ChibiOS Free Embedded RTOS

After a lot of headache I finally found that a different i2c config works, at least it doesn't stop after the first byte.
I found this on a post from someone who also had problems running the STM32F4 with STD_DUTY_CYCLE.


/* this didn't work
static const I2CConfig i2c1cfg =
{
OPMODE_I2C,
100000 ...

I think I figured out I'm reading the trace incorrectly. Only the 9th rising edge of sda should be at gnd level for the ack.
From and i2c tutorial I found "If the receiving device sends back a low ACK bit, then it has received the data and is ready to accept another byte"

Shouldn't the ack have a ...

4.7K pullups on both lines.

The first scope screenshot shows the rise and fall time of the signals. From what I've read within spec for 100KHz timing.
It's a stm32f4discovery board and the pins I'm using are marked as free in the user manual.

Anything unusual in the code?

I'm trying to write to a 24lc256 with all the address pins at ground, it should have an address of 0x50. When I call i2cMasterTransmitTimeout I see the correct start bit and address and I think that the ACK is there but only the first byte is sent over the bus and i2cGetErrors responds with a value ...