Fixed data corruption issue due to incorrect PROGMEM usage
Added switchable shift register order Added potentiometer-controlled delay for demonstration purposes
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2e1cb6e054
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4c16260e55
@ -4,26 +4,36 @@ SegmentDisplay* display;
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void setup()
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{
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pinMode(A3, INPUT);
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display = new SegmentDisplay();
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//display->setClockSpeed(4000000UL);
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display->setDigits(2);
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display->setClockPin(12);
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display->setDataPin(11);
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display->setLatchPin(10);
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display->setDigits(6);
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display->begin();
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}
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unsigned long currentTime;
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unsigned long lastCounterTime = 0;
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uint32_t counter = 0;
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uint32_t delayValue;
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void loop()
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{
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unsigned long currentTime = millis();
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currentTime = millis();
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if (currentTime - lastCounterTime > 1000UL)
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if (currentTime - lastCounterTime > 100UL)
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{
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counter++;
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if (counter > 99)
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if (counter > 999999)
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counter = 0;
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lastCounterTime = currentTime;
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delayValue = ((uint32_t)analogRead(A3) * 100);
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display->setDigitDelayMicroseconds(delayValue);
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}
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display->writeNumber(counter);
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@ -1,10 +1,12 @@
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#include "SegmentDisplayConfig.h"
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#include "SegmentDisplay.h"
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void SegmentDisplay::begin()
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{
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#if !defined(SDSupportSPI)
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pinMode(latchPin, OUTPUT);
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#if !defined(SDUseSPI)
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pinMode(clockPin, OUTPUT);
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pinMode(dataPin, OUTPUT);
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@ -12,11 +14,13 @@ void SegmentDisplay::begin()
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digitalWrite(dataPin, LOW);
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#endif
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writeDisplay(0, 0);
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digitalWrite(latchPin, HIGH);
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digitalWrite(latchPin, LOW);
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digitalWrite(latchPin, HIGH);
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#if defined(SDSupportSPI)
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#if defined(SDUseSPI)
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SPI.begin();
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#endif
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}
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@ -24,7 +28,7 @@ void SegmentDisplay::begin()
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void SegmentDisplay::end()
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{
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#if defined(SDSupportSPI)
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#if defined(SDUseSPI)
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SPI.end();
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#endif
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}
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@ -64,15 +68,15 @@ void SegmentDisplay::writeText(char* value)
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// Lowercase
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if (charValue >= ASCIILowercaseA && charValue <= ASCIILowercaseZ)
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writeDisplay(SDCharacterSegments[charValue - ASCIILowercaseA], digitMask);
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writeDisplay(pgm_read_byte_near(SDCharacterSegments + (charValue - ASCIILowercaseA)), digitMask);
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// Uppercase
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else if (charValue >= ASCIIUppercaseA && charValue <= ASCIIUppercaseZ)
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writeDisplay(SDCharacterSegments[charValue - ASCIIUppercaseA], digitMask);
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writeDisplay(pgm_read_byte_near(SDCharacterSegments + (charValue - ASCIIUppercaseA)), digitMask);
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// Numbers
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else if (charValue >= ASCIIZero && charValue <= ASCIINine)
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writeDisplay(SDNumberSegments[charValue - ASCIIZero], digitMask);
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writeDisplay(pgm_read_byte_near(SDNumberSegments + (charValue - ASCIIZero)), digitMask);
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// Space / unknown
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else
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@ -95,29 +99,43 @@ void SegmentDisplay::writeText(char* value)
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inline void SegmentDisplay::writeDigit(byte value, byte digitMask)
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{
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writeDisplay(SDNumberSegments[value], digitMask);
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delayMicroseconds(digitDelayMicroseconds);
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writeDisplay(pgm_read_byte_near(SDNumberSegments + value), digitMask);
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if (digitDelayMicroseconds > 1000)
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delay(digitDelayMicroseconds / 1000);
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else
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delayMicroseconds(digitDelayMicroseconds);
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}
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#if defined(SDSupportSPI)
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#if defined(SDUseSPI)
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inline void SegmentDisplay::writeDisplay(byte characterMask, byte digitMask)
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inline void SegmentDisplay::writeDisplay(byte segmentMask, byte digitMask)
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{
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SPI.beginTransaction(SPISettings(clockSpeed, MSBFIRST, SPI_MODE0));
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SPI.transfer(characterMask);
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#if defined(SDPushSegmentsFirst)
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SPI.transfer(segmentMask);
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SPI.transfer(digitMask);
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#else
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SPI.transfer(digitMask);
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SPI.transfer(segmentMask);
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#endif
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SPI.endTransaction();
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}
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#else
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inline void SegmentDisplay::writeDisplay(byte characterMask, byte digitMask)
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inline void SegmentDisplay::writeDisplay(byte segmentMask, byte digitMask)
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{
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digitalWrite(latchPin, LOW);
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shiftOut(dataPin, clockPin, MSBFIRST, characterMask);
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#if defined(SDPushSegmentsFirst)
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shiftOut(dataPin, clockPin, MSBFIRST, segmentMask);
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shiftOut(dataPin, clockPin, MSBFIRST, digitMask);
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#else
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shiftOut(dataPin, clockPin, MSBFIRST, digitMask);
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shiftOut(dataPin, clockPin, MSBFIRST, segmentMask);
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#endif
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digitalWrite(latchPin, HIGH);
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}
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@ -1,28 +1,27 @@
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#ifndef SegmentDisplay_h
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#define SegmentDisplay_h
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#include "SegmentDisplayConfig.h"
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#include "Arduino.h"
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#if defined(SDUseSPI)
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#include "SPI.h"
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#endif
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#include "SegmentDisplayChars.h"
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/**
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* Drives up to 8 digits using two 8-bit shift registers.
