LY_KL26Z板学习之I2C总线的24C64

chifen · 发表于 2015-10-4 11:05:31

这个功能是在原有的I2C功能上更改的,原板用的是AT24C02, 页写和地址方式的AT24C64有些区别,这里做子一些改动1, 先在硬件上的 AT24C02更换成 AT24C64,如果不好更换可以外接, 地址线要做一下处理 ,第是A0要接VCC与原有的板子地址不能一样
2, 在源码地改成写入地址方式
附源码:

/*******************************************************************/
/*!
* Write a byte of Data to specified register on MMA7660
* @param u8RegisterAddress is Register Address
* @param u8Data is Data to write
* C64芯片 unsigned char u8RegisterAddress 更换成 unsigned int u8RegisterAddress
*/
void I2C0WriteMultiRegister(unsigned char SlaveAddr, unsigned int u8RegisterAddress, char *u8Data, unsigned int length)
{
uint16 i;
/* send data to slave */
//MWSR =write MRSW =read
IIC0_StartTransmission(SlaveAddr,MWSR);
i2c0_Wait();//等待
//要写入的地址高位
I2C0_D = u8RegisterAddress>>8;
i2c0_Wait();
//要写入地址低位
I2C0_D = u8RegisterAddress;
i2c0_Wait();
//进入连续写入内容，这里和芯片的页写有关系，如果是C02 每次最多只能写入8个字节
//如果是C64 ，每次可以最多写入 32个字节内容
for(i=0; i<length; i++)
{
I2C0_D = u8Data[i];
i2c0_Wait();
}
i2c0_Stop();
Pause(7);
//Pause(50);
}

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2,在读取的地方更改

/*******************************************************************/
/*!
* Read first three registers from the MMA7660
* @param u8RegisterAddress is Register Address
* @return Data stored in Register
* C64芯片 unsigned char u8RegisterAddress 更换成 unsigned int u8RegisterAddress
*/
unsigned char I2C0ReadMultiRegisters(unsigned char SlaveAddr, unsigned int u8RegisterAddress, unsigned char bytes, char buf[])
{
unsigned char n=bytes;
int i;
// Send Slave Address 从机地址
IIC0_StartTransmission(SlaveAddr,MWSR);
i2c0_Wait();
// Write Register Address 要写入的地址，这里如果是C02到C08用一位地址方式，如果是16或C256是双位地址
//这里的 u8RegisterAddress 地址更改会16位双8位地址
/* Write Register Address */
I2C0_D = u8RegisterAddress>>8;
i2c0_Wait();
I2C0_D = u8RegisterAddress;
i2c0_Wait();
/* Do a repeated start */
I2C0_C1 |= I2C_C1_RSTA_MASK;
/* Send Slave Address */
I2C0_D = (EEPROM_I2C_ADDRESS << 1) | 0x01; //read address
i2c0_Wait();
/* Put in Rx Mode */
I2C0_C1 &= (~I2C_C1_TX_MASK);
/* Ensure TXAK bit is 0 */
I2C0_C1 &= ~I2C_C1_TXAK_MASK;
/* Dummy read */
result[0] = I2C0_D ;
i2c0_Wait();
for(i=0;i<n-2;i++)
{
/* Read first byte */
buf[i] = I2C0_D;
i2c0_Wait();
}
/* Turn off ACK since this is second to last read*/
I2C0_C1 |= I2C_C1_TXAK_MASK;
/* Read second byte */
buf[i++] = I2C0_D;
i2c0_Wait();
/* Send stop */
i2c0_Stop();
/* Read third byte */
buf[i++] = I2C0_D;
// printf("%3d %3d %3d\n",result[0],result[2],result[4]);
return result[0];
}

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3,在main()做测试

/*********************************************************************************************************
** Function name: main
** Descriptions: I2C驱动EEPROM AT24C02 Demo
** input parameters: none
** output parameters: none
** Returned value: none
** Created by:
** Created Date:
**--------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
*********************************************************************************************************/
int main (void)
{
char ucData[64] = {0x00};
INT8U i = 0;
SystemCoreClockUpdate();
SIM_SCGC5 |= (SIM_SCGC5_PORTA_MASK /* 管脚时钟初始化 */
| SIM_SCGC5_PORTB_MASK
| SIM_SCGC5_PORTD_MASK
| SIM_SCGC5_PORTE_MASK );
uart0Init(9600,0,0,8,1);
printf("IIC Test start\r\n"); /* I2C外设初始化 */
init_I2C0();
IO_FUN_SEL(MKL_PORTB,18,1); /* LED5,6,7初始化 */
IO_FUN_SEL(MKL_PORTB,19,1);
IO_FUN_SEL(MKL_PORTD,1,1);
GPIO_DDR_OUTPUT(MKL_PORTB,18);
GPIO_DDR_OUTPUT(MKL_PORTB,19);
GPIO_DDR_OUTPUT(MKL_PORTD,1);
GPIO_CLR(MKL_PORTB,18); //D5亮，程序开始
GPIO_SET(MKL_PORTB,19);
GPIO_SET(MKL_PORTD,1);
for (i = 0; i < 64; i++) { /* 数组初始化 */
ucData[i] = i;
}
printf("Now Start Write ...\n");
I2C0WriteMultiRegister(EEPROM_I2C_ADDRESS, 0x00, ucData,64);
for (i = 0; i <64; i++) { /* 数组初始化 */
ucData[i] = 0;
}
printf("Now Start Read...\n");
/* 读数据操作 */
I2C0ReadMultiRegisters(EEPROM_I2C_ADDRESS, 0x0000, 64,ucData);
printf("Now Start verify...");
for (i = 0; i < 64; i++) {
if (ucData[i] != i) {
GPIO_TOGGLE(MKL_PORTB,19); /* 验证失败，D6亮 */
printf("ERR!");
while (1);
}
} /* 验证正确，D7亮 */
GPIO_TOGGLE(MKL_PORTD,1);
printf("OK!");
while(1);
}