DS_MAX7219/Src/DS_MAX7219.c

#include "../inc/DS_MAX7219.h"
#include <stdio.h>

void DS_MAX7219_Init(DS_MAX7219* Display, SPI_HandleTypeDef* SPI, GPIO_TypeDef* Port_CS, uint16_t Pin_CS)
{
    HAL_Delay(500);
    Display->SPI = SPI;
    Display->DecodeMode = 0;
    Display->Intensivity = 8;
    Display->ScanLimit = 7;
    Display->EnableDecodeMode = true;

    Display->Port_CS = Port_CS;
    Display->Pin_CS = Pin_CS;
    
    for (uint8_t i = 0; i < 9; i++)
    {
        Display->DisplayData[i] = ' ';
    }
    
    __DS_MAX7219_SendConfigData(Display);
    DS_MAX7219_UpdataDisplay(Display);
}

void DS_MAX7219_Print(DS_MAX7219* Display, int64_t Number)
{
    if (Number<0)
    {
        Display->DisplayData[0] = '-';
        Number = Number * -1;
    }
    else
        Display->DisplayData[0] = ' ';


    uint8_t t = Number/1000000;

    if (t==0)
        Display->DisplayData[1] = ' ';
    else if (t<10)
    {
        Display->DisplayData[1] = t;
        Number = Number - t*1000000;
    }
    else
    {
        Display->DisplayData[0] = 
        Display->DisplayData[1] = 
        Display->DisplayData[2] = 
        Display->DisplayData[3] = 
        Display->DisplayData[4] = 
        Display->DisplayData[5] = 
        Display->DisplayData[6] = 
        Display->DisplayData[7] = '9';
        return;
    }

    t = Number/100000;
    if ((t==0)&&(Display->DisplayData[1] == ' '))
        Display->DisplayData[2] = ' ';
    else
    {
        Display->DisplayData[2] = t;
        Number = Number - t*100000;
    }

    t = Number/10000;
    if ((t==0)&&(Display->DisplayData[2] == ' '))
        Display->DisplayData[3] = ' ';
    else
    {
        Display->DisplayData[3] = t;
        Number = Number - t*10000;
    }

    t = Number/1000;
    if ((t==0)&&(Display->DisplayData[3] == ' '))
        Display->DisplayData[4] = ' ';
    else
    {
        Display->DisplayData[4] = t;
        Number = Number - t*1000;
    }

    t = Number/100;
    if ((t==0)&&(Display->DisplayData[4] == ' '))
        Display->DisplayData[5] = ' ';
    else
    {
        Display->DisplayData[5] = t;
        Number = Number - t*100;
    }

    t = Number/10;
    if ((t==0)&&(Display->DisplayData[5] == ' '))
        Display->DisplayData[6] = ' ';
    else
    {
        Display->DisplayData[6] = t;
        Number = Number - t*10;
    }

    Display->DisplayData[7] = Number;
}

uint8_t __DS_MAX7219_ConvertSymbol(char Symbol)
{
    switch (Symbol)
    {
    case '0':
        return 0;
        break;
    case '1':
        return 1;
        break;
    case '2':
        return 2;
        break;
    case '3':
        return 3;
        break;
    case '4':
        return 4;
        break;
    case '5':
        return 5;
        break;
    case '6':
        return 6;
        break;
    case '7':
        return 7;
        break;
    case '8':
        return 8;
        break;
    case '9':
        return 9;
        break;
    case '-':
        return 10;
        break;
    case 'E':
        return 11;
        break;
    case 'H':
        return 12;
        break;
    case 'L':
        return 13;
        break;
    case 'P':
        return 14;
        break;
    case ' ':
        return 15;
        break;
    
    default:
        break;
    }
    return Symbol;
}

void DS_MAX7219_UpdataDisplay(DS_MAX7219 *Display)
{
    for (uint8_t i = 0; i < 8; i++)
    {
        HAL_GPIO_WritePin(Display->Port_CS, Display->Pin_CS, GPIO_PIN_RESET);
        uint16_t Data = ((i+1)<<8) + __DS_MAX7219_ConvertSymbol(Display->DisplayData[7-i]);
        HAL_SPI_Transmit(Display->SPI, (uint8_t*) &Data, 1, 100);
        HAL_GPIO_WritePin(Display->Port_CS, Display->Pin_CS, GPIO_PIN_SET);
    }
}

void DS_MAX7219_ConfigureDisplay(DS_MAX7219 *Display, uint8_t DecodeMode, uint8_t Intensivity, uint8_t ScanLimit)
{
    Display->DecodeMode = DecodeMode;
    
    if(Intensivity>0xF)
        Display->Intensivity = 0xF;
    else
        Display->Intensivity = Intensivity;

    if(ScanLimit>0x7)
        Display->ScanLimit = 0x7;
    else
        Display->ScanLimit = ScanLimit;

    __DS_MAX7219_SendConfigData(Display);
}

void __DS_MAX7219_SendConfigData(DS_MAX7219 *Display)
{
    uint16_t Data[5];
    // 0 - Decode mode      0x9
    // 1 - Intensivity      0xA
    // 2 - ScanLimit        0xB
    // 3 - Shutdown mode    0xC
    // 4 - Display test     0xF
    if (Display->EnableDecodeMode)
        Data[0]=0x9FF;
    else
        Data[0]=0x900;
    
    Data[1] = 0xA00 + Display->Intensivity;
    Data[2] = 0xB00 + Display->ScanLimit;
    Data[3] = 0xC00 + 1;
    Data[4] = 0xF00 + 0;

    for (uint8_t i = 0; i < 5; i++)
    {
        HAL_GPIO_WritePin(Display->Port_CS, Display->Pin_CS, GPIO_PIN_RESET);
        HAL_SPI_Transmit(Display->SPI, (uint8_t*) &Data[i], 1, 100);
        HAL_GPIO_WritePin(Display->Port_CS, Display->Pin_CS, GPIO_PIN_SET);
    }
}