St7920 code example serial#
St7920 code example driver#
St7920 code example software#

If the screen displaying text, the Р В Р вЂ Р В РІР‚С™Р РЋРЎв„ўframeР В Р вЂ Р В РІР‚С™Р РЋРЎС™ rate could vary substantially depending on the font sizeР В РІР‚СњР В РІР‚С›nd how much of the screen is actually being written to or updatedР В РІР‚СњР В РІР‚С›nd whether the display is being fully erased between Р В Р вЂ Р В РІР‚С™Р РЋРЎв„ўframesР В Р вЂ Р В РІР‚С™Р РЋРЎС™. Going to be much faster than actually drawing/setting each individual pixel. The time to render and draw a Р В Р вЂ Р В РІР‚С™Р РЋРЎв„ўframeР В Р вЂ Р В РІР‚С™Р РЋРЎС™ can very substantially depending on what is being done per Р В Р вЂ Р В РІР‚С™Р РЋРЎв„ўframeР В Р вЂ Р В РІР‚С™Р РЋРЎС™.Р В РІР‚СњР В РІР‚РЋor example doing a clear screen by writing 8 pixels at a time by writing out contiguous bytes to the glcd pages is I see references to Р В Р вЂ Р В РІР‚С™Р РЋРЎв„ўFrames per secondР В Р вЂ Р В РІР‚С™Р РЋРЎС™, IР В Р вЂ Р В РІР‚С™Р Р†РІР‚С›РЎС›m very curious what that means to people when theyР В РІР‚СњР В РІР‚С›re quoting them for the speeds of their library routines. This is more for thought than to kick of additional discussion in this thread) (This probably should be another thread, and I donР В Р вЂ Р В РІР‚С™Р Р†РІР‚С›РЎС›t want to derail this thread.

(the hw-text-mode of the display is only 16x4 chars) i donР В Р вЂ Р В РІР‚С™Р Р†РІР‚С›РЎС›t have to move sprites or something like that but displaying an entire textpage takes (as i said before) almost 1sec and that is to long for my usecase. since i only found displays up to 4 lines i ended up purchasing a lcd that is able to display graphics and is large enough so that i can create my own font and do the text output by myself. I have not considered direct SPI as I see no circumstance where read operations wonР В Р вЂ Р В РІР‚С™Р Р†РІР‚С›РЎС›t benefit, as the Arduino does not have enough ram for a screen buffer.

St7920 code example software#

is it because i am using software spi? is the arduino the limiting factor in terms of speed? can i increase the data-rate? is it possible to use hw spi with this display? in which circumstances do i have to read from the lcd (reading busyflag?)? i am using shiftOut() for that, clock is pin 3 and data is pin 9. i manipulate pixels there and then copy the entire 1024 byte to the lcd.

right now i am using half of itР В Р вЂ Р В РІР‚С™Р Р†РІР‚С›РЎС›s ram as a screen buffer. Static info and graphs ( status display for some device ) that don't need to be refreshed are perfect candidates for shifting. ( 8x faster than writing whole screen, minus a bit for address changes ) ~40 fps or ~16 fps for 2 objects. Shift registers may suffice if you are only animating like a 32x32 object.

St7920 code example serial#

But this mode can be inserted easily.Р В РІР‚СњР вЂ™Р’В®DIT: what arduino do you have, An uno for example may limit you to serial or shift registers if you need pins for other things, on a mega you have the freedom to choose. I have not considered direct SPI as I see no circumstance where read operations won't benefit, as the Arduino does not have enough ram for a screen buffer.

When I have some testing completed and results to show I'll start a thread for this display. From what I think I understand is, the ST7029 simply reconstructs the serial and 4-bit data into 8-bit mode data anyway. I think a very efficient 8-bit parallel mode could reach similar speeds. The ST7920 serial mode would be the fastest, but only up to a point due to the time the LCD needs to process most commands. In the slowest mode ( writing out via shift registers ) is around 5 - 6 fps for writing to whole screen. It allows Read/Write via parallel, shift registers, spi based shifting.

St7920 code example driver#

I have a multimode driver that I have almost finished. You will need parallel connection for read operations.