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Hey guys, can any1 help me with the I2C send and receive code for the PIC32. Im a newbie with that any help is appreciated!
I2C code help
- Thread starter RoboticFan87
- Start date
The code I sent is code for reading and writing to an I2C device, you just have to call the main I2C_Init(void) function to initialize the Pic for I2C comms, (don't forget to set which I2C you are using on the pic I2C1 or I2C2 in the OpenI2Cn line, right now it is coded for I2C1) and the I2C_Read_Register and I2C_Write_Register takes care of all the start and stop sequences required to communicate with the device......
I will post the code here and see if anyone thinks or knows different, but this is the code I used in my B.U.M. System to communicate with an I2C Touch Pad controller (MPR084Q)....
Here is the C code.... You might want to change this line to match where you are placing these files....
and here is the header file ...
What problems are you having?? Did you download the Microchip directory file I mentioned in the PM reply?? That should fix your "missing files" problem with the USB/HID stack.....
Anyways if someone else has a better way.....
My .02
I will post the code here and see if anyone thinks or knows different, but this is the code I used in my B.U.M. System to communicate with an I2C Touch Pad controller (MPR084Q)....
Here is the C code.... You might want to change this line to match where you are placing these files....
Rich (BB code):
#include "C:\MDD File System\Microchip\Include\I2C.h"
Rich (BB code):
/*
** I2C.c
** Brent Morse
** 08/08/2008
*/
//##############################################################################
#include <p32xxxx.h> // Processor defs
#include <plib.h> // Peripheral Library's
#include "C:\MDD File System\Microchip\Include\I2C.h" //
//##############################################################################
#define SYSCLK (72000000)
#define PBCLK (SYSCLK/2)
#define Fsck 50000
#define BRG_VAL ((PBCLK/2/Fsck)-2)
//*****************************************************************************************************************************
#define Nop() asm( "nop" )
unsigned char SlaveAddress;
char i2cDat[10];
int DatSz;
char i2cbyte;
//*****************************************************************************************************************************
void I2C_Init(void)
{
OpenI2C1( I2C_EN | I2C_7BIT_ADD, BRG_VAL );
}
//*****************************************************************************************************************************
void I2C_Write_register(int mAddress,int mRegister,int mData)
{
i2cDat[0] = (mAddress << 1) | 0; //Device Address and WR Command
i2cDat[1] = mRegister; //Register Address
i2cDat[2] = mData; //Config Data
DatSz = 3;
StartI2C1(); //Send the Start Bit
IdleI2C1(); //Wait to complete
//
int Index = 0;
while( DatSz )
{
MasterWriteI2C1( i2cDat[Index++] );
IdleI2C1(); //Wait to complete
DatSz--;
//ACKSTAT is 0 when slave acknowledge. if 1 then slave has not acknowledge the data.
if( I2C1STATbits.ACKSTAT )
break;
}
//now send a start sequence again
RestartI2C1(); //Send the Restart condition
//wait for this bit to go back to zero
IdleI2C1(); //Wait to complete
Index = 0;
DatSz = 3;
while( DatSz ) //resend data.....
{
MasterWriteI2C1( i2cDat[Index++] );
IdleI2C1(); //Wait to complete
DatSz--;
//ACKSTAT is 0 when slave acknowledge. if 1 then slave has not acknowledge the data.
if( I2C1STATbits.ACKSTAT )
break;
}
StopI2C1(); //Send the Stop condition
IdleI2C1(); //Wait to complete
}
//*****************************************************************************************************************************
int I2C_Read_Register(int mI2CslaveAddress, int mRegisterAddress)
{
// Now Readback the data from the I2C Device
i2cDat[0] = (mI2CslaveAddress << 1) | 0; //Device Address and WR Command
i2cDat[1] = mRegisterAddress; //Register
DatSz = 2;
StartI2C1(); //Send the Start Bit
IdleI2C1(); //Wait to complete
//
int Index = 0;
while( DatSz )
{
MasterWriteI2C1( i2cDat[Index++] );
IdleI2C1(); //Wait to complete
DatSz--;
//ACKSTAT is 0 when slave acknowledge. if 1 then slave has not acknowledge the data.
if( I2C1STATbits.ACKSTAT )
break;
}
//now send a start sequence again
RestartI2C1(); //Send the Restart condition
//wait for this bit to go back to zero
IdleI2C1(); //Wait to complete
MasterWriteI2C1( (mI2CslaveAddress << 1) | 1 ); //transmit read command
IdleI2C1(); //Wait to complete
i2cbyte = MasterReadI2C1();
return (i2cbyte);
StopI2C1(); //Send the Stop condition
IdleI2C1(); //Wait to complete
}
//*****************************************************************************************************************************
int I2C_Wait(unsigned int cnt)
{
while(--cnt)
{
Nop();
Nop();
}
}//I2C Wait
//*****************************************************************************************************************************
Rich (BB code):
/***********************************************************************************
I2C.h - I2C routines header file
***********************************************************************************
By Brent Morse
***********************************************************************************
* THIS SOFTWARE IS PROVIDED IN AN AS IS CONDITION. NO WARRANTIES,
* WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED
* TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. BRENT MORSE SHALL NOT,
* IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
* CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
***********************************************************************************
*
***********************************************************************************
***********************************************************************************/
#ifndef _I2C_HEADER_FILE
#define _I2C_HEADER_FILE
//*******************************************************************************
/**
* \brief This function writes a register on the I2C Device
* \author Brent Morse
* \param RegisterAddress Address of the register to write
* \param Data Byte to write on the register
* \return void
*/
void I2C_Write_register(int mAddress,int mRegister,int mData);
//------------------------------------------------------------------------------------------------------
/**
* \brief This function reads a register of the I2C Device
* \author Brent Morse
* \param RegisterAddress Address to read.
* \return Read value
*/
int I2C_Read_Register(int mI2CslaveAddress, int mRegisterAddress);
//------------------------------------------------------------------------------------------------------
/**
* \brief This function enables the I2C peripheral
* \author Brent Morse
* \param RegisterAddress Address to read.
* \return Read value
*/
void I2C_Init(void);
//------------------------------------------------------------------------------------------------------
#endif //__I2CAnyways if someone else has a better way.....
My .02
i called I2C_Init() in the main right above the UserInit(). So now the I2C comm. are initialized for the PIC.
Where do i call the read and write functions of the I2C?
Do i call them in the parse_SI_packet(void) and parse_RI_packet(void)?
and in the parse_CI_packet(void) do i call I2C_init() again? or leave it blank?
Thanks
Where do i call the read and write functions of the I2C?
Do i call them in the parse_SI_packet(void) and parse_RI_packet(void)?
and in the parse_CI_packet(void) do i call I2C_init() again? or leave it blank?
Thanks
