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TFT LCD ST7789H2

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  1. HI sir, My self-Mahesh firmware engineer at datashrubs solutions Currently I am working with 1.54 inch display module(st7789h2),This module is configured with four wire SPI. I am facing some issues 1, Pixel writing is very slow. 2, Not able to control the brightness. 3, I am able to write only full image(240*240) Pixel writing is very slow: I am able to display the test and image, however writing speed is very slow ,to write full image (240 *240) pixel its taking around 4min. we tried to change frame rate value (00 to FF )in C6h register ,still pixel writing speed remains same. Please find the attached video file you can see the how the pixel writing. Kindly let me know how to increase the pixel speed. Not able to control the brightness: We are setting the BCTRL bit to enable the brightness control blank in 53h register, Display control register (51h) DBV0-7 value we tried to change it from min to max ,however brightness remains same. Any other register need to be set. I am able to write only full image(240*240): To get bitmapping image data(16bit) I am using LCD image converter tool. When we tried to write full image( 240*240) its displaying properly, but when we tried to write 100 *100 Pixel it’s not displaying as expected.
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