@@ -16,9 +16,9 @@ Both SCL and SDA lines have pull-ups in order to drive the signal up by default.
When the master wants to do an operation (a read or a write) on a parcticular slave, it:
1.generates a START condition, that means to drive to the low level the SDA while the SCL is still high;
1.Generates a START condition, that means to drive to the low level the SDA while the SCL is still high;
2. Communicate the address and the operation the master wants to perform. So, in _7-bit addressing_ the address is sent along with the operation bit, 0 for write and 1 for read. In 10-bit addressing there is also a header involved; for further informations see the reference manual.
3. If a slave recognizes his address, the slave pulls the SDA line down in order to send a slave ACK (S-ACK). So, in total, this prologue would be 7bits (slave address) + 1bit (R/W operation to perform) + 1bit (slave responds with an ACK or the line returns high, so a NACK is received).
3. If a slave recognizes his address, the slave pulls the SDA line down in order to send a slave ACK (S-ACK). So, in total, this prologue would be 7bits (slave address) + 1bit (R/W operation to perform) + 1bit (slave responds with an ACK or the line remains high, so a NACK is received).
After this phase, if a slave responds with an ACK, the operation will be performed:
