Updated for more display types. Fixed memoryaddress confusion in address() method. Added new getAddress() method. Added support for UDCs, Backlight control and other features such as control through I2C and SPI port expanders and controllers with native I2C and SPI interfaces. Refactored to fix issue with pins that are default declared as NC.
Dependents: GPSDevice TestTextLCD SD to Flash Data Transfer DrumMachine ... more
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Example
Hello World! for the TextLCD
#include "mbed.h" #include "TextLCD.h" // Host PC Communication channels Serial pc(USBTX, USBRX); // tx, rx // I2C Communication I2C i2c_lcd(p28,p27); // SDA, SCL // SPI Communication SPI spi_lcd(p5, NC, p7); // MOSI, MISO, SCLK //TextLCD lcd(p15, p16, p17, p18, p19, p20); // RS, E, D4-D7, LCDType=LCD16x2, BL=NC, E2=NC, LCDTCtrl=HD44780 //TextLCD_SPI lcd(&spi_lcd, p8, TextLCD::LCD40x4); // SPI bus, 74595 expander, CS pin, LCD Type TextLCD_I2C lcd(&i2c_lcd, 0x42, TextLCD::LCD20x4); // I2C bus, PCF8574 Slaveaddress, LCD Type //TextLCD_I2C lcd(&i2c_lcd, 0x42, TextLCD::LCD16x2, TextLCD::WS0010); // I2C bus, PCF8574 Slaveaddress, LCD Type, Device Type //TextLCD_SPI_N lcd(&spi_lcd, p8, p9); // SPI bus, CS pin, RS pin, LCDType=LCD16x2, BL=NC, LCDTCtrl=ST7032_3V3 //TextLCD_I2C_N lcd(&i2c_lcd, ST7032_SA, TextLCD::LCD16x2, NC, TextLCD::ST7032_3V3); // I2C bus, Slaveaddress, LCD Type, BL=NC, LCDTCtrl=ST7032_3V3 int main() { pc.printf("LCD Test. Columns=%d, Rows=%d\n\r", lcd.columns(), lcd.rows()); for (int row=0; row<lcd.rows(); row++) { int col=0; pc.printf("MemAddr(Col=%d, Row=%d)=0x%02X\n\r", col, row, lcd.getAddress(col, row)); // lcd.putc('-'); lcd.putc('0' + row); for (col=1; col<lcd.columns()-1; col++) { lcd.putc('*'); } pc.printf("MemAddr(Col=%d, Row=%d)=0x%02X\n\r", col, row, lcd.getAddress(col, row)); lcd.putc('+'); } // Show cursor as blinking character lcd.setCursor(TextLCD::CurOff_BlkOn); // Set and show user defined characters. A maximum of 8 UDCs are supported by the HD44780. // They are defined by a 5x7 bitpattern. lcd.setUDC(0, (char *) udc_0); // Show |> lcd.putc(0); lcd.setUDC(1, (char *) udc_1); // Show <| lcd.putc(1); }
Handbook page
More info is here
Diff: TextLCD.h
- Revision:
- 11:9ec02df863a1
- Parent:
- 10:dd9b3a696acd
- Child:
- 12:6bf9d9957d31
--- a/TextLCD.h Mon Feb 04 21:48:24 2013 +0000 +++ b/TextLCD.h Tue Feb 05 21:03:43 2013 +0000 @@ -34,7 +34,7 @@ * #include "mbed.h" * #include "TextLCD.h" * - * TextLCD lcd(p10, p12, p15, p16, p29, p30); // rs, e, d4-d7 + * TextLCD lcd(p15, p16, p17, p18, p19, p20); // RS, E, D4-D7 * * int main() { * lcd.printf("Hello World!\n"); @@ -42,7 +42,29 @@ * @endcode */ - +/** User Defined Chars 5x7 dots */ +const char udc_ae[] = {0x00, 0x00, 0x1B, 0x05, 0x1F, 0x14, 0x1F, 0x00}; //æ +const char udc_0e[] = {0x00, 0x00, 0x0E, 0x13, 0x15, 0x19, 0x0E, 0x00}; //ø +const char udc_ao[] = {0x0E, 0x0A, 0x0E, 0x01, 0x0F, 0x11, 0x0F, 0x00}; //å +const char udc_AE[] = {0x0F, 0x14, 0x14, 0x1F, 0x14, 0x14, 0x17, 0x00}; //Æ +const char udc_0E[] = {0x0E, 0x13, 0x15, 0x15, 0x15, 0x19, 0x0E, 0x00}; //Ø +const char udc_AA[] = {0x0E, 0x0A, 0x0E, 0x11, 0x1F, 0x11, 0x11, 0x00}; //Å + +const char udc_0[] = {0x18, 0x14, 0x12, 0x11, 0x12, 0x14, 0x18, 0x00}; // |> +const char udc_1[] = {0x03, 0x05, 0x09, 0x11, 0x09, 0x05, 0x03, 0x00}; // <| +const char udc_2[] = {0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x00}; // | +const char udc_3[] = {0x14, 0x14, 0x14, 0x14, 0x14, 0x14, 0x14, 0x00}; // || +const char udc_4[] = {0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x15, 0x00}; // ||| +const char udc_5[] = {0x00, 0x1f, 0x00, 0x1f, 0x00, 0x1f, 0x00, 0x00}; // = +const char udc_6[] = {0x15, 0x0a, 0x15, 0x0a, 0x15, 0x0a, 0x15, 0x00}; // checkerboard +const char udc_7[] = {0x10, 0x08, 0x04, 0x02, 0x01, 0x00, 0x10, 0x00}; // \ + + +/** A TextLCD interface for driving 4-bit HD44780-based LCDs + * + * Currently supports 8x1, 8x2, 16x2, 16x4, 20x2, 20x4, 24x2, 24x4 and 40x2 panels + * + */ class TextLCD : public Stream { public: @@ -62,8 +84,10 @@ /** LCD Cursor control */ enum LCDCursor { - CurOn, - CurOff + CurOff_BlkOff, + CurOn_BlkOff, + CurOff_BlkOn, + CurOn_BlkOn, }; @@ -115,12 +139,6 @@ */ void setAddress(int column, int row); - /** Set the Cursormode - * - * @param show The Cursor mode (CurOn or CurOff) - * @param return The current Cursor mode - */ - LCDCursor cursor(LCDCursor show); /** Clear the screen and locate to 0,0 */ void cls(); @@ -137,6 +155,20 @@ */ int columns(); + /** Set the Cursormode + * + * @param show The Cursor mode (CurOff_BlkOff, CurOn_BlkOff, CurOff_BlkOn, CurOn_BlkOn) + */ + void cursor(LCDCursor show); + + + /** Set User Defined Characters + * + * @param unsigned char c The Index of the UDC (0..7) + * @param char *udc_char The bitpatterns for the UDC (8 bytes of 5 significant bits) + */ + void setUDC(unsigned char c, char *udc_data); + protected: // Stream implementation functions virtual int _putc(int value);