From f662cee896c2d37b67b56be930f496010a9cec81 Mon Sep 17 00:00:00 2001
From: Xevion <xevioni@yandex.com>
Date: Sun, 17 Jul 2022 14:31:50 -0500
Subject: [PATCH] New Post: Restricted memory and Data Framing Tricks

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diff --git a/_posts/2022-07-16-restricted-memory-and-data-framing-tricks.md b/_posts/2022-07-16-restricted-memory-and-data-framing-tricks.md
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+---
+layout: default
+title:  Restricted Memory & Data Framing Tricks
+date:   2022-07-16 13:51:00 -0500
+tags:   c memory embedded ti msp430 union
+excerpt_separator: <!--more-->
+_preview_description: 
+---
+
+Working on microcontrollers is a far cry from the essentially unlimited memory and floating point operations available
+in _Python_ and other high level languages. Here's what I have been learning at my _first_ internship...
+
+<!--more-->
+
+For the past 7 weeks I've been working at **Black Pearl Technology** in a Software Development Internship.
+To be honest, I really wasn't expecting to be getting an internship this summer, and while I was sad about it, I
+was loaded up on summer courses such that I'd have a leisurely fun summer doing what I wanted.
+
+
+Well, fortunately (for my career, not so much for my stress levels), I managed to snag this internship at the last second,
+and I've been learning _so_ much.
+
+## Restricted Memory
+
+While working there, I was assigned to a project that required usage of a Texas Instruments MSP430 microcontroller.
+While there were many quirks with working on MCUs like this (like having to ditch JetBrains & VSCode altogether!), the
+biggest quirk isn't working with C: it's working without `malloc` altogether.
+
+On low memory devices like this, memory is extremely limited and there is no certainty that your code will not leak memory.
+Usage of `malloc` and other dynamic memory allocation methods are considered innately dangerous - while there is a chance
+you will write perfect code that will properly allocate/deallocate, you can't be certain that your complex program
+won't run out of memory on such a small footprint to work with.
+
+Instead, variables are assigned either inside methods for short periods (and passed around), or they are assigned statically and globally.
+It appears that the libraries I use personally prefer globally accessible variables, which 99% of the time, is very wrong - but in
+Microcontroller land, global variables are your friend.
+
+```c
+#include <stdint.h>
+
+uint8_t uid[4];  // A unique identifier
+
+int main(void) {
+    UID_generate(uid, 4); // Pass the pointer, the function writes to it (and does not return it)
+    UART_putUid(uid, 4); // Write the UID to UART
+}
+```
+```c
+void UID_generate(uint8_t uid, int length) {
+    uint8_t i = 0;
+    while(i < length)
+        uid[i++] = RANDOM_char();
+}
+
+void UART_putUid(uint8_t* uid, int length) {
+    uint8_t i = 0;
+    while(i < length)
+        UART_putChar(uid[i++]);
+}
+
+void UART_putChar(uint8_t value) {
+    while(!(UCB0IFG & 0x1));
+	    UCB0TXBUF = value;
+}
+```
+
+<center>
+    <i>
+        <small>
+            UART is a serial communication technology we use to send characters & text to the COM terminal.
+            For more information, click <a href="https://www.youtube.com/watch?v=VBRUyLcqXV4">here</a>.
+        </small>
+    </i>
+</center>
+
+There's not much more to this - don't use `malloc`, stick to the _stack_ for actively executing methods and use _global variables_
+when you need to go into low power mode while maintaining state.
+
+Overall, this doesn't hinder ones ability to write working code - the features are still there, but the way you access
+methods, store data & manipulate is re-organized - sometimes at the detriment to quality  & refactoring efforts.
+
+## Data Framing Tricks
+
+While at my internship, I used my MSP430 microcontroller to communicate with various devices over UART and SPI. I also sent
+commands to a ISO15693 NFC wafers. All of these interfaces are extremely low level and the best documentation I have
+is often just a PDF and some random code scattered across the internet. There is no library to speak of, usually.
+
+Communicating at a low level like this requires reading and writing individual bytes of data into _frames_, or arrays
+of bytes with a well-defined structure.
+
+<center>
+    <b>ISO15693 Write Single Block (Addressed)</b> <a href="http://www.ti.com/lit/an/sloa141/sloa141.pdf" style="color: #90bcff">source</a>
+</center>
+
+[![ISO15693 Write Single Block Diagram][iso15693-diagram]][iso15693-diagram-edn]
+
+Traditionally, commands are built statically all at once in a mostly hardcoded manner:
+
+```c
+uint8_t offset = 0;
+ui8TRFBuffer[offset++] = 0x61;
+ui8TRFBuffer[offset++] = 0x21;
+ui8TRFBuffer[offset++] = 0xA7;
+ui8TRFBuffer[offset++] = 0x3E;
+ui8TRFBuffer[offset++] = 0xFF;
+ui8TRFBuffer[offset++] = 0x58;
+// ... You get the idea
+```
+
+Instead, what if we could format this into a `struct` that we could pass around on the stack with a pointer?
