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main.go
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main.go
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package main
import (
"machine"
"time"
"tinygo.org/x/drivers/max72xx"
)
// example for a 4 digit 7 segment display
func main() {
// Pins for Arduino Nano 33 IOT
err := machine.SPI0.Configure(machine.SPIConfig{
SDO: machine.D11, // default SDO pin
SCK: machine.D13, // default sck pin
LSBFirst: false,
Frequency: 10000000,
})
if err != nil {
println(err.Error())
}
driver := max72xx.NewDevice(machine.SPI0, machine.D6)
driver.Configure()
digitNumber := 4
driver.StopDisplayTest()
driver.SetDecodeMode(4)
driver.SetScanLimit(4)
driver.SetIntensity(8)
driver.StopShutdownMode()
for i := 1; i < int(digitNumber); i++ {
driver.WriteCommand(byte(i), byte(Blank))
}
for {
for _, character := range characters {
println("writing", "characterValue:", character.String())
driver.WriteCommand(byte(4), byte(character))
driver.WriteCommand(byte(3), byte(character))
driver.WriteCommand(byte(2), byte(character))
driver.WriteCommand(byte(1), byte(character))
time.Sleep(500 * time.Millisecond)
}
time.Sleep(time.Second)
}
}
var characters = []Character{
Zero,
One,
Two,
Three,
Four,
Five,
Six,
Seven,
Eight,
Nine,
Dash,
E,
H,
L,
P,
Blank,
Dot,
}
// Each bit translates to a pin, which is driven high or low
type Character byte
func (char Character) String() string {
switch char {
case Zero:
return "0"
case One:
return "1"
case Two:
return "2"
case Three:
return "3"
case Four:
return "4"
case Five:
return "5"
case Six:
return "6"
case Seven:
return "7"
case Eight:
return "8"
case Nine:
return "9"
case Dash:
return "-"
case E:
return "E"
case H:
return "H"
case L:
return "L"
case P:
return "P"
case Blank:
return ""
case Dot:
return "."
}
return ""
}
const (
Zero Character = 0 //126
One Character = 1 //48
Two Character = 2 // 109
Three Character = 3 // 121
Four Character = 4
Five Character = 5
Six Character = 6
Seven Character = 7
Eight Character = 8
Nine Character = 9
Dash Character = 10
E Character = 11
H Character = 12
L Character = 13
P Character = 14
Blank Character = 15
Dot Character = 128
)