HAL LTDC Functions

Initialization and de-initialization functions

group LTDC_Exported_Functions_Group1

This subsection provides a set of functions allowing to initialize and deinitialize the LTDC peripheral:

  • HAL_LTDC_Init() to initialize the selected HAL LTDC handle and associate an LTDC peripheral instance

  • HAL_LTDC_DeInit() to de-initialize the given HAL LTDC instance by disabling the LTDC and LTDC layers, and resetting the state machine

Functions

hal_status_t HAL_LTDC_Init ( hal_ltdc_handle_t * hltdc , hal_ltdc_t instance )

Initialize the selected HAL LTDC handle and associate a LTDC peripheral instance.

Parameters :
Return values :

  • HAL_INVALID_PARAM – Invalid parameter when hltdc pointer is NULL.

  • HAL_OK – HAL LTDC handle has been correctly initialized.

void HAL_LTDC_DeInit ( hal_ltdc_handle_t * hltdc )

De-initialize the given HAL LTDC instance by disabling all interrupts, disabling the LTDC layers and LTDC display, and resetting the state machine.

Parameters :

hltdc – Pointer to a hal_ltdc_handle_t structure.

Global configuration functions

group LTDC_Exported_Functions_Group2

This subsection provides a set of functions allowing to set and get the global LTDC peripheral configuration:

Functions

hal_status_t HAL_LTDC_SetConfig ( hal_ltdc_handle_t * hltdc , const hal_ltdc_config_t * p_config )

Configure the LTDC according to the user parameters.

Parameters :
Return values :

  • HAL_INVALID_PARAM – Invalid parameter when p_config pointer is NULL

  • HAL_OK – LTDC instance has been correctly configured.

void HAL_LTDC_GetConfig ( const hal_ltdc_handle_t * hltdc , hal_ltdc_config_t * p_config )

Get the LTDC configuration.

Parameters :

LTDC Layer configuration function

group LTDC_Exported_Functions_Group3

This subsection provides the function allowing to set the LTDC layers configuration:

Functions

hal_status_t HAL_LTDC_SetConfigLayer ( hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer , const hal_ltdc_layer_config_t * p_layer_config )

Configure the LTDC layer according to the user parameters.

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure.

  • layer – Layer index. This parameter can be one of the following values: HAL_LTDC_LAYER_1 or HAL_LTDC_LAYER_2.

  • p_layer_config – Pointer to a hal_ltdc_layer_config_t structure that contains the LTDC layer configuration.

Return values :

  • HAL_INVALID_PARAM – Invalid parameter when p_layer_config pointer is NULL

  • HAL_OK – LTDC layer has been correctly configured.

LTDC Start/Stop functions

group LTDC_Exported_Functions_Group4

This subsection provides a set of function allowing to start and stop the LTDC peripheral:

Functions

hal_status_t HAL_LTDC_Start ( hal_ltdc_handle_t * hltdc , uint32_t interrupts )

Start the LTDC.

Parameters :

  • hltdc – LTDC handle

  • interrupts – Specify the LTDC interrupt sources to be enabled while starting. This parameter can be

    • HAL_LTDC_IT_NONE : Neither FIFO Underrun Interrupt nor Transfer Error interrupt to be enabled Or any combination of the following values:

    • HAL_LTDC_IT_FIFO_UNDERRUN : FIFO Underrun Interrupt

    • HAL_LTDC_IT_TRANSFER_ERROR: Transfer Error interrupt

Return values :

HAL_OK – LTDC started.

hal_status_t HAL_LTDC_Stop ( hal_ltdc_handle_t * hltdc )

Stop the LTDC.

Parameters :

hltdc – LTDC handle

Return values :

HAL_OK – LTDC stopped.

IRQHandler and Callbacks functions

group LTDC_Exported_Functions_Group5

This subsection provides the IRQ handler APIs allowing to handle LTDC interruptions, and Register user Callbacks APIs.

