added lcd.start()
Fork of TextLCD by
Revision 9:496c520855a1, committed 2018-01-08
- Comitter:
- ritarosakai
- Date:
- Mon Jan 08 07:21:35 2018 +0000
- Parent:
- 8:308d188a2d3a
- Child:
- 10:cec91d426d65
- Commit message:
- Added lcd.start()
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 Thu Jan 02 21:07:01 2014 +0000 +++ b/TextLCD.cpp Mon Jan 08 07:21:35 2018 +0000 @@ -25,9 +25,13 @@ 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(e), _d(d4, d5, d6, d7), + _type(type) +{ +} +void TextLCD::start() +{ _e = 1; _rs = 0; // command mode @@ -47,24 +51,44 @@ cls(); } -void TextLCD::character(int column, int row, int c) { +void TextLCD::character(int column, int row, int c) +{ int a = address(column, row); writeCommand(a); writeData(c); } -void TextLCD::cls() { +void TextLCD::cls() +{ + _e = 1; + _rs = 0; // command mode + + wait(0.015); // Wait 15ms to ensure powered up + + // send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus) + for (int i=0; i<3; i++) { + writeByte(0x3); + wait(0.00164); // this command takes 1.64ms, so wait for it + } + writeByte(0x2); // 4-bit mode + wait(0.000040f); // most instructions take 40us + + writeCommand(0x28); // Function set 001 BW N F - - + writeCommand(0x0C); + writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes writeCommand(0x01); // cls, and set cursor to 0 wait(0.00164f); // This command takes 1.64 ms locate(0, 0); } -void TextLCD::locate(int column, int row) { +void TextLCD::locate(int column, int row) +{ _column = column; _row = row; } -int TextLCD::_putc(int value) { +int TextLCD::_putc(int value) +{ if (value == '\n') { _column = 0; _row++; @@ -85,11 +109,13 @@ return value; } -int TextLCD::_getc() { +int TextLCD::_getc() +{ return -1; } -void TextLCD::writeByte(int value) { +void TextLCD::writeByte(int value) +{ _d = value >> 4; wait(0.000040f); // most instructions take 40us _e = 0; @@ -102,17 +128,20 @@ _e = 1; } -void TextLCD::writeCommand(int command) { +void TextLCD::writeCommand(int command) +{ _rs = 0; writeByte(command); } -void TextLCD::writeData(int data) { +void TextLCD::writeData(int data) +{ _rs = 1; writeByte(data); } -int TextLCD::address(int column, int row) { +int TextLCD::address(int column, int row) +{ switch (_type) { case LCD20x4: switch (row) { @@ -134,7 +163,8 @@ } } -int TextLCD::columns() { +int TextLCD::columns() +{ switch (_type) { case LCD20x4: case LCD20x2: @@ -146,7 +176,8 @@ } } -int TextLCD::rows() { +int TextLCD::rows() +{ switch (_type) { case LCD20x4: return 4;
--- a/TextLCD.h Thu Jan 02 21:07:01 2014 +0000 +++ b/TextLCD.h Mon Jan 08 07:21:35 2018 +0000 @@ -32,15 +32,16 @@ * @code * #include "mbed.h" * #include "TextLCD.h" - * + * * TextLCD lcd(p10, p12, p15, p16, p29, p30); // rs, e, d4-d7 - * + * * int main() { * lcd.printf("Hello World!\n"); * } * @endcode */ -class TextLCD : public Stream { +class TextLCD : public Stream +{ public: /** LCD panel format */ @@ -84,7 +85,7 @@ /** Clear the screen and locate to 0,0 */ void cls(); - + void start(); int rows(); int columns();