General Category > Discussion - EVE
Standby mode
raydem:
Hello,
Question.... When send the command Standby (0x41) the display should turns off?
BRT Community:
Hello,
Thank you for your question, when the device is placed into standby mode the system clock applied to the graphics core is disabled, however the previous screen may persist on the LCD panel. As such we would recommend issuing a blank screen to EVE before issuing any power state host commands to the IC.
--- Code: --- ramDisplayList = RAM_DL; // start of Display List
EVE_MemWrite32(ramDisplayList, 0x02000000); // Clear Color RGB sets the colour to clear screen to
ramDisplayList += 4; // point to next location
EVE_MemWrite32(ramDisplayList, (0x26000000 | 0x00000007)); // Clear 00100110 -------- -------- -----CST (C/S/T define which parameters to clear)
ramDisplayList += 4; // point to next location
EVE_MemWrite32(ramDisplayList, 0x00000000); // DISPLAY command 00000000 00000000 00000000 00000000 (end of display list)
EVE_MemWrite32(REG_DLSWAP, DLSWAP_FRAME); // Swap display list to make the edited one active
--- End code ---
Best Regards,
BRT Community
raydem:
Thank you for the answer.
When send the command 0x41 (Standbye mode) the LCD panel turns off. It is able to back to active only with the command 0x00 (Active), and the LCD panel turns on. Any idea why the display turns off? I need to show the last screen in the LCD panel.
BRT Community:
Hello,
Yes when the graphics core is placed into STANDBY it will not be driving the display pins on the IC, thus it appears as if the display has turned off. Unfortunately if your require the last screen to be persistent on the LCD panel the only way to guarantee this is by keeping EVE in the ACTIVE state.
Best Regards,
BRT Community
raydem:
Thank you, It will be possible to do anything externally with the pinouts to be persistent on the LCD panel? Maybe some pinouts with pull up or something?
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