libopencm3-examples VS STM32-base

What is the relationship between the data packets? I went through a mouse emulation example and the first field seems to be the "mouse" reporting. But, following that example convention, do the buttons come first, needing "my amount" of buttons in bits (in my case, 35 buttons is 6 bytes of data), then the axes with 12 bytes taken up (2 bytes for each value of 6 axes)?

I have had success creating a PWM using a different general purpose timer on a different GPIO. So I am pretty sure I got the basic configuration correct. What throws me off a little is the fact, that Channel 2N (CH2N) seems to share registers with Channel 2 (CH2). They seem to be complementary somehow. So I stayed close to [this example]([https://github.com/libopencm3/libopencm3-examples/blob/master/examples/stm32/f1/stm32-h103/pwm_6step/pwm_6step.c) for the STM32F1 and configured all necessary settings for both channels CH2N and CH2.

Using libopencm3-examples lcd-serial as the base so that I could print the results to the onboard screen. Quickest way I could think to get the results since I don't know how to get to the serial console off the top of my head.

STM32, libopencm: https://github.com/libopencm3/libopencm3-examples

eg. see examples for stm32f4 discovery board, as an example, https://github.com/libopencm3/libopencm3-examples/tree/master/examples/stm32/f4/stm32f4-discovery

You just need a startup file, a linker script, a Makefile and an ARM toolchain. There are templates provided by https://stm32-base.org/

See this for an example: https://github.com/STM32-base/STM32-base/blob/master/startup/startup_common.s