原创 NSCF52259-R1开发板demo---读写eeprom

这是我们开发的飞思卡尔coldfire系列开发板中的一款，基于飞思卡尔新近推出的一站式链接解决方案MCF52259，该款MCU功能齐全，性能强大，在最近的EDN评选中还荣获大奖。我们针对目前国内还没有见到有相应开发板的现状，开发了此款低成本开发板，与飞思卡尔官方的EVB功能相当，但价格仅是其1/4还不到，接来下来我们将陆续贴出该开发板的一些demo例程，希望对大家有用。

这是第一帖：利用MCF52259片上i2c 控制器读写常用的at24c02 eeprom

//filename: i2c_driver.h

//mcf52259 i2c驱动头文件

#ifndef _NICROSYSTEM_NSCF52259R1_I2C_DRIVER_H_
#define _NICROSYSTEM_NSCF52259R1_I2C_DRIVER_H_

void init_i2c();

void i2c_start();
unsigned char i2c_send_byte(unsigned char c);
unsigned char i2c_recv_byte(unsigned char ack);
void i2c_stop();
void i2c_restart();
#endif

//Filename: i2c_driver.c

//MCF52259 I2c驱动

#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;
}

//Filename: uart.h

//串口驱动头文件

#ifndef _NICROSYSTEM_NSMCF52259R1_UART_H_
#define _NICROSYSTEM_NSMCF52259R1_UART_H_
#include "support_common.h"

void uart_putstr(uint8 channel, char *str);
void uart_putchar (uint8 channel, char ch);
char uart_getchar (uint8 channel);
void set_gpio_uart(uint8 channel);
uint8 uart_init(uint8 channel,uint32 sysClockKhz,uint32 baudRate);

#endif

//filename:uart.c

//串口驱动

#include "uart.h"

uint8 uart_init(uint8 channel,uint32 sysClockKhz,uint32 baudRate)
{
 uint16 ubgs;
 
 if(channel>2)
 {
  return 1;//error
 }
 set_gpio_uart(channel);
 /*
  * Reset Transmitter
  */
 MCF_UART_UCR(channel) = MCF_UART_UCR_RESET_TX;

 /*
  * Reset Receiver
  */
 MCF_UART_UCR(channel) = MCF_UART_UCR_RESET_RX;

 /*
  * Reset Mode Register
  */
 MCF_UART_UCR(channel) = MCF_UART_UCR_RESET_MR;

 /*
  * No parity, 8-bits per character
  */
 MCF_UART_UMR(channel) = (0
  | MCF_UART_UMR_PM_NONE
  | MCF_UART_UMR_BC_8 );

 /*
  * No echo or loopback, 1 stop bit
  */
 MCF_UART_UMR(channel) = (0
  | MCF_UART_UMR_CM_NORMAL
  | MCF_UART_UMR_SB_STOP_BITS_1);

 /*
  * Set Rx and Tx baud by SYSTEM CLOCK
  */
 MCF_UART_UCSR(channel) = (0
  | MCF_UART_UCSR_RCS_SYS_CLK
  | MCF_UART_UCSR_TCS_SYS_CLK);

 /*
  * Mask all UART interrupts
  */
 MCF_UART_UIMR(channel) = 0;
 
 /*
  * Calculate baud settings
  */
 ubgs = (uint16)((sysClockKhz * 1000)/(baudRate * 32));

