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ssd1306: avoid unnecessary heap allocations (#767)

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* ssd1306: avoid unnecessary heap allocations

* ssd1306: extract i2c and spi bus implementations

* ssd1306: refactor tests -- show fps and heap usage

* ssd1306: bring back the lost exported methods

* Adjust examples

* Fix smoketests for ssd1306
This commit is contained in:
Yurii Soldak
2025-07-13 14:53:58 +02:00
committed by deadprogram
parent 45fad80c3e
commit ae9e8f915e
12 changed files with 316 additions and 348 deletions
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examples/ssd1306/i2c_128x32/main.go
-51
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@@ -1,51 +0,0 @@
package main
import (
"machine"
"image/color"
"time"
"tinygo.org/x/drivers/ssd1306"
)
func main() {
machine.I2C0.Configure(machine.I2CConfig{
Frequency: machine.TWI_FREQ_400KHZ,
})
display := ssd1306.NewI2C(machine.I2C0)
display.Configure(ssd1306.Config{
Address: ssd1306.Address_128_32,
Width: 128,
Height: 32,
})
display.ClearDisplay()
x := int16(0)
y := int16(0)
deltaX := int16(1)
deltaY := int16(1)
for {
pixel := display.GetPixel(x, y)
c := color.RGBA{255, 255, 255, 255}
if pixel {
c = color.RGBA{0, 0, 0, 255}
}
display.SetPixel(x, y, c)
display.Display()
x += deltaX
y += deltaY
if x == 0 || x == 127 {
deltaX = -deltaX
}
if y == 0 || y == 31 {
deltaY = -deltaY
}
time.Sleep(1 * time.Millisecond)
}
}
examples/ssd1306/i2c_128x64/main.go
-60
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@@ -1,60 +0,0 @@
// This example shows how to use 128x64 display over I2C
// Tested on Seeeduino XIAO Expansion Board https://wiki.seeedstudio.com/Seeeduino-XIAO-Expansion-Board/
//
// According to manual, I2C address of the display is 0x78, but that's 8-bit address.
// TinyGo operates on 7-bit addresses and respective 7-bit address would be 0x3C, which we use below.
//
// To learn more about different types of I2C addresses, please see following page
// https://www.totalphase.com/support/articles/200349176-7-bit-8-bit-and-10-bit-I2C-Slave-Addressing
package main
import (
"machine"
"image/color"
"time"
"tinygo.org/x/drivers/ssd1306"
)
func main() {
machine.I2C0.Configure(machine.I2CConfig{
Frequency: machine.TWI_FREQ_400KHZ,
})
display := ssd1306.NewI2C(machine.I2C0)
display.Configure(ssd1306.Config{
Address: 0x3C,
Width: 128,
Height: 64,
})
display.ClearDisplay()
x := int16(0)
y := int16(0)
deltaX := int16(1)
deltaY := int16(1)
for {
pixel := display.GetPixel(x, y)
c := color.RGBA{255, 255, 255, 255}
if pixel {
c = color.RGBA{0, 0, 0, 255}
}
display.SetPixel(x, y, c)
display.Display()
x += deltaX
y += deltaY
if x == 0 || x == 127 {
deltaX = -deltaX
}
if y == 0 || y == 63 {
deltaY = -deltaY
}
time.Sleep(1 * time.Millisecond)
}
}
examples/ssd1306/main.go
+59
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@@ -0,0 +1,59 @@
package main
// This example shows how to use SSD1306 OLED display driver over I2C and SPI.
//
// Check the `newSSD1306Display()` functions for I2C and SPI initializations.
import (
"runtime"
"image/color"
"time"
)
func main() {
display := newSSD1306Display()
display.ClearDisplay()
w, h := display.Size()
x := int16(0)
y := int16(0)
deltaX := int16(1)
deltaY := int16(1)
traceTime := time.Now().UnixMilli() + 1000
frames := 0
ms := runtime.MemStats{}
for {
pixel := display.GetPixel(x, y)
c := color.RGBA{255, 255, 255, 255}
if pixel {
c = color.RGBA{0, 0, 0, 255}
}
display.SetPixel(x, y, c)
display.Display()
x += deltaX
y += deltaY
if x == 0 || x == w-1 {
deltaX = -deltaX
}
if y == 0 || y == h-1 {
deltaY = -deltaY
}
frames++
now := time.Now().UnixMilli()
if now >= traceTime {
runtime.ReadMemStats(&ms)
println("TS", now, "| FPS", frames, "| HeapInuse", ms.HeapInuse)
traceTime = now + 1000
frames = 0
}
}
}
examples/ssd1306/main_i2c_xiao-ble.go
+38
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@@ -0,0 +1,38 @@
//go:build xiao_ble
// This initializes SSD1306 OLED display driver over I2C.
//
// Seeed XIAO BLE board + SSD1306 128x32 I2C OLED display.
//
// Wiring:
// - XIAO GND -> OLED GND
