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  • skpang's Avatar
    05-19-2020, 07:35 AM
    Hi MichaelMeissner, Is there any simple sketch to test the psram and flash after they been soldered? I've seen the long thread about T4.1 but would nice to have a simple sketch to see they are connected.
    12 replies | 389 view(s)
  • skpang's Avatar
    05-12-2020, 07:03 PM
    Sparkfun have them in stock now. No restriction on how many you can buy. When the Teensy 4.0 was release it was only 2 per customer. Just ordered some.
    783 replies | 26071 view(s)
  • skpang's Avatar
    05-11-2020, 04:24 PM
    Got an email from Sparkfun. Teensy 4.1 should be available from today !! https://www.sparkfun.com/products/16771 Oh its pre-order.
    783 replies | 26071 view(s)
  • skpang's Avatar
    05-10-2020, 10:46 AM
    Nice project. I like the combination of electronics and wood.
    4 replies | 135 view(s)
  • skpang's Avatar
    05-05-2020, 08:59 AM
    The SPI is quite slow. The driver won't go above 22MHz. Check in the file RA8875UserSettings.h about line 190 const static uint32_t MAXSPISPEED = 22000000UL; I'm sure the RA8875 can go above 22MHz but the...
    10 replies | 386 view(s)
  • skpang's Avatar
    05-04-2020, 01:46 PM
    Code is on Github: https://github.com/skpang/Teensy40_LittlevGL_ILI9488_demo_create Ensure the following library are installed first: https://github.com/littlevgl/lv_arduino...
    26 replies | 3534 view(s)
  • skpang's Avatar
    05-03-2020, 08:35 PM
    I've got it working with the Teensy 4.0 and a 3.5" LCD with ILI9488_t3 driver. Managed to get the SPI running at 60MHz. Its fast.
    26 replies | 3534 view(s)
  • skpang's Avatar
    05-03-2020, 09:59 AM
    The Button and Label test code are at: https://github.com/skpang/Teensy40_LittlevGL_RA8875_button Ensure you have installed these library first: https://github.com/mjs513/RA8875/tree/RA8875_t4...
    10 replies | 386 view(s)
  • skpang's Avatar
    04-30-2020, 08:14 PM
    Agree, I had the SPI working at 60MHz connected to an ILI9488 LCD. Its really fast and I'm surprised it works at 60MHz. The LCD is working at 60MHz. I'm thinking do I really need to drive it in 8 bit parallel model ?
    783 replies | 26071 view(s)
  • skpang's Avatar
    04-26-2020, 09:28 AM
    Is there any 8 GPIO pins that is mapped directly to memory so it can be written in one byte on the Teensy 4.1 ? That is if I want to control 8 GPIO at once by writing one byte to memory. There is a special configuration...
    783 replies | 26071 view(s)
  • skpang's Avatar
    04-20-2020, 06:25 PM
    Thank you KurtE for the pinout spreadsheet. How comes there is MISO1 on D1 and another MISO1 on D39 ?
    783 replies | 26071 view(s)
  • skpang's Avatar
    04-15-2020, 02:50 PM
    SOLVED !! I've changed it to use writeRect instead: /* Display flushing */ void my_disp_flush(lv_disp_drv_t *disp, const lv_area_t *area, lv_color_t *color_p) { uint16_t width = (area->x2 - area->x1 +1); ...
    10 replies | 386 view(s)
  • skpang's Avatar
    04-15-2020, 01:18 PM
    Ok, I've deleted the original RA8875 library and install this one: https://github.com/mjs513/RA8875/tree/RA8875_t4 but still the same problem. I think something is not right with drawPixels() or I'm not calling it...
    10 replies | 386 view(s)
  • skpang's Avatar
    04-15-2020, 08:52 AM
    I'm trying to use the LittlevGL library with RA8875 LCD on Teensy 4.0. The LCD is a 800x480 and the RA8875 library is from sumotoy v0.70b11p11 There is no LittlevGL port for the Teensy 4.0 so I've attempted my own...
    10 replies | 386 view(s)
  • skpang's Avatar
    04-11-2020, 09:53 AM
    Hi @prickle I'm try to get LittleVGL to compile for Teensy 4.0 and looking at your example in post #1. The LV_VDB_SIZE_IN_BYTES is not defined. I've made it to 307200. (480x320*16)/8 = 307200 But it still won't...
    26 replies | 3534 view(s)
  • skpang's Avatar
    04-06-2020, 07:20 PM
    Boris is in intensive care now. Hope he pulls through.
    131 replies | 5508 view(s)
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About skpang

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About skpang
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www.skpang.co.uk
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Are there other stores that sell the psram chips? 05-19-2020 07:35 AM
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05-26-2020 08:35 AM
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01-12-2015