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
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Diff: TextLCD.cpp
- Revision:
- 11:9ec02df863a1
- Parent:
- 10:dd9b3a696acd
- Child:
- 12:6bf9d9957d31
--- a/TextLCD.cpp Mon Feb 04 21:48:24 2013 +0000 +++ b/TextLCD.cpp Tue Feb 05 21:03:43 2013 +0000 @@ -84,15 +84,15 @@ break; } - writeCommand(0x0C); // Display Ctrl 0000 1 D C B - // Display On, Cursor Off, Blink Off - _cursor = CurOff; - writeCommand(0x06); // Entry Mode 0000 01 CD S // Cursor Direction and Display Shift // CD=1 (Cur incr) // S=0 (No display shift) +// writeCommand(0x0C); // Display Ctrl 0000 1 D C B +// // Display On, Cursor Off, Blink Off + cursor(TextLCD::CurOff_BlkOff); + cls(); } @@ -326,25 +326,43 @@ } -TextLCD::LCDCursor TextLCD::cursor(TextLCD::LCDCursor show) { - LCDCursor cur = _cursor; +void TextLCD::cursor(TextLCD::LCDCursor show) { switch (show) { - case CurOn : writeCommand(0x0F); // Cursor on and Blink char - wait_us(40); - _cursor = show; - break; - case CurOff : writeCommand(0x0C); - wait_us(40); - _cursor = show; - break; + case CurOff_BlkOff : writeCommand(0x0C); // Cursor off and Blink Off + wait_us(40); + _cursor = show; + break; + + case CurOn_BlkOff : writeCommand(0x0E); // Cursor on and Blink Off + wait_us(40); + _cursor = show; + break; + + case CurOff_BlkOn : writeCommand(0x0D); // Cursor off and Blink On + wait_us(40); + _cursor = show; + break; + + case CurOn_BlkOn : writeCommand(0x0F); // Cursor on and Blink char + wait_us(40); + _cursor = show; + break; + default : - break; + break; } - return cur; + } +void TextLCD::setUDC(unsigned char c, char *udc_data) { + writeCommand(0x40 + ((c & 0x07) << 3)); //Set CG-RAM address + + for (int i=0; i<8; i++) { + writeData(*udc_data++); + } +}