How to lower the power consumption of the Sharp BoosterPack display?

[rei-vilo]

I'm trying to lower the power consumption of the Sharp BoosterPack display as much as possible, with the screen maintaining what is displayed and the rest of the CC1352 in low power or idle mode.

• A first idea is to turn the SPI bus off to save power on the CC1352R.

The SPI bus takes about ~2 mA alone.

Doing so freezes the MCU as SendToggleVCOMCommand() tries to use SPI.

Energia/libraries/LCD_SharpBoosterPack_SPI/LCD_SharpBoosterPack_SPI.cpp

Lines 529 to 537 in 3116b84

	digitalWrite(_pinChipSelect, HIGH);
	SPI.transfer((char)command);
	SPI.transfer((char)SHARP_LCD_TRAILER_BYTE);
	// Wait for last byte to be sent, then drop SCS
	delayMicroseconds(10);
	// Set P2.4 High for CS
	digitalWrite(_pinChipSelect, LOW);

So the question is how to maintain the Toggle VCOM procedure without using SPI?

• What other techniques to use to lower power consumption as much as possible?

Could the Sensor Controller come to the rescue?

Note: According to page 16 of LS013B7DH03_16Nov12_Spec_LCP-1112061.pdf, CS is HIGH to select the screen.