Functions
Initialization and De-initialization Functions
Peripheral Driver » HAL Driver » HAL » Functions

Initialization and de-initialization functions. More...

## Functions
hal_status_t | hal_init (void)
| This function configures time base source, NVIC and Low level hardware. More...
hal_status_t | hal_deinit (void)
| This function de-initializes common part of the HAL and stops the source of time base. More...
void | hal_msp_init (void)
| Initialize the MSP. More...
void | hal_msp_deinit (void)
| De-initialize the MSP. More...

## Detailed Description

Initialization and de-initialization functions.

     ===============================================================================
                  ##### Initialization and de-initialization functions #####
     ===============================================================================
        [..]  This section provides functions allowing to:
          (+) Initialize the Flash interface, the NVIC allocation and initial clock
              configuration. It also initializes the source of time base when timeout
              is needed.
          (+) De-initialize common part of the HAL.
          (+) Configure The time base source to have 1ms time base with a dedicated
              Tick interrupt priority.
            (++) SysTick timer is used by default as source of time base, but user can
                 eventually implement his or her proper time base source (a general purpose
                 timer for example or other time source), keeping in mind that Time base
                 duration should be kept as 1ms since PPP_TIMEOUT_VALUEs are defined and
                 handled in milliseconds basis.
            (++) Time base configuration function (hal_init_tick()) is called automatically
                 at the beginning of the program after reset by hal_init().
            (++) Source of time base is configured  to generate interrupts at regular
                 time intervals. Care must be taken if hal_delay() is called from a
                 peripheral ISR process, the Tick interrupt line must have higher priority
                (numerically lower) than the peripheral interrupt. Otherwise the caller
                ISR process will be blocked.
           (++) Functions affecting time base configurations are declared as __Weak
                to make  override possible  in case of other  implementations in user file.

## Function Documentation

## ◆ hal_deinit()

hal_status_t hal_deinit | ( | void |  | ) |

This function de-initializes common part of the HAL and stops the source of time base.

Note
  This function is optional.

Return values

  HAL_OK | Operation is OK.
  HAL_ERROR | Parameter error or operation not supported.
  HAL_BUSY | Driver is busy.
  HAL_TIMEOUT | Timeout occurred.

## ◆ hal_init()

hal_status_t hal_init | ( | void |  | ) |

This function configures time base source, NVIC and Low level hardware.

Note
  This function is called at the beginning of program after reset and before the clock configuration. The SysTick configuration is based on AHB clock. When the time base configuration is done, time base tick starts incrementing. In the default implementation, SysTick is used as source of time base. The tick variable is incremented each 1ms in its ISR.

Return values

  HAL_OK | Operation is OK.
  HAL_ERROR | Parameter error or operation not supported.
  HAL_BUSY | Driver is busy.
  HAL_TIMEOUT | Timeout occurred.

## ◆ hal_msp_deinit()

void hal_msp_deinit | ( | void |  | ) |

De-initialize the MSP.

Note
  This function should not be modified. When the callback is needed, the hal_msp_deinit could be implemented in the user file.

## ◆ hal_msp_init()

void hal_msp_init | ( | void |  | ) |

Initialize the MSP.

Note
  This function should not be modified. When the callback is needed, the hal_msp_init could be implemented in the user file.