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KD 23MTS

Microcontroller Platform

This project is a simple oscilloscope built using an STML476RG microcontroller and a 4" TFT SPI 480x320px V2.1 LCD with an integrated ILI9488 driver and touchscreen with an XPT2046 driver. It was developed for the Robot Controllers project during the 6th semester of AiR at PWR.

Project Goals

  • 2 channels
  • FFT (Fast Fourier Transform)
  • RMS, peak-to-peak, and frequency measurements
  • Horizontal and vertical cursors
  • Auto mode trigger (channel 1)

Connections

  • LCD

    STM pin Component pin Signal description
    PA6 SDO(MISO) TFT_MISO
    PC9 LED TFT_Backlight
    PB3 SCK TFT_SCK
    PA7 SDI(MOSI) TFT_MOSI
    PC4 DC/RS TFT_DC/RS
    PA10 RESET TFT_RESET
    PC8 CS TFT_CS
  • Touchscreen

    STM pin Component pin Signal description
    ----- T_IRQ T_IRQ
    PC2 T_DO Touch_MISO
    PC3 T_DIN Touch_MOSI
    PB12 T_CS Touch_CS
    PB10 T_CLK Touch_SCK
  • Rotary encoder

    STM pin Component pin
    PA9 ENC_A
    PA8 ENC_B
    PC0 ENC_BTN
  • Oscilloscope channels

    STM pin Component pin Signal description
    PC5 BNC connector 1 Channel 1
    PB1 BNC connector 2 Channel 2
  • Test signal output

    STM pin Component pin Signal description
    PB0 GEN OUT connector 1kHz test signal

Touchscreen calibration

  1. Navigate to the file oscilloscope.c and locate line 35. Remove the comment slashes (//) to activate the function touchScreenCalibration();. Save the changes and upload the code to the device.
  2. Open a Serial monitor on your PC. You should observe the following prompt:
    Press the screen at the yellow squares that appear,
    then paste the following line into stm32_adafruit_ts.h :
    
  3. Interact with the LCD screen by pressing on the three yellow squares. Upon completion, the calibration values will be displayed. For example:
    #define  TS_CINDEX            {1777297, 4469, -237569, 908499464, -171651, 9601, 587895710}
    
  4. Follow the instructions provided in the previous step by copying and pasting the displayed line into the file stm32_adafruit_ts.h. After pasting, comment out line 35 in oscilloscope.c, and re-upload the modified code to the device.

Used tools:

Used Libraries

  • Touchscreen Library: stm32_hal_graphics_display_drivers - This library was chosen for its effective calibration function and reliable touch detection.
  • LCD Library: ILI9488-DMA-SPI-STM32 - This library was selected for its high display speed. It was modified to use a frame buffer to prevent flickering.

(No need to install any libraries; the appropriate files are included in the project.)

Authors:

Special thanks

Special thanks to Eryk Możdzeń, who helped with programming.