7 Segment LED Displaydriver, I2C interface, SAA1064
SAA1064.cpp
- Committer:
- wim
- Date:
- 2013-09-08
- Revision:
- 0:48adc4a70511
- Child:
- 1:79cb73f852da
File content as of revision 0:48adc4a70511:
/* SAA1064 - I2C LED Driver used in multiplex mode (4x 7 Segments and Decimal Point) * Copyright (c) 2013 Wim Huiskamp * * Released under the MIT License: http://mbed.org/license/mit * * version 0.2 Initial Release */ #include "mbed.h" #include "SAA1064.h" /** Create an SAA1064 object connected to the specified I2C object and using the specified deviceAddress * * @param I2C &i2c the I2C port to connect to * @param char deviceAddress the address of the SAA1064 */ SAA1064::SAA1064(I2C *i2c, char deviceAddress) : _i2c(i2c) { _slaveAddress = deviceAddress; _init(); }; char SAA1064::read() { char tmp = 0; return tmp; }; void SAA1064::write(char byte) { }; void SAA1064::setIntensity(unsigned char intensity) { char data[6]; intensity = (intensity & 0x07) << 4; // Valid Range between 0-7 // 0 = 0 mA/segment, 1 = 3 mA/segment etc data[0] = SAA1064_CTRL; // Select Control Reg data[1] = SAA1064_CTRL_DEF | intensity; // Init Control Reg // write data to the display _i2c->write(_slaveAddress, data, 2); }; void SAA1064::write(unsigned char digit1, unsigned char digit2, unsigned char digit3, unsigned char digit4) { char data[6]; data[0] = SAA1064_DIG1; // Select Digit1 Reg data[1] = digit1; // Digit 1 data[2] = digit2; // Digit 2 data[3] = digit3; // Digit 3 data[4] = digit4; // Digit 4 // write data to the display _i2c->write(_slaveAddress, data, 5); }; void SAA1064::writeInt(int value, unsigned char dp_digit, bool leading) { unsigned char digit_value; char data[6]; data[0] = SAA1064_DIG1; // Select Digit1 Reg // limit to valid range if (value >= 9999) value = 9999; if (value <= -999) value = -999; if (value >= 0) { // value 0...9999 digit_value = value/1000; // compute thousands value = value % 1000; // compute remainder if ((digit_value==0)&& leading) data[1] = SAA1064_BLNK; // suppress leading zero else { data[1] = SAA1064_SEGM[digit_value]; leading = false; // dont suppress zero's } if (dp_digit==1) {data[1] |= SAA1064_DP;} // Set decimal point digit_value = value/100; // compute hundreds value = value % 100; // compute remainder if ((digit_value==0) && leading) data[2] = SAA1064_BLNK; // suppress leading zero else { data[2] = SAA1064_SEGM[digit_value]; leading = false; // dont suppress zero's } if (dp_digit==2) {data[2] |= SAA1064_DP;} // Set decimal point digit_value = value/10; // compute tens value = value % 10; // compute remainder if ((digit_value==0) && leading) data[3] = SAA1064_BLNK; // suppress leading zero else { data[3] = SAA1064_SEGM[digit_value]; //leading = false; // dont suppress zero's } if (dp_digit==3) {data[3] |= SAA1064_DP;} // Set decimal point //digit_value = value; // compute units data[4] = SAA1064_SEGM[value]; // never suppress units zero if (dp_digit==4) {data[4] |= SAA1064_DP;} // Set decimal point } else { // value -999...-1 value = -value; data[1] = SAA1064_MINUS; // Sign if (dp_digit==1) {data[1] |= SAA1064_DP;} // Set decimal point digit_value = value/100; // compute hundreds value = value % 100; // compute remainder if ((digit_value==0) && leading) data[2] = SAA1064_BLNK; // suppress leading zero else { data[2] = SAA1064_SEGM[digit_value]; leading = false; // dont suppress zero's } if (dp_digit==2) {data[2] |= SAA1064_DP;} // Set decimal point digit_value = value/10; // compute tens value = value % 10; // compute remainder if ((digit_value==0) && leading) data[3] = SAA1064_BLNK; // suppress leading zero else { data[3] = SAA1064_SEGM[digit_value]; //leading = false; // dont suppress zero's } if (dp_digit==3) {data[3] |= SAA1064_DP;} // Set decimal point //digit_value = value; // compute units data[4] = SAA1064_SEGM[value]; // never suppress units zero if (dp_digit==4) {data[4] |= SAA1064_DP;} // Set decimal point } // write data to the display _i2c->write(_slaveAddress, data, 5); }; void SAA1064::_init() { char data[6]; data[0] = SAA1064_CTRL; // Select Control Reg data[1] = SAA1064_CTRL_DEF | SAA1064_INT3; // Init Control Reg data[2] = SAA1064_BLNK; // Digit 1: All Segments Off data[3] = SAA1064_BLNK; // Digit 2: All Segments Off data[4] = SAA1064_BLNK; // Digit 3: All Segments Off data[5] = SAA1064_BLNK; // Digit 4: All Segments Off // data[2] = SAA1064_ALL; // Digit 1: All Segments On // data[3] = SAA1064_ALL; // Digit 2: All Segments On // data[4] = SAA1064_ALL; // Digit 3: All Segments On // data[5] = SAA1064_ALL; // Digit 4: All Segments On // write data to the display _i2c->write(_slaveAddress, data, 6); };