Wim De Roeve
Diff: I2CTextLCD.h
- Revision:
- 2:1c5dea5d8783
- Parent:
- 1:0eb3365ec819
- Child:
- 3:704f87be7993
--- a/I2CTextLCD.h Sun Dec 19 19:19:39 2010 +0000
+++ b/I2CTextLCD.h Thu Dec 23 12:42:37 2010 +0000
@@ -10,28 +10,9 @@
#include "mbed.h"
#include "Stream.h"
-/* The code assumes the following connections between the PCF8575
-* and the LCD
-*
-* nc - D0
-* nc - D1
-* nc - D2
-* nc - D3
-* P0 - D4
-* P1 - D5
-* P2 - D6
-* P3 - D7
-* P4 - E
-* P5 - nc
-* P6 - nc
-* P7 - RS
-* gnd - R/W
-
-*/
-
-#define E_ON 0x10 //P4
+#define E_ON 0x10 //P4
#define BACKLIGHT_ON 0x20 //P5
-#define RS_ON 0x80 //P7
+#define RS_ON 0x80 //P7
namespace mbed {
@@ -42,7 +23,7 @@
* turned in to a more generic libray.
*
* If you are connecting multiple displays, you can connect them all in
- * parallel except for the enable (e) pin, which must be unique for each
+ * parallel, the address of the PCF8575 or PCF8574 must be unique for each
* display.
*
* Example:
@@ -59,18 +40,25 @@
public:
/* Constructor: I2CTextLCD
- * Create a I2CTextLCD object, connected to the specified pins
+ * Create a I2CTextLCD object
*
- * All signals must be connected to DigitalIn compatible pins.
+ * wiring
*
- * Variables:
- * rs - Used to specify data or command
- * rw - Used to determine read or write
- * e - enable
- * d0..d3 - The data lines
+ * PCF8575/PCF8574 to LCD
+ * ----------------------
+ * P0 - D4
+ * P1 - D5
+ * P2 - D6
+ * P3 - D7
+ * P4 - E
+ * P5 - backlight (connected to a relay)
+ * P6 - nc
+ * P7 - RS
+ * gnd - R/W
+ *
*/
- I2CTextLCD(PinName sda, PinName scl, int address, int columns = 16, int rows = 2);
+ I2CTextLCD(PinName sda, PinName scl, int address, int columns = 16, int rows = 2, bool backlight = true);
#if 0 // Inhereted from Stream, for documentation only
/* Function: putc
@@ -106,6 +94,13 @@
virtual void cls();
virtual void reset();
+
+ /* Function: backlight
+ * Sets the backlight on or off
+ *
+ * Variables:
+ * on (true or false)
+ */
virtual void backlight(bool on);
protected:
@@ -129,10 +124,11 @@
I2C _i2c;
int _i2cAddress;
bool _backlight;
-
+
+
private:
-
+
};