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Add orientation views to led_matrix() #8

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Add orientation views to led_matrix() #8

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30 changes: 23 additions & 7 deletions src/led.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -55,9 +55,12 @@ ColorTypes.base_color_type(::Type{RGB565}) = RGB565


"""
led_matrix()
led_matrix(orientation::Symbol)

Returns an 8x8 matrix of `RGB565` elements that is memory-mapped to the Sense HAT LED Matrix.
Returns an 8x8 matrix view of `RGB565` elements that is memory-mapped to the Sense HAT LED Matrix.

Orientation can be set to: default, right, left, invert
See the example below for usage

While it is possible to invoke the function multiple times (each returning different
arrays), it is generally preferable to assign it once into a `const` variable so as to
Expand All @@ -66,18 +69,31 @@ minimise the number of open file handlers.
# Example

```
using SenseHat
using ColorTypes

const LED = led_matrix()

LED[:] = SenseHat.JULIA_LOGO
sleep(3)
LED[:] = RGB(0,0,0)
LED[:] .= colorant"blue"

# Make the display upside-down, top points to HDMI connector
const LED2 = led_matrix(:invert) # Make the display upside-down, top points to HDMI connector
LED2[:] = SenseHat.JULIA_LOGO
sleep(3)
LED2 .= colorant"black"
```

"""
led_matrix() = Mmap.mmap(LED_FB_DEVICE[], Array{RGB565,2}, (8,8); grow=false)
led_matrix(orientation::Symbol) = led_matrix(Val{orientation})

led_matrix() = led_matrix(:default)
led_matrix(::Type{Val{:default}}) = @view PermutedDimsArray(Mmap.mmap(LED_FB_DEVICE[],
Array{RGB565,2}, (8,8); grow=false),(2,1))[:,:];
led_matrix(::Type{Val{:right}}) = @view Mmap.mmap(LED_FB_DEVICE[],
Array{RGB565,2}, (8,8); grow=false)[8:-1:1,:];
led_matrix(::Type{Val{:left}}) = @view Mmap.mmap(LED_FB_DEVICE[],
Array{RGB565,2}, (8,8); grow=false)[:,8:-1:1];
led_matrix(::Type{Val{:invert}}) = @view PermutedDimsArray(Mmap.mmap(LED_FB_DEVICE[],
Array{RGB565,2}, (8,8); grow=false),(2,1))[8:-1:1,8:-1:1];



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16 changes: 8 additions & 8 deletions src/led_extra.jl
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Expand Up @@ -7,12 +7,12 @@ const JULIA_LOGO = begin
p = RGB565(0.667,0.475,0.757)
z = RGB565(0.0,0.0,0.0)

permutedims([z z z z z z z z;
z z z G G z z z;
z z G g g G z z;
z z G g g G z z;
z R R G G P P z;
R r r R P p p P;
R r r R P p p P;
z R R z z P P z], (2,1)) # transpose to correct orientation
[z z z z z z z z;
z z z G G z z z;
z z G g g G z z;
z z G g g G z z;
z R R G G P P z;
R r r R P p p P;
R r r R P p p P;
z R R z z P P z]; # transpose to correct orientation
end