// - XIAO 3v3 -> OLED VCC
// - XIAO D4 (SDA) -> OLED SDA
// - XIAO D5 (SCL) -> OLED SCK
//
// For your case:
// - Connect the display to I2C pins on your board.
// - Adjust I2C address and display size as needed.
package main
import (
"machine"
"tinygo.org/x/drivers/ssd1306"
)
func newSSD1306Display() *ssd1306.Device {
machine.I2C0.Configure(machine.I2CConfig{
Frequency: 400 * machine.KHz,
SDA: machine.SDA0_PIN,
SCL: machine.SCL0_PIN,
})
display := ssd1306.NewI2C(machine.I2C0)
display.Configure(ssd1306.Config{
Address: ssd1306.Address_128_32, // or ssd1306.Address
Width: 128,
Height: 32, // or 64
})
return display
}
examples/ssd1306/main_spi_thumby.go
+27
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@@ -0,0 +1,27 @@
//go:build thumby
// This initializes SSD1306 OLED display driver over SPI.
//
// Thumby board has a tiny built-in 72x40 display.
//
// As the display is built-in, no wiring is needed.
package main
import (
"machine"
"tinygo.org/x/drivers/ssd1306"
)
func newSSD1306Display() *ssd1306.Device {
machine.SPI0.Configure(machine.SPIConfig{})
display := ssd1306.NewSPI(machine.SPI0, machine.THUMBY_DC_PIN, machine.THUMBY_RESET_PIN, machine.THUMBY_CS_PIN)
display.Configure(ssd1306.Config{
Width: 72,
Height: 40,
ResetCol: ssd1306.ResetValue{28, 99},
ResetPage: ssd1306.ResetValue{0, 5},
})
return display
}
examples/ssd1306/main_spi_xiao-rp2040.go
+40
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@@ -0,0 +1,40 @@
//go:build xiao_rp2040
// This initializes SSD1306 OLED display driver over SPI.
//
// Seeed XIAO RP2040 board + SSD1306 128x64 SPI OLED display.
//
// Wiring:
// - XIAO GND -> OLED GND
// - XIAO 3v3 -> OLED VCC
// - XIAO D8 (SCK) -> OLED D0
// - XIAO D10 (SDO) -> OLED D1
// - XIAO D4 -> OLED RES
// - XIAO D5 -> OLED DC
// - XIAO D6 -> OLED CS
//
// For your case:
// - Connect the display to SPI pins on your board.
// - Adjust RES, DC and CS pins as needed.
// - Adjust SPI frequency as needed.
// - Adjust display size as needed.
package main
import (
"machine"
"tinygo.org/x/drivers/ssd1306"
)
func newSSD1306Display() *ssd1306.Device {
machine.SPI0.Configure(machine.SPIConfig{
Frequency: 50 * machine.MHz,
})
display := ssd1306.NewSPI(machine.SPI0, machine.D5, machine.D4, machine.D6)
display.Configure(ssd1306.Config{
Width: 128,
Height: 64,
})
return display
}
examples/ssd1306/spi_128x64/main.go
-48
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@@ -1,48 +0,0 @@
package main
import (
"image/color"
"machine"
"time"
"tinygo.org/x/drivers/ssd1306"
)
func main() {
machine.SPI0.Configure(machine.SPIConfig{
Frequency: 8000000,
})
display := ssd1306.NewSPI(machine.SPI0, machine.P8, machine.P7, machine.P9)
display.Configure(ssd1306.Config{
Width: 128,
Height: 64,
})
display.ClearDisplay()
x := int16(64)
y := int16(32)
deltaX := int16(1)
deltaY := int16(1)
for {
pixel := display.GetPixel(x, y)
c := color.RGBA{255, 255, 255, 255}
if pixel {
c = color.RGBA{0, 0, 0, 255}
}
display.SetPixel(x, y, c)
display.Display()
x += deltaX
y += deltaY
if x == 0 || x == 127 {
deltaX = -deltaX
}
if y == 0 || y == 63 {
deltaY = -deltaY
}
time.Sleep(1 * time.Millisecond)
}
}
examples/ssd1306/spi_thumby/main.go
-50
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@@ -1,50 +0,0 @@
// This example using the SSD1306 OLED display over SPI on the Thumby board
// A very tiny 72x40 display.
package main
import (
"image/color"
"machine"
"time"
"tinygo.org/x/drivers/ssd1306"
)
func main() {
machine.SPI0.Configure(machine.SPIConfig{})
display := ssd1306.NewSPI(machine.SPI0, machine.THUMBY_DC_PIN, machine.THUMBY_RESET_PIN, machine.THUMBY_CS_PIN)
display.Configure(ssd1306.Config{
Width: 72,
Height: 40,
ResetCol: ssd1306.ResetValue{28, 99},
ResetPage: ssd1306.ResetValue{0, 5},
})
display.ClearDisplay()
x := int16(36)
y := int16(20)
deltaX := int16(1)
deltaY := int16(1)
for {
pixel := display.GetPixel(x, y)
c := color.RGBA{255, 255, 255, 255}
if pixel {
c = color.RGBA{0, 0, 0, 255}
}
display.SetPixel(x, y, c)
display.Display()
x += deltaX
y += deltaY
if x == 0 || x == 71 {
deltaX = -deltaX
}
if y == 0 || y == 39 {
deltaY = -deltaY
}
time.Sleep(1 * time.Millisecond)
}
}