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@@ -217,6 +365,20 @@
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Renode
+I find it a useful tool. Maybe you will, too! +
About Me: I Do Weird Hardware
+-
+
- Simmel: Contact Tracing with Audio +
- Chibitronics: Programming Stickers with Audio +
- Novena: Open Source Laptop +
- Senoko: Open Source Power Board for Novena +
About Renode
+-
+
- Whole-System Emulator +
- Supports concurrent emulation +
- Extensible with C# and Python +
- MIT Licensed +
- Windows, Mac, Linux +
About This Talk
+-
+
- Overview of Emulators +
- Oevrview of Weird Hardware +
- Cool things you can do +
Who will find this interesting?
+-
+
- Creators: Those making new boards or hardware +
- Integrators: Running CI on firmware files +
- Reverse Engineers: Understanding new hardware and firmware +
Creators: Making New Things!
+-
+
- Reusing an existing platform +
- Reusing an existing microcontroller +
- New microcontroller fron existing family +
Integrators: Making Sure Nothing Broke!
+-
+
- Hardware testing incompatible with cloud +
- ...it sure is effective, though +
- Hardware crunch makes it difficult to get hardware +
- Downloading software is much cheaper than shipping +
- Can run tests on every code push +
-
+
Reverse Engineers: What Is This Blob Doing?
+-
+
- Staring at code flow is enlightening, but time-consuming +
- What is it doing and how does it get there? +
- How can we make it do $x? +
What is an Emulator?
@@ -123,6 +192,13 @@What is a Computer?
+Example of Weird Hardware
@@ -206,6 +282,78 @@It's All About Small Victories
+-
+
- Serial ports are super rewarding +
- They're also usually simple! +
- They are easy to script +
Steps to Set Up a Serial Port
+-
+
- Enable peripheral +
- Set up clock +
- Mux GPIOs +
- Calculate baud rate +
- Write to UART TX register +
Steps to Set Up a Serial Port
+
+ Advantages of Emulation
+
+ Advantages of Emulation
+
+ Steps to Set Up a Serial Port
+-
+
- Interrupt Support +
- DMA +
Example Serial Port
+
+ {(long)Registers.RxTx, new DoubleWordRegister(this)
+ .WithValueField(0, 8,
+ writeCallback: (_, value) => {
+ this.TransmitCharacter((byte)value);
+ },
+ valueProviderCallback: _ => {
+ if(!TryGetCharacter(out var character))
+ {
+ this.Log(LogLevel.Warning, "Empty Rx FIFO.");
+ }
+ return character;
+ })
+ },
+ Robot Framework: Running Tests in CI
+
+ *** Test Cases ***
+ Should Read Acceleration
+ Create Machine
+ Create Terminal Tester ${UART}
+
+ Execute Command sysbus.twi1.lis2ds12 AccelerationX 10
+ Execute Command sysbus.twi1.lis2ds12 AccelerationY 5
+ Execute Command sysbus.twi1.lis2ds12 AccelerationZ -5
+
+ Start Emulation
+
+ Wait For Line On Uart x 9.997213 , y 4.997410 , z -4.999803
+ Debugging with GDB
Software Assumes Hardware Works
+-
+
- Rarely checks for sane ranges (why would you?) +
- TOC-TOU +
Incremental Changes
+-
+
- Small changes are very rewrding +
- Device will work with only partial implementation +