I'm looking to develop an ultrasonic time-of-flight (ToF) sensor and have been looking at high speed timing circuits. Many versions use the TDC7200, but ST offers the STM32F334 which has a high-resolution timer with apparent 217ps resolution.
What I'm wondering whether this timer can actually be used to measure time with 217ps between each count value (assuming it's run at maximum clock rate)?
Does anyone have experience using this microcontroller's high-resolution timer like this?
According to the reference manual it should be possible:
High-Resolution Timer (HRTIM) : For control and monitoring purposes, the timer has also timing measure capabilities and links to built-in ADC and DAC converters. Last, it features light-load management mode and is able to handle various fault schemes for safe shut-down purposes. --page 626
The timing unit has the capability to capture the counter value, triggered by internal and external events. The purpose is to: • measure events arrival timings or occurrence intervals --page 641