 MCF_UART_UBG1(channel) = (uint8)((ubgs & 0xFF00) >> 8);
 MCF_UART_UBG2(channel) = (uint8)(ubgs & 0x00FF);
 /*
  * Enable receiver and transmitter
  */
 MCF_UART_UCR(channel) = (0
  | MCF_UART_UCR_TX_ENABLED
  | MCF_UART_UCR_RX_ENABLED);
 
 return 0;//success
}

void set_gpio_uart(uint8 channel)
{
 switch(channel)
 {
  case 0:
  MCF_GPIO_PUAPAR|=MCF_GPIO_PUAPAR_UTXD0_UTXD0 |
  MCF_GPIO_PUAPAR_URXD0_URXD0 |MCF_GPIO_PUAPAR_URTS0_URTS0 |
  MCF_GPIO_PUAPAR_UCTS0_UCTS0 ;
  break;
  
  case 1:
  MCF_GPIO_PUBPAR|=MCF_GPIO_PUBPAR_UTXD1_UTXD1  |
  MCF_GPIO_PUBPAR_URXD1_URXD1 ;
  break;
  
  case 2:
  MCF_GPIO_PUCPAR|=MCF_GPIO_PUCPAR_UTXD2_UTXD2  |
  MCF_GPIO_PUCPAR_URXD2_URXD2 ;
  break;
  
  default:
  break;
 }
 
}

/*
 * Wait for a character to be received on the specified UART
 *
 * Return Values:
 *  the received character
 */
char uart_getchar (uint8 channel)
{
    /* Wait until character has been received */
    while (!(MCF_UART_USR(channel) & MCF_UART_USR_RXRDY))
    {
     
    };

    return (char)MCF_UART_URB(channel);
}

/********************************************************************/
/*
 * Wait for space in the UART Tx FIFO and then send a character
 */
void uart_putchar (uint8 channel, char ch)
{
    /* Wait until space is available in the FIFO */
    while (!(MCF_UART_USR(channel) & MCF_UART_USR_TXRDY))
    {
     
    };

    /* Send the character */
    MCF_UART_UTB(channel) = (uint8)ch;
}

/*********************
* send a string using poll mode
*******************/
void uart_putstr(uint8 channel, char *str)
{
 while(*str!=0)
 {
  uart_putchar(channel,*str++);
 }
}

//filename: at24c02.h

//at24c02驱动头文件

#ifndef _NICROSYSTEM_NSCF52259R1_AT24C02_H_
#define _NICROSYSTEM_NSCF52259R1_AT24C02_H_
#include "support_common.h"

#define EEPROM_MAX_ADDR  256
#define WR24C02 0xA0
#define RD24C02 0xA1

unsigned char at24c02_write(unsigned char *buf,unsigned char num,uint8 addr);
unsigned char  at24c02_read(unsigned char *buf, unsigned char num, uint8 addr);
#endif

//filename:at24c02.c

//at24c02驱动

#include "i2c_driver.h"
#include "at24c02.h"
#include "delay.h"

/* write 24xxxx I2C EEPROM
* 参数:
* buf---包含待写入数据的缓冲区
* addr---eeprom起始地址
* num--数据长度
* 返回:
* 0---success
* 1---failed
* 2---invalid address
*/
unsigned char at24c02_write(unsigned char *buf,unsigned char num,uint8 addr)
{
 unsigned char i,ret;
 
 if(addr+num>EEPROM_MAX_ADDR)
  return 2;
 
 i2c_start();
 ret=i2c_send_byte(WR24C02);
 if(ret)
 {
  i2c_stop();
  return 1;
 }
 
 ret=i2c_send_byte(addr);
 if(ret)
 {
  i2c_stop();
  return 1;
 }

 for(i=0;i<num;i++)
 {
  if(i2c_send_byte(buf))
  {
   i2c_stop();
   return 1;
  }
 }
 i2c_stop();
 delay_ms(80000,0,5);
 return 0;
}
 
/*read 24xxxx I2C EEPROM
* arguments:
* buf---return  the data
* addr---address of cell you want to write
* num--the numner of data we want to read
* return:
* 0---success
* 1---failed
* 2---invalid address
*/
unsigned char  at24c02_read(unsigned char *buf, unsigned char num, uint8 addr)
{
 unsigned char i,ret;
 
 if(addr+num>EEPROM_MAX_ADDR)
  return 2;
 
 i2c_start();
 if(i2c_send_byte(WR24C02))
 {
  i2c_stop();
  return 1;
 }