1. Need a 8 bits of data to the SPI bus transmission five us
2. Write coordinates need to send two 16-bit data and three commands, a total of around need 60 us
3. Light a pixel need to coordinate and send color data, need 75 us
4. Draw a 16 * 8 song typeface characters need time is about 10 ms
5. Project to 160 * 80 pixel screen 46 to write 16 * 8 characters, need time to around 460 ms
Now call a sweep screen function in the main loop, will have to spend 460 ms, the great god is there can be a good way to improve the speed of scanning
CodePudding user response:
SPI clock?CodePudding user response:
Open double cache memory area, a save of the current screen images, another piece of deposit to update the image, then compare the two block image content different pixels, in the communications when only send the data in the different regions of memory, according to the past