266 lines
10 KiB
C
266 lines
10 KiB
C
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#ifndef __RTL8019_H__
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#define __RTL8019_H__
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/*****************************************************************************
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* Module Name: Realtek 8019AS Driver
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*
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* Created By: Louis Beaudoin (www.embedded-creations.com)
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*
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* Original Release: September 21, 2002
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*
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* Module Description:
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* Provides functions to initialize the Realtek 8019AS, and send and retreive
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* packets
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*
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* September 30, 2002 - Louis Beaudoin
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* Receive functions modified to handle errors encountered when receiving a
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* fast data stream. Functions now manually retreive data instead of
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* using the send packet command. Interface improved by checking for
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* overruns and data in the buffer internally.
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* Corrected the overrun function - overrun flag was not reset after overrun
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* Added support for the Imagecraft Compiler
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* Added support to communicate with the NIC using general I/O ports
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*
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*****************************************************************************/
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/*#include "delay.h"*/
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#include "compiler.h"
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/*****************************************************************************
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* RTL8019beginPacketSend(unsigned int packetLength)
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* Args: unsigned int - length of the Ethernet frame (see note)
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* Created By: Louis Beaudoin
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* Date: September 21, 2002
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* Description: Sets up the NIC to send a packet
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* Notes: The NIC will not send packets less than 60 bytes long (the min
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* Ethernet frame length. The transmit length is automatically
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* increased to 60 bytes if packetLength is < 60
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*****************************************************************************/
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void RTL8019beginPacketSend(unsigned int packetLength);
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/*****************************************************************************
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* RTL8019sendPacketData(unsigned char * localBuffer, unsigned int length)
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* Args: 1. unsigned char * localBuffer - Pointer to the beginning of
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* the buffer to load into the NIC
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* 2. unsigned char length - number of bytes to copy to
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* the NIC
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* Created By: Louis Beaudoin
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* Date: September 21, 2002
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* Description: Loads length # of bytes from a local buffer to the transmit
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* packet buffer
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* Notes: RTL8019beginPacketSend() must be called before sending
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* any data.
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* Several calls to RTL8019retreivePacketData() may be made to
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* copy packet data from different buffers
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*****************************************************************************/
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void RTL8019sendPacketData(unsigned char * localBuffer, unsigned int length);
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/*****************************************************************************
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* RTL8019endPacketSend()
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* Created By: Louis Beaudoin
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* Date: September 21, 2002
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* Description: Ends a packet send operation and instructs the NIC to transmit
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* the frame over the network
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*****************************************************************************/
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void RTL8019endPacketSend(void);
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/*****************************************************************************
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* initRTL8019(void);
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*
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* Created By: Louis Beaudoin
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* Date: September 21, 2002
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* Description: Sets up the RTL8019 NIC hardware interface, and initializes
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* the buffers and configuration of the NIC
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*****************************************************************************/
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void initRTL8019(void);
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/*****************************************************************************
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* processRTL8019Interrupt(void);
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*
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* Created By: Louis Beaudoin
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* Date: September 21, 2002
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* Description: Reads the NIC's ISR register looking for a receive buffer
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* overrun - which is then handled.
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* Notes: The function does not need to be called in response to an
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* interrupt. The function can be polled and the NIC's INT
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* line not used. This function should be called before
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* attempting to retreive a packet from the NIC
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*****************************************************************************/
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void processRTL8019Interrupt(void);
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/*****************************************************************************
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* unsigned char RTL8019ReceiveEmpty(void);
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*
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* Returns: non-zero (true) if buffer is empty, zero if data in buffer
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* Created By: Louis Beaudoin
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* Date: September 21, 2002
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* Description: Compares the BNRY and CURR receive buffer pointers to see if
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* there is a packet in the receive buffer
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* ** Removed as of version 0.60.1 **
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*****************************************************************************/
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//unsigned char RTL8019ReceiveEmpty(void);
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/*****************************************************************************
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* unsigned int RTL8019beginPacketRetreive()
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* Returns: unsigned int - length of the Ethernet frame (see note)
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* Created By: Louis Beaudoin
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* Date: September 21, 2002
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* Description: Sets up the NIC to retreive a packet
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* Notes: The size returned is the size of all the data in the Ethernet
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* frame minus the Ethernet checksum. This may include unused
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* trailer bytes appended if data is less than the minimum
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* Ethernet frame length (60 bytes). A size of zero indicates
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* there are no packets available.
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* A call to RTL8019beginPacketRetreive() must be followed by a
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* call to RTL8019endPacketRetreive() regardless if data is
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* retreived, unless 0 is returned.
