Epson S1D13705 technical manual Advanced HAL Functions, Int seSetHighPerformanceBOOL OnOff

Epson Research and Development	Page 55
Vancouver Design Center

int seSetHighPerformance(BOOL OnOff)

Description: This function call enables or disable the high performance bit of the S1D13705.

When high performance is enabled then MClk equals PClk for all video display resolutions. In the high performance state CPU to video memory performance is improved at the cost of higher power consumption.

When high performance is disabled then MClk ranges from PClk/1 at 8 bit-per-pixel to PClk/8 at 1 bit-per-pixel. Without high performance CPU to video memory speeds are slower and the S1D13705 uses less power.

Parameters: OnOff	- a boolean value (defined in HAL.H) to indicate whether to
	enable of disable high performance.
Return Value: ERR_OK	- operation completed with no problems

9.4.3 Advanced HAL Functions

Advanced HAL functions include the functions to support split, virtual and rotated displays. While the concept for using these features is advanced the HAL makes actually using them easy.

int seSetPortraitMethod( int Style )

Description: This selects the portrait mode method to be used when seSetHWRotate() is called to put the S1D13705 into portrait mode.

Parameters: Style	- call with style set to DEFAULT (-1) to select Default Portrait Mode
	- call with style set to any other value to select Alternate Portrait Mode.

Return Value: ERR_OK - operation completed with no problems

ERR_FAILED - the operation failed.

int seSetHWRotate(int Rotate)

Description: This function sets the rotation scheme according to the value of 'Rotate'. When portrait mode is selected as the display rotation the scheme selected is the 'non-X2' scheme.

Parameters: Rotate	- the direction to rotate the display
	- Valid arguments for Rotate are: LANDSCAPE and PORTRAIT.

Return Value: ERR_OK - operation completed with no problems ERR_FAILED - the operation failed to complete.

The most likely reason for failing to set a rotate mode is an inability to set the desired frame rate when setting portrait mode. Other factors which can cause a failure include having a 0 Hz frame rate or specifying a value other than LANDSCAPE or PORTRAIT for the rotation scheme.

Programming Notes and Examples	S1D13705
Issue Date: 02/01/22	X27A-G-002-03