Functions

void HAL_LTDC_IRQHandler ( hal_ltdc_handle_t * hltdc )

Handle the LTDC interrupt request.

Parameters :

hltdc – Pointer to LTDC handle.

void HAL_LTDC_ERR_IRQHandler ( hal_ltdc_handle_t * hltdc )

handle LTDC transfer error and FIFO underrun interrupts.

Parameters :

hltdc – Pointer to LTDC handle.

void HAL_LTDC_LineDetectionIRQHandler ( hal_ltdc_handle_t * hltdc )

handle LTDC line detection interrupt.

Parameters :

hltdc – Pointer to LTDC handle.

void HAL_LTDC_ReloadEventIRQHandler ( hal_ltdc_handle_t * hltdc )

handle LTDC register reload interrupt.

Parameters :

hltdc – Pointer to LTDC handle.

void HAL_LTDC_ErrorCallback ( hal_ltdc_handle_t * hltdc )

Error callback.

Parameters :

hltdc – Pointer to LTDC handle.

void HAL_LTDC_LineDetectionCallback ( hal_ltdc_handle_t * hltdc )

Line detection callback.

Parameters :

hltdc – Pointer to LTDC handle.

void HAL_LTDC_ReloadEventCallback ( hal_ltdc_handle_t * hltdc )

Reload event callback.

Parameters :

hltdc – Pointer to LTDC handle.

hal_status_t HAL_LTDC_RegisterErrorCallback ( hal_ltdc_handle_t * hltdc , hal_ltdc_cb_t p_callback )

Register the LTDC Error callback.

Parameters :

  • hltdc – Pointer to LTDC handle

  • p_callback – Specifies the error callback

Return values :

  • HAL_INVALID_PARAM – Invalid parameter return when p_callback pointer is NULL

  • HAL_OK – LTDC error callback is successfully registered

hal_status_t HAL_LTDC_RegisterLineDetectionCallback ( hal_ltdc_handle_t * hltdc , hal_ltdc_cb_t p_callback )

Register the LTDC Line Detection callback.

Parameters :

  • hltdc – Pointer to LTDC handle

  • p_callback – Specifies the Line Detection callback

Return values :

  • HAL_INVALID_PARAM – Invalid parameter return when p_callback pointer is NULL

  • HAL_OK – LTDC Line Detection callback is successfully registered

hal_status_t HAL_LTDC_RegisterReloadEventCallback ( hal_ltdc_handle_t * hltdc , hal_ltdc_cb_t p_callback )

Register the LTDC Reload Event callback.

Parameters :

  • hltdc – Pointer to LTDC handle

  • p_callback – Specifies the reload event callback

Return values :

  • HAL_INVALID_PARAM – Invalid parameter return when p_callback pointer is NULL

  • HAL_OK – LTDC reload event callback is successfully registered

Peripheral State, Error functions

group LTDC_Exported_Functions_Group6

This subsection provides a set of functions allowing to retrieve peripheral state and last process errors.

Functions

hal_ltdc_state_t HAL_LTDC_GetState ( const hal_ltdc_handle_t * hltdc )

Get the LTDC current state.

Parameters :

hltdc – Pointer to LTDC handle

Return values :

hal_ltdc_state_t – LTDC state, can be one of hal_ltdc_state_t enumeration values

hal_ltdc_layer_state_t HAL_LTDC_GetLayerState ( const hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer )

Get the LTDC layer state.

Parameters :

  • hltdc – Pointer to LTDC handle

  • layer – LTDC layer index, can be one of hal_ltdc_layer_t enumeration values

Return values :

hal_ltdc_layer_state_t – LTDC layer_i state, can be one of hal_ltdc_layer_state_t enumeration values

uint32_t HAL_LTDC_GetLastErrorCodes ( const hal_ltdc_handle_t * hltdc )

Get last error codes.

