can fixes are compile tested only. I don't have those boards. f3 i2c is tested on i2c and gives the same results l1 low power demo seems to have been broken for some time already. => should be fixed, but not something I'm going to work on right now.
README
UART TX on PA2 @ 115200/8n1
This example reads the onboard accelerometer and dumps the raw value of the ACC_OUT_X_L_A/ACC_OUT_X_H_A registers. (you should see ~0 for flat, and positive/negative values for tipping the board along it's long axis, ranging up to plus/minus 16k or so for vertical.