mirror of
https://github.com/tinygo-org/drivers.git
synced 2026-08-05 23:43:41 +00:00
max7219: add driver support
This commit is contained in:
Tobias Theel
committed by
deadprogram
deadprogram
parent
01acd977f3
commit
a771641339
Vendored
+6
@@ -0,0 +1,6 @@
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{
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"go.toolsEnvVars": {
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"GOROOT": "/home/tobias/.cache/tinygo/goroot-go1.16-65176e9981f9146086a1cca207bd1d47f4da8a15455d548a5d84fac12d1814d2-syscall",
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"GOFLAGS": "-tags=arduino_nano33,atsamd21g18a,atsamd21g18,atsamd21,sam,cortexm,baremetal,linux,arm,tinygo,gc.conservative,scheduler.tasks"
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}
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}
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@@ -165,11 +165,15 @@ endif
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@md5sum ./build/test.hex
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tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/lis2mdl/main.go
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@md5sum ./build/test.hex
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tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/max72xx/main.go
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@md5sum ./build/test.hex
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tinygo build -size short -o ./build/test.hex -target=feather-m0 ./examples/dht/main.go
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@md5sum ./build/test.hex
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DRIVERS = $(wildcard */)
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NOTESTS = build examples flash semihosting pcd8544 shiftregister st7789 microphone mcp3008 gps microbitmatrix \
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hcsr04 ssd1331 ws2812 thermistor apa102 easystepper ssd1351 ili9341 wifinina shifter hub75 \
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hd44780 buzzer ssd1306 espat l9110x st7735 bmi160 l293x
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hd44780 buzzer ssd1306 espat l9110x st7735 bmi160 l293x max72xx
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TESTS = $(filter-out $(addsuffix /%,$(NOTESTS)),$(DRIVERS))
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unit-test:
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@@ -52,7 +52,7 @@ func main() {
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## Currently supported devices
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The following 53 devices are supported.
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The following 54 devices are supported.
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| Device Name | Interface Type |
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|----------|-------------|
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@@ -84,6 +84,7 @@ The following 53 devices are supported.
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| [LIS3DH accelerometer](https://www.st.com/resource/en/datasheet/lis3dh.pdf) | I2C |
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| [LSM6DS3 accelerometer](https://www.st.com/resource/en/datasheet/lsm6ds3.pdf) | I2C |
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| [MAG3110 magnetometer](https://www.nxp.com/docs/en/data-sheet/MAG3110.pdf) | I2C |
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| [MAX7219 & MAX7221 display driver](https://datasheets.maximintegrated.com/en/ds/MAX7219-MAX7221.pdf) | SPI |
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| [MCP3008 analog to digital converter (ADC)](http://ww1.microchip.com/downloads/en/DeviceDoc/21295d.pdf) | SPI |
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| [Microphone - PDM](https://cdn-learn.adafruit.com/assets/assets/000/049/977/original/MP34DT01-M.pdf) | I2S/PDM |
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| [MMA8653 accelerometer](https://www.nxp.com/docs/en/data-sheet/MMA8653FC.pdf) | I2C |
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@@ -0,0 +1,135 @@
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package main
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import (
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"machine"
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"time"
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"tinygo.org/x/drivers/max72xx"
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)
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// example for a 4 digit 7 segment display
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func main() {
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// Pins for Arduino Nano 33 IOT
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err := machine.SPI0.Configure(machine.SPIConfig{
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SDO: machine.D11, // default SDO pin
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SCK: machine.D13, // default sck pin
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LSBFirst: false,
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Frequency: 10000000,
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})
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if err != nil {
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println(err.Error())
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}
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driver := max72xx.NewDevice(machine.SPI0, machine.D6)
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driver.Configure()
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digitNumber := 4
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driver.StopDisplayTest()
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driver.SetDecodeMode(4)
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driver.SetScanLimit(4)
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driver.StopShutdownMode()
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for i := 1; i < int(digitNumber); i++ {
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driver.WriteCommand(byte(i), byte(Blank))
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}
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for {
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for _, character := range characters {
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println("writing", "characterValue:", character.String())
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driver.WriteCommand(byte(4), byte(character))
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driver.WriteCommand(byte(3), byte(character))
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driver.WriteCommand(byte(2), byte(character))
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driver.WriteCommand(byte(1), byte(character))
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time.Sleep(500 * time.Millisecond)
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}
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time.Sleep(time.Second)
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}
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}
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var characters = []Character{
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Zero,
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One,
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Two,
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Three,
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Four,
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Five,
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Six,
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Seven,
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Eight,
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Nine,
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Dash,
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E,
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H,
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L,
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P,
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Blank,
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Dot,
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}
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// Each bit translates to a pin, which is driven high or low
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type Character byte
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func (char Character) String() string {
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switch char {
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case Zero:
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return "0"
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case One:
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return "1"
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case Two:
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return "2"
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case Three:
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return "3"
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case Four:
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return "4"
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case Five:
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return "5"
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case Six:
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return "6"
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case Seven:
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return "7"
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case Eight:
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return "8"
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case Nine:
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return "9"
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case Dash:
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return "-"
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case E:
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return "E"
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case H:
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return "H"
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case L:
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return "L"
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case P:
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return "P"
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case Blank:
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return ""
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case Dot:
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return "."
