MAX7219 | Maxim MAX7219 8 digit LED driver HAL library

I have a text file called sorted_passes.txt with the following:

• NOAA18 23/08/2020 10:56:46 Max Elev: 67
• NOAA19 23/08/2020 19:08:02 Max Elev: 74
• NOAA15 23/08/2020 20:12:44 Max Elev: 87
• NOAA18 23/08/2020 22:19:47 Max Elev: 90

I would like to have a timer either do one of the following:

1. Count down to the next time in the .txt file and then after that time, move to the next time, again, counting down.
2. Count down to each time in the .txt file

My plan is to eventually have the countdown timer(s) display via a MAX7219 led board connected to raspberry pi.

So far, I have this python code:

I'm a javascript/typescript developer but newbee to Arduino/c++

I have a class (see h and cpp below) and have this compiler error:

I found this code online for controlling a max7219 8x8 matrix with an Arduino, and I am struggling to understand a few things about the code. Here is the whole code:

I'm trying to display a twitter stream on a MAX7219 4 in 1 dot matrix using tweepy and a Raspberry Pi. Until now I've been able to:

• Print a message on the matrix
• Create a streamer filtering tweets that contain a specific word.

But I'm not sure how to unify everything in a single script.

Here's the code I use to print in the matrix:

I am trying to write a header file that will drive a LED Matrix but I'm stuck with a syntax error which I cannot resolve

I've already added " ; " everywhere I thought it was necessary and checked https://www.nongnu.org/avr-libc/user-manual/pgmspace.html

I have a code that I downloaded from a webpage that is supposed to let me control a MAX7219 LED Matrix from a Web Interface using an ESP8266 (I'm using a NodeMcu v3.0 with an ESP8266-12E), but every time I try to compile the code, the following error comes out:

MAX7219_ESP8266:45: error: invalid conversion from 'uint8_t {aka unsigned char}' to 'MD_MAX72XX::moduleType_t' [-fpermissive]

MD_MAX72XX mx = MD_MAX72XX(CS_PIN, MAX_DEVICES);

^

In file included from E:\Searches\Desktop\MAX7219_ESP8266\MAX7219_ESP8266.ino:14:0:

E:\Documents\Arduino\libraries\MD_MAX72XX\src/MD_MAX72xx.h:362:3: error: initializing argument 1 of 'MD_MAX72XX::MD_MAX72XX(MD_MAX72XX::moduleType_t, uint8_t, uint8_t)' [-fpermissive]

MD_MAX72XX(moduleType_t mod, uint8_t csPin, uint8_t numDevices=1);

^

exit status 1 invalid conversion from 'uint8_t {aka unsigned char}' to 'MD_MAX72XX::moduleType_t' [-fpermissive]

What could I do in order to fix it? I tried using a different library and even modifying the library, but the same error came out.

The code is the following:

I try to integrate max7219 with UWP application running on Raspberry Pi 3.
max7219 connected to follow pins:

• 40 (GPIO21) - Clock
• 38 (GPIO20) - Data
• 36 (GPIO16) - CS

The native SPI ports: 19, 21, 23, 24, 26 are busy with touchpad.
I didn't found how to configure .NET Windows.Devices.SerialCommunication.SerialDevice to use GPIO ports, so I ported shiftOut from Arduino as follow:

I am stuck with HAL_Delay() function. When i call this function HAL_Delay() , control stuck in infinite loop. While searching for the problem, I found this

http://www.openstm32.org/forumthread2145#threadId2146

In this particular comment which states and i quote "There is problem with linker file please use the one attached. You need to map two banks of memory separately so first SRAM1 96K and then SRAM2 of 32K. I think this should be reported as bug in CubeMX as it generates bad linker file." and there are two files with .ld extension.

What i am looking is how to use this files within my project OR any other better option for dealing with this problem.

PS. I am using stm32l476 discovery board, Cube Mx 5.0.0 and Attolic True Studio.

EDIT

My project is having an RS485 communication where from where i take data and i have two task with that data, display it on MAX7219 display and send it to internet using sim800 gsm module.

The code where the control is stuck. note that this function is only called when it is doing GSM tasks.

I've been trying to control 4 MAX7219 controlled 8x8 LED arrays, totaling a 8x32 "screen". they are daisy chained, as seen here.

From what I've gathered, I have to send data for all of my arrays; each MAX7219 will process his own data, and the remaining data will "overflow" to the next MAX7219 to process.

This works very nicely when I address only one "row" of my screen: First row getting and displaying the data as intended

The code to achieve it is the following: