Query related to speed
stanzlavos opened this issue · comments
Hi
This post is more of a query and not an "issue". :)
I am driving a 240x320 display with the ILI9341 using a NodeMCU ESP8266. I am trying to display a full screen BMP and measure the time taken.
- ESP8266 running at 160Mhz
- SPI freq at 40000000
- I was using the the library version 1.0.2. But then I saw a commit with the following change :
#if defined (__AVR__) || defined(TEENSYDUINO) || defined (__arm__) || **defined (ESP8266)**
#define USE_FAST_PINIO
#endif
So, I moved to that version.
I had to tweak a lot of code here and there to get it to work.
- Made a small binary to make a HEX dump of the BMP.
- Made an array in PROGMEM using the hex dump.
- Modified a drawBMP sample code I found to use the array instead of reading from SD card.
The time taken to draw the image is around 534ms. Now my question is :
Is it possible to draw any faster ? I did see many "optimized" version online, but could not find one that worked for the ESP8266.
you can optimize more and more but at some point it becomes challenging to support.