Parameters :

hltdc – Pointer to LTDC handle

Return values :

Last – error codes

Optional LTDC functions

group LTDC_Exported_Functions_Group7

This subsection provides a set of optional feature management APIs.

Functions

hal_status_t HAL_LTDC_SetBackgroundColor ( const hal_ltdc_handle_t * hltdc , uint32_t rgb888_color )

Set the background color.

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure

  • rgb888_color – RGB888 color, This parameter must be a value between Min_Data = 0x00000000 and Max_Data = 0x00FFFFFF.

Return values :

HAL_OK – Background color configured.

hal_status_t HAL_LTDC_EnableLineDetection ( const hal_ltdc_handle_t * hltdc , uint32_t line )

Set and enable the line detection.

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure

  • line – Line number, This parameter must be a value between Min_Data = 0x000 and Max_Data = 0x7FF.

Return values :

HAL_OK – Line detection enabled.

hal_status_t HAL_LTDC_DisableLineDetection ( const hal_ltdc_handle_t * hltdc )

Disable the line detection.

Parameters :

hltdc – Pointer to a hal_ltdc_handle_t structure

Return values :

HAL_OK – Line detection disabled.

hal_status_t HAL_LTDC_EnableDither ( const hal_ltdc_handle_t * hltdc )

Enable the dither.

Parameters :

hltdc – Pointer to a hal_ltdc_handle_t structure

Return values :

HAL_OK – Dither enabled.

hal_status_t HAL_LTDC_DisableDither ( const hal_ltdc_handle_t * hltdc )

Disable the dither.

Parameters :

hltdc – Pointer to a hal_ltdc_handle_t structure

Return values :

HAL_OK – Dither disabled.

hal_ltdc_color_dither_status_t HAL_LTDC_IsEnabledDither ( const hal_ltdc_handle_t * hltdc )

Check if the dither is enabled or disabled.

Parameters :

hltdc – Pointer to a hal_ltdc_handle_t structure

Return values :

  • HAL_LTDC_COLOR_DITHER_DISABLED – Dither disabled

  • HAL_LTDC_COLOR_DITHER_ENABLED – Dither enabled

Optional LTDC layer functions

group LTDC_Exported_Functions_Group8

This subsection provides a set of optional LTDC layer feature management APIs.

Functions

hal_status_t HAL_LTDC_SetLayerWindowSize ( hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer , uint32_t x_size , uint32_t y_size )

Set the layer window size.

Warning

This API is meant to be used individually, in case you want to configure more then one feature, you must use the HAL_LTDC_SetConfigLayer() .

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure

  • layer – Layer index, This parameter can be one of the following values: HAL_LTDC_LAYER_1 or HAL_LTDC_LAYER_2

  • x_size – Window horizontal size, This parameter must be a value between Min_Data = 0x000 and Max_Data = 0xFFF.

  • y_size – Window vertical size, This parameter must be a value between Min_Data = 0x000 and Max_Data = 0x7FF.

Return values :

HAL_OK – Layer window size configured.

hal_status_t HAL_LTDC_SetLayerWindowPosition ( hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer , uint32_t x0 , uint32_t y0 )

Set the layer window position.

Warning

This API is meant to be used individually, in case you want to configure more then one feature, you must use the HAL_LTDC_SetConfigLayer() .

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure

  • layer – Layer index, This parameter can be one of the following values: HAL_LTDC_LAYER_1 or HAL_LTDC_LAYER_2

  • x0 – Window horizontal start position, This parameter must be a value between Min_Data = 0x000 and Max_Data = 0xFFF.

  • y0 – Window vertical start position, This parameter must be a value between Min_Data = 0x000 and Max_Data = 0x7FF.

Return values :

HAL_OK – Layer window position configured.

hal_status_t HAL_LTDC_SetLayerAddress ( hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer , uint32_t address )

Set the layer address.

