File content as of revision 4:c1438ffd88dd:

#include "mbed.h"
#include "TextLCD.h"
#define VMAX 0.36f
#define VMIN 0.05f


Serial  pc(USBTX, USBRX, 115200);

Ticker  ticker1;

CAN     can1(PB_8, PB_9); 
CANMessage  can_msg_1;
CANMessage  can_msg_send;
char data_msg[3] = {0x11,0x22,0x33};


bool armed = false;
AnalogIn   res(PA_0);
float volt = 0;


I2C i2c_lcd(PB_7,PB_6); // SDA, SCL
TextLCD_I2C lcd(&i2c_lcd, 0x7E, TextLCD::LCD16x2); // I2C bus, PCF8574 Slaveaddress, LCD Type

const char fill[] = {0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x00};
const char empty[] = {0x1F, 0x11, 0x11, 0x11, 0x11, 0x11, 0x1F, 0x00};


void showBar(void);

void CAN_RX1(void);

void sendCMD(void)
{
    if(armed)
    {
        can_msg_send = CANMessage(0x111,data_msg,3,CANData,CANStandard);
        can1.write(can_msg_send); 
    }
    
    //printf("res: %f\n", res.read());
}

int main()
{

    can1.frequency(500000);
    can1.attach(&CAN_RX1, CAN::RxIrq);
    ticker1.attach(&sendCMD, 1);
    pc.printf("start\n");

    
    
    lcd.setCursor(TextLCD::CurOff_BlkOff);
    lcd.setBacklight(TextLCD::LightOn); 
    lcd.setUDC(0, (char *) fill);
    lcd.setUDC(1, (char *) empty);
    pc.printf("set done\n\r");
    
    while(1)
    {   
        volt = res.read();
        showBar();
    }

}



void CAN_RX1(void)
{
    if(can1.read(can_msg_1)) 
    {
        pc.printf("CAN RX %d\n", can_msg_1.id);

    }
}

void showBar(void)
{
    int bars = 16 * (volt-VMIN)/(VMAX-VMIN);    
    if (bars > 16)
        bars = 16;
    else if( bars < 0 )
        bars = 0; 
        
        
    for(int i = 0; i<bars ;i++)
    {
        lcd.locate(i,0);
        lcd.putc(0);    
    }
    for(int i = bars; i<16 ;i++)
    {
        lcd.locate(i,0);
        lcd.putc(1);    
    }
}