len)
| Read data of received Ethernet frame.
uint32_t | ARM_ETH_MAC_GetRxFrameSize (void)
| Get size of received Ethernet frame.
int32_t | ARM_ETH_MAC_GetRxFrameTime (ARM_ETH_MAC_TIME *time)
| Get time of received Ethernet frame.
int32_t | ARM_ETH_MAC_GetTxFrameTime (ARM_ETH_MAC_TIME *time)
| Get time of transmitted Ethernet frame.
int32_t | ARM_ETH_MAC_Control (uint32_t control, uint32_t arg)
| Control Ethernet Interface.
int32_t | ARM_ETH_MAC_ControlTimer (uint32_t control, ARM_ETH_MAC_TIME *time)
| Control Precision Timer.
int32_t | ARM_ETH_MAC_PHY_Read (uint8_t phy_addr, uint8_t reg_addr, uint16_t *data)
| Read Ethernet PHY Register through Management Interface.
int32_t | ARM_ETH_MAC_PHY_Write (uint8_t phy_addr, uint8_t reg_addr, uint16_t data)
| Write Ethernet PHY Register through Management Interface.
void | ARM_ETH_MAC_SignalEvent (uint32_t event)
| Callback function that signals a Ethernet Event.

## Description

Driver API for Ethernet MAC Peripheral (Driver_ETH_MAC.h)

The following section describes the Ethernet MAC Interface as defined in the Driver_ETH_MAC.h header file.

## Data Structure Documentation

struct ARM_ETH_MAC_CAPABILITIES

Ethernet MAC Capabilities.

An Ethernet MAC driver can be implemented with different capabilities. The bitfield members of this struct encode the capabilities implemented by this driver.

Returned by:

- ARM_ETH_MAC_GetCapabilities

Data Fields
uint32_t | checksum_offload_rx_icmp: 1 | 1 = ICMP payload checksum verified on receive
uint32_t | checksum_offload_rx_ip4: 1 | 1 = IPv4 header checksum verified on receive
uint32_t | checksum_offload_rx_ip6: 1 | 1 = IPv6 checksum verification supported on receive
uint32_t | checksum_offload_rx_tcp: 1 | 1 = TCP payload checksum verified on receive
uint32_t | checksum_offload_rx_udp: 1 | 1 = UDP payload checksum verified on receive
uint32_t | checksum_offload_tx_icmp: 1 | 1 = ICMP payload checksum generated on transmit
uint32_t | checksum_offload_tx_ip4: 1 | 1 = IPv4 header checksum generated on transmit
uint32_t | checksum_offload_tx_ip6: 1 | 1 = IPv6 checksum generation supported on transmit
uint32_t | checksum_offload_tx_tcp: 1 | 1 = TCP payload checksum generated on transmit
uint32_t | checksum_offload_tx_udp: 1 | 1 = UDP payload checksum generated on transmit
uint32_t | event_rx_frame: 1 | 1 = callback event ARM_ETH_MAC_EVENT_RX_FRAME generated
uint32_t | event_tx_frame: 1 | 1 = callback event ARM_ETH_MAC_EVENT_TX_FRAME generated
uint32_t | event_wakeup: 1 | 1 = wakeup event ARM_ETH_MAC_EVENT_WAKEUP generated
uint32_t | mac_address: 1 | 1 = driver provides serialized MAC address
uint32_t | media_interface: 2 | Ethernet Media Interface type.
uint32_t | precision_timer: 1 | 1 = Precision Timer supported

struct ARM_DRIVER_ETH_MAC

Access structure of the Ethernet MAC Driver.

The functions of the Ethernet MAC are accessed by function pointers. Refer to Driver Functions for overview information.

Each instance of an Ethernet MAC provides such an access struct. The instance is indicated by a postfix in the symbol name of the access struct, for example:

- Driver_ETH_MAC0 is the name of the access struct of the first instance (no. 0).
- Driver_ETH_MAC1 is the name of the access struct of the second instance (no. 1).

A configuration setting in the middleware allows connecting the middleware to a specific driver instance Driver_ETH_MACn. The default is 0, which connects a middleware to the first instance of a driver.

