TMC2208 UART cannot set mstep

[totti001]

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Hi,

I've just bought SKR E3 DIP board with tcm2208 v3.0 drivers. I've compiled the latest marlin. My problem is that the Z axis driver is not set as expected. It has mstep value always 8. I've changed the drivers between the slots and the result is same. I've read the status witn m122 v and this is the result: SENDING:M122 V X Y Z E GCONF 0x00:00:00:C0 0x00:00:00:C0 0x00:00:01:01 0x00:00:00:C0 IHOLD_IRUN 0x00:0A:17:0B 0x00:0A:17:0B 0x00:0A:17:0B 0x00:0A:1C:0E GSTAT 0x00:00:00:00 0x00:00:00:00 0x00:00:00:00 0x00:00:00:00 IOIN 0x20:00:03:41 0x20:00:03:41 0x20:00:03:41 0x20:00:01:41 TPOWERDOWN 0x00:00:00:80 0x00:00:00:80 0x00:00:00:80 0x00:00:00:80 TSTEP 0x00:0F:FF:FF 0x00:0F:FF:FF 0x00:0F:FF:FF 0x00:0F:FF:FF TPWMTHRS 0x00:00:00:00 0x00:00:00:00 0x00:00:00:00 0x00:00:00:00 TCOOLTHRS THIGH CHOPCONF 0x14:02:82:84 0x14:02:82:84 0x15:02:82:84 0x14:02:82:84 COOLCONF PWMCONF 0xC8:0D:0E:24 0xC8:0D:0E:24 0xC8:0D:0E:24 0xC8:0D:0E:24 PWM_SCALE 0x00:00:00:0D 0x00:00:00:0D 0x00:00:00:1B 0x00:00:00:10 DRV_STATUS 0xC0:0B:00:00 0xC0:0B:00:00 0xC0:17:00:00 0xC0:0E:00:00

As I can see the gconf is different at the z axis. But I don't know why. Do you have any suggestion?-

Thanks