Wim Huiskamp
7 Segment LED Displaydriver, I2C interface, SAA1064
Revision 0:48adc4a70511, committed 2013-09-08
- Comitter:
- wim
- Date:
- Sun Sep 08 22:23:52 2013 +0000
- Child:
- 1:79cb73f852da
- Commit message:
- SAA1064 test and LPC812 test
Changed in this revision
| SAA1064.cpp | Show annotated file Show diff for this revision Revisions of this file |
| SAA1064.h | Show annotated file Show diff for this revision Revisions of this file |
--- /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);
+
+};
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/SAA1064.h Sun Sep 08 22:23:52 2013 +0000
@@ -0,0 +1,103 @@
+/* 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
+*/
+#ifndef _SAA1064_H
+#define _SAA1064_H
+
+//Address Defines for SAA1064
+#define SAA1064_SA0 0x70
+#define SAA1064_SA1 0x72
+#define SAA1064_SA2 0x74
+#define SAA1064_SA3 0x76
+
+//Register Defines for SAA1064
+#define SAA1064_CTRL 0x00
+#define SAA1064_DIG1 0x01
+#define SAA1064_DIG2 0x02
+#define SAA1064_DIG3 0x03
+#define SAA1064_DIG4 0x04
+
+//Control Register Defines for SAA1064
+//Static display (2 digits) or Multiplexed (4 digits)
+#define SAA1064_MPX 0x01
+//Digits 1 and 2 On
+#define SAA1064_B0 0x02
+//Digits 3 and 4 On
+#define SAA1064_B1 0x04
+//Intensity of display
+#define SAA1064_INT0 0x00
+#define SAA1064_INT1 0x10
+#define SAA1064_INT2 0x20
+#define SAA1064_INT3 0x30
+#define SAA1064_INT4 0x40
+#define SAA1064_INT5 0x50
+#define SAA1064_INT6 0x60
+#define SAA1064_INT7 0x70
+
+//Default Mode: Multiplex On, All Digits On
+#define SAA1064_CTRL_DEF (SAA1064_MPX | SAA1064_B0 | SAA1064_B1)
+
+
+//Pin Defines for SAA1064
+#define D_L0 0x01
+#define D_L1 0x02
+#define D_L2 0x04
+#define D_L3 0x08
+#define D_L4 0x10
+#define D_L5 0x20
+#define D_L6 0x40
+#define D_L7 0x80
+
+//Defines for Segments
+const char SAA1064_SEGM[] = {0x3F, //0
+ 0x06, //1
+ 0x5B, //2
+ 0x4F, //3
+ 0x66, //4
+ 0x6D, //5
+ 0x7D, //6
+ 0x07, //7
+ 0x7F, //8
+ 0x6F, //9
+ 0x77, //A
+ 0x7C, //B
+ 0x39, //C
+ 0x5E, //D
+ 0x79, //E
+ 0x71}; //F
+
+#define SAA1064_DP 0x80 //Decimal Point
+#define SAA1064_MINUS 0x40 //Minus Sign
+#define SAA1064_BLNK 0x00 //Blank Digit
+#define SAA1064_ALL 0xFF //All Segments On
+
+
+/** 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
+*/
+class SAA1064 {
+public:
+ SAA1064(I2C *i2c, char deviceAddress = SAA1064_SA0);
+ char read();
+ void write(char byte);
+
+ void setIntensity(unsigned char intensity);
+
+ void write(unsigned char digit1, unsigned char digit2, unsigned char digit3, unsigned char digit4);
+
+ void writeInt(int value, unsigned char dp_digit=0, bool leading=true);
+
+protected:
+ I2C *_i2c;
+ unsigned char _slaveAddress;
+
+ void _init();
+};
+
+#endif
\ No newline at end of file
SAA1064 4 Digit 7-Segment LED driver with I2C interface