Posted on May 21, 2005 at 03:47Hi,
Im not using ST EEPROM but of ohter type. However, the routines are very useful as Im am able to understand the way the routines are called.
Currently, im able to read byte and write byte and also do acknowledge polling to check if the write operation is complete.
int main()
{
....
while(1)
{
receive = EEPROM_byte_read(1,0xf000);
}
}
u8 EEPROM_byte_read(u8 chip_select, u16 address)
{
u8 I2C_Rx_byte,control_byte;
u16 I2CStatus;
I2C_STARTGenerate (I2C0, ENABLE); //START bit.
while (I2C_FlagStatus (I2C0,DIRECT,I2C_SB) == RESET);
control_byte = 0xa0 | (0x0f &(((0x03 & chip_select) << 1)|((address & 0x8000) >> 12)));
I2C_AddressSend (I2C0, control_byte, I2C_Mode7, I2C_TX);
do{
I2CStatus = I2C_GetStatus(I2C0);
}while(!( I2CStatus & I2C_EVF ));
while (I2C_FlagStatus (I2C0,DIRECT,I2C_ENDAD )==RESET);
I2C_FlagClear (I2C0, I2C_ENDAD);
I2C_ByteSend (I2C0, address >> 8);
I2C_ByteSend (I2C0, address);
I2C_STARTGenerate (I2C0, ENABLE);
while (I2C_FlagStatus (I2C0,DIRECT,I2C_SB) == RESET);
I2C_AddressSend (I2C0, control_byte, I2C_Mode7, I2C_RX);
do{
I2CStatus = I2C_GetStatus( I2C0 );
}while(!( I2CStatus & I2C_EVF ));
while( I2C_FlagStatus( I2C0, DIRECT, I2C_ENDAD ) == RESET );
I2C_FlagClear( I2C0, I2C_ENDAD );
if( !(I2CStatus & I2C_AF) );
{
do{
I2CStatus = I2C_GetStatus( I2C0 );
}while(!(I2CStatus & I2C_EVF));
I2C_Rx_byte = I2C_ByteReceive(I2C0);
}
I2C_STOPGenerate (I2C0, ENABLE);
return I2C_Rx_byte;
}
However, currently Im facing a problem that in the EEPROM read byte routine function, if Im to run it, the program will run the function EEPROM_byte_read once, then the next time it runs the function, it will hang on the
while (I2C_FlagStatus (I2C0,DIRECT,I2C_SB) == RESET);
in the EEPROM_byte_read() function.
But when I step thru it , it can detect the ST bit, the it will go out from the while loop. So, if I run the program it will hang there but if step thru it, it will run smoothly.
Pls advise.
Rgrds,
ongth60
