//******************************************************************
//Erasing EEPROM (filling it with databyte 0xff)
//******************************************************************
unsigned char EEPROM_erase(void)
{
unsigned char errorStatus;
unsigned int i;
errorStatus = i2c_start();
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
errorStatus = i2c_sendAddress(EEPROM_W);
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
errorStatus = i2c_sendData(0x00);
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
/*
errorStatus = i2c_sendData(0x00);
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
*/
for(i=0;i<256;i++)
{
errorStatus = i2c_sendData(0x00);
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
}
i2c_stop();
return(0);
}
int writeTo(byte _dev_address,byte address, byte val) {
int a=0;
a=i2c_beginTransmission(I2Ci,_dev_address,i2c_write); // start transmission to device
//usart_printfm(USART1,(const int *)"Writing to this device address: %2x\n\r",_dev_address);
if(a<0) return -1;
a=i2c_sendData(I2Ci,address); // send register address
if(a<0) return -1;
a=i2c_sendData(I2Ci,val); // send value to write
if(a<0) return -1;
while(I2C_GetFlagStatus(I2Ci,I2C_FLAG_BUSY)!=SET);
a=i2c_stopTransmission(I2Ci); // end transmission
return 0;
}
//******************************************************************
//Function to a character string to EEPROM
//******************************************************************
unsigned char EEPROM_write(unsigned char highAddress, unsigned char lowAddress, unsigned char* string)
{
unsigned char errorStatus, data;
errorStatus = i2c_start();
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
errorStatus = i2c_sendAddress(EEPROM_W);
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
/*
errorStatus = i2c_sendData(highAddress);
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
*/
errorStatus = i2c_sendData(lowAddress);
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
while(*string)
{
errorStatus = i2c_sendData(*(string++));
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
}
i2c_stop();
return(0);
}
//******************************************************************
//Function to read given number of bytes from EEPROM
//******************************************************************
unsigned char EEPROM_read(unsigned char highAddress, unsigned char lowAddress, unsigned char totalChar, unsigned char* string)
{
unsigned char errorStatus, i, data;
errorStatus = i2c_start();
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
errorStatus = i2c_sendAddress(EEPROM_W);
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
/*
errorStatus = i2c_sendData(highAddress);
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
*/
errorStatus = i2c_sendData(lowAddress);
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
errorStatus = i2c_repeatStart();
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
errorStatus = i2c_sendAddress(EEPROM_R);
if(errorStatus == 1)
{
i2c_stop();
return(1);
}
for(i=0;i<totalChar;i++)
{
if(i == (totalChar-1)) //no Acknowledge after receiving the last byte
*(string) = i2c_receiveData_NACK();
else
*(string) = i2c_receiveData_ACK();
if(*(string++) == ERROR_CODE)
{
i2c_stop();
return(1);
}
}
i2c_stop();
return(0);
}
int readFrom(byte _dev_address,byte address, int num, byte _buff[]) {
int a=0,i=0;
int timeout;
uint8_t flag1=0,flag2=0;
a=i2c_beginTransmission(I2Ci,_dev_address,i2c_write); // start transmission to device
if(a<0) return -1;
