Why is SAML22 I2C with DMA not transmitting more than 1 byte?

[m4l490n]

Hello everybody

I'm starting with Atmel SAML microcontroller and I'm implementing the code example "Quick Start Guide for Using DMA with SERCOM I2C Master" http://asf.atmel.com/docs/3.21.0/samd21/html/asfdoc_sam0_sercom_i2c_master_dma_use_case.html and I'm having problems with it. I hooked up a logic analyzer to the bus and I'm observing that the peripheral just sends 1 byte, actually I can just see the address of the chip being sent and no bytes of the data I need to send.
 
Has anyone implemented I2C communications using DMA? I need advice here because I just implemented the example exactly as found in the quick start guide and is not working. It is supposed to be sending 10 bytes.
 
Thanks!!

[KL27x]

Logic analyzer shows
1. Start bit
2. Slave address ending with 0 (if 7 bit address, MSBs are the address, LSB is the R/W bit, which is zero for write)
And then..
3. ??

ACK or NACK? If NACK, that's as far as you will get. Double check the address is correct and the circuit is ok.

If you got an ACK, circuit is ok. Software/peripheral problem. Does this module trigger ISR? Did you set up your ISR?

exactly as found in the quick start guide

I hope you at least modified the slave address... What are you communicating with? It is up to the slave to ACK after the address has been sent. You can't "dry run" it without an actual working slave.