/
ssd1351.go
299 lines (265 loc) · 6.97 KB
/
ssd1351.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
// Package ssd1351 implements a driver for the SSD1351 OLED color displays.
//
// Datasheet: https://download.mikroe.com/documents/datasheets/ssd1351-revision-1.3.pdf
//
package ssd1351 // import "tinygo.org/x/drivers/ssd1351"
import (
"errors"
"image/color"
"machine"
"time"
"tinygo.org/x/drivers"
)
var (
errDrawingOutOfBounds = errors.New("rectangle coordinates outside display area")
errBufferSizeMismatch = errors.New("buffer length does not match with rectangle size")
)
// Device wraps an SPI connection.
type Device struct {
bus drivers.SPI
dcPin machine.Pin
resetPin machine.Pin
csPin machine.Pin
enPin machine.Pin
rwPin machine.Pin
width int16
height int16
rowOffset int16
columnOffset int16
bufferLength int16
}
// Config is the configuration for the display
type Config struct {
Width int16
Height int16
RowOffset int16
ColumnOffset int16
}
// New creates a new SSD1351 connection. The SPI wire must already be configured.
func New(bus drivers.SPI, resetPin, dcPin, csPin, enPin, rwPin machine.Pin) Device {
return Device{
bus: bus,
dcPin: dcPin,
resetPin: resetPin,
csPin: csPin,
enPin: enPin,
rwPin: rwPin,
}
}
// Configure initializes the display with default configuration
func (d *Device) Configure(cfg Config) {
if cfg.Width == 0 {
cfg.Width = 128
}
if cfg.Height == 0 {
cfg.Height = 128
}
d.width = cfg.Width
d.height = cfg.Height
d.rowOffset = cfg.RowOffset
d.columnOffset = cfg.ColumnOffset
d.bufferLength = d.width
if d.height > d.width {
d.bufferLength = d.height
}
// configure GPIO pins
d.dcPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
d.resetPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
d.csPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
d.enPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
d.rwPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
// reset the device
d.resetPin.High()
time.Sleep(100 * time.Millisecond)
d.resetPin.Low()
time.Sleep(100 * time.Millisecond)
d.resetPin.High()
time.Sleep(200 * time.Millisecond)
d.rwPin.Low()
d.dcPin.Low()
d.enPin.High()
// Initialization
d.Command(SET_COMMAND_LOCK)
d.Data(0x12)
d.Command(SET_COMMAND_LOCK)
d.Data(0xB1)
d.Command(SLEEP_MODE_DISPLAY_OFF)
d.Command(SET_FRONT_CLOCK_DIV)
d.Data(0xF1)
d.Command(SET_MUX_RATIO)
d.Data(0x7F)
d.Command(SET_REMAP_COLORDEPTH)
d.Data(0x72)
d.Command(SET_COLUMN_ADDRESS)
d.Data(0x00)
d.Data(0x7F)
d.Command(SET_ROW_ADDRESS)
d.Data(0x00)
d.Data(0x7F)
d.Command(SET_DISPLAY_START_LINE)
d.Data(0x00)
d.Command(SET_DISPLAY_OFFSET)
d.Data(0x00)
d.Command(SET_GPIO)
d.Data(0x00)
d.Command(FUNCTION_SELECTION)
d.Data(0x01)
d.Command(SET_PHASE_PERIOD)
d.Data(0x32)
d.Command(SET_SEGMENT_LOW_VOLTAGE)
d.Data(0xA0)
d.Data(0xB5)
d.Data(0x55)
d.Command(SET_PRECHARGE_VOLTAGE)
d.Data(0x17)
d.Command(SET_VCOMH_VOLTAGE)
d.Data(0x05)
d.Command(SET_CONTRAST)
d.Data(0xC8)
d.Data(0x80)
d.Data(0xC8)
d.Command(MASTER_CONTRAST)
d.Data(0x0F)
d.Command(SET_SECOND_PRECHARGE_PERIOD)
d.Data(0x01)
d.Command(SET_DISPLAY_MODE_RESET)
d.Command(SLEEP_MODE_DISPLAY_ON)
}
// Display does nothing, there's no buffer as it might be too big for some boards
func (d *Device) Display() error {
return nil
}
// SetPixel sets a pixel in the buffer
func (d *Device) SetPixel(x int16, y int16, c color.RGBA) {
if x < 0 || y < 0 || x >= d.width || y >= d.height {
return
}
d.FillRectangle(x, y, 1, 1, c)