### Data Fields
ARM_DRIVER_VERSION(* | GetVersion )(void)
| Pointer to ARM_ETH_MAC_GetVersion : Get driver version.
ARM_ETH_MAC_CAPABILITIES(* | GetCapabilities )(void)
| Pointer to ARM_ETH_MAC_GetCapabilities : Get driver capabilities.
int32_t(* | Initialize )(ARM_ETH_MAC_SignalEvent_t cb_event)
| Pointer to ARM_ETH_MAC_Initialize : Initialize Ethernet MAC Device.
int32_t(* | Uninitialize )(void)
| Pointer to ARM_ETH_MAC_Uninitialize : De-initialize Ethernet MAC Device.
int32_t(* | PowerControl )(ARM_POWER_STATE state)
| Pointer to ARM_ETH_MAC_PowerControl : Control Ethernet MAC Device Power.
int32_t(* | GetMacAddress )(ARM_ETH_MAC_ADDR *ptr_addr)
| Pointer to ARM_ETH_MAC_GetMacAddress : Get Ethernet MAC Address.
int32_t(* | SetMacAddress )(const ARM_ETH_MAC_ADDR *ptr_addr)
| Pointer to ARM_ETH_MAC_SetMacAddress : Set Ethernet MAC Address.
int32_t(* | SetAddressFilter )(const ARM_ETH_MAC_ADDR *ptr_addr, uint32_t num_addr)
| Pointer to ARM_ETH_MAC_SetAddressFilter : Configure Address Filter.
int32_t(* | SendFrame )(const uint8_t *frame, uint32_t len, uint32_t flags)
| Pointer to ARM_ETH_MAC_SendFrame : Send Ethernet frame.
int32_t(* | ReadFrame )(uint8_t *frame, uint32_t len)
| Pointer to ARM_ETH_MAC_ReadFrame : Read data of received Ethernet frame.
uint32_t(* | GetRxFrameSize )(void)
| Pointer to ARM_ETH_MAC_GetRxFrameSize : Get size of received Ethernet frame.
int32_t(* | GetRxFrameTime )(ARM_ETH_MAC_TIME *time)
| Pointer to ARM_ETH_MAC_GetRxFrameTime : Get time of received Ethernet frame.
int32_t(* | GetTxFrameTime )(ARM_ETH_MAC_TIME *time)
| Pointer to ARM_ETH_MAC_GetTxFrameTime : Get time of transmitted Ethernet frame.
int32_t(* | ControlTimer )(uint32_t control, ARM_ETH_MAC_TIME *time)
| Pointer to ARM_ETH_MAC_ControlTimer : Control Precision Timer.
int32_t(* | Control )(uint32_t control, uint32_t arg)
| Pointer to ARM_ETH_MAC_Control : Control Ethernet Interface.
int32_t(* | PHY_Read )(uint8_t phy_addr, uint8_t reg_addr, uint16_t *data)
| Pointer to ARM_ETH_MAC_PHY_Read : Read Ethernet PHY Register through Management Interface.
int32_t(* | PHY_Write )(uint8_t phy_addr, uint8_t reg_addr, uint16_t data)
| Pointer to ARM_ETH_MAC_PHY_Write : Write Ethernet PHY Register through Management Interface.

#### Field Documentation

int32_t(* Control)(uint32_t control, uint32_t arg)

Pointer to ARM_ETH_MAC_Control : Control Ethernet Interface.

int32_t(* ControlTimer)(uint32_t control, ARM_ETH_MAC_TIME *time)

Pointer to ARM_ETH_MAC_ControlTimer : Control Precision Timer.

ARM_ETH_MAC_CAPABILITIES(* GetCapabilities)(void)

Pointer to ARM_ETH_MAC_GetCapabilities : Get driver capabilities.

int32_t(* GetMacAddress)(ARM_ETH_MAC_ADDR *ptr_addr)

Pointer to ARM_ETH_MAC_GetMacAddress : Get Ethernet MAC Address.

uint32_t(* GetRxFrameSize)(void)

Pointer to ARM_ETH_MAC_GetRxFrameSize : Get size of received Ethernet frame.

int32_t(* GetRxFrameTime)(ARM_ETH_MAC_TIME *time)

Pointer to ARM_ETH_MAC_GetRxFrameTime : Get time of received Ethernet frame.

int32_t(* GetTxFrameTime)(ARM_ETH_MAC_TIME *time)

Pointer to ARM_ETH_MAC_GetTxFrameTime : Get time of transmitted Ethernet frame.

