Hello,
I am facing the same issue and not able to display the images on to the M5 Paper. I have tried both canvas.drawPngFile(SPIFFS, "/smiley.png", 0, 0);
and canvas.drawJpgFile(SPIFFS, "/smiley.jpg", 0, 0); but no luck.
I already included #include "SPIFFS.h" and initialized SPIFF using M5.begin(true, true, true, true, false);. The png and jpg files are inside the data folder. SPIFFS.open("/smiley.png") is able to open the file however it is not printing any file content on the console.

I think it is required to format the SPIFFS for the first time, as mentioned here so I followed these steps but ESP32 Sketch data upload is not appearing in arduino 2.0.

However I am able to display the png image using canvas.drawPngUrl("http://imageUrl"); but it is taking more time and quite slow.

Could you please help me in understanding what I am doing wrong?
@simonm @felmue

Hello,
I Got the GFX font header file (by converting the Roboto.ttf file). Loaded the font file using canvas.setFreeFont(&Roboto_Medium50pt7b) and then display the text using canvas.printf(textString.c_str());.
It is working fine and display the text properly but when I am giving some special characters äöü then they are not appearing on M5stack paper.
Can someone please guide me what I am doing wrong? Am I missing something?

Thanks

The link to my question can be found here

Hello,
I Got the GFX font header file (by converting the Roboto.ttf file). Loaded the font file using canvas.setFreeFont(&Roboto_Medium50pt7b) and then display the text using canvas.printf(textString.c_str());.
It is working fine and display the text properly but when I am giving some special characters äöü then they are not appearing on M5stack paper.
Can someone please guide me what I am doing wrong? Am I missing something?

Thanks

The link to my question can be found here

Hello,
I Got the GFX font header file (by converting the Roboto.ttf file). Loaded the font file using canvas.setFreeFont(&Roboto_Medium50pt7b) and then display the text using canvas.printf(textString.c_str());.
It is working fine and display the text properly but when I am giving some special characters äöü then they are not appearing on M5stack paper.
Does anyone know what could be the problem? am I missing something?

Thanks

@felmue Hello Felix.
Thank you very much for your help.
I get it working using the hour field with some little changes.

@felmue Hello Felix.
Is it possible to provide me the working code snippet with longer than 4 hours sleep duration?

Or

Can you please check if there is any problem with the code snippet I posted earlier?

Thanks

@felmue Hello Felix.

1. I also already had delay (10) before M5.shutdown();
   Do I2CEnable need to be TRUE in M5 initialization? to use I2C commands?
   I have it False in M5 initialization call M5.begin(true, false, true, true, false);, could this be a problem?
   However, it is working fine if the sleep duration is less than 4 hours

2. M5Paper has 100% battery, I can restart it manually by pressing the side button. The battery is showing as 100%

@felmue I tried longer sleep duration of 9 hours and unfortunately the device didn't wakeup.
Is it possible that M5.RTC.setAlarmIRQ(wakeupDate, wakeupTime); also has a limitaiton of max 4 hours of sleep duration?

@felmue I think 4.35v are somehow coming from the charging cable, because as soon as I connect the charging cable the M5.getBatteryVoltage() / 1000.0 giving me 4.35v but if I remove the charging cable then I get the actual battery voltages e.g 3.8v.
Is it possible that somehow I can read the actual battery voltages even if the device is connected to the charging cable?

@mtylerjr Thanks for your answer. This device is great to have full control but It is not fitting in my use case.