}
// setWindow prepares the screen memory to be modified at given coordinates
func (d *Device) setWindow(x, y, w, h int16) {
x += d.columnOffset
y += d.rowOffset
d.Command(SET_COLUMN_ADDRESS)
d.Tx([]byte{uint8(x), uint8(x + w - 1)}, false)
d.Command(SET_ROW_ADDRESS)
d.Tx([]byte{uint8(y), uint8(y + h - 1)}, false)
d.Command(WRITE_RAM)
}
// FillRectangle fills a rectangle at given coordinates with a color
func (d *Device) FillRectangle(x, y, width, height int16, c color.RGBA) error {
if x < 0 || y < 0 || width <= 0 || height <= 0 ||
x >= d.width || (x+width) > d.width || y >= d.height || (y+height) > d.height {
return errDrawingOutOfBounds
}
d.setWindow(x, y, width, height)
c565 := RGBATo565(c)
c1 := uint8(c565 >> 8)
c2 := uint8(c565)
dim := int16(width * height)
if d.bufferLength < dim {
dim = d.bufferLength
}
data := make([]uint8, dim*2)
for i := int16(0); i < dim; i++ {
data[i*2] = c1
data[i*2+1] = c2
}
dim = int16(width * height)
for dim > 0 {
if dim >= d.bufferLength {
d.Tx(data, false)
} else {
d.Tx(data[:dim*2], false)
}
dim -= d.bufferLength
}
return nil
}
// FillRectangleWithBuffer fills a rectangle at given coordinates with a buffer
func (d *Device) FillRectangleWithBuffer(x, y, width, height int16, buffer []color.RGBA) error {
if x < 0 || y < 0 || width <= 0 || height <= 0 ||
x >= d.width || (x+width) > d.width || y >= d.height || (y+height) > d.height {
return errDrawingOutOfBounds
}
dim := int16(width * height)
l := int16(len(buffer))
if dim != l {
return errBufferSizeMismatch
}
d.setWindow(x, y, width, height)
bl := dim
if d.bufferLength < dim {
bl = d.bufferLength
}
data := make([]uint8, bl*2)
offset := int16(0)
for dim > 0 {
for i := int16(0); i < bl; i++ {
if offset+i < l {
c565 := RGBATo565(buffer[offset+i])
c1 := uint8(c565 >> 8)
c2 := uint8(c565)
data[i*2] = c1
data[i*2+1] = c2
}
}
if dim >= d.bufferLength {
d.Tx(data, false)
} else {
d.Tx(data[:dim*2], false)
}
dim -= d.bufferLength
offset += d.bufferLength
}
return nil
}
// DrawFastVLine draws a vertical line faster than using SetPixel
func (d *Device) DrawFastVLine(x, y0, y1 int16, c color.RGBA) {
if y0 > y1 {
y0, y1 = y1, y0
}
d.FillRectangle(x, y0, 1, y1-y0+1, c)
}
// DrawFastHLine draws a horizontal line faster than using SetPixel
func (d *Device) DrawFastHLine(x0, x1, y int16, c color.RGBA) {
if x0 > x1 {
x0, x1 = x1, x0
}
d.FillRectangle(x0, y, x1-x0+1, 1, c)
}
// FillScreen fills the screen with a given color
func (d *Device) FillScreen(c color.RGBA) {
d.FillRectangle(0, 0, d.width, d.height, c)
}
// SetContrast sets the three contrast values (A, B & C)
func (d *Device) SetContrast(contrastA, contrastB, contrastC uint8) {
d.Command(SET_CONTRAST)
d.Tx([]byte{contrastA, contrastB, contrastC}, false)
}
// Command sends a command byte to the display
func (d *Device) Command(command uint8) {
d.Tx([]byte{command}, true)
}
// Data sends a data byte to the display
func (d *Device) Data(data uint8) {
d.Tx([]byte{data}, false)
}
// Tx sends data to the display
func (d *Device) Tx(data []byte, isCommand bool) {
d.dcPin.Set(!isCommand)
d.csPin.Low()
d.bus.Tx(data, nil)
d.csPin.High()
}
// Size returns the current size of the display
func (d *Device) Size() (w, h int16) {
return d.width, d.height
}
// RGBATo565 converts a color.RGBA to uint16 used in the display
func RGBATo565(c color.RGBA) uint16 {
r, g, b, _ := c.RGBA()
return uint16((r & 0xF800) +
((g & 0xFC00) >> 5) +
((b & 0xF800) >> 11))
}