Question

Software The segment LEDs are driven through different GPIO Ports that are defined as digital outputs. The predefined hexadecimal encoding values need to be shifted to the corresponding bit in order to light up the correct segment LED on different Ports. The program counts from 0 through 15 with 1 sec interval, then rolls over to 0 again. The count values are shown on the seven segment display as 0, 1, 2, 3 4, 5, 6,7, 8, 9, A, b, C, d, E, and F

need a C Code to show the 7 segment from 0-9 and A-F. thank you

Answer 1

The code below is working fine . it may help you

CODE

#define Data7219 RB0_bit
#define Load7219 RB1_bit
#define Clk7219 RB2_bit

const unsigned char Font_B[16]=
{
        0x7e,0x30,0x6d,0x79,0x33,0x5b,0x5f,0x70,
        0x7f,0x7b,0x77,0x1f,0x4e,0x3d,0x4f,0x47
};

unsigned long value;
unsigned char dpset = 0;

void Send7219 (char,char);
void Send7219byte(char);
void MAX7219init();
void Display(float);

void main (void){
        TRISA = 0xFF;
        TRISB = 0x00;
        PORTB = 0x00;
        ANSEL = 0x00;
        ANSELH = 0x00;
        ADCON1 = 0x00;
        CM1CON0 = 0x00;
        CM2CON0 = 0x00;

        MAX7219init();
        Display(230.14592);                  //my_weird_number
        //Display(123.45678);                    //much easier to work with

        while(1){;}//Display(47110815);} //my_weird_number}
}

void MAX7219init()
{
        Data7219 =0;
        Load7219 =0;
        Clk7219 = 0;
        Send7219(0x09,0x00);//Decode Mode
        Send7219(0x0A,0x05);//Brightness
        Send7219(0x0B,0x07);//Scan limit
        Send7219(0x0C,0x01);
        Send7219(0x0F,0x00);
}

void Send7219 (char Digit,char Data)
{
        Send7219byte(Digit);
        Send7219byte(Data);
        Data7219=0;
        Load7219=1;
        Load7219=0;
}

void Send7219byte (char byte)
{
unsigned char I;
        for(I=0;I<8;I++)
        {
        if (byte & 0x80)
                Data7219=1;
        else
                Data7219=0;

        Clk7219=1;
        byte<<=1;
        Clk7219=0;
        }
}

void Display (float My_number)
{
        unsigned char dispskip;         // add 1 if "." found within string
        unsigned char i, string[23];

        FloatToStr(My_number, string);
        string[9] = 0;                // null terminate
        string[8] = 0x20;             // FloatToString returns 7 characters + ".", so blank the 9th

        dispskip = 8;                 // initialise
        for (i=0;i<8;i++)
        {
                if (string[dispskip-i] == 0x20)//0x20 is ASCII " "
                Send7219(i+1,0);
                          //send MAX7219 " " to MAX7219

                else if ((string[dispskip-i] <= 0x39))
                      Send7219(i+1,(Font_B[string[dispskip-i] - 0x30]));//0-9
                else
                      Send7219(i+1,(Font_B[string[dispskip-i] - 0x57]));//A-F
                      
                if (string[dispskip-i] == '.'){//0x20 is ASCII " "
                        dispskip = 7;                                                 //
                        if (string[dispskip-i] <= 0x39)
                       Send7219(i+1,(Font_B[string[dispskip-i] - 0x30]) | (0b10000000));//0-9
                        else
                  Send7219(i+1,(Font_B[string[dispskip-i] - 0x57]) | (0b10000000));//A-F
                }
        }
}  

THANK YOU