I didn't get this far in computer science, just saying. When it's time to copy the values into the serial port register, that's a RAM load then a register to register copy, so I don't think you'd ever see the character literals in your assembly. Regardless, the C compiler isn't going to compile a string literal to literal values in assembly, it's going to put those characters into RAM, then store an address to them. It is very likely that youâll need to print the generated JSON in your Serial monitor for debugging purposes, to do that: root.printTo(Serial) After having your information encoded in a JSON string you could post it to another device or web service as shown in the next example. String literals get allocated into RAM, too depending on the platform they're allocated lower in the stack space, nearer to other read-only program data, because the C specification says that you shouldn't try to mutate a string literal. So in assembly, that looks like "copy this register into the RAM address bus, do a couple of other things (you have to wait for the RAM), then copy the RAM data bus into this register." Sort of the whole purpose of "writing" assembly by writing C, as best I understand this, is that the compiler allocates variables into writes and loads to and from the RAM, via RAM access registers. This tutorial targets version 6 of the ArduinoJson library. Smarter (better) disassemblers use various techniques to figure this stuff out, a common one is only attempting to disassemble code lines that are executed.įrankly, I can't find the characters "H e l l o" anywhere in the assembly In this tutorial we will learn how to print all the keys of a JsonDocument, using the ESP32 and the Arduino core. You do not indicate the methodologies being used: JSON lib, brute-force. If I try the same Serial.println(myObject'weather'0'id') all I get is null. If you disassemble this in most disassemblers (static) it can't tell the difference between the data I've placed there and code, so it'll try (unsuccessfully) to disassemble it, usually producing garbage code that makes no sense. I cannot fathom how to get the weather id from this string. My_string db "Hello World!", 0 // Assemble the "string" as if it were code, null terminate offset my_string Jmp // jump forward to first macro (past the Hello World string) Sometimes putting the data in the code itself and jumping over it creates faster functions, or easier to write macros, or smaller functions that take up less code-space. In assembly, data can be stored pretty much anywhere the user can figure out where to cram it. Then, there is another line of code sending the entire dataAux variable to the Serial port, and therefore, as he uses Serial.println(dataAux), there is a last new linechar after the closing bracket. Two lines, send via Serial Monitor, one at a time. The Arduino code is working fine when inputting data via Arduino Serial Monitor. The disassembler tried to make these commands, but they're the data.starting at address 6ae we have 48, 65, 6c, 6c, 6f. To mark the end of a message, I'm using the string '', informing both Arduino and Python that the message was completely delivered.
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