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}
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return ""
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}
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const (
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Zero Character = 0 //126
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One Character = 1 //48
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Two Character = 2 // 109
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Three Character = 3 // 121
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Four Character = 4
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Five Character = 5
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Six Character = 6
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Seven Character = 7
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Eight Character = 8
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Nine Character = 9
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Dash Character = 10
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E Character = 11
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H Character = 12
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L Character = 13
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P Character = 14
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Blank Character = 15
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Dot Character = 128
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)
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@@ -0,0 +1,85 @@
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// Driver works for max7219 and 7221
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// Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX7219-MAX7221.pdf
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package max72xx
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import (
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"machine"
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)
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type Device struct {
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bus machine.SPI
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cs machine.Pin
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}
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// NewDriver creates a new max7219 connection. The SPI wire must already be configured
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// The SPI frequency must not be higher than 10MHz.
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// parameter cs: the datasheet also refers to this pin as "load" pin.
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func NewDevice(bus machine.SPI, cs machine.Pin) *Device {
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return &Device{
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bus: bus,
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cs: cs,
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}
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}
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// Configure setups the pins.
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func (driver *Device) Configure() {
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outPutConfig := machine.PinConfig{Mode: machine.PinOutput}
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driver.cs.Configure(outPutConfig)
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}
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// SetScanLimit sets the scan limit. Maximum is 8.
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// Example: a 4 digit 7SegmentDisplay has a scan limit of 4
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func (driver *Device) SetScanLimit(digitNumber uint8) {
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driver.WriteCommand(byte(REG_SCANLIMIT), byte(digitNumber-1))
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}
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// SetDecodeMode sets the decode mode for 7 segment displays.
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// digitNumber = 1 -> 1 digit gets decoded
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// digitNumber = 2 or 3, or 4 -> 4 digit are being decoded
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// digitNumber = 8 -> 8 digits are being decoded
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// digitNumber 0 || digitNumber > 8 -> no decoding is being used
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func (driver *Device) SetDecodeMode(digitNumber uint8) {
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switch digitNumber {
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case 1: // only decode first digit
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driver.WriteCommand(REG_DECODE_MODE, 0x01)
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case 2, 3, 4: // decode digits 3-0
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driver.WriteCommand(REG_DECODE_MODE, 0x0F)
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case 8: // decode 8 digits
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driver.WriteCommand(REG_DECODE_MODE, 0xFF)
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default:
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driver.WriteCommand(REG_DECODE_MODE, 0x00)
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}
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}
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// StartShutdownMode sets the IC into a low power shutdown mode.
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func (driver *Device) StartShutdownMode() {
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driver.WriteCommand(REG_SHUTDOWN, 0x00)
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}
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// StartShutdownMode sets the IC into normal operation mode.
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func (driver *Device) StopShutdownMode() {
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driver.WriteCommand(REG_SHUTDOWN, 0x01)
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}
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// StartDisplayTest starts a display test.
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func (driver *Device) StartDisplayTest() {
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driver.WriteCommand(REG_DISPLAY_TEST, 0x01)
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}
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// StopDisplayTest stops the display test and gets into normal operation mode.
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func (driver *Device) StopDisplayTest() {
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driver.WriteCommand(REG_DISPLAY_TEST, 0x00)
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}
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func (driver *Device) writeByte(data byte) {
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driver.bus.Transfer(data)
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}
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// WriteCommand write data to a given register.
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func (driver *Device) WriteCommand(register, data byte) {
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driver.cs.Low()
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driver.writeByte(register)
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driver.writeByte(data)
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driver.cs.High()
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}
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@@ -0,0 +1,18 @@
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package max72xx
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const (
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REG_NOOP byte = 0x00
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REG_DIGIT0 byte = 0x01
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REG_DIGIT1 byte = 0x02
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REG_DIGIT2 byte = 0x03
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REG_DIGIT3 byte = 0x04
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REG_DIGIT4 byte = 0x05
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REG_DIGIT5 byte = 0x06
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REG_DIGIT6 byte = 0x07
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REG_DIGIT7 byte = 0x08
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REG_DECODE_MODE byte = 0x09 // turn of for led matrix, turn on for digits
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REG_INTENSITY byte = 0x0A
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REG_SCANLIMIT byte = 0x0B
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REG_SHUTDOWN byte = 0x0C // turn on for no shutdown mode
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REG_DISPLAY_TEST byte = 0x0F // turn off for no display test
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)
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