// usart_printfm(USART1,(const int *)"Reading from this device address: %2x\n\r",_dev_address);
a=i2c_sendData(I2Ci,address); // sends address to read from
if(a<0) return -1;
//usart_printfm(USART1,(const int *)"sent this data which is the address to read from: %2x\n\r",address);
// if(a<0)
// return (a-1);
//i2c_stopTransmission(I2Cx); // end transmission
// if(a<0)
// return (a-2);
a=i2c_beginTransmission(I2Ci,_dev_address,i2c_read); // start transmission to device
if(a<0) return -1;
//usart_printfm(USART1,(const int *)"Initiated the register read cycle: %2x\n\r",_dev_address);
// if(a<0)
// return a;
// request 6 bytes from device
if(num==1){
I2C_AcknowledgeConfig(I2Ci, DISABLE);
/* Test on I2C1 EV8 and clear it */
timeout = I2C_TIMEOUT_MAX; /* Initialize timeout value */
// wait until one byte has been received
while( !I2C_CheckEvent(I2Ci, I2C_EVENT_MASTER_BYTE_RECEIVED) ){
ms_delay(100);
if((timeout--)==0){
flag1 = I2Ci->SR1;
flag2 = I2Ci->SR2;
usart_printf(USARTx,"Flag1:%04x \n\r Flag2:%04x\n\r",flag1,flag2);
usart_printf(USARTx,"Failing at read nnack stage\n\r");
return -1;
}
}
// wait until one byte has been received
I2C_GenerateSTOP(I2Ci, ENABLE);
// read data from I2C data register and return data byte
_buff[i] = I2C_ReceiveData(I2Ci);
return 0;
}
if(num==2)
{
timeout = I2C_TIMEOUT_MAX;
// while(I2C_GetFlagStatus(I2Ci,I2C_FLAG_ADDR)!=SET){
// ms_delay(100);
// if((timeout--)==0){
// flag1 = I2Ci->SR1;
// flag2 = I2Ci->SR2;
// usart_printf(USARTx,"Flag1:%04x \n\r Flag2:%04x\n\r",flag1,flag2);
// usart_printf(USARTx,"Failing at reading 2 bytes stage\n\r");
// return ;
// }}
I2C_AcknowledgeConfig(I2Ci, DISABLE);
I2C_NACKPositionConfig(I2Ci, I2C_NACKPosition_Next);
timeout = I2C_TIMEOUT_MAX;
while(I2C_GetFlagStatus(I2Ci,I2C_FLAG_BTF)!=SET){
ms_delay(100);
if((timeout--)==0){
flag1 = I2Ci->SR1;
flag2 = I2Ci->SR2;
usart_printf(USARTx,"Flag1:%04x \n\r Flag2:%04x\n\r",flag1,flag2);
usart_printf(USARTx,"Failing at reading 2 bytes stage2\n\r");
return -1;
}}
i2c_stopTransmission(I2Ci);
_buff[i] = I2C_ReceiveData(I2Ci);
i++;
_buff[i] = I2C_ReceiveData(I2Ci);
num-=2;
// receive a byte
//usart_printfm(USART1,(const int *)"this byte read from accel: %2x\n\r",i);
return 0;
}
while(num>0) // device may send less than requested (abnormal)
if(num==3){
//_buff[i]=I2C_read_ack(I2Cx);
timeout = I2C_TIMEOUT_MAX;
while(I2C_GetFlagStatus(I2Ci,I2C_FLAG_BTF)!=SET){
ms_delay(100);
if((timeout--)==0){
flag1 = I2Ci->SR1;
flag2 = I2Ci->SR2;
usart_printf(USARTx,"Flag1:%04x \n\r Flag2:%04x\n\r",flag1,flag2);
usart_printf(USARTx,"Failing at reading 2 bytes stage2\n\r");
return -1;
}}
I2C_AcknowledgeConfig(I2Ci, DISABLE);
_buff[i]=I2C_ReceiveData(I2Ci);
i++;
num--;
while(I2C_GetFlagStatus(I2Ci,I2C_FLAG_BTF)!=SET)
{
ms_delay(100);
if((timeout--)==0){
flag1 = I2Ci->SR1;
flag2 = I2Ci->SR2;
usart_printf(USARTx,"Flag1:%04x \n\r Flag2:%04x\n\r",flag1,flag2);
usart_printf(USARTx,"Failing at reading 2 bytes stage2\n\r");
return -1;
}}
i2c_stopTransmission(I2Ci);
_buff[i]=I2C_ReceiveData(I2Ci);
i++;
_buff[i]=I2C_ReceiveData(I2Ci);
i++;
num-=2;
//usart_print(USART1,"This byte read from nack: %2x\n\r",i);
return 0;
}
else{
a=I2C_read(I2Ci,_buff[i]);
if(a<0) return -1;
i++;
num--;
}
// if(i != num){
// status = ADXL345_ERROR;
// error_code = ADXL345_READ_ERROR;
// }
//ms_delay(10);
//i2c_stopTransmission(I2Cx); // end transmission
//end :
// usart_printf(USARTx,"Error occured !! Restarting the interface!!");
// ms_delay(5000);
// return -1;
return 0;
}
