原创 MCF52259 I2Cdemo

/*********************************************************
@ Nicrosystem Freescale coldfire MCF52259 Development Board
@ NSCF52259-R1
@ author:bluehacker<nicrosystem@gmail.com>
@ date:2009-12-01
**********************************************************/
#include "support_common.h" /* include peripheral declarations and more */
#include "i2c_driver.h"

void init_i2c()
{
 unsigned char temp;
 
 MCF_GPIO_PASPAR  |=MCF_GPIO_PASPAR_SCL0_SCL0 |MCF_GPIO_PASPAR_SDA0_SDA0 ;
 MCF_I2C_I2FDR(0)=MCF_I2C_I2FDR_IC(0x3A);//about 100khz
 MCF_I2C_I2ADR(0)=0xf0;
 MCF_I2C_I2CR(0)=0x80;//enable i2c
// MCF_I2C1_I2CR=0;
 if(MCF_I2C_I2SR(0)&MCF_I2C_I2SR_IBB)
 {
  MCF_I2C_I2CR(0)=0x0;
  MCF_I2C_I2CR(0)=MCF_I2C_I2CR_IEN |  /* enable module */
        MCF_I2C_I2CR_MSTA;
  temp=MCF_I2C_I2DR(0);
  MCF_I2C_I2SR(0)=0;
  MCF_I2C_I2CR(0)=0x0;
  MCF_I2C_I2CR(0)=0x80;//enable i2c
 }
}

void i2c_start()
{
 while(MCF_I2C_I2SR(0)&MCF_I2C_I2SR_IBB);
 MCF_I2C_I2CR(0)|=MCF_I2C_I2CR_MTX ;
 MCF_I2C_I2CR(0)|=MCF_I2C_I2CR_MSTA ; 
}

unsigned char i2c_send_byte(unsigned char c)
{
// MCF_I2C0_I2CR|=MCF_I2C_I2CR_MTX ;
// if(MCF_I2C0_I2SR|MCF_I2C_I2SR_IAL)
// {
  //arbitration lost
//  MCF_I2C0_I2SR&=~MCF_I2C_I2SR_IAL ;
// }
// i2c_start();
// MCF_I2C_I2CR(0)|=MCF_I2C_I2CR_MTX ;
// MCF_I2C_I2CR(0)|=MCF_I2C_I2CR_MSTA ;
 MCF_I2C_I2DR(0)=c;
 while((MCF_I2C_I2SR(0)&MCF_I2C_I2SR_IIF)==0)
 {
  
 }

 MCF_I2C_I2SR(0)&=~MCF_I2C_I2SR_IIF;
 if(MCF_I2C_I2SR(0)&MCF_I2C_I2SR_RXAK) 
  return 1;//failed
 else
     return 0;//success
}

unsigned char i2c_recv_byte(unsigned char ack)
{
 unsigned char temp;
 if(ack>0)
 {
  MCF_I2C_I2CR(0)|=MCF_I2C_I2CR_TXAK; 
 }
 else
 {
  MCF_I2C_I2CR(0)&=~MCF_I2C_I2CR_TXAK;  
 }
 
 MCF_I2C_I2CR(0)&=~MCF_I2C_I2CR_MTX ;
 temp=MCF_I2C_I2DR(0); 
 while((MCF_I2C_I2SR(0)&MCF_I2C_I2SR_IIF)==0)
 {
  
 }
 MCF_I2C_I2SR(0)&=~MCF_I2C_I2SR_IIF;
 temp= MCF_I2C_I2DR(0);
 while((MCF_I2C_I2SR(0)&MCF_I2C_I2SR_IIF)==0)
 {
  
 }
 MCF_I2C_I2SR(0)&=~MCF_I2C_I2SR_IIF;
 return temp;
}

void i2c_stop()
{
 MCF_I2C_I2CR(0)&=~MCF_I2C_I2CR_MSTA ; 
}

void i2c_restart()
{
 MCF_I2C_I2CR(0)|=MCF_I2C_I2CR_RSTA;
}

/*********************************************************
@ Nicrosystem Freescale coldfire MCF52259 Development Board
@ NSCF52259-R1
@ author:bluehacker<nicrosystem@gmail.com>
@ date:2009-12-01
**********************************************************/
/*
 * main implementation: use this sample to create your own application
 *
 */
#include "support_common.h" /* include peripheral declarations and more */
#if (CONSOLE_IO_SUPPORT || ENABLE_UART_SUPPORT)
/* Standard IO is only possible if Console or UART support is enabled. */
#include <stdio.h>
#endif
#include "uart.h"
#include "i2c_driver.h"
#include "at24c02.h"
#include "delay.h"

int main(void)
{
 int counter = 0;
 char ch="0";
 uint8 ret="0";
 char buf[50];
 uint8 addr="0";

#if (CONSOLE_IO_SUPPORT || ENABLE_UART_SUPPORT)
 printf("Hello World in C from MCF52259 derivative on MCF52259 board\n\r");
 fflush(stdout);
#endif
 uart_init(0,80000,19200);
 pit_init(0);
 init_i2c();
 uart_putstr(0,(char*)("Nicrosystem NSCF52259R1 i2cdemo start....\n"));
 
 for(;;) {   
     counter++;
     ch=uart_getchar(0);
     sprintf(buf,"received:%d\n",ch);
     uart_putstr(0,buf);
     ret=at24c02_write((uint8*)(&ch),1,addr);
     if(ret)
     {
      sprintf(buf,"Write ADDR#%d failed\n",addr);
      uart_putstr(0,buf);
     }
     else
     {
      sprintf(buf,"Write ADDR#%d success\n",addr);
      uart_putstr(0,buf);
     }
     ch=0;
     ret=at24c02_read((uint8*)(&ch),1,addr);
     if(ret)
     {
      sprintf(buf,"Read ADDR#%d failed\n",addr);
      uart_putstr(0,buf);
     }
     else
     {
      sprintf(buf,"Read ADDR#%d success, get:%d\n",addr,ch);
      uart_putstr(0,buf); 
     }
     addr++;
     
 }

}