Hi,
I am working on implementation of I2C driver for both MPC8540(A) &
MPC8560(B) in Master Mode scenarios. The problem I am facing is given below
If I read any buffer part via I2C bus from A to B continuously,the driver is
working fine. However during this processing ,if B tries to read any buffer
register from A the bus will goes into low state (both SCL and SDA are low).The
error that it was showing are mainly NO ACK and Remote IO errors. After this I
suspect that it may be the problem form slave receive function that I
implemented. The reference Manual says that you have to set I2CCR[TXAK] bit
after slave receive finishes. But how does slave knows wether this will last
byte of transaction.Only Master have this knowledge. The slave implementation
is as follows:-
#ifdef CONFIG_MPC_I2C_SLAVE
// lost arbitration?
if ((priv->read(&priv->regs->i2csr) & MPC_I2CSR_MAL))
{
priv->write(&priv->regs->i2csr, 0,
MPC_I2CSR_MAL);
if ((priv->read(&priv->regs->i2csr) &
MPC_I2CSR_MAAS))
{
mpc_slave_address_match(priv);
}
}
else
{
if ((priv->read(&priv->regs->i2csr) &
MPC_I2CSR_MAAS))
{
mpc_slave_address_match(priv);
}
else if ((priv->read(&priv->regs->i2ccr) &
MPC_I2CCR_MTX))
{
mpc_slave_tx(priv);
}
else
{
mpc_slave_rx(priv);
}
}
#endif
}
static inline void mpc_slave_rx(struct mpc_i2c_private *priv)
{
buffer = priv->read(&priv->regs->i2cdr);
-------------Some Montavista Event Broker Part-----------
}
Since I am new in I2C functionality, Please point out any mistake I was doing.
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