Arduino for STM32

Hello, I haven't played with my BluePill's for the last 6 months. Today I decided to flash some with Roger's booloader, and verify them all (some are fake). STLink, no problems. Then, I opened Arduino IDE (have to renew my VisualMicro licence...), and all STM32 boards were gone ! Verified the Prefer...

spi_rx_dma_disable() does not do it (it kills Rx, and spi_rx_dma_enable() is not enough to restore it. Finally, the simplest (and fastest ?) I could do : void ISR_NSS_1() // RISING { volatile uint8_t* p = SPI_1_Rx_Buffer; // keep pages only : 0x10 0x00 0xBn (0 <= n < 8) if (*p++ != 0x10 || *p++ !=0...

Hi, for my app, I need to discard some SPI frames. As I understand SPI+DMA, all frames have to be the same size, the buffer size depending on the frames size. I have some variable length frames that have to be discarded (they are useless). They are easily recognizable with their first byte, and thay...

Hi, I recently made a OLED emulator, want to make one for the ST7920 LCD (AKA RepRapDiscount Full Graphic Smart Controller), SPI mode. The OLED protocol was very simple (reason why I started with...), the ST7920 is much more complex ! The datasheet is really unclear to me. For now, much of my knowle...

The app progressed a lot, but still unable to code for the Matchbox window manager (very little information, after hours on the web). And being an absolute newbie in Pi coding, I don't even know the "good" keywords. I attempted to subscribe to the RaspBerry forums, but for some reason it f...

For now, it is tiny (128x64), but alive, in a "always on top" X11 window. Run as a daemon, no Title bar, as reactive as the OLED display, popping up and disapearing pressing a button, and zero flickering when over the video viewer. In fact, it is not always on top : if Chromium browser is ...

No Python ! No QT ! And even more : no Qt with Python ! Want to stay as low level as possible, and avoid such a language. I'll have to use it at some point, but no need for now. Stopped using Basic 35 years ago, I will not use Python now : it's even worse. Finally, I started with a "Hello World...

It blit on the frame buffer, bare metal. Output being a HDMI 1024x600 LCD touchscreen. Your answer is definitely NOT off topic ! It is exactly in topic. The little app called xeyes ! I've seen this widget years ago, and didn't remember. Now searching for the XEyes C source : it is EXACTLY what I nee...

Hi, and happy new year ! I am just discovering Linux coding (on RasPi) because I wrote someting that runs on a STM32, and is displayed on a RasPi LCD. Bitmaps are sent by the STM32 to the RasPi over SPI (Roger's Core) in full duplex mode @16MHz (works GREAT !). These bitmaps (70 to 110/second) are b...

Currently experimenting with another approach : I finally had a look under the RaspBerry Pi hood : drawing directly in the frame buffer ("bare metal programming"). It is interesting because the image of the OLED appears as an overlay, over the underlaying desktop, console, or OctoPrint/Oct...