ARM_DRIVER_VERSION(* GetVersion)(void)

Pointer to ARM_ETH_MAC_GetVersion : Get driver version.

int32_t(* Initialize)(ARM_ETH_MAC_SignalEvent_t cb_event)

Pointer to ARM_ETH_MAC_Initialize : Initialize Ethernet MAC Device.

int32_t(* PHY_Read)(uint8_t phy_addr, uint8_t reg_addr, uint16_t *data)

Pointer to ARM_ETH_MAC_PHY_Read : Read Ethernet PHY Register through Management Interface.

int32_t(* PHY_Write)(uint8_t phy_addr, uint8_t reg_addr, uint16_t data)

Pointer to ARM_ETH_MAC_PHY_Write : Write Ethernet PHY Register through Management Interface.

int32_t(* PowerControl)(ARM_POWER_STATE state)

Pointer to ARM_ETH_MAC_PowerControl : Control Ethernet MAC Device Power.

int32_t(* ReadFrame)(uint8_t *frame, uint32_t len)

Pointer to ARM_ETH_MAC_ReadFrame : Read data of received Ethernet frame.

int32_t(* SendFrame)(const uint8_t *frame, uint32_t len, uint32_t flags)

Pointer to ARM_ETH_MAC_SendFrame : Send Ethernet frame.

int32_t(* SetAddressFilter)(const ARM_ETH_MAC_ADDR *ptr_addr, uint32_t num_addr)

Pointer to ARM_ETH_MAC_SetAddressFilter : Configure Address Filter.

int32_t(* SetMacAddress)(const ARM_ETH_MAC_ADDR *ptr_addr)

Pointer to ARM_ETH_MAC_SetMacAddress : Set Ethernet MAC Address.

int32_t(* Uninitialize)(void)

Pointer to ARM_ETH_MAC_Uninitialize : De-initialize Ethernet MAC Device.

struct ARM_ETH_MAC_TIME

Ethernet MAC Time.

The two members of this struct provide fields to encode time values in the order Nano seconds and seconds.

The member ns is also used as a correction factor for ARM_ETH_MAC_TIMER_ADJUST_CLOCK.

Used in:

- ARM_ETH_MAC_GetRxFrameTime
- ARM_ETH_MAC_GetTxFrameTime
- ARM_ETH_MAC_ControlTimer

Data Fields
uint32_t | ns | Nano seconds.
uint32_t | sec | Seconds.

## Typedef Documentation

ARM_ETH_MAC_SignalEvent_t

Pointer to ARM_ETH_MAC_SignalEvent : Signal Ethernet Event.

Provides the typedef for the callback function ARM_ETH_MAC_SignalEvent.

Parameter for:

- ARM_ETH_MAC_Initialize

## Function Documentation

int32_t ARM_ETH_MAC_Control | ( | uint32_t | control,
|  | uint32_t | arg
| ) |  |

Control Ethernet Interface.

Parameters

  [in] | control | Operation
  [in] | arg | Argument of operation (optional)

Returns
  Status Error Codes

Controls the Ethernet MAC interface settings and executes various operations.

The parameter control specifies various operations (see tables below). Depending on the control bits, the parameter arg provides additional information or sets values.

Example:

- see Ethernet Interface - Driver Functions

ARM_ETH_MAC_xxx controls configure the Ethernet MAC interface or execute various operations:

Controls | Description
--- | ---
ARM_ETH_MAC_CONFIGURE | Configure the Ethernet MAC interface; arg sets the configuration
ARM_ETH_MAC_CONTROL_TX | Enable or disable the transmitter; arg : 0=disabled; 1=enabled
ARM_ETH_MAC_CONTROL_RX | Enable or disable the receiver; arg : 0=disabled; 1=enabled
ARM_ETH_MAC_FLUSH | Flush a buffer; arg = takes values as described in Ethernet MAC Flush Flags
ARM_ETH_MAC_SLEEP | Enter/Exit Sleep mode; arg : 1=enter and wait for Magic packet; 0=exit
ARM_ETH_MAC_VLAN_FILTER | Configure VLAN Filter for received frames; arg15..0 : VLAN Tag; arg16 : optional ARM_ETH_MAC_VLAN_FILTER_ID_ONLY

