File content as of revision 2:b170a67a8dae:

#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() {
    //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
}