Hi there,
around 4 years ago I started experimenting with the bluepill and some 4.2 inch epaper displays. Everything was fine and dandy so I decided to design my own circuit.
Well long story short I postponed the project up until today, I soldered my stuff, programmed the stm32 and connected the module.
Result: nothing.
I probed the board and either with the module connected or disconnected both busy and rst lines were ~1V, which I think is kinda low.
The project is powered by 3.3V via linear psu.
What am I doing wrong?
Here's the code (I use the arduino ide)
#include <GxEPD2_BW.h> // including both doesn't use more code or ram
#include <GxEPD2_3C.h> // including both doesn't use more code or ram
#include <Fonts/FreeMonoBold24pt7b.h>
#include <Fonts/FreeMonoBold18pt7b.h>
#include <Fonts/FreeMonoBold12pt7b.h>
// select the display class and display driver class in the following file (new style):
#include "GxEPD2_display_selection_new_style.h"
void setup()
{
display.init();
// comment out next line to have no or minimal Adafruit_GFX code
display.setTextColor(GxEPD_BLACK);
display.firstPage();
do
{
display.fillScreen(GxEPD_WHITE);
display.println();
display.println();
display.setFont(&FreeMonoBold18pt7b);
// comment out next line to have no or minimal Adafruit_GFX code
display.print(" CIAO");
display.println("Oggi e` il 18");
//display.print("Hello World!");
}
while (display.nextPage());
}
void loop() {};
this gets uploaded fine.
Attached the schematic for my project. Currently only the RTCC and the stm32 are installed, but I'm not using them (see code), since I wanted just to see whether the display worked.
Thanks for any help.