Do you want to toggle the using GPIF clock source? Is so, you can do this in the GPIF state machine. You can do a DR_GPIO action to drive the status or toggle the GPIO. Please try.
Thanks Nishant, this what I ended up doing: I added an additional state transition to an idle state which is triggered by the Firmware trigger. While in the firmware triggered state the GPIO output signal is asserted. Now I can produce a GPIF clock synchronous trigger while the GPIF is in this idle state. However I will have to be able to assert this trigger signal independent of the state, as the next measurement should be triggered during transmission of the current measurement. Is there a way to create a second independent state machine for forwarding the firmware trigger, or some neat way to implement this rather than having a firmware trigger asserted copy of each state?