I defined a group and two sub groups in a .h file:
/**
* @defgroup groupDriver Drivers
* @ingroup groupDriver
* @{
* @defgroup groupSPI SPI
* @defgroup groupUART UART
* @}
*/
And then use doxygen and Miktex to generate a pdf file. I expect a bookmarker in the Modules Documentation Chapter like:
Drivers
--SPI
--UART
but in fact a wrong bookmarker is generated:
Drivers
SPI
UART
However, in the Module Index Chapter their hierarchy is right.