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure

  • layer – Layer index, This parameter can be one of the following values: HAL_LTDC_LAYER_1 or HAL_LTDC_LAYER_2

  • address – Frame buffer address

Return values :

HAL_OK – Layer address configured.

hal_status_t HAL_LTDC_SetLayerFrameBuffer ( hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer , const hal_ltdc_frame_buffer_t * p_frame_buffer )

Set a new layer frame buffer.

Warning

This API is meant to be used individually, in case you want to configure more then one feature, you must use the HAL_LTDC_SetConfigLayer() .

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure

  • layer – Layer index, This parameter can be one of the following values: HAL_LTDC_LAYER_1 or HAL_LTDC_LAYER_2

  • p_frame_buffer – Pointer to frame buffer structure definition

Return values :

HAL_OK – Layer frame buffer configured.

hal_status_t HAL_LTDC_SetLayerPitch ( hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer , uint32_t pitch_byte )

Set the layer pitch value for specific cases where the width us larger than expected to be displayed on screen.

Warning

In case of configuring the layer using HAL_LTDC_SetConfigLayer() or HAL_LTDC_SetConfigLayerFlexARGB() or HAL_LTDC_SetConfigLayerFlexYUVCoplanar(), or changing the layer’s frame buffer using HAL_LTDC_SetLayerFrameBuffer() or HAL_LTDC_SetLayerFlexARGBFrameBuffer() or HAL_LTDC_SetLayerFlexYUVCoplanarFrameBuffer() this function have to be recalled.

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure

  • layer – Layer index, This parameter can be one of the following values: HAL_LTDC_LAYER_1 or HAL_LTDC_LAYER_2

  • pitch – New pitch value.

Return values :

HAL_OK – Layer alpha configured.

hal_status_t HAL_LTDC_SetLayerAlpha ( hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer , uint8_t alpha )

Set the layer alpha.

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure

  • layer – Layer index, This parameter can be one of the following values: HAL_LTDC_LAYER_1 or HAL_LTDC_LAYER_2

  • alpha – Alpha value, This parameter must be a value between Min_Data = 0x00 and Max_Data = 0xFF.

Return values :

HAL_OK – Layer alpha configured.

hal_status_t HAL_LTDC_SetLayerBackgroundColor ( hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer , uint32_t color )

Set the layer background color.

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure

  • layer – Layer index, This parameter can be one of the following values: HAL_LTDC_LAYER_1 or HAL_LTDC_LAYER_2

  • color – Background color. This parameter must be a value between Min_Data = 0x000000 and Max_Data = 0xFFFFFF.

Return values :

HAL_OK – Layer background color configured.

hal_status_t HAL_LTDC_SetConfigLayerColorKeying ( hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer , uint32_t rgb888_color )

Set the layer color keying.

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure

  • layer – Layer index, This parameter can be one of the following values: HAL_LTDC_LAYER_1 or HAL_LTDC_LAYER_2

  • rgb888_color – RGB888 Color, This parameter must be a value between Min_Data = 0x00000000 and Max_Data = 0x00FFFFFF.

Return values :

HAL_OK – Layer color keying configured.

hal_status_t HAL_LTDC_EnableLayerColorKeying ( hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer )

Enable the layer color keying.

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure

  • layer – Layer index, This parameter can be one of the following values: HAL_LTDC_LAYER_1 or HAL_LTDC_LAYER_2

Return values :

HAL_OK – Layer color keying enabled.

hal_status_t HAL_LTDC_DisableLayerColorKeying ( hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer )

Disable the layer color keying.

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure

  • layer – Layer index, This parameter can be one of the following values: HAL_LTDC_LAYER_1 or HAL_LTDC_LAYER_2

Return values :

HAL_OK – Layer color keying disabled.

hal_ltdc_color_keying_status_t HAL_LTDC_IsEnabledLayerColorKeying ( const hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer )

Check if the layer color keying is enabled or disabled.

