rambo/TinyWire

All 0xFF

steowens opened this issue · 4 comments

steowens commented

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

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

steowens commented

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

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

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.

  • 👍1