Library for the Princeton PT6312 Vacuum Fluorescent Display (VFD) driver.
This library is documented here.
PT6312.cpp
- Committer:
- wim
- Date:
- 2015-08-25
- Revision:
- 1:c5e247159aa6
- Parent:
- 0:e59142cded2b
- Child:
- 2:f010b7022803
File content as of revision 1:c5e247159aa6:
/* mbed PT6312 Library, for Princeton PT6312 VFD controller * Copyright (c) 2015, v01: WH, Initial version * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "mbed.h" #include "PT6312.h" #include "Font_16Seg.h" /** Constructor for class for driving Princeton PT6312 VFD controller * * @brief Supports 4 Digits of 16 Segments upto 10 Digits of 12 Segments. Also supports a scanned keyboard of upto 24 keys, 4 switches and 4 LEDs. * SPI bus interface device. * * @param PinName mosi, miso, sclk, cs SPI bus pins * @param Mode selects either number of Digits and Segments */ PT6312::PT6312(PinName mosi, PinName miso, PinName sclk, PinName cs, Mode mode) : _spi(mosi,miso,sclk), _cs(cs), _mode(mode) { _init(); } /** Init the SPI interface and the controller * @param none * @return none */ void PT6312::_init(){ //init SPI _cs=1; _spi.format(8,3); //PT6312 uses mode 3 (Clock High on Idle, Data latched on second (=rising) edge) // _spi.frequency(100000); _spi.frequency(500000); //init controller _writeCmd(PT6312_MODE_SET_CMD, _mode); // Mode set command _display = PT6312_DSP_ON; _bright = PT6312_BRT_DEF; _writeCmd(PT6312_DSP_CTRL_CMD, _display | _bright ); // Display control cmd, display on/off, brightness _writeCmd(PT6312_DATA_SET_CMD, PT6312_DATA_WR | PT6312_ADDR_INC | PT6312_MODE_NORM); // Data set cmd, normal mode, auto incr, write data } /** Clear the screen and locate to 0 */ void PT6312::cls() { _cs=0; wait_us(1); _spi.write(_flip(PT6312_ADDR_SET_CMD | 0x00)); // Address set cmd, 0 for (int cnt=0; cnt<PT6312_DISPLAY_MEM; cnt++) { _spi.write(0x00); // data } wait_us(1); _cs=1; } /** Set Brightness * * @param char brightness (3 significant bits, valid range 0..7 (1/16 .. 14/14 dutycycle) * @return none */ void PT6312::setBrightness(char brightness){ _bright = brightness & PT6312_BRT_MSK; // mask invalid bits _writeCmd(PT6312_DSP_CTRL_CMD, _display | _bright ); // Display control cmd, display on/off, brightness } /** Set the Display mode On/off * * @param bool display mode */ void PT6312::setDisplay(bool on) { if (on) { _display = PT6312_DSP_ON; } else { _display = PT6312_DSP_OFF; } _writeCmd(PT6312_DSP_CTRL_CMD, _display | _bright ); // Display control cmd, display on/off, brightness } /** Write databyte to PT6312 * @param int address display memory location to write byte * @param char data byte written at given address * @return none */ void PT6312::writeData(int address, char data) { _cs=0; wait_us(1); _spi.write(_flip(PT6312_ADDR_SET_CMD | (address & PT6312_ADDR_MSK))); // Set Address cmd _spi.write(_flip(data)); // data wait_us(1); _cs=1; } /** Write Display datablock to PT6312 * @param DisplayData_t data Array of PT6312_DISPLAY_MEM (=16) bytes for displaydata (starting at address 0) * @return none */ void PT6312::writeData(DisplayData_t data) { _cs=0; wait_us(1); _spi.write(_flip(PT6312_ADDR_SET_CMD | 0x00)); // Set Address at 0 for (int idx=0; idx<PT6312_DISPLAY_MEM; idx++) { _spi.write(_flip(data[idx])); // data } wait_us(1); _cs=1; } /** Read keydata block from PT6312 * @param *keydata Ptr to Array of PT6312_KEY_MEM (=3) bytes for keydata * @return bool keypress True when at least one key was pressed * * Note: Due to the hardware configuration the PT6312 key matrix scanner will detect multiple keys pressed at same time, * but this may also result in some spurious keys being set in keypress data array. * It may be best to ignore all keys in those situations. That option is implemented in this method depending on #define setting. */ bool PT6312::getKeys(KeyData_t *keydata) { int keypress = 0; char data; // Read keys _cs=0; wait_us(1); // Enable Key Read mode _spi.write(_flip(PT6312_DATA_SET_CMD | PT6312_KEY_RD | PT6312_ADDR_INC | PT6312_MODE_NORM)); // Data set cmd, normal mode, auto incr, read data for (int idx=0; idx < PT6312_KEY_MEM; idx++) { data = _flip(_spi.write(0xFF)); // read keys and correct bitorder if (data != 0) { // Check for any pressed key for (int bit=0; bit < PT6312_KEY_BITS; bit++) { if (data & (1 << bit)) {keypress++;} // Test all significant bits } } (*keydata)[idx] = data; // Store keydata after correcting bitorder } wait_us(1); _cs=1; // Restore Data Write mode _writeCmd(PT6312_DATA_SET_CMD, PT6312_DATA_WR | PT6312_ADDR_INC | PT6312_MODE_NORM); // Data set cmd, normal mode, auto incr, write data #if(1) // Dismiss multiple keypresses at same time return (keypress == 1); #else // Allow multiple keypress and accept possible spurious keys return (keypress > 0); #endif } /** Read switches from PT6312 * * @param none * @return char for switch data (4 least significant bits) * */ char PT6312::getSwitches() { char data; // Read switches _cs=0; wait_us(1); // Enable Switch Read mode _spi.write(_flip(PT6312_DATA_SET_CMD | PT6312_SW_RD | PT6312_ADDR_INC | PT6312_MODE_NORM)); // Data set cmd, normal mode, auto incr, read data data = _flip(_spi.write(0xFF)) & PT6312_SW_MSK; // read switches and correct bitorder wait_us(1); _cs=1; // Restore Data Write mode _writeCmd(PT6312_DATA_SET_CMD, PT6312_DATA_WR | PT6312_ADDR_INC | PT6312_MODE_NORM); // Data set cmd, normal mode, auto incr, write data return data; } /** Set LEDs * * @param char leds (4 least significant bits) * @return none */ void PT6312::setLED (char leds) { // Set LEDs _cs=0; wait_us(1); // Enable LED Write mode _spi.write(_flip(PT6312_DATA_SET_CMD | PT6312_LED_WR | PT6312_ADDR_INC | PT6312_MODE_NORM)); // Data set cmd, normal mode, auto incr, write data _spi.write(_flip(leds & PT6312_LED_MSK)); // write LEDs in correct bitorder wait_us(1); _cs=1; // Restore Data Write mode _writeCmd(PT6312_DATA_SET_CMD, PT6312_DATA_WR | PT6312_ADDR_INC | PT6312_MODE_NORM); // Data set cmd, normal mode, auto incr, write data } /** Helper to reverse all command or databits. The PT6312 expects LSB first, whereas SPI is MSB first * @param char data * @return bitreversed data */ char PT6312::_flip(char data) { char value=0; if (data & 0x01) {value |= 0x80;} ; if (data & 0x02) {value |= 0x40;} ; if (data & 0x04) {value |= 0x20;} ; if (data & 0x08) {value |= 0x10;} ; if (data & 0x10) {value |= 0x08;} ; if (data & 0x20) {value |= 0x04;} ; if (data & 0x40) {value |= 0x02;} ; if (data & 0x80) {value |= 0x01;} ; return value; } /** Write command and parameter to PT6312 * @param int cmd Command byte * &Param int data Parameters for command * @return none */ void PT6312::_writeCmd(int cmd, int data){ _cs=0; wait_us(1); // _spi.write(_flip( (cmd & 0xF0) | (data & 0x0F))); _spi.write(_flip( (cmd & PT6312_CMD_MSK) | (data & ~PT6312_CMD_MSK))); wait_us(1); _cs=1; }; /** Constructor for class for driving Princeton PT6312 VFD controller as used in Philips DVD625 * * @brief Supports 4 Digits of 16 Segments upto 11 Digits of 11 Segments. Also supports a scanned keyboard of upto 24 keys, 4 switches and 4 LEDs. * SPI bus interface device. * @param PinName mosi, miso, sclk, cs SPI bus pins */ PT6312_DVD625::PT6312_DVD625(PinName mosi, PinName miso, PinName sclk, PinName cs) : PT6312(mosi, miso, sclk, cs, Dig7_Seg15) { _column = 0; _columns = 7; } #if(0) #if DOXYGEN_ONLY /** Write a character to the LCD * * @param c The character to write to the display */ int putc(int c); /** Write a formatted string to the LCD * * @param format A printf-style format string, followed by the * variables to use in formatting the string. */ int printf(const char* format, ...); #endif #endif /** Locate cursor to a screen column * * @param column The horizontal position from the left, indexed from 0 */ void PT6312_DVD625::locate(int column) { } /** Number of screen columns * * @param none * @return columns */ int PT6312_DVD625::columns() { return _columns; } /** Clear the screen and locate to 0 */ void PT6312_DVD625::cls() { PT6312::cls(); } /** Write a single character (Stream implementation) */ int PT6312_DVD625::_putc(int value) { int addr; if (value == '\n') { //No character to write //Update Cursor _column = 0; } else { //Character to write value = value - 'A'; addr = ((_columns - 1) - _column) * 2; PT6312::writeData(addr, font_16A[value][0]); PT6312::writeData(addr + 1, font_16A[value][1]); //Update Cursor _column++; if (_column >= columns()) { _column = 0; } } //else // //Set next memoryaddress, make sure cursor blinks at next location // addr = getAddress(_column, _row); // _writeCommand(0x80 | addr); return value; } // get a single character (Stream implementation) int PT6312_DVD625::_getc() { return -1; }