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure

  • layer – Layer index, This parameter can be one of the following values: HAL_LTDC_LAYER_1 or HAL_LTDC_LAYER_2

Return values :

  • HAL_LTDC_COLOR_KEYING_DISABLED – Color keying disabled

  • HAL_LTDC_COLOR_KEYING_ENABLED – Color keying enabled

hal_status_t HAL_LTDC_SetConfigLayerCLUT ( hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer , const uint32_t * p_clut , uint32_t clut_size_pixel )

Configure the LTDC layer CLUT according to the user parameters.

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure.

  • layer – Layer index. This parameter can be one of the following values: HAL_LTDC_LAYER_1 or HAL_LTDC_LAYER_2.

  • p_clut – Pointer to a p_clut source address.

  • clut_size_pixel – CLUT size in pixel.

Return values :

  • HAL_INVALID_PARAM – Invalid parameter when p_clut pointer is NULL

  • HAL_OK – LTDC layer CLUT has been correctly configured.

hal_status_t HAL_LTDC_EnableLayerCLUT ( hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer )

Enable the LTDC layer CLUT.

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure.

  • layer – Layer index. This parameter can be one of the following values: HAL_LTDC_LAYER_1 or HAL_LTDC_LAYER_2.

Return values :

HAL_OK – LTDC layer CLUT enabled.

hal_status_t HAL_LTDC_DisableLayerCLUT ( hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer )

Disable the LTDC layer CLUT.

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure.

  • layer – Layer index. This parameter can be one of the following values: HAL_LTDC_LAYER_1 or HAL_LTDC_LAYER_2.

Return values :

HAL_OK – LTDC layer CLUT disabled.

hal_status_t HAL_LTDC_ForceReload ( const hal_ltdc_handle_t * hltdc , hal_ltdc_reload_type_t reload_type )

Reload LTDC Layers configuration.

Parameters :

  • hltdc – Pointer to a hal_ltdc_handle_t structure.

  • reload_type – This parameter can be one of the following values : HAL_LTDC_RELOAD_IMMEDIATE : Immediate Reload HAL_LTDC_RELOAD_VERTICAL_BLANKING : Reload in the next Vertical Blanking

Return values :

HAL_OK – Configuration reloaded.

User data functions

group LTDC_Exported_Functions_Group9

This subsection provides functions allowing to:

Functions

void HAL_LTDC_SetUserData ( hal_ltdc_handle_t * hltdc , const void * p_user_data )

Store the user data into the LTDC handle.

Parameters :

  • hltdc – Pointer to LTDC handle

  • p_user_data – Pointer to the user data

const void * HAL_LTDC_GetUserData ( const hal_ltdc_handle_t * hltdc )

Retrieve the user data from the LTDC handle.

Parameters :

hltdc – Pointer to LTDC handle

Return values :

Pointer – to the user data

LTDC retrieve clock frequency

group LTDC_Exported_Functions_Group10

This subsection provides the function allowing to retrieve the LTDC clock frequency:

Functions

uint32_t HAL_LTDC_GetClockFreq ( const hal_ltdc_handle_t * hltdc )

Return the peripheral clock frequency for LTDC.

Parameters :

hltdc – Pointer to LTDC handle

Return values :

  • uint32_t – Frequency in Hz

  • 0 – Source clock of the LTDC not configured or not ready

Enable/Disable and interrupt functions

group LTDC_Exported_Functions_Group11

This subsection provides unitary functions allowing to:

Functions

void HAL_LTDC_Enable ( hal_ltdc_handle_t * hltdc )

Enable the LTDC.

Parameters :

hltdc – LTDC handle

void HAL_LTDC_Disable ( hal_ltdc_handle_t * hltdc )

Disable the LTDC.

Parameters :

hltdc – LTDC handle

void HAL_LTDC_EnableLayer ( const hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer )

Enable the LTDC Layer.