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*
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* Pushes out the segment bits first and the display selection
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* second: connect the display select register first and chain the
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* segment register to it's output.
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* Least significant bit ends up at output pin 0 of the shift register,
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* which correlates to Segment A (as defined in SegmentDisplayChars.h).
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* The last digit is also assumed to be at output pin 0 of the chained
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* shift register.
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*
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* Least significant bit ends up at pin 0, which correlates to
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* (as defined in SegmentDisplayChars.h):
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* - Last digit
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* - Segment A
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* The order in which the shift registers are chained is determined by
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* (un)defining SDPushSegmentsFirst.
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**/
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// Comment to use shiftOut. Set clockPin and dataPin instead.
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//#define SDSupportSPI
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class SegmentDisplay
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{
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public:
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@ -41,12 +40,12 @@ class SegmentDisplay
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uint32_t getDigitDelayMicroseconds() { return digitDelayMicroseconds; }
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void setDigitDelayMicroseconds(uint32_t value) { digitDelayMicroseconds = value; }
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#if defined(SDSupportSPI)
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#if defined(SDUseSPI)
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uint32_t getClockSpeed() { return clockSpeed; }
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void setClockSpeed(uint32_t value) { clockSpeed = value; }
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#endif
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#if !defined(SDSupportSPI)
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#if !defined(SDUseSPI)
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uint32_t getClockPin() { return clockPin; }
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void setClockPin(uint32_t value) { clockPin = value; }
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@ -63,11 +62,11 @@ class SegmentDisplay
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uint32_t digitDelayMicroseconds = 1000;
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uint32_t latchPin = SS;
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#if defined(SDSupportSPI)
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#if defined(SDUseSPI)
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uint32_t clockSpeed = 20000000;
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#endif
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#if !defined(SDSupportSPI)
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#if !defined(SDUseSPI)
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uint32_t clockPin = SCK;
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uint32_t dataPin = MOSI;
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#endif
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26
SegmentDisplayConfig.h
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26
SegmentDisplayConfig.h
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@ -0,0 +1,26 @@
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#ifndef SegmentDisplayConfig_h
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#define SegmentDisplayConfig_h
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/**
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* Enable SPI support
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*
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* If not defined, shiftOut will be used. Use setClockPin and
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* setDataPin instead to change the defaults.
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*
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* When using SPI, use setClockSpeed to match your target.
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**/
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//#define SDUseSPI
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/**
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* Shift register chaining order
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*
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* If defined, the segment mask is pushed out first followed
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* by the digit mask. In other words, connect D1, D2, etc to
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* the first shift register and A, B, etc to the second.
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*
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* If not defined, the order is reversed.
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**/
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//#define SDPushSegmentsFirst
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#endif
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@ -1,4 +1,6 @@
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Top view
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D1 A F D2 D3 B
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__|__|__|__|__|__|__
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@ -11,6 +13,22 @@
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E D DP C G
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Bottom view
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B D3 D2 F A D1
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__|__|__|__|__|__|__
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|_____ __ __ __ __ __|
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G C DP D E
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Pin Assignment
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1 E Bottom Left
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33
reference/UDN2981A - 8-Channel Source Driver.txt
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33
reference/UDN2981A - 8-Channel Source Driver.txt
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@ -0,0 +1,33 @@
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O1 O2 O3 O4 O5 O6 O7 O8 GND
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__|____|____|____|____|____|____|____|____|__
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|/ |
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|__ ____ ____ ____ ____ ____ ____ ____ ____ __|
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I1 I2 I3 I4 I5 I6 I7 I8 VCC
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Pin Assignment
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1 I1
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2 I2
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3 I3
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4 I4
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5 I5
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6 I6
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7 I7
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8 I8
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9 VCC
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10 GND Ground
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11 O8
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12 O7
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13 O6
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14 O5
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15 O4
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16 O3
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17 O2
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18 O1
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