Ethernet MAC Configuration specifies speed mode, link mode, checksum, and frame filtering modes:

Ethernet MAC Configuration | Description
--- | ---
ARM_ETH_MAC_SPEED_10M | Set the link speed to 10 [Mbps]
ARM_ETH_MAC_SPEED_100M | Set the link speed to 100 [Mbps]
ARM_ETH_MAC_SPEED_1G | Set the link speed to 1 [Gbps]
ARM_ETH_MAC_DUPLEX_HALF | Set the link mode to half duplex
ARM_ETH_MAC_DUPLEX_FULL | Set the link mode to full duplex
ARM_ETH_MAC_LOOPBACK | Set the interface into a Loop-back test mode
ARM_ETH_MAC_CHECKSUM_OFFLOAD_RX | Enable Receiver Checksum offload
ARM_ETH_MAC_CHECKSUM_OFFLOAD_TX | Enable Transmitter Checksum offload
ARM_ETH_MAC_ADDRESS_BROADCAST | Accept frames with Broadcast address
ARM_ETH_MAC_ADDRESS_MULTICAST | Accept frames with any Multicast address
ARM_ETH_MAC_ADDRESS_ALL | Accept frames with any address (Promiscuous Mode)

ARM_ETH_MAC_FLUSH_xx specifies which buffer to flush:

Ethernet MAC Flush Flags | Description
--- | ---
ARM_ETH_MAC_FLUSH_RX | Flush the Receive buffer
ARM_ETH_MAC_FLUSH_TX | Flush the Transmit buffer

int32_t ARM_ETH_MAC_ControlTimer | ( | uint32_t | control,
|  | ARM_ETH_MAC_TIME * | time
| ) |  |

Control Precision Timer.

Parameters

  [in] | control | Operation
  [in] | time | Pointer to time structure

Returns
  Status Error Codes

Controls the timer required for PTP (Precision Time Protocol).

The parameter control receives ARM_ETH_MAC_TIMER_xxx codes to manage the timer for a PTP enabled Ethernet MAC interface.

The parameter time is pointer to a struct that holds time information.

Mode Parameters: Timer Controls | Description
--- | ---
ARM_ETH_MAC_TIMER_GET_TIME | Retrieve the current time and update the content ARM_ETH_MAC_TIME *time.
ARM_ETH_MAC_TIMER_SET_TIME | Set the new time using the values provided with ARM_ETH_MAC_TIME *time.
ARM_ETH_MAC_TIMER_INC_TIME | Increment the current time by using the values provided with ARM_ETH_MAC_TIME *time.
ARM_ETH_MAC_TIMER_DEC_TIME | Decrement the current time by using the values provided with ARM_ETH_MAC_TIME *time.
ARM_ETH_MAC_TIMER_SET_ALARM | Set the alarm time to the values provided with ARM_ETH_MAC_TIME *time.
ARM_ETH_MAC_TIMER_ADJUST_CLOCK | Set the clock frequency; the value in time->ns is the correction factor in fractional format q31.

ARM_ETH_MAC_CAPABILITIES ARM_ETH_MAC_GetCapabilities | ( | void |  | ) |

Get driver capabilities.

Returns
  ARM_ETH_MAC_CAPABILITIES

The function ARM_ETH_MAC_GetCapabilities retrieves information about capabilities in this driver implementation. The bitfield members of the struct ARM_ETH_MAC_CAPABILITIES encode various capabilities, for example if a hardware is capable to create checksums in hardware or signal events using the ARM_ETH_MAC_SignalEvent callback function.

Example:

extern ARM_DRIVER_ETH_MAC Driver_ETH_MAC0;
ARM_DRIVER_ETH_MAC *mac;
void read_capabilities (void) {
ARM_ETH_MAC_CAPABILITIES mac_capabilities;
mac = &Driver_ETH_MAC0;
mac_capabilities = mac->GetCapabilities ();
// interrogate capabilities
}

int32_t ARM_ETH_MAC_GetMacAddress | ( | ARM_ETH_MAC_ADDR * | ptr_addr | ) |

Get Ethernet MAC Address.

