c3d/db48x

RPL runtime for the DM42 calculator, in the spirit of HP48/49/50

db48x's Issues

Slow editing on battery

Editing while on battery power is really slow

Symbolic integration

Complex arithmetic

Implement complex arithmetic, i.e. four operations plus conjugate

Symbolic differentiation

Menu display for settings

The menu should show if FIX is selected, and if so, show something like Fix 3 if that's the current number of digits.

Plotting a function

Do not write default settings in state file

When a particular setting corresponds to the defaults, do not write to file.

• This will improve the behavior when merging a state
• There is no need to change a default when loading from clean state

Drawing a Bezier curve

Tensor computations

Need to think about how to represent tensors.
A problem is to deal with covariant / contravariant operations.

Move menus to DM42 target-specific code

The exact menu layout is by construction specific to a given calculator model, so better move it to the dm42 directory instead of having it in the shared code.

Complex types

Implement rectangular and polar complex types

Matrix writer

Complex logarithmic and exponential functions

Implement logarithmic and exponential functions for complex numbers.

Complex circular functions

Implement circular functions on complex values

Unit types

Implement types represeneting units

Drawing circle, ellipse, arcs

Selecting from VariablesMenu in program edit

Selecting a menu item from VariablesMenu in program edit mode should insert
a RCL or STO command, not execute it.

Graphic objects

Strategies to display large objects

The current strategy to display a large object on the stack is to insert an ellipsis in the middle. There are other possbile strategies, including:

• Switcing to a smaller font
• Displaying on multiple lines (mostly applicable for first level)
• Cutting left or right (might be better for some objects)

This should probably be a setting.

Symbolic expand and factor

Arithmetic on vectors

Implement arithmetic on vectors, e.g. [ 1 2 3 ] [4 5 6] +

Drawing a pixel

Function to draw a single pixel at given coordinates

Numerical integration

FAT filesystem access

Writing objects to files, reading objects from files, other operations?

Numerical solver

Do not attempt to load DM42 state file

The get_reset_state_file() uses information stored by the firmware, presumably somewhere in flash memory. This is shared between DM42 and DB48X. When you switch between the two programs, they attempt to read each other's state file.

On the DM42, this manifests are a Memory Clear message, which seems perfectly reasonable, but also a more annoying Cannot read /STATE if trying to load a new state. The workaround is to first request a clean state, and then you can load a DM42 state (in a .f32 file).

On DB48X, this manifests as an error during parsing, because we read a binary file expecting to find some RPL source code. This can be avoided by ignoring any file that ends in .f42.

Hang when waking up on battery

There must be something wrong with the setup of timers when waking up from sleep that causes the timers to be out of sync, and generates a temporary freeze of the machine.

A sequence that tends to reproduce this quite often is to start editing something on USB power, then remove USB, keep editing a little, switch off/on. At that point, editing either stops working, or will after a few keystrokes. However, as soon as USB is powered back in, the machine wakes up and catches up on all the pending keystrokes.

Vector graphic object

Symbolic equation manipulation

Angle types

Implement angle types for degrees, radians and grads

This could be shown with a special postfix character:
123°, 123π or 123g

(not sure about subscript for grads)

Plotting a parametric curve

Incorrect promotion to real

When typing 1 'X' +, you get '1.+X' instead of 1+X.

Arbitrary-precision real numbers

Look at how newRPL does it. They implement up to 2000 digits.
That should be sufficient for most use cases.

2^128 does not work

Typing 2 128 y^x gives 1 instead of the expected result.

Caching of stack level rendering

This is done by newRPL. Not sure if this is worth the effort.

Beep function

Tag types

Tag types are used to tag another object with some information.

For example, typing :Hello:1.5 should display as Hello:1.5.
Ideally, the tag should appear on the left on the stack.

Graphical object rendering on stack

Equation writer

Settings command for max non-scientific

Add a settings command to change the max exponent before switching to scientific mode. This corresponds to the value of settings::max_nonsci.

Text operations

Switch to 20 digits displayed by default

The default number of digits overflows with the current font. Probably a good idea to use a smaller value as a default for StandardDisplay.

Flags

Implementing functions like CF, SF and the like

Open question is whether we try to interpret special values that control the way the calculator behaves.

Symbolic simplification

Implement binary arithmetic in arbitrary bases

Implement the possibility to do binary arithmetic in arbitrary bases

The base will be selected using the Base command, shown in BasesMenu.

#1234AH will be a fixed hex number, which is always shown as #1234H irrespective of Base setting.
#1234A will be a based number, and its display will be affected by the Base setting.

Rendering of fancy exponent in equations

An equation containing a decimal number will show it using "normal" characters for the exponent instead of the superscript.

Drawing a line

SQ for integer creates an algebraic

Using 2 sq does not compute 4 but an algebraic (2)^2

Parsing for algebraic objects

Parsing an algebraic object like '1+X', including precedence and parentheses.

Arithmetic on matrix objects

Arithmetic operations on matrix objects, e.g.

[ [ 1 2]
  [3 4] ]

[ [5 6]
  [7 8] ]

+