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SHARP Memory Display Breakout - 2.7" 400x240 with nrf52840

Muhammad

Hi,

I want to use SHARP Memory Display Breakout - 2.7" 400x240 with nrf52840 development kit. I have to interface the lvgl library for the graphics development but from the documentation, I could not figure out how to connect and there is no basic code for interfacing with the nordic SDK. Please suggest any type of reference for examples if available.

Any kind of input or help will be appreciated.

Thanks in Advance,

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  • 0
    Muhammad said:
    Can you guide how I can find which pins are configured for the spi in a specific project?

    After building your project, in the nRF Connect tab, you may expand GPIO to the left in VS Code. However, using the code I uploaded, I was not able to see all pins shown in use as expected. I am assuming this has to do with some of the pins configured using the new Pin control functionality and some pins defined the classic way. I will look into this and get back to you.

  • 0 in reply to helsing

    Hi,

    Thanks for the reply. I have tried with the latest nrfConnect SDK and the following is the error when I open the sample application from the nrfConnect SDK and not a single change. It seems the sample is not compiling fine here.

  • 0 in reply to Muhammad

    Thank you for uploading.

    I spotted some other mistakes in the initial suggested pins. (I apologize for the mistake. Please note that the initial suggestions were only meant as a mock up example, demonstrating syntax and how to select pins and making use of Pin control.)

    For example, the following code from the overlay translates to P1.12(not P0.16 as I wrote by mistake):
    cs-gpios = <&arduino_header 16 GPIO_ACTIVE_HIGH>;

    Here is the corrected table:

    Display module pin name nRF52840 pin name Arduino header Comment
    EXTIN P1.04 D3 (Old pin: P0.14)
    DISP P1.05 D4 (Old pin: P0.12)
    EXTMD 'GND' or 'VDD' I assume this is for toggling display inversion.

    CS

    		 P1.12 D10 (Old pin: P0.16)

    MOSI

    		 P1.13 D11 Recommend to use P1.13 or another pin as P0.13 may interfere with the LEDs.
    SCLK P1.15 D13 Recommend to use P1.15 or another pin as P0.15 may interfere with the LEDs.
    GND 'GND'
    3V3 'Vin 3-5V' The DK adjusts the IO voltage according to the voltage provided at the 'Vin 3-5V' pin
    VIN (3.3V-5V) '5V' The DK now supplies the display module with 5V
    P1.14 (MISO) D12 MISO not used by display module. Recommended to use P1.14 or another pin as P1.14 may interfere with the LEDs.

    The pins are updated according to the Arduino header definitions in the board files( nrf52840_nrf52840.dts):

    	arduino_header: connector {
		compatible = "arduino-header-r3";
		#gpio-cells = <2>;
		gpio-map-mask = <0xffffffff 0xffffffc0>;
		gpio-map-pass-thru = <0 0x3f>;
		gpio-map = <0 0 &gpio0 3 0>,	/* A0 */
			   <1 0 &gpio0 4 0>,	/* A1 */
			   <2 0 &gpio0 28 0>,	/* A2 */
			   <3 0 &gpio0 29 0>,	/* A3 */
			   <4 0 &gpio0 30 0>,	/* A4 */
			   <5 0 &gpio0 31 0>,	/* A5 */
			   <6 0 &gpio1 1 0>,	/* D0 */
			   <7 0 &gpio1 2 0>,	/* D1 */
			   <8 0 &gpio1 3 0>,	/* D2 */
			   <9 0 &gpio1 4 0>,	/* D3 */
			   <10 0 &gpio1 5 0>,	/* D4 */
			   <11 0 &gpio1 6 0>,	/* D5 */
			   <12 0 &gpio1 7 0>,	/* D6 */
			   <13 0 &gpio1 8 0>,	/* D7 */
			   <14 0 &gpio1 10 0>,	/* D8 */
			   <15 0 &gpio1 11 0>,	/* D9 */
			   <16 0 &gpio1 12 0>,	/* D10 */
			   <17 0 &gpio1 13 0>,	/* D11 */
			   <18 0 &gpio1 14 0>,	/* D12 */
			   <19 0 &gpio1 15 0>,	/* D13 */
			   <20 0 &gpio0 26 0>,	/* D14 */
			   <21 0 &gpio0 27 0>;	/* D15 */
	};

  • 0 in reply to helsing

    Hi,

    Thanks for the reply. I have tried as you said above and tried after verification as well multiple times. But the results are the same as there is no display on the screen. Do you know what could be the reason?


    Also, currently, I am connecting Vin of lcd with DK 5v pin and v3.3 with VDD of DK. Do you think we need to provide the lcd a separate voltage source? if yes on which pin?

  • 0 in reply to Muhammad

    What is the voltage operating range specification of the display? What is the recommended operating voltage, and what is the IO voltage levels of the display?

    Muhammad said:
    Also, currently, I am connecting Vin of lcd with DK 5v pin and v3.3 with VDD of DK.

    If the LCD is powered with 5V, you might need to power the DK with a higher voltage as well, in order for the IO signals to match.

    The nRF52840 DK can be configured for 5V mode using the nRF power source switch on the DK. Set the switch to 'USB'.

    More details about this switch in the DK user guide.

    Muhammad said:
    But the results are the same as there is no display on the screen. Do you know what could be the reason?

    Are you still seeing '52', like the image below, or is the screen completely blank? Is the screen dark or bright? Does it change when you power it?

    Do you have access to any logic analyzer or oscilloscope? If so, you could check whether there is activity on the pins as expected.

  • 0 in reply to helsing

    Hi,

    After you have send me the updated pin configurations I can not now see the 52 on screen instead there are black lines on screen. I also have tried to give the 5V power to the screen but there were no results.

  • 0 in reply to Muhammad

    Is there any output to the terminal? The terminal could be outputting logs and error codes from the application.

    Did you check the pins to see whether there is any activity?

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