I2c Stop bit problem

[leonardo.araujo]

Hi My name is Leonardo and I having some problems with I2C Comunication I having a PIC16f876 as Master and a 16F877 as Slave 1
and a 16f876 as Slave 2 When I send a i2c_write to Slave1 the communications are well , but when I send to Slave 1 and then to Slave 2 is like that i2c_stop never occurs keeping the sdi and scl low (or high) indefinelly

Does someone knows or have implemented i2c with 2 or more Slaves?

[Al]

Hi Leonardo,
Before issuing an i2c_stop you need to issue a no-acknowledge with your last communication before the i2c_stop. For example after doing a series of i2c_reads (issuing an 'acknowledge' each time) as follows.

AckBit = 1;// issue an 'acknowledge'
readRegisterValue = i2c_read(AckBit);
readRegisterValue = i2c_read(AckBit);
readRegisterValue = i2c_read(AckBit);


Before issuing the i2c _stop - issue a no-acknowledge

AckBit = 0;// issue no-acknowledge
readRegisterValue = i2c_read(AckBit);
i2c_stop();
_________________
Alan Murray