Library for Matrix Orbital VFD2041 display. Also useable for LCD2041 modules.
VFD.cpp
- Committer:
- wsalis01
- Date:
- 2012-03-10
- Revision:
- 3:b96f8fff00e8
- Parent:
- 2:b170a67a8dae
- Child:
- 4:f17ce5ab5d01
File content as of revision 3:b96f8fff00e8:
#include "mbed.h" #include <string> #include "VFD.h" /** VFD::VFD() Constructor * Initizlizes the I2C Bus */ VFD::VFD() : _i2c(SDA, SCL) { //Nothing to see here } VFD::VFD(PinName data, PinName clock) : _i2c(data, clock) { //Nothing to see here } VFD::~VFD() { //Nothing to see here } /** VFD2041 initialization function * @returns I2C write() return value */ int VFD::init() { const char cmd[] = {254,160,0}; int length = 3; return write(cmd, length); } /** Prints a string to the VFD * @param msg is a string to be printed to the display * @returns I2c write() return value */ int VFD::print(string msg) { return write(msg.data(), msg.size()); } /** Turns on display autoscroll * @returns I2c write() return value */ int VFD::autoScrollOn() { const char cmd[] = {254, 81}; int length = 2; return write(cmd, length); } /** Turns off diaplay autoscroll * @returns I2c write() return value */ int VFD::autoScrollOff() { const char cmd[] = {254, 82}; int length = 2; return write(cmd, length); } /** Turns on display linewrap * @returns I2c write() return value */ int VFD::lineWrapOn() { const char cmd[] = {254, 67}; int length = 2; return write(cmd, length); } /** Turns off display linewrap * @returns I2c write() return value */ int VFD::lineWrapOff() { const char cmd[] = {254, 68}; int length = 2; return write(cmd, length); } /** Sets the cursor position on the display * @param col is the column to set the cursor * @param row is the row to set the cursor * @returns I2c write() return value */ int VFD::setCursor(const int col, const int row) { const char cmd[] = {254, 71, col, row}; int length = 4; return write(cmd, length); } /** Clears the entire contents of the display * @returns I2c write() return value */ int VFD::clearScreen() { const char cmd[] = {254, 88}; int length = 2; return write(cmd, length); } /** Sets the cursor position to col 0, row 0 ( top left position ) * @returns I2c write() return value */ int VFD::goHome() { const char cmd[] = {254, 72}; int length = 2; return write(cmd, length); } /** Initialize memory for the display of large numbers ( 4 rows high ) * @returns I2c write() return value */ int VFD::initLargeNumbers() { const char cmd[] = {254, 110}; int length = 2; return write(cmd, length); } /** Sets the brightness of the display * @param val determines the brightness as follows: 0 -> 100%, 1 -> 75%, 2 -> 50%, 3 -> 25%. * @returns I2c write() return value */ int VFD::setBrightness(const int val) { if (val < 0 || val > 3) return -1; const char cmd[] = {254, 89, val}; int length = 3; return write(cmd, length); } /** VFD::write * @param data is a non-null terminated array of characters to write to the display * @param length is the number of characters in the data array * @returns I2C write return value */ int VFD::write(const char * data, int length) { int ret = _i2c.write(ADDRESS, data, length); //Performs a complete write transaction wait_us(625); return ret; //Return I2C.write(...) return value } /** VFD::read * @param data is a pointer to a char array to copy read data into * @param length is the number of characters to copy into the data array * @returns I2C read return value */ int VFD::read(char * data, int length) { int ret = _i2c.read(ADDRESS, data, length); //Performs a complete write transaction wait_us(625); return ret; //Return I2C.write(...) return value }