www.pudn.com > ADSP-BF561_MicronSensorExample_I2C_ASM_in_C.zip > I2C.h

/******************************************************************************/ 
// 
// Name: SCCB Software Interface for Video Device configurations - C Callable 
// 
/***************************************************************************************************************** 
 
(C) Copyright 2003 - Analog Devices, Inc.  All rights reserved. 
 
File Name:	I2C_BF561_rev03.asm	 
 
Date Modified:	22 December 04		TL		Rev 2.0 
 
Software:       VisualDSP++3.5 (November Update) 
 
Hardware:		BF561 EZ-KIT Board 
 
Special Connections:  None 
 
Purpose:		To configure video devices  
				 
				 
Program Parameters: 
 
************************************************************************************************/ 
 
/*************** SCCB Start Settings**************************************/ 
/*Before Calling the SCCB_Interface the inputs to the SCCB_Taskmanager	 */ 
/*must be done. 														 */ 
/* Write to the "SCCB_Control" a "1" for reading from the Device or 	 */ 
/* a "2" for writing to the Device.										 */ 
/*																		 */ 
/* Leave the total number of bytes in "SCCB_Wordcount".Device Addresses  */ 
/* and Word Addresses included.											 */ 
/*																		 */ 
/* Write all data to the "SCCB_DataIn". 								 */ 
/* e.g.Writing to the device:											 */ 
/*																		 */ 
/*			SCCB_DataIn 			Device Address	(LSB must be Zero)	 */ 
/*									Word Address						 */ 
/*									Data 1								 */ 
/*									Data 2								 */ 
/*									  .									 */ 
/*************************************************************************/ 
/* (e.g.Reading from the device:										 */ 
/*			SCCB_DataIn 			Device Address	(LSB must be zero)   */ 
/*									Word Address						 */ 
/*									Device Address	(LSB must be one)	 */ 
/*																		 */ 
/*																		 */ 
/*	The data elements received can be found in the array 				 */ 
/*									_SCCB_DataOut[10]					 */ 
/*																		 */ 
/*																		 */ 
/*																		 */ 
/*																		 */ 
/*************************************************************************/ 
 
#ifndef _I2C_INCLUDE 
#define _I2C_INCLUDE 
 
/* To use the I2C routine, simply call the I2C_wr and I2C_rd	*/ 
/* to write to or read from the slave device, e.g. the video	*/ 
/* encoder or decoder. Slave address is the hardware address	*/ 
/* of the slave device, on receiving the slave address, the 	*/ 
/* corresponding slave device will acknowledge by pulling		*/ 
/* the Sdata line(PF0 here) low. The reg_subaddress is the		*/ 
/* subaddress of the slave device you want to write to or read	*/ 
/* from. The value is just the value you want to configure.		*/ 
/* To read from the device, you need to send out the slave 		*/ 
/* WRITE address first (NOT READ ADDRESS !!!), followed by the	*/ 
/* subaddress from which you want to read the value and THEN 	*/ 
/* the slave READ address. You can find examples in the main.c	*/ 
/* The above description is based on the use of the ADV7185 and	*/ 
/* ADV7304A, so if other devices are used, the configuration may*/ 
/* differ.														*/ 
 
#define I2C_wr(slave_addr, reg_subaddr, hivalue,lowvalue)\ 
		asm(".extern SCCB_DataIn;");\ 
		asm(".extern SCCB_Word_Count;");\ 
		asm(".extern SCCB_Control;");\ 
		asm(".extern _SCCB_In_Progress;");\ 
		asm(".extern SCCB_Interface;");\ 
		asm("p0.l = SCCB_DataIn;");\ 
		asm("p0.h = SCCB_DataIn;");\ 
		asm("r0=%0;" :: "d"(slave_addr));\ 
		asm("[p0++]=r0;");\ 
		asm("r0=%0;" :: "d"(reg_subaddr));\ 
		asm("[p0++]=r0;");\ 
		asm("r0=%0;" :: "d"(hivalue));\ 
		asm("[p0++]=r0;");\ 
		asm("r0=%0;" :: "d"(lowvalue));\ 
		asm("[p0++]=r0;");\ 
		asm("p0.l = SCCB_Word_Count;");\ 
		asm("p0.l = SCCB_Word_Count;");\ 
		asm("r0=4(z);");\ 
		asm("[p0]=r0;");\ 
		asm("p0.l = SCCB_Control;");\ 
		asm("p0.h = SCCB_Control;");\ 
		asm("r0 = 2 (z);");\ 
		asm("[p0] = r0;");\ 
		asm("p0.h = _SCCB_In_Progress;");\ 
		asm("p0.l = _SCCB_In_Progress;");\ 
		asm("r0 = 1;");\ 
		asm("[p0] = r0;");\ 
		asm("CALL SCCB_Interface;") 
 
#define I2C_rd(slave_addr_wr, reg_subaddr, slave_addr_rd)\ 
		asm(".extern SCCB_DataIn;");\ 
		asm(".extern SCCB_Word_Count;");\ 
		asm(".extern SCCB_Control;");\ 
		asm(".extern _SCCB_In_Progress;");\ 
		asm(".extern SCCB_Interface;");\ 
		asm("p0.l = SCCB_DataIn;");\ 
		asm("p0.h = SCCB_DataIn;");\ 
		asm("r0=%0;" :: "d"(slave_addr_wr));\ 
		asm("[p0++]=r0;");\ 
		asm("r0=%0;" :: "d"(reg_subaddr));\ 
		asm("[p0++]=r0;");\ 
		asm("r0=%0;" :: "d"(slave_addr_rd));\ 
		asm("[p0++]=r0;");\ 
		asm("p0.l = SCCB_Word_Count;");\ 
		asm("p0.l = SCCB_Word_Count;");\ 
		asm("r0=5(z);");\ 
		asm("[p0] = r0;");\ 
		asm("p0.l = SCCB_Control;");\ 
		asm("p0.h = SCCB_Control;");\ 
		asm("r0 = 1 (z);");\ 
		asm("[p0] = r0;");\ 
		asm("p0.h = _SCCB_In_Progress;");\ 
		asm("p0.l = _SCCB_In_Progress;");\ 
		asm("r0 = 1;");\ 
		asm("[p0] = r0;");\ 
		asm("CALL SCCB_Interface;") 
 
#endif