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apa102: allow to specify SPI Mode in Opts #16

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apa102: allow to specify SPI Mode in Opts #16

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70f3a51
APA102: Allow to specify SPI Mode
alexgth Jul 23, 2021
c768f7d
update go.mod
alexgth Jul 23, 2021
20c235b
apa102: make spimode part of the Opts
alexgth Aug 10, 2021
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18 changes: 13 additions & 5 deletions apa102/apa102.go
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Original file line number Diff line number Diff line change
Expand Up @@ -36,10 +36,11 @@ const NeutralTemp uint16 = 6500

// DefaultOpts is the recommended default options.
var DefaultOpts = Opts{
NumPixels: 150, // 150 LEDs is a common strip length.
Intensity: 255, // Full blinding power.
Temperature: 5000, // More pleasing white balance than NeutralTemp.
DisableGlobalPWM: false, // Use full 13 bits range.
NumPixels: 150, // 150 LEDs is a common strip length.
Intensity: 255, // Full blinding power.
Temperature: 5000, // More pleasing white balance than NeutralTemp.
DisableGlobalPWM: false, // Use full 13 bits range.
SpiMode: spi.Mode3, // SPI Mode3 works on most devices.
}

// PassThruOpts makes the driver draw RGB pixels exactly as specified.
Expand All @@ -51,6 +52,7 @@ var PassThruOpts = Opts{
Intensity: 255,
Temperature: NeutralTemp,
DisableGlobalPWM: true,
SpiMode: spi.Mode3,
}

// Opts defines the options for the device.
Expand Down Expand Up @@ -81,6 +83,12 @@ type Opts struct {
// to 8 bits, this also disables the dynamic perceptual mapping of intensity
// since there is not enough bits of resolution to do it effectively.
DisableGlobalPWM bool
// SpiMode sets the clock polarity and phase as one of the 4 possible SPI Modes.
//
// Most devices can use spi.Mode3, but the Raspberry Pi 3 secondary SPI port
// for example does not support this Mode. You may need to use spi.Mode0
// in this and similar cases.
SpiMode spi.Mode
}

// New returns a strip that communicates over SPI to APA102 LEDs.
Expand All @@ -93,7 +101,7 @@ type Opts struct {
// https://en.wikipedia.org/wiki/Flicker_fusion_threshold is a recommended
// reading.
func New(p spi.Port, o *Opts) (*Dev, error) {
c, err := p.Connect(20*physic.MegaHertz, spi.Mode3, 8)
c, err := p.Connect(20*physic.MegaHertz, o.SpiMode, 8)
if err != nil {
return nil, err
}
Expand Down