Git Repo for the Hello world samples

Samples Content

01_pio_mbed_BlinkLed : using mbed from PlatformIO
02_pio_arduino_BlinkLed : using Arduino from PlatformIO
03_pio_mbed_Pwm : pwm signal on pin PB_4 with 20 ms period
04_pio_mbed_uart : 2 UARTS Serial3 for log and Serial2 with uart callback echo character
05_pio_mbed_nRF : Not finished, mbed libraries from within platformIO was a bit confusing
06_mbed_cli_Hello_BluePill : Switching to the mbed command line (using version 2 here)
07_mbed_cli_os_Hello_BluePill : switch to the os which is version 5
08_mbed_cli_os_BluePill_Target : adapted the mbed-os to compile for the Bluepill target
09_mbed_cli_nRF : STM32 with the #Home Smart Mesh RF configuration
10_hello_servomotor : simple servo motor examples
11_servo_uart_control : UART interface to control a servo motor from a Raspberry Pi using a Playstation 4 Joystick, the Raps code is here. Note that the PWM is 16 bits and the Joystick refresh rate is 10 ms for a 20 ms servo period, so the control cannot be more fluent.

Below we can see the binary command going out of the Raspberry pi, the anylzer is beeing smart here changing the values randomly to characters or ascii code depending on his wish.
The STM32 with its 72MHz handles an UART callback in 21 us. 4x times faster than one character duration. The last interrupt contains the printf which is in text so takes much longer ~ 1.5 ms.
Still 8.5 ms are free in the 10 ms period in which the Raspberry pi is sending new servo position commands.
Every 10 ms the rasp polls the joystick and if there is an update, sends a new servo command.