Parameters

  [in] | ptr_addr | Pointer to address

Returns
  Status Error Codes

The function ARM_ETH_MAC_GetMacAddress retrieves the Ethernet MAC own address from the driver.

uint32_t ARM_ETH_MAC_GetRxFrameSize | ( | void |  | ) |

Get size of received Ethernet frame.

Returns
  number of bytes in received frame

Retrieve size of a received Ethernet frame. This function is called before ARM_ETH_MAC_ReadFrame and supplies the value len.

The frame size includes MAC destination and ends with the last Payload data byte.

Example:

- see ARM_ETH_MAC_ReadFrame

int32_t ARM_ETH_MAC_GetRxFrameTime | ( | ARM_ETH_MAC_TIME * | time | ) |

Get time of received Ethernet frame.

Parameters

  [in] | time | Pointer to time structure for data to read into

Returns
  Status Error Codes

Retrieve time stamp of a received Ethernet frame. This function must be called before the frame is read using ARM_ETH_MAC_ReadFrame.

int32_t ARM_ETH_MAC_GetTxFrameTime | ( | ARM_ETH_MAC_TIME * | time | ) |

Get time of transmitted Ethernet frame.

Parameters

  [in] | time | Pointer to time structure for data to read into

Returns
  Status Error Codes

Retrieve time stamp of a transmitted Ethernet frame.

ARM_DRIVER_VERSION ARM_ETH_MAC_GetVersion | ( | void |  | ) |

Get driver version.

Returns
  ARM_DRIVER_VERSION

The function ARM_ETH_MAC_GetVersion returns version information of the driver implementation in ARM_DRIVER_VERSION

- API version is the version of the CMSIS-Driver specification used to implement this driver.
- Driver version is source code version of the actual driver implementation.

Example:

extern ARM_DRIVER_ETH_MAC Driver_ETH_MAC0;
ARM_DRIVER_ETH_MAC *mac;
void setup_ethernet (void) {
ARM_DRIVER_VERSION version;
mac = &Driver_ETH_MAC0;
version = mac->GetVersion ();
if (version.api < 0x10A) { // requires at minimum API version 1.10 or higher
// error handling
return;
}
}

int32_t ARM_ETH_MAC_Initialize | ( | ARM_ETH_MAC_SignalEvent_t | cb_event | ) |

Initialize Ethernet MAC Device.

Parameters

  [in] | cb_event | Pointer to ARM_ETH_MAC_SignalEvent

Returns
  Status Error Codes

The function ARM_ETH_MAC_Initialize initializes the Ethernet MAC interface. It is called when the middleware component starts operation.

The ARM_ETH_MAC_Initialize function performs the following operations:

- Initializes the resources needed for the Ethernet MAC peripheral.
- Registers the ARM_ETH_MAC_SignalEvent callback function.

The parameter cb_event is a pointer to the ARM_ETH_MAC_SignalEvent callback function; use a NULL pointer when no callback signals are required.

Example:

- see Ethernet Interface - Driver Functions

int32_t ARM_ETH_MAC_PHY_Read | ( | uint8_t | phy_addr,
|  | uint8_t | reg_addr,
|  | uint16_t * | data
| ) |  |

Read Ethernet PHY Register through Management Interface.

Parameters

  [in] | phy_addr | 5-bit device address
  [in] | reg_addr | 5-bit register address
  [out] | data | Pointer where the result is written to

Returns
  Status Error Codes

Read Ethernet PHY Register through the Management Interface. The function is passed to ARM_ETH_PHY_Initialize. The Ethernet PHY driver uses this function to read the value of PHY registers.

Example:

- see Ethernet Interface - Driver Functions

int32_t ARM_ETH_MAC_PHY_Write | ( | uint8_t | phy_addr,
|  | uint8_t | reg_addr,
|  | uint16_t | data
| ) |  |

Write Ethernet PHY Register through Management Interface.

Parameters

  [in] | phy_addr | 5-bit device address
  [in] | reg_addr | 5-bit register address
  [in] | data | 16-bit data to write

Returns
  Status Error Codes

Write Ethernet PHY Register through the Management Interface. The function is passed to ARM_ETH_PHY_Initialize. The Ethernet PHY driver uses this function to write data to PHY registers.

