cm2_funcs.c

来自「PEAKAUDIO用于EV2板的MCU控制源码」· C语言 代码 · 共 99 行

/*************************************************************************

	cm2_funcs.c

	This file specifies the routines to interface to the Host port on the
	CM-2 CobraNet Module.

	Copyright (C) 2001-2004 by Cirrus Logic Inc. All Rights Reserved
*************************************************************************/

#include <stdlib.h>
#include <stdio.h>
#include <intrpt.h>
#include <8051.h>
#include <string.h>
#include "command.h"
#include "test.h"
#include "serial.h"
#include "error.h"
#include "hostport.h"
#include "cm2_funcs.h"

extern near long gPeekPointer;
extern near long gPokePointer;
extern near long gLast_hackTranslation;

/************************************************************************/
/*                         Code starts here                             */
/************************************************************************/
//read and write the host registers.
//see CS18101 manual for more information about these registers.

void write_message_reg( unsigned char which_reg, unsigned char the_message )	{
	char * iHost_ptr = ( char * ) ( cHOST_MESSAGE_ptr + which_reg );

	*( iHost_ptr ) = the_message;
}

unsigned char read_data_reg( unsigned char which_reg )	{
	char * iHost_ptr = ( char * ) ( cHOST_DATA_ptr + which_reg );

	return( *( iHost_ptr ) );
}

void write_data_reg( unsigned char which_reg, unsigned char the_data )	{
	char * iHost_ptr = ( char * ) ( cHOST_DATA_ptr + which_reg );

	*( iHost_ptr ) = the_data;
}

//If the module discovered is a CM-2 then the following routines are used.
//see Hostport.c for assignment routines. Similar ones exist for the CM-1.
extern unsigned char Host_Translate_Address_CM2( unsigned long address ) {
	write_message_reg( cHOST_REG_C, address );
	write_message_reg( cHOST_REG_B, address >>= 8 );
	write_message_reg( cHOST_REG_A, address >>= 8 );
	write_message_reg( cHOST_REG_D, cMSG_TRANSLATE_ADDRESS );

	return( cERR_NO_ERROR );
}

extern void Host_Interrupt_Ack_CM2 ( void )	{
	write_message_reg( cHOST_REG_D, cMSG_INTERRUPT_ACK );
}

unsigned char Host_Multiplex_OP_CM2 ( unsigned char mux_op )	{
	write_message_reg( cHOST_REG_C, mux_op );
	write_message_reg( cHOST_REG_D, cMSG_MULTIPLEX_OP );
	return( cERR_NO_ERROR );
}

extern unsigned char write_host_long_CM2( unsigned long the_data )	{
	unsigned char temp_char = the_data;

	write_data_reg( cHOST_REG_C, the_data >>= 8 );
	write_data_reg( cHOST_REG_B, the_data >>= 8 );
	write_data_reg( cHOST_REG_A, the_data >>= 8 );
	write_data_reg( cHOST_REG_D, temp_char );

	return( cERR_NO_ERROR );
}

extern unsigned long read_host_long_CM2( unsigned char * error_code_ptr )	{
	unsigned long temp_long = 0;

	*error_code_ptr = cERR_NO_ERROR;

	temp_long = read_data_reg( cHOST_REG_A );
	temp_long = ( temp_long << 8 ) | read_data_reg( cHOST_REG_B );
	temp_long = ( temp_long << 8 ) | read_data_reg( cHOST_REG_C );
	temp_long = ( temp_long << 8 ) | read_data_reg( cHOST_REG_D );

	return( temp_long );
}

void Host_Garbage_Read_CM2()	{
	read_data_reg( cHOST_REG_D );
}