isa_bus.h File Reference

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Detailed Description

AVR Low Level Function - ISA Bus.

Author:

Ricardo Castro (sirpdc@gmail.com)

Definition in file isa_bus.h.

#include <avr/io.h>
#include "util.h"
#include "debug.h"

Go to the source code of this file.

Address Bus Configuration
#define	ADDR_PORT   PORTA
	data port used for address bus
#define	ADDR_DDR   DDRA
	data direction for address bus
#define	ADDR_PINS   0b00011111
	port pins used by address bus( 1 indicate that the pin is used)
Data Bus Configuration
#define	DATA_PORT_L   PORTC
	port used for data bus
#define	DATA_DDR_L   DDRC
	data direction for data bus
#define	DATA_READ_L   PINC
	port used to read data
#define	DATA_PINS_L   0b11111111
	port pins used by data bus (1 indicate that the pin is used)
Control Bus Configuration
#define	CNTRL_PORT   PORTA
	port used for control bus
#define	CNTRL_DDR   DDRA
	data direction for control bus
#define	CNTRL_PINS   0b11100000
	port pins used by control bus (1 indicate that the pin is used)
#define	RESET_PIN   0b10000000
	port pin used by reset line (1 indicate that the pin is used)
#define	READ_PIN   0b00100000
	port pin used by read line (1 indicate that the pin is used)
#define	WRITE_PIN   0b01000000
	port pin used by write line (1 indicate that the pin is used)
Defines
#define	SetBits(_port_sss, _mask_sss)   _port_sss |= (_mask_sss)
	Set bit's positions that have 1 on mask.
#define	RstBits(_port_sss, _mask_sss)   _port_sss &= (~ (_mask_sss) )
	Reset bit's positions that have 0 on mask.
#define	WritePort(_port_sss, _mask_sss, _value_sss)
	Write a new value to port using mask: 1) put 0 on all the mask bits that are 0 2) put 1 on all the mask bits that are 1.
#define	nop()   asm volatile("nop\n\t"::)
	Insert a nop.
#define	WaitState()
	Insert a delay ~= 125ns.
Functions
void	rtl8019write (unsigned char data, unsigned char address)
	Writes byte to RTL8019 register.
unsigned char	rtl8019read (unsigned char address)
	Reads byte from RTL8019 register.
void	rtl8019SetupPorts (void)
	Sets up the ports used for communication with the RTL8019 NIC (data bus, address bus, read, write, and reset).

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