Pixel display on Sharp Memory LCD with nRF51

[LK13131]

Hi,

I am coding a Sharp memory LCD display using SPI and the nRF51422 development board.

I have tested the SPI connection using a logic analyzer and signals are being sent to clk, chip select and MOSI pins.

However, I cannot get meaningful images to appear on the screen. Only random dots appear on the screen after programming the nRF51 and turning it on and off.

In the attached IAR code, I am trying to write a line of 0's and 1's to line 1 of the 96x96 screen.

The SPI CLK has been tested at 8MHz, 1MHz and 125kHz, but the screen does not function in any of these cases.

IAR full workspace: spi_master.eww

main.c: main.c

Picture of connections between LCD and nRF51422: LCD.jpg

Datasheet for Sharp Memory LCD boosterpack: TI booster pack slau553.pdf

Document for protocols in writing data to LCD: programming_memory_lcd_app_note.pdf

[Hung Bui]

@LK: You may want to capture a logic analyzer trace on the SPI line to see what is actually sent over the interface. In your code I saw that you are sending the command to write a line with 0xa0|(v_bit <<6);, is it correct ? I thought the command to write one line should be 0x80|(v_bit <<6); ?