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Establishing serial communication over UART instead of USB in MAX25405 EVKIT

rsjawale24

The MAX25405EVKIT comes with a MAX32620FTHR board which is preprogrammed with custom binary file for the gesture recognition. The application note at Maxim Gesture Sensor EVKit Serial API (maximintegrated.com)

mentions "The serial interface can be implemented over the Universal Serial Bus (USB) virtual serial port or over a Universal Asynchronous Receiver-Transmitter (UART). The EV kit is shipped configured to use the USB serial port to work with the EV kit PC Graphical user Interface (GUI). If a UART serial interface is desired, custom firmware in binary format is available."

Upon researching more, I found the firmware_framework code that contains the code for gesture recognition compiled using mbed compiler.

The readme file says that a file called interface.h and interface.c define the communication protocol. When I open the interface.c file, I can see a comment in the code that says Option to implement serial API over UART instead of USB but there is only a MACRO set as #define macro_name 0 

I tried to change the 0 to 1 and compile the code, however, it does not compile successfully. The USBDevice library shows some error while compiling. 

Did anyone try to change the serial API over UART instead of USB? Was it successful?  

EDIT: I have successfully compiled the code for UART. However, I'll do some experiments and write introductory blogs before I re-program the MAX32620FTHR board with my firmware. 

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  • UPDATE:

    The main.cpp file has a function to check if any command request from user has been sent to the MAX32620FTHR board. So upon initializing the serial comm. in Arduino, I'm sending the following command -

    Serial.write("cmd_poll");

    The main.cpp then sends the poll result over serial comm. which I'm continuously polling and reading the status of Serial.read() in a variable. Still no success. 

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  • UPDATE:

    The main.cpp file has a function to check if any command request from user has been sent to the MAX32620FTHR board. So upon initializing the serial comm. in Arduino, I'm sending the following command -

    Serial.write("cmd_poll");

    The main.cpp then sends the poll result over serial comm. which I'm continuously polling and reading the status of Serial.read() in a variable. Still no success. 

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  • in reply to rsjawale24

    It should be poll instead of cmd_poll. I recommend trying something more deterministic like ver (should return string containing firmware version).

  • in reply to misaz

    I think I know where I made a mistake. When I compiled the framework code, I was getting an error in the compiler

    Error: Non-void function does not return a value [-Werror,-Wreturn-type] in "cmd.cpp", Line: 283, Col: 1

    I went to the cmd.cpp file and added a return 0; at the end.

    After which the code compiled without any errors.

    But this return 0; statement will always return a 0 on the execution on the function in cmd.cpp file. 

    And this may be the reason why I'm not receiving anything over UART.