Need help in buying a display for Teensy 3.6
Posted: Tue Jun 13, 2017 9:21 pm
Hello.
I'm finally going to buy a Teensy 3.6 board. I'm wondering what kind of a display would be good for it.
The display that I need needs to be at least 220x178 and have at least 256 colors. The display shouldn't have any kind of tearing effects or slow upload speed. I'm not sure should I buy an SPI display or a parallel display because I don't know if Teensy has a parallel bus like XMEGA. Does Teensy have a parallel bus DMA? If the display is SPI, what do you think if I use DMA and SPI to blit a framebuffer located on Teensy's RAM onto the display? Is it effective? What kind of a screen has a fast enough SPI to receive a whole frame before the tearing effect occurs? Does anyone have a video with a tech demo showing these requirements?
So far I have ST7775 and NT931-something-I-don't-know and both use 5V for the background LED and 3.3V for power and I/O which confuses me as I cannot supply both 3.3V and 5V from my Arduino. If I use 5V, the screen doesn't work and if I use 3.3V, the backlight is so weak that it's hard to see the picture. Does Teensy have a 5V pin along with the 3.3V I/O?
Please tell me what you think. Thank you!
I'm finally going to buy a Teensy 3.6 board. I'm wondering what kind of a display would be good for it.
The display that I need needs to be at least 220x178 and have at least 256 colors. The display shouldn't have any kind of tearing effects or slow upload speed. I'm not sure should I buy an SPI display or a parallel display because I don't know if Teensy has a parallel bus like XMEGA. Does Teensy have a parallel bus DMA? If the display is SPI, what do you think if I use DMA and SPI to blit a framebuffer located on Teensy's RAM onto the display? Is it effective? What kind of a screen has a fast enough SPI to receive a whole frame before the tearing effect occurs? Does anyone have a video with a tech demo showing these requirements?
So far I have ST7775 and NT931-something-I-don't-know and both use 5V for the background LED and 3.3V for power and I/O which confuses me as I cannot supply both 3.3V and 5V from my Arduino. If I use 5V, the screen doesn't work and if I use 3.3V, the backlight is so weak that it's hard to see the picture. Does Teensy have a 5V pin along with the 3.3V I/O?
Please tell me what you think. Thank you!