+
+```c
+struct AddressedSingleBlockWrite {
+    uint8_t Flag;
+    uint8_t Command;
+    uint8_t Address[8];
+    uint8_t Block;
+    uint8_t Data[4];
+};
+
+int main() {
+    struct AddressedSingleBlockWrite command;
+    command.Flag = 0x20 | 0x40;
+    command.Command = 0x21;
+    uint8_t address[8] = {0xA7, 0x3E, 0xFF, 0x58, 0x21, 0x32, 0x10, 0xFE};
+    memcpy(&command.Address, &address, sizeof(command.Address));
+    command.Block = 0x05;
+    uint8_t data[4] = {0x11, 0x22, 0x33, 0x44};
+    memcpy(&command.Data, &data, sizeof(command.Data));
+}
+```
+
+
+Now we have a defined structure in our source code and we can move and manipulate various parts of our command
+structures without having to deal with hardcoded offsets. Still though, if we want to copy this command structure into
+the buffer, we have to individually copy each part of the command - which will break the second we modify its structure.
+
+There's a fantastic solution for it: **Unions**.
+
+```c
+union ASBWUnion {
+    uint8_t data[15];
+    struct AddressedSingleBlockWrite marshalled;
+};
+```
+
+```c
+union ASBWUnion demarshalled;
+demarshalled.marshalled = command;
+
+for (int i = 0; i < 15; i++)
+    printf("%x ", demarshalled.data[i]);
+```
+
+```sass
+60 21 a7 3e ff 58 21 32 10 fe 5 11 22 33 44
+```
+
+`union`s are special datatypes that share a single memory footprint (equal to it's largest member) starting at the exact same point memory.
+They combine neatly with `struct`s to allow us to represent the `AddressedSingleBlockWrite` as a single byte array.
+
+<center>
+<b>Note</b>: When implementing this, I do recommend that you create macro definitions for the length of the final command structure.
+This will help greatly when it comes to refactoring or making adjustments to your command structure.
+</center>
+
+#### Reversing Endianness
+
+If you check out TI's [sloa141][sloa141] PDF on ISO 15693 commands, you'll notice that many of the examples have
+sections of their bytes reversed - sections like the _Address_ and _Data_ sections, but not the entire compiled command.
+
+One such example, `60 21 9080C2E5D2C407E0 06 55443322` (spaces inserted to split it apart), has the _Flag_, _Command_,
+_Address_, _Block_ and _Data_ stored in that order. But for this particular example, how could the address `E007C4D2E5C28090`?
+How could the data be `0x22334455`? It's the Endianness - the order of bytes as the underlying architecture understands it.
+
+While for my particular usage, reversing endianness was not needed, it's an interesting problem that can  be solved 
+quite easily with our new data structure.
+
+```c
+void ReverseEndianness(struct AddressedSingleBlockWrite asbw) {
+    uint8_t temp;
+    int i = 0;
+    
+    for (; i < 4; i++) {
+        temp = command.Address[i];
+        command.Address[i] = command.Address[8 - i - 1];
+        command.Address[8 - i - 1] = temp;
+    }
+    
+    for (i = 0; i < 2; i++) {
+        uint8_t temp = command.Data[4 - i - 1];
+        command.Data[4 - i - 1] = command.Data[i];
+        command.Data[i] = temp;
+    }
+}
+```
+
+[iso15693-diagram]: /assets/img/iso15693_diagram.png
+[iso15693-diagram-edn]: /assets/iso15693_diagram.edn
+[sloa141]: http://www.ti.com/lit/an/sloa141/sloa141.pdf
\ No newline at end of file
diff --git a/assets/img/iso15693_diagram.png b/assets/img/iso15693_diagram.png
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diff --git a/assets/img/iso15693_diagram.svg b/assets/img/iso15693_diagram.svg
new file mode 100644
index 0000000..5f5d2d6
--- /dev/null
+++ b/assets/img/iso15693_diagram.svg
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/assets/iso15693_diagram.edn b/assets/iso15693_diagram.edn
new file mode 100644
index 0000000..e10603d
--- /dev/null
+++ b/assets/iso15693_diagram.edn
@@ -0,0 +1,35 @@
+(defattrs :bg-green {:fill "#a0ffa0"})
+(defattrs :bg-yellow {:fill "#ffffa0"})
+(defattrs :bg-pink {:fill "#ffb0a0"})
+(defattrs :bg-cyan {:fill "#a0fafa"})
+(defattrs :bg-purple {:fill "#e4b5f7"})
+
+(defattrs :vertical [:plain {:writing-mode "vertical-rl"}])
+
+(def row-height 70)
+(def boxes-per-row 15)
+
+(draw-column-headers {:stroke "#ffffff"})
+(draw-box (text "Flag" :vertical) :bg-purple)
+(draw-box (text "Command" [:vertical {:font-size 11}]) :bg-cyan)
+(draw-box (text "Address" :math) [{:span 8} :bg-yellow])
+(draw-box (text "Block" :vertical) :bg-pink)
+(draw-box "Data" [{:span 4} :bg-green])
+
+(draw-box 0x61 [:bg-purple {:next-row-height 30}])
+(draw-box 0x21 :bg-cyan)
+
+(draw-box 0xA7 :bg-yellow)
+(draw-box 0x3E :bg-yellow)
+(draw-box 0xFF :bg-yellow)
+(draw-box 0x58 :bg-yellow)
+(draw-box 0x21 :bg-yellow)
+(draw-box 0x32 :bg-yellow)
+(draw-box 0x10 :bg-yellow)
+(draw-box 0xFE :bg-yellow)
+
+(draw-box 0x05 :bg-pink)
+(draw-box 0x11 :bg-green)
+(draw-box 0x22 :bg-green)
+(draw-box 0x33 :bg-green)
+(draw-box 0x44 :bg-green)
\ No newline at end of file