STM32CubeF4

@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file GPIO/GPIO_IOToggle/readme.txt
* @author MCD Application Team
* @brief Description of the GPIO IO Toggle example.
******************************************************************************
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@endverbatim

@par Example Description

How to configure and use GPIOs through the HAL API.

PC10 IO (configured in output push-pull mode) toggles in a forever loop.

In this example, HCLK is configured at 180 MHz.

@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.

@note The application need to ensure that the SysTick time base is always set to 1 millisecond
to have correct HAL operation.

@note The connection of the LCD reset pin to a dedicated GPIO PK7 instead of the STM32F469 NRST pin may cause residual display on LCD with applications/examples that do not require display.
The LCD clear can be ensured by hardware through the board's power off/power on or by software calling the BSP_LCD_Reset() function.

@par Keywords

System, GPIO, Output, Alternate function, Push-pull, Toggle

@par Directory contents

- GPIO/GPIO_IOToggle/Inc/stm32f4xx_hal_conf.h HAL configuration file
- GPIO/GPIO_IOToggle/Inc/stm32f4xx_it.h Interrupt handlers header file
- GPIO/GPIO_IOToggle/Inc/main.h Header for main.c module
- GPIO/GPIO_IOToggle/Src/stm32f4xx_it.c Interrupt handlers
- GPIO/GPIO_IOToggle/Src/main.c Main program
- GPIO/GPIO_IOToggle/Src/system_stm32f4xx.c STM32F4xx system source file

@par Hardware and Software environment

- This example runs on STM32F469xx/STM32F479xx devices.

- This example has been tested and validated with STMicroelectronics STM32469I-EVAL RevC board and can be
easily tailored to any other supported device and development board.

- STM32469I-EVAL RevC Set-up
- Connect PC10 on eval board connector (pin 55 in CN6) to an oscilloscope.

@par How to use it ?

In order to make the program work, you must do the following :
- Open your preferred toolchain
- Rebuild all files and load your image into target memory
- Run the example