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*****************************************************************************/
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unsigned int RTL8019beginPacketRetreive(void);
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/*****************************************************************************
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* RTL8019retreivePacketData(unsigned char * localBuffer, unsigned int length)
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* Args: 1. unsigned char * localBuffer - Pointer to the beginning of
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* the buffer to store the ethernet frame.
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* 2. unsigned char length - number of bytes to copy to
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* localBuffer
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* Created By: Louis Beaudoin
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* Date: September 21, 2002
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* Description: Loads length # of bytes from the receive packet buffer to
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* a local buffer
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* Notes: RTL8019beginPacketRetreive() must be called before retreiving
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* any data.
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* Several calls to RTL8019retreivePacketData() may be made to
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* copy packet data to different buffers
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*****************************************************************************/
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void RTL8019retreivePacketData(unsigned char * localBuffer,
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unsigned int length);
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/*****************************************************************************
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* RTL8019endPacketRetreive()
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* Created By: Louis Beaudoin
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* Date: September 21, 2002
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* Description: Ends a packet retreive operation begun by calling
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* RTL8019beginPacketRetreive(). The NIC buffer space used by
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* the retreived packet is freed
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* Notes: A packet may be removed from the buffer without being read
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* by calling RTL8019endPacketRetreive() after
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* RTL8019beginPacketRetreive().
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*****************************************************************************/
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void RTL8019endPacketRetreive(void);
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/*****************************************************************************
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*
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* AVR hardware setup
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*
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* External SRAM Interface:
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* The five NIC address lines are taken from A8-A12 (uses the
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* non-multiplexed address port so no latch is required)
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*
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* General I/O Interface:
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* Two full ports are required for the address and data buses. Two pins
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* from another port are used to control the read and write lines
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*
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* One output pin is required for hard resetting the NIC
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*
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*****************************************************************************/
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// set to 1 to use the External SRAM Interface - 0 for General I/O
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#define MEMORY_MAPPED_NIC 1
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#if MEMORY_MAPPED_NIC /*** NIC Interface through External SRAM Interface ****/
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// NIC is mapped from address 0x8000 - 0x9F00
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#define MEMORY_MAPPED_RTL8019_OFFSET 0x8300
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#else /************ NIC Interface through General I/O *******************/
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// RTL8019 address port
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#define RTL8019_ADDRESS_PORT PORTC
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#define RTL8019_ADDRESS_DDR DDRC
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// RTL8019 data port
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#define RTL8019_DATA_PORT PORTA
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#define RTL8019_DATA_DDR DDRA
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#define RTL8019_DATA_PIN PINA
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// RTL8019 control port
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#define RTL8019_CONTROL_PORT PORTD
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#define RTL8019_CONTROL_DDR DDRD
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#define RTL8019_CONTROL_READPIN PD7
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#define RTL8019_CONTROL_WRITEPIN PD6
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// macros to control the read and write pins
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#define RTL8019_CLEAR_READ cbi(RTL8019_CONTROL_PORT,\
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RTL8019_CONTROL_READPIN)
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#define RTL8019_SET_READ sbi(RTL8019_CONTROL_PORT,\
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RTL8019_CONTROL_READPIN)
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#define RTL8019_CLEAR_WRITE cbi(RTL8019_CONTROL_PORT,\
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RTL8019_CONTROL_WRITEPIN)
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#define RTL8019_SET_WRITE sbi(RTL8019_CONTROL_PORT,\
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RTL8019_CONTROL_WRITEPIN)
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#endif /** NIC Interface **/
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// RTL RESET - Port B pin 0
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#define RTL8019_RESET_PORT PORTE
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#define RTL8019_RESET_DDR DDRE
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#define RTL8019_RESET_PIN PORTE0
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/*****************************************************************************
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*
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* Ethernet constants
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*
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*****************************************************************************/
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#define ETHERNET_MIN_PACKET_LENGTH 0x3C
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#define ETHERNET_HEADER_LENGTH 0x0E
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/*****************************************************************************
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*
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* MAC address assigned to the RTL8019
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*
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*****************************************************************************/
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/*#define MYMAC_0 '0'
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#define MYMAC_1 'F'
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#define MYMAC_2 'F'
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#define MYMAC_3 'I'
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#define MYMAC_4 'C'
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#define MYMAC_5 'E'*/
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#define MYMAC_0 0x00
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#define MYMAC_1 0x06
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#define MYMAC_2 0x98
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#define MYMAC_3 0x01
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#define MYMAC_4 0x02
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#define MYMAC_5 0x26
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#endif /* __RTL8019_H__ */
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