I2C programming

[Wantas]

Hi everyone Can you help me ?? This code below is for CAN interface and tranceiver.. I'm green in this thing.. so I want to ask you how to write a code for I2C interface and Digital to analog converter..

#include "inc/hw_memmap.h"
#include "inc/hw_ty pes.h"
#include "inc/hw_ints.h"
#include "inc/hw_can.h"
#include "driverlib/can.h"
#include "driverlib/interrupt.h"
#include "driverlib/sysctl.h"
#include "driverlib/gpio.h"
#include "utils/uartstdio.h"



int main(void)
{
tCANMsgObject zinute;
int i = 0;
unsigned char duomenys[30];


zinute.ulMsgID = 1;  // CAN zinutes ID
zinute.ulMsgIDMask = 0;  // kauke naudojama kai yra ID filtravimas
zinute.ulFlags = 0;     // veliavele


//nustatomas taktavimas is isorinio taktiniu impulsu generatoriaus
SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
  SYSCTL_XTAL_16MHZ);


//ijungiamas bendros paskiries D portas kuriame yra reikalingi pinai

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);


//nustatoma alternatyvi funkcija GPIO pinams.
GPIOPinTypeCAN(GPIO_PORTD_BASE, GPIO_PIN_0 | GPIO_PIN_1);

 

// pinams priskiriamos CAN0 funkcijos 
GPIOPinConfigure(GPIO_PD0_CAN0RX);
GPIOPinConfigure(GPIO_PD1_CAN0TX);

 

// ijungiama CAN periferija
SysCtlPeripheralEnable(SYSCTL_PERIPH_CAN0);

 

// nustatomas CAN taktavimas
CANBitRateSet(CAN0_BASE, SysCtlClockGet(), 16000000);

 

//ijungiamas CAN
CANEnable(CAN0_BASE);

 

//kas 5s zinutei priskiriami duomenys ir ji issiunciama
  for (i=0;i<5;i++)

  {

  zinute.pucMsgData = &duomenys[i];   // rodykle i duomenis
  zinute.ulMsgLen = sizeof(duomenys[i]);  // siunciamu duomenu ilgis
  CANMessageSet(CAN0_BASE, 1, &zinute, MSG_OBJ_TYPE_TX);
  SysCtlDelay(5 * SysCtlClockGet() / 3);  //5s uzlaikymas

  } 

}         


[code]

 

[Harald Kapp]

You should tell us which microcontroller this is for. It also would be a greta deal more helpful if the comments were in English.

Many microcontroller manufacturers have code examples for secific tasks (in your case CAN control) available on their websites. Have you had a lok into this?

 

[Wantas]

Ouh... ok.. I'm sorry.

so this is my microcontroller ---> http://www.ti.com/product/lm3s9b90
and I have to choose "Digital to analog converter" as a device which I have to connect to this microcontroller ...
and I have to use I2C interface.

and after this I have to make a code like this...

#include "inc/hw_memmap.h"
#include "inc/hw_ty pes.h"
#include "inc/hw_ints.h"
#include "inc/hw_can.h"
#include "driverlib/can.h"
#include "driverlib/interrupt.h"
#include "driverlib/sysctl.h"
#include "driverlib/gpio.h"
#include "utils/uartstdio.h"

int main(void)
{
tCANMsgObject message ;
int i = 0;
unsigned char data[30];

message.ulMsgID = 1; // CAN messages ID
message.ulMsgIDMask = 0; // ID filtration when you are using a mask
message.ulFlags = 0; // flag

//Synchronisation is determined by an external clock generator
SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_16MHZ);

//activating a general-purpose port D which is necessary for pins
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);

//establishing an alternative function for GPIO pins.
GPIOPinTypeCAN(GPIO_PORTD_BASE, GPIO_PIN_0 | GPIO_PIN_1);

// pins assigned CAN0 features
GPIOPinConfigure(GPIO_PD0_CAN0RX);
GPIOPinConfigure(GPIO_PD1_CAN0TX);

//CAN is switched on periphery
SysCtlPeripheralEnable(SYSCTL_PERIPH_CAN0);

// set the CAN Synchronisation
CANBitRateSet(CAN0_BASE, SysCtlClockGet(), 16000000);

//activating CAN
CANEnable(CAN0_BASE);

//assign (attribute) and send data every 5 seconds 
for (i=0;i<5;i++)

{

message.pucMsgData = &data[i]; //a pointer to the data
message.ulMsgLen = sizeof(data[i]); //Sending data length
CANMessageSet(CAN0_BASE, 1, &message, MSG_OBJ_TYPE_TX);
SysCtlDelay(5 * SysCtlClockGet() / 3); // 5s delay

}

}


[code]

so this code is for the task ---> CAN interface/CAN tranceiver ISO1050 [CAN1] (<--connected device)/ Data dispatch every 5 seconds,retrieving values.

and my task is ---> I2C interface/ DAC(Digital to analog converter)/ Recording every 0.5 seconds.

Can anybody make a short code for my task ???? please.

 

[Wantas]

So nobody can help me ?? ;?

 

[davenn]

That microcontroller is a pretty old one. I'm not familiar with it ... sorry cannot help

Dave