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st7735: make SPI Tx faster

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Most of the ceremony around pin toggling was in fact unnecessary. This
improves performance measurably (rougly 6% in one measurement) and cuts
down on binary size by 80 bytes.
This commit is contained in:
Ayke van Laethem
2019-10-10 20:35:50 +02:00
parent 955b3a56e8
commit dcfd9c066d
1 changed files with 2 additions and 15 deletions
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st7735/st7735.go
+2 -15
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@@ -383,21 +383,8 @@ func (d *Device) Data(data uint8) {
// Tx sends data to the display // Tx sends data to the display
func (d *Device) Tx(data []byte, isCommand bool) { func (d *Device) Tx(data []byte, isCommand bool) {
if isCommand { d.dcPin.Set(!isCommand)
d.csPin.High() d.bus.Tx(data, nil)
d.dcPin.Low()
d.csPin.Low()
d.bus.Tx(data, nil)
d.csPin.High()
} else {
d.csPin.High()
d.dcPin.High()
d.csPin.Low()
d.bus.Tx(data, nil)
d.csPin.High()
}
} }
// Size returns the current size of the display. // Size returns the current size of the display.