mirror of
https://github.com/RobTillaart/Arduino.git
synced 2024-10-03 18:09:02 -04:00
113 lines
2.1 KiB
C++
113 lines
2.1 KiB
C++
//
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// FILE: I2CKeyPad_demo03.ino
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// AUTHOR: Rob Tillaart
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// PURPOSE: demo reading a larger value from the keyPad
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// URL: https://github.com/RobTillaart/I2CKeyPad
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//
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// PCF8574
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// pin p0-p3 rows
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// pin p4-p7 columns
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// 4x4 or smaller keypad.
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#include "Wire.h"
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#include "I2CKeyPad.h"
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const uint8_t KEYPAD_ADDRESS = 0x38;
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I2CKeyPad keyPad(KEYPAD_ADDRESS);
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uint32_t start, stop;
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uint32_t lastKeyPressed = 0;
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uint32_t value = 0;
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void setup()
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{
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Serial.begin(115200);
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Serial.println(__FILE__);
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Wire.begin();
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Wire.setClock(400000);
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if (keyPad.begin() == false)
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{
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Serial.println("\nERROR: cannot communicate to keypad.\nPlease reboot.\n");
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while(1);
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}
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}
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void loop()
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{
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uint32_t now = millis();
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if (now - lastKeyPressed >= 100)
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{
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lastKeyPressed = now;
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start = micros();
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char c = handleKeyPadValue(value);
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if (value > 125000) value = 125000; // some sample max.
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stop = micros();
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Serial.print(millis());
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Serial.print("\t");
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Serial.print(value);
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Serial.print("\t");
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Serial.print((char) c);
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Serial.print("\t");
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Serial.println(stop - start);
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}
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}
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// handleKeyPadValue is used to read a uint32_t from the keypad
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// every digit must be pressed separately
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// the last key pressed is also returned.
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//
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// 0..9 adds to the number
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// * means remove last digit
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// # resets to zero
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// ABCD are not mapped.
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char handleKeyPadValue(uint32_t &value)
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{
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char v[19] = "123A456B789C*0#DNF"; // N = NoKey, F = Fail
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static uint8_t lastKey = 0;
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uint8_t idx = keyPad.getKey();
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char c = v[idx];
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if (lastKey != c)
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{
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lastKey = c;
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switch (c)
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{
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case '0' ... '9':
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value *= 10;
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value += c - '0';
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break;
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case '*':
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if (value > 0) value /= 10;
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break;
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case '#':
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value = 0;
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break;
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case 'A' ... 'D':
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// e.g. store value in EEPROM
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break;
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case 'F':
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Serial.println("FAIL");
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break;
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case 'N':
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Serial.println("NOKEY");
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break;
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default:
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break;
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}
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}
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return c;
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}
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// -- END OF FILE --
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