SPI.begin() does not set Clock HIGH in SPI_MODE3

[sebashb]

If SPI settings are set to SPI_MODE3 clock signal should idle at HIGH and before doing:
SPI.beginTransaction(LTC6811_SPI_config);
being
LTC6811_SPI_config = SPISettings LTC6811_SPI_config(SPISettings(500000, MSBFIRST, SPI_MODE3));
the clock is idling LOW (after doing SPI.begin();).

The problem of this behaviour is that the first message is ignored by the slave. After doing SPI.beginTransaction(LTC6811_SPI_config); for the first time the clock will start idling at HIGH as expected.

[sebashb]

Actually I now think that this is the intended behaviour because SPI is a multi device bus protocol.
See https://forum.pjrc.com/threads/55183-SPI-begin()-does-not-set-Clock-HIGH-in-SPI_MODE3?p=198395#post198395

[sandeepmistry]

Hi @sebasqure,

What board are you seeing the issue on?

Also, based on your last comment can this issue be closed?

[sebashb]

Hi @sandeepmistry ,

The board is a Teensy 3.2.

If you think that this is the intend behaviour, yes you can close it.

[sandeepmistry]

Hi @sebasqure,

I would suggest you open an issue here: https://github.com/PaulStoffregen/cores