Example:

- see Ethernet Interface - Driver Functions

int32_t ARM_ETH_MAC_PowerControl | ( | ARM_POWER_STATE | state | ) |

Control Ethernet MAC Device Power.

Parameters

  [in] | state | Power state

Returns
  Status Error Codes

The function ARM_ETH_MAC_PowerControl allows you to configure the power modes of the Ethernet MAC interface.

The argument state can be:

- ARM_POWER_OFF: Ethernet MAC peripheral is turned off.
- ARM_POWER_FULL: Ethernet MAC peripheral is turned on and fully operational.

If power state specifies an unsupported mode, the function returns ARM_DRIVER_ERROR_UNSUPPORTED as status information and the previous power state of the peripheral is unchanged. Multiple calls with the same state generate no error.

Example:

- see Ethernet Interface - Driver Functions

int32_t ARM_ETH_MAC_ReadFrame | ( | uint8_t * | frame,
|  | uint32_t | len
| ) |  |

Read data of received Ethernet frame.

Parameters

  [in] | frame | Pointer to frame buffer for data to read into
  [in] | len | Frame buffer length in bytes

Returns
  number of data bytes read or execution status
  - value >= 0: number of data bytes read
  - value < 0: error occurred, value is execution status as defined with Status Error Codes

The function ARM_ETH_MAC_ReadFrame reads an Ethernet frame from the Ethernet MAC receive buffer.

The Ethernet MAC receive engine must be enabled using the function ARM_ETH_MAC_Control (ARM_ETH_MAC_CONTROL_RX , 1) before a call to this function. The len of the Ethernet frame can be checked using the function ARM_ETH_MAC_GetRxFrameSize.

The frame data addressed by buf starts with MAC destination and ends with the last Payload data byte. The frame data is read from the receive buffer of the Ethernet MAC interface and the number of bytes written into the memory addressed by buf is returned. A negative return value indicates an error whereby the status code is defined with driver common return codes.

The function ARM_ETH_MAC_ReadFrame may be called with buf = NULL and len = 0 to discard or release an frame. This is useful when an incorrect frame has been received or no memory is available to hold the Ethernet frame.

Example:

size = mac->GetRxFrameSize ();
if ((size < 14) || (size > 1514)) { // frame excludes CRC
mac->ReadFrame (NULL, 0); // Frame error, release it
}
len = mac->ReadFrame (&frame->data[0], size);
if (len < 0) {
// error handling
}

int32_t ARM_ETH_MAC_SendFrame | ( | const uint8_t * | frame,
|  | uint32_t | len,
|  | uint32_t | flags
| ) |  |

Send Ethernet frame.

Parameters

  [in] | frame | Pointer to frame buffer with data to send
  [in] | len | Frame buffer length in bytes
  [in] | flags | Frame transmit flags (see ARM_ETH_MAC_TX_FRAME_...)

Returns
  Status Error Codes

The function ARM_ETH_MAC_SendFrame writes an Ethernet frame to the Ethernet MAC transmit buffer.

The Ethernet MAC transmit engine must be enabled by using the function ARM_ETH_MAC_Control (ARM_ETH_MAC_CONTROL_TX, 1) before a call to this function.

The frame data addressed by buf starts with MAC destination and ends with the last Payload data byte. The frame data is copied into the transmit buffer of the Ethernet MAC interface. The function does not wait until the transmission over the Ethernet is complete, however the memory addressed by buf is available for the next Ethernet frame after return.

The maximum value for len is implied by the size restrictions of the Ethernet frame but is not verified. Using an invalid value for len may generate unpredicted results.

The parameter flags specifies additional attributes for the function as shown in the following table. Multiple flags can be combined, for example: ARM_ETH_MAC_TX_FRAME_EVENT | ARM_ETH_MAC_TX_FRAME_TIMESTAMP.

