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
Revision 7:44f34c09bd37, committed 2010-12-04
- Comitter:
- simon
- Date:
- Sat Dec 04 11:29:57 2010 +0000
- Parent:
- 6:e4cb7ddee0d3
- Child:
- 8:03116f75b66e
- Commit message:
- Update pin names to d4-d7
Changed in this revision
TextLCD.cpp | Show annotated file Show diff for this revision Revisions of this file |
TextLCD.h | Show annotated file Show diff for this revision Revisions of this file |
--- a/TextLCD.cpp Tue Nov 23 14:26:19 2010 +0000 +++ b/TextLCD.cpp Sat Dec 04 11:29:57 2010 +0000 @@ -23,9 +23,9 @@ #include "TextLCD.h" #include "mbed.h" -TextLCD::TextLCD(PinName rs, PinName e, PinName d0, PinName d1, - PinName d2, PinName d3, LCDType type) : _rs(rs), - _e(e), _d(d0, d1, d2, d3), +TextLCD::TextLCD(PinName rs, PinName e, PinName d4, PinName d5, + PinName d6, PinName d7, LCDType type) : _rs(rs), + _e(e), _d(d4, d5, d6, d7), _type(type) { _e = 1;
--- a/TextLCD.h Tue Nov 23 14:26:19 2010 +0000 +++ b/TextLCD.h Sat Dec 04 11:29:57 2010 +0000 @@ -33,7 +33,7 @@ * #include "mbed.h" * #include "TextLCD.h" * - * TextLCD lcd(p10, p12, p15, p16, p29, p30); // rs, e, d0-d3 + * TextLCD lcd(p10, p12, p15, p16, p29, p30); // rs, e, d4-d7 * * int main() { * lcd.printf("Hello World!\n"); @@ -55,10 +55,10 @@ * * @param rs Instruction/data control line * @param e Enable line (clock) - * @param d0-d3 Data lines + * @param d4-d7 Data lines for using as a 4-bit interface * @param type Sets the panel size/addressing mode (default = LCD16x2) */ - TextLCD(PinName rs, PinName e, PinName d0, PinName d1, PinName d2, PinName d3, LCDType type = LCD16x2); + TextLCD(PinName rs, PinName e, PinName d4, PinName d5, PinName d6, PinName d7, LCDType type = LCD16x2); #if DOXYGEN_ONLY /** Write a character to the LCD