I am using a STM32L476VG (100 pin package, VREF+ not bonded to VDDA) for a mixed signal design. I planed to use the VREF+ as a 2.048V reference output. Currently there is no load on the VREF+ pin.
Unfortunately I always get a HAL_TIMEOUT while waiting for the VRR bit in the VREFBUF CSR register:
if (HAL_SYSCFG_EnableVREFBUF() != HAL_OK)
Also no voltage output is measureable at the VREF+ pin...
Do I miss something here? I tried to change the order or manually set the registers (without time-out) but no output at all.
Thank you for your help!!