All 0xFF - Githubissues

rambo / TinyWire

My modifications to TinyWire Arduino libs

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All 0xFF #15

Closed steowens closed 8 years ago

steowens commented 8 years ago

For some reason I am getting all 0xFF on the master side when calling this library. I am using ATTiny84 with Rambo TinyWireS, on the slave side. And using standard Arduino Wire Library on a Arduino Pro Mini as master.

rambo commented 8 years ago

Post you code from both the slave and master, make sure you have external pull-up resistors.

steowens commented 8 years ago

Sorry to take so long to get back to you. We ended up figuring out how to get the project to work, but I honestly cannot remember now which tiny wire library we used. We did have to revert to sending single character messages though.

variablo commented 8 years ago

I get also no response.

bootloder for ATtiny84 8Mhz is Burned and uploaded
example attiny85_i2c_slave.ino is compiled for ATtiny84 and uploaded
for Master i use BusPirate V3.6 with pull-up resistors

If i start the Makro BusPirate "Searching 7bit I2C address space" i get no adress back. And if I send [9 rrrr] i get I2C START BIT WRITE: 0x09 NACK READ: 0xFF READ: ACK 0xFF READ: ACK 0xFF READ: ACK 0xFF NACK I2C STOP BIT

rambo commented 8 years ago

On 17/05/16 16:03, variablo wrote:

I get also no response.

bootloder for ATtiny84 8Mhz is Burned and uploaded

example attiny85_i2c_slave.ino is compiled for ATtiny84 and uploaded

for Master i use BusPirate V3.6 with pull-up resistors

Haven't tested that revision but at least my old bus pirate bit-bangs the I2C protocol and cannot handle clock stretching. Try with something that has proper hardware I2C master, like Arduino. There's a simple REPL-style client linked in the examples.