Chip_I2C_MasterTransfer hangs out forever if the slave doesn't respond

[henrique-silva]

This mostly happens when the selected address is wrong, making the LPCOpen function hangs in the following loop:

while (Chip_I2C_MasterTransfer(id, &xfer) == I2C_STATUS_ARBLOST) {}

A solution would be to implement a timeout on this function

[qermit]

Not a timeout but correct i2c bus handling, In this case NAK (SLA+W/SLA+R) should be triggered.
xfer.status = I2C_STATUS_NAK will be returned and xfer.txSz should be not changed.

A code may hang in this state only if i2c interface has no pullup resistors or something is disturbing lines.