Parameters :

  • hltdc – LTDC handle

  • layer – Specify the layer to be enabled.

void HAL_LTDC_DisableLayer ( const hal_ltdc_handle_t * hltdc , hal_ltdc_layer_t layer )

Disable the LTDC Layer.

Parameters :

  • hltdc – LTDC handle

  • layer – Specify the layer to be disabled.

uint32_t HAL_LTDC_IsActiveFlag ( const hal_ltdc_handle_t * hltdc , uint32_t flag )

Get the LTDC pending flags.

Parameters :

  • hltdc – LTDC handle

  • flag – Get the specified flag. This parameter can be any combination of the following values:

    • HAL_LTDC_FLAG_LINE_INTERRUPT: Line Interrupt Flag

    • HAL_LTDC_FLAG_FIFO_UNDERRUN : FIFO Underrun Interrupt Flag

    • HAL_LTDC_FLAG_TRANSFER_ERROR: Transfer Error interrupt Flag

    • HAL_LTDC_FLAG_RELOAD : Register Reload Interrupt Flag

Return values :

1 – when the flag is SET, 0 when the flag is RESET.

void HAL_LTDC_ClearFlag ( hal_ltdc_handle_t * hltdc , uint32_t flag )

Clears the LTDC pending flags.

Parameters :

  • hltdc – LTDC handle

  • flag – Specify the flag to clear. This parameter can be any combination of the following values:

    • HAL_LTDC_FLAG_LINE_INTERRUPT: Line Interrupt Flag

    • HAL_LTDC_FLAG_FIFO_UNDERRUN : FIFO Underrun Interrupt Flag

    • HAL_LTDC_FLAG_TRANSFER_ERROR: Transfer Error interrupt Flag

    • HAL_LTDC_FLAG_RELOAD : Register Reload Interrupt Flag

void HAL_LTDC_EnableIT ( hal_ltdc_handle_t * hltdc , uint32_t interrupt )

Enables the specified LTDC interrupts.

Parameters :

  • hltdc – LTDC handle

  • interrupt – Specify the LTDC interrupt sources to be enabled. This parameter can be any combination of the following values:

    • HAL_LTDC_IT_LINE_INTERRUPT: Line Interrupt Flag

    • HAL_LTDC_IT_FIFO_UNDERRUN : FIFO Underrun Interrupt Flag

    • HAL_LTDC_IT_TRANSFER_ERROR: Transfer Error interrupt Flag

    • HAL_LTDC_IT_RELOAD : Register Reload Interrupt Flag

void HAL_LTDC_DisableIT ( hal_ltdc_handle_t * hltdc , uint32_t interrupt )

Disables the specified LTDC interrupts.

Parameters :

  • hltdc – LTDC handle

  • interrupt – Specify the LTDC interrupt sources to be disabled. This parameter can be any combination of the following values:

    • HAL_LTDC_IT_LINE_INTERRUPT: Line Interrupt Flag

    • HAL_LTDC_IT_FIFO_UNDERRUN : FIFO Underrun Interrupt Flag

    • HAL_LTDC_IT_TRANSFER_ERROR: Transfer Error interrupt Flag

    • HAL_LTDC_IT_RELOAD : Register Reload Interrupt Flag

uint32_t HAL_LTDC_IsEnabledIT ( const hal_ltdc_handle_t * hltdc , uint32_t interrupt )

Check whether the specified LTDC interrupt is enabled or not.

Parameters :

  • hltdc – LTDC handle

  • interrupt – Specify the LTDC interrupt source to check. This parameter can be one of the following values:

    • HAL_LTDC_IT_LINE_INTERRUPT: Line Interrupt Flag

    • HAL_LTDC_IT_FIFO_UNDERRUN : FIFO Underrun Interrupt Flag

    • HAL_LTDC_IT_TRANSFER_ERROR: Transfer Error interrupt Flag

    • HAL_LTDC_IT_RELOAD : Register Reload Interrupt Flag

Return values :

1 – when the interrupt is enabled, 0 when the interrupt is desabled