Convenient, zero-overhead C++ wrapper for the STM32 HAL library routines

• Clone this repository into your project's 3rd-party directory or add it as a git sub-module:

git submodule add 'https://github.com/tomikaa87/stm32-hal-cpp.git' 3rdparty/stm32-hal-cpp

• Add the stm32-hal-cpp/include directory to your project's include search path
• Include the necessary headers, e.g. gpio.hpp for the GPIO API

Please keep in mind this library needs a C++11 compatible compiler.

#include "gpio.hpp"

void gpio_test()
{
    using pin_a0 = gpio::output_pin<gpio::gpio_pin<
            gpio::port::a,
            gpio::pins<0>,
            gpio::output_pp_mode,
            gpio::speed::low,
            gpio::pull::nopull>>;

    pin_a0::init();
    pin_a0::set();
}

In this example, gpio::gpio_pin defines a generic structure for the GPIO pin and gpio::output_pin defines the necessary functions (set(), reset(), toggle() etc.) for controlling the output pin.

#include "gpio.hpp"

void gpio_test()
{
    using test_pins = gpio::output_pin<gpio::gpio_pin<
            gpio::port::b,
            gpio::pins<5, 6, 7, 8>,
            gpio::output_pp_mode,
            gpio::speed::low,
            gpio::pull::nopull>>;

    test_pins::init();
    test_pins::set();
}

In this example we use the same way to define the output pins, but as you can see, we pass multiple pin indices to gpio::pins<>. This way the initialization and all the operations are done in a single step without any overhead. Calling set() will output a logical 1 on all the pins.

void gpio_test()
{
    using input_b4 = gpio::input_pin<gpio::gpio_pin<
            gpio::port::b,
            gpio::pins<4>,
            gpio::input_mode,
            gpio::speed::high,
            gpio::pull::up>>;

    input_b4::init();
    bool high = input_b4::read();
}

In this example we used gpio::input_mode to instruct the API to setup the pin as an input. gpio::pull::up enables the internal pull-up resistor. If we read() the port's value when it's unconnected or connected to VCC, we will get a true value, but if we connect the pin to GND, we will get false.