Resolved! STM32F103RET6 bare metal SPI3
I have SPI1 working in bare metal on a 48 pin version of the same chip, but I am having difficulty with SPI3 migrating to a 64 pin. For reference, I have attached the most recent stm32f103x6.h file from the Cube MX F1 package (STM32Cube_FW_F1_V1.8.0...