Hi, TI expert:
I found that when burning the firmware via USB, the main time-consuming part was the USB transmission process. From the information, it can be seen that it took a total of 144.7 seconds to burn a 16MB file. The time spent on writing to the flash memory was approximately 40 seconds.
Why is the default tinyusb download rate so slow? The default clock frequency is 25 MHz. When it is changed to 50 MHz, it fails to function properly.