Naoya Muramatsu

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11 years, 8 months ago.

Can the same mbed be at the same time, slave and master(I2C)?

Hi

I am using just for testing both I2C Ports like this:

I2CSlave slave(p9, p10);

I2C i2c(p28, p27);

but it seems that the slave isnt acknowledging the master?

Why?

2 Answers

Marco Schuler
10 years, 10 months ago.

I get the same problem with the Nucleo152RE.

Looking at the HAL-Code in github shows me that they are doing nasty stuff with a global variable called I2cHandle. they do not update it correctly to allow more than one instance of i2c (slave or master).

Very bad...

Nat Bon
10 years, 10 months ago.

Hello, I'm working on Nucleo F411RE. I have the same problem : I2C (master) alone talks without (too much) problems. I2CSlave alone talks, but this does not work :

I2C master(PIN1, PIN2);
I2CSlave slave(PIN3, PIN4);

while (tempo)
   slave.receive() /// Receives data
...
master.write(something); /// Works correctly
...
while(True)
   slave.receive() // Does not receive anymore

Has anyone a clue ? Thank you ...

Btw, I'm looking for a slave which would work by interrupts ... executing only on master's request ... Does not exist on MBed Nucleo ?