FMPI2C DMA read function is not working

[Team-RCVA]

 Hi!

I try to read data from an I2C device using DMA. I use a STM32-F412ZG nucleo board.

First I try to write without DMA :

HAL_FMPI2C_Mem_Write(&hfmpi2c1, 0x52, 0x7fff, FMPI2C_MEMADD_SIZE_16BIT, tab, 1, 1000);

Then I want to read data using DMA with:

HAL_FMPI2C_Mem_Read_DMA(&hfmpi2c1, 0x52, 0x0, FMPI2C_MEMADD_SIZE_16BIT, tab, 1);

Here is what i get with the osciloscope:

The first part corresponds to the write and works correctly. The second part corresponds to the read function, but the address of the register should be a16 bit sequence, but i only get the first byte, then the I2C bus is stuck (sclk stays at 0V).

I tested the same thing using I2C instead of FMPI2C, and all works correcly.

Did I miss something in my code? the full project is attached.

Léonard G

[TDK]

Your second transaction is a write, not a read. Sure that's the transaction that corresponds to HAL_FMPI2C_Mem_Read_DMA?

Does the non-DMA version work? HAL_FMPI2C_Mem_Read. If so, probably the DMA can't access the region where the memory is at. What's the address of tab?