Flag bit | Description
--- | ---
ARM_ETH_MAC_TX_FRAME_FRAGMENT | Indicates that it is a fragment of the frame. allows you to collect multiple fragments before the frame is sent.
ARM_ETH_MAC_TX_FRAME_EVENT | ARM_ETH_MAC_SignalEvent with event bit ARM_ETH_MAC_EVENT_TX_FRAME set will be called when frame send is complete.
ARM_ETH_MAC_TX_FRAME_TIMESTAMP | Capture the time stamp of the frame. The time stamp can be obtained using the function ARM_ETH_MAC_GetTxFrameTime.

Example:

status = mac->SendFrame (&frame->data[0], frame->length, 0);
if (status != ARM_DRIVER_OK) {
// error handling
}

int32_t ARM_ETH_MAC_SetAddressFilter | ( | const ARM_ETH_MAC_ADDR * | ptr_addr,
|  | uint32_t | num_addr
| ) |  |

Configure Address Filter.

Parameters

  [in] | ptr_addr | Pointer to addresses
  [in] | num_addr | Number of addresses to configure

Returns
  Status Error Codes

The function ARM_ETH_MAC_SetAddressFilter configures Ethernet MAC receiver address filtering. The Ethernet MAC accepts packets Ethernet frames which contains a MAC destination address of the list supplied with ptr_addr. The parameter ptr_addr provides and array of Ethernet MAC addresses. The number of addresses is supplied by num_addr.

The Ethernet MAC receiver will accept packets addressed to its own address and packets with addresses configured by this function.

MAC receiver can be configured to accept also packets with broadcast address, any multicast address or even all packets regardless of address (Promiscuity Mode). This is configured by function ARM_ETH_MAC_Control with ARM_ETH_MAC_CONFIGURE as control parameter.

int32_t ARM_ETH_MAC_SetMacAddress | ( | const ARM_ETH_MAC_ADDR * | ptr_addr | ) |

Set Ethernet MAC Address.

Parameters

  [in] | ptr_addr | Pointer to address

Returns
  Status Error Codes

The function ARM_ETH_MAC_SetMacAddress configures Ethernet MAC own address. The Ethernet MAC accepts packets Ethernet frames which contains a MAC destination address that matches the address specified with ptr_addr.

The Ethernet MAC receiver will accept also packets with addresses configured by ARM_ETH_MAC_SetAddressFilter function.

MAC receiver can be configured to accept also packets with broadcast address, any multicast address or even all packets regardless of address (Promiscuity Mode). This is configured by function ARM_ETH_MAC_Control with ARM_ETH_MAC_CONFIGURE as control parameter.

void ARM_ETH_MAC_SignalEvent | ( | uint32_t | event | ) |

Callback function that signals a Ethernet Event.

Parameters

  [in] | event | event notification mask

Returns
  none

The function ARM_ETH_MAC_SignalEvent notifies the various Ethernet MAC Events and it is registered by the function ARM_ETH_MAC_Initialize. The function ARM_ETH_MAC_GetCapabilities returns information about the implemented optional events in a driver. This function is typically called from interrupt service routines (ISR) to indicate that a frame is processed or a special event occurred.

The argument event represents the notification mask of the events. One or more events may be notified with the same callback.

Each event is coded in a bit and therefore it is possible to signal multiple events in the event call back function. The following call back notifications are generated:

Bit | Event | Description
--- | --- | ---
0 | ARM_ETH_MAC_EVENT_RX_FRAME | Occurs after a frame is received. Frame can be read by calling ARM_ETH_MAC_ReadFrame.
1 | ARM_ETH_MAC_EVENT_TX_FRAME | Occurs after call to ARM_ETH_MAC_SendFrame to indicate that the frame is transmitted.
2 | ARM_ETH_MAC_EVENT_WAKEUP | Indicates that a Magic Packet is received while the driver is set to ARM_POWER_LOW mode using ARM_ETH_MAC_PowerControl.
3 | ARM_ETH_MAC_EVENT_TIMER_ALARM | Indicates that a Timer Alarm occurred that was set with ARM_ETH_MAC_TIMER_SET_ALARM using ARM_ETH_MAC_ControlTimer.

int32_t ARM_ETH_MAC_Uninitialize | ( | void |  | ) |

De-initialize Ethernet MAC Device.

Returns
  Status Error Codes

The function ARM_ETH_MAC_Uninitialize de-initializes the resources of Ethernet MAC interface.

It is called when the middleware component stops operation and releases the software resources used by the interface.