AVR Freaks

I'm trying to implement TWI Master on a ATMEGA4808 

The device is a superb device, very rich on features, but the datasheet makes understanding thw TWI interface quite hard!

First the problem...

I'm trying read register 0 on a TAS5575M which is at address 0x34 (7 bit address)

I seem to be able to send the address byte with read-btit set no problem, but then nothing...

Here's my setup code:

static volatile uint8_t dummy_u8;

void i2c_master_init(void)
{
	PORTMUX.TWISPIROUTEA=PORTMUX_TWI0_DEFAULT_gc;
	TWI0.MBAUD = 70;
	TWI0.MCTRLB |= TWI_FLUSH_bm;
	TWI0.MSTATUS |= (TWI_RIF_bm | TWI_WIF_bm);
	
	i2c_master_enable();
}

void i2c_master_enable()
{
	TWI0.MCTRLA = TWI_ENABLE_bm;
	TWI0_MSTATUS |= TWI_BUSSTATE_IDLE_gc;
}

And then I send a start using this (sending 0x34 as the address):

uint8_t i2c_master_start(uint8_t addr)
{
	if ((TWI0.MSTATUS & TWI_BUSSTATE_gm) != TWI_BUSSTATE_BUSY_gc)
	{
		TWI0.MCTRLB &= ~(TWI_ACKACT_bm);
		TWI0.MADDR = addr;
		
		if (addr & 0x01)
		{
			// wait for RIF which means the ADDR byte in read mode has been sent.
			while (!(TWI0_MSTATUS & TWI_RIF_bm));
		}
		else
		{
			while (!(TWI0_MSTATUS & TWI_WIF_bm));
		}
		return TWI0.MSTATUS;
	}
	else
	return TWI0.MSTATUS;
}

And then I try to send the register address using this, with 0x00 as the data:

uint8_t i2c_master_write(uint8_t data)
{
	if ((TWI0.MSTATUS & TWI_BUSSTATE_gm) == TWI_BUSSTATE_OWNER_gc)
	{
		dummy_u8 = TWI0_MSTATUS;
		TWI0.MDATA = data;
		
		while(1)
		{
			dummy_u8 = TWI0_MSTATUS;
			if(dummy_u8 & TWI_WIF_bm)
			{
				break;
			}
		}
		
	}

	return TWI0.MSTATUS;
}

Now it just hangs in the while loop and MSTATUS stays stubbornly stuck at 0x22 

If I add a break point, so that it stops immedaitely after line "TWI0.MADDR = addr;" in i2c_master_start(), ie immediately after sending the Address Byte with Read Bit, my logic analyzer shows me this :

Which seems to be (almost) correct for a Read from a device at 0x34 - but what are all those extra clocks?

So not sure what is going on!

Anyone got any working TWI Master code for the 0-series I can compare with?