Hello, has somebody successfully used the twi (hardware) on one of the (relatively new) tiny-x04 chips? I'm stuck already while trying to issue a start-condition/transmit slave address: After the suggested initialisation (datasheet) i'm writing TWI0.MADDR (slave-mode) and then waiting for the WIF flag in TWI0.MSTATUS to get set, but it never gets set. I didn't hook it up to an oszi to check wether it starts to write the address anyways, but i suspect it doesn't. I also took a look into the datasheets of related Devices (414, 817...) and went through an (quite overengineered) example on start.atmel.com - but didn't find any obvious difference in the end. So maybe i'll revert to bit-banging but i'm just curious: Did someone succeed with the hardware-twi on one of those chips? Cheers, Achim
Sorry, i accidentally wrote
>> i'm writing TWI0.MADDR (slave-mode)
but of course i'm using master-mode!
Achim
Solved it! My misconception was that the WIF-flag in TWI0.MSTATUS would get always set after a write to TWI0.MADDR to indicate that the transmission of the address was finished (the datasheet is a bit fuzzy about that) Instead it depends on wether you do a write or a read access (bit 0 of address either 1 or 0). If you do a read access the WIF-flag will not get set after transmitting the address, the master just proceeds with reading one byte from the slave an then sets the RIF-flag. So you have to check that flag (instead of WIF) when doing a read-access (of course the same applies when you're using irq's instead of simply polling the flags) Here's the link that helped me to get on track: https://www.avrfreaks.net/comment/2568566#comment-2568566 Achim
Watch this topic
Disable multi-page viewPlease log in before posting. Registration is free and takes only a minute.
Existing account
Do you have a Google/GoogleMail account? No registration required!
Log in with Google account
Log in with Google account
No account? Register here.