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deadprogram
92 lines
2.6 KiB
Go
92 lines
2.6 KiB
Go
// 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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"tinygo.org/x/drivers"
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)
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type Device struct {
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bus drivers.SPI
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cs drivers.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 drivers.SPI, cs drivers.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 expects that the pin of the Device has already been configured by the user as output.
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func (driver *Device) Configure() {
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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(REG_SCANLIMIT, digitNumber-1)
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}
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// SetIntensity sets the intensity of the diplays.
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// There are 16 possible intensity levels. The valid range is 0x00-0x0F
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func (driver *Device) SetIntensity(intensity uint8) {
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if intensity > 0x0F {
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intensity = 0x0F
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}
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driver.WriteCommand(REG_INTENSITY, intensity)
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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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