Posted on May 17, 2011 at 12:25Hello I dont get my code to work for reading from the M24 series memory. I got a 64kb version.
This is my write code and I think its working but I dont know, becuse I cant read from the memory to verify that.
void I2C_EE_ByteWrite(u8* pBuffer, u8 WriteAddr)
{
/* Send STRAT condition */
I2C_GenerateSTART(I2C1, ENABLE);
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
/* Send EEPROM address for write */
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
// send adress 2 times manual says so
/* Send the EEPROM's internal address to write to */
I2C_SendData(I2C1, WriteAddr);
/* Test on EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/* Send the EEPROM's internal address to write to */
I2C_SendData(I2C1, WriteAddr);
/* Test on EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/* Send the byte to be written */
I2C_SendData(I2C1, *pBuffer);
/* Test on EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/* Send STOP condition */
I2C_GenerateSTOP(I2C1, ENABLE);
}
For reading from the memory I dont really have a clue, but this is my code
and it doesnt work. Trying to read 1 byte, I want to read more bytes later but im trying just to read one byte right now.
/* ByteRead code */
void I2C_EE_ByteRead(u8* pBuffer, u8 ReadAddr)
{
// Check busy flag (dont know if I need that but just in case maybe)
I2C_CheckEvent(I2C1, I2C_FLAG_BUSY);
// Start
I2C_GenerateSTART(I2C1, ENABLE);
// Test EV5
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
// Send device adress should it be A0 here or A1? I have no cables to the
chip enable E0,E1,E2 ports.
I2C_Send7bitAddress(I2C1, 0xA0, I2C_Direction_Transmitter);
// Test EV6
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
// Clear EV6 by setting again the PE bit
I2C_Cmd(I2C1, ENABLE);
// Send address for reading
I2C_SendData(I2C1, 0x1);
// Test EV8
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
// Send address for reading
I2C_SendData(I2C1, 0x1);
// Test EV8
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
// Start
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(I2C1, 0xA1, I2C_Direction_Receiver);
// Inactive ACK
I2C_AcknowledgeConfig(I2C1, DISABLE);
// I doesnt go in there, what should I do here?
if(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))
{
*pBuffer = I2C_ReceiveData(I2C1);
}
// Stop
I2C_GenerateSTOP(I2C1, ENABLE);
I2C_AcknowledgeConfig(I2C1, DISABLE);
}
Please help me im getting gray hair on this one :-[
