7 Segment LED Displaydriver, I2C interface, SAA1064
Diff: SAA1064.cpp
- Revision:
- 0:48adc4a70511
- Child:
- 1:79cb73f852da
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SAA1064.cpp Sun Sep 08 22:23:52 2013 +0000 @@ -0,0 +1,165 @@ +/* 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); + +};