From c8e62562b5ecd740e793afe1edabe57c813b175b Mon Sep 17 00:00:00 2001
From: Daniel Esteban <conejo@conejo.me>
Date: Thu, 30 Jan 2020 08:55:48 +0100
Subject: [PATCH] added scroll functionality to st7735

---
 st7735/registers.go |  2 ++
 st7735/st7735.go    | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/st7735/registers.go b/st7735/registers.go
index 0fb01c7..dca9c60 100644
--- a/st7735/registers.go
+++ b/st7735/registers.go
@@ -46,6 +46,8 @@ const (
 	PWCTR6     = 0xFC
 	GMCTRP1    = 0xE0
 	GMCTRN1    = 0xE1
+	VSCRDEF    = 0x33
+	VSCRSADD   = 0x37
 
 	GREENTAB   Model = 0
 	MINI80x160 Model = 1
diff --git a/st7735/st7735.go b/st7735/st7735.go
index 9c6bbec..5909d20 100644
--- a/st7735/st7735.go
+++ b/st7735/st7735.go
@@ -224,6 +224,27 @@ func (d *Device) setWindow(x, y, w, h int16) {
 	d.Command(RAMWR)
 }
 
+// SetScrollWindow sets an area to scroll with fixed top and bottom parts of the display
+func (d *Device) SetScrollArea(topFixedArea, bottomFixedArea int16) {
+	d.Command(VSCRDEF)
+	d.Tx([]uint8{
+		uint8(topFixedArea >> 8), uint8(topFixedArea),
+		uint8(d.height - topFixedArea - bottomFixedArea>>8), uint8(d.height - topFixedArea - bottomFixedArea),
+		uint8(bottomFixedArea >> 8), uint8(bottomFixedArea)},
+		false)
+}
+
+// SetScroll sets the vertical scroll address of the display.
+func (d *Device) SetScroll(line int16) {
+	d.Command(VSCRSADD)
+	d.Tx([]uint8{uint8(line >> 8), uint8(line)}, false)
+}
+
+// SpotScroll returns the display to its normal state
+func (d *Device) StopScroll() {
+	d.Command(NORON)
+}
+
 // FillRectangle fills a rectangle at a given coordinates with a color
 func (d *Device) FillRectangle(x, y, width, height int16, c color.RGBA) error {
 	k, i := d.Size()