File content as of revision 7:a160cb7cdd86:

/**
* @file Max7221.cpp
* @brief MAX7219/7221 driver class.
* 
* @author Grzegorz Kaczmarek
* @comment Code inspired on erlier Dwayne S. Dilbeck's work
* @date 20/11/2015
*/

#include "mbed.h"
#include "Max7221.h"

Max7221::Max7221(SPI *spi, DigitalOut *cs, unsigned int position) :
    mp_spi(spi),
    mp_cs(cs),
    m_position(position)
{
}

void Max7221::CsLow()
{
    if(mp_cs != NULL) {
        *mp_cs = LOG_0;
    }
}

void Max7221::CsHigh()
{
    if(mp_cs != NULL) {
        *mp_cs = LOG_1;
    }
}

void Max7221::WriteRaw(unsigned int reg, unsigned int data) {
    if(mp_spi != NULL) {
        mp_spi->write(reg);
        mp_spi->write(data);
    }
}

void Max7221::Write(unsigned int reg, unsigned int data) {
    unsigned int i;
    
    CsLow();
    WriteRaw(reg, data);
    if(m_position > 0) {
        i = m_position;
        while(i--) {
            WriteRaw(max7219_reg_noop, 0x0);
        }
    }
    CsHigh();
}

void Max7221::TestMode(bool mode) {
    if(mode) {
        Write(max7219_reg_displayTest, 0x01);
    } else {
        Write(max7219_reg_displayTest, 0x00);
    }
}

void Max7221::UseDigitsNo(unsigned int digits_no) {
    if((digits_no > 0) && (digits_no < 9)) {
        Write(max7219_reg_scanLimit, (digits_no - 1));
    }
}

void Max7221::DecodeMode(unsigned int mode) {
    Write(max7219_reg_decodeMode, mode);
}

void Max7221::WriteDigit(unsigned int digit_no, unsigned int value) {
    if(digit_no < 8) {
        Write(digit_no, value);
    }
}

void Max7221::Intensity(unsigned int intensity) {
    if(intensity > 0x0F) {
        intensity = 0x0F;
    }
    Write(max7219_reg_intensity, intensity);
}

void Max7221::OperationMode(bool mode) {
    if(mode) {
        Write(max7219_reg_shutdown, 0x01);
    } else {
        Write(max7219_reg_shutdown, 0x00);
    }
}

void Max7221::Setup () {
    unsigned int i;

    TestMode(false);            // Disable display test
    UseDigitsNo(8);             // Use all 8 digits
    DecodeMode(0xFF);           // Turn on Code B font decode for all digits
    for(i=1;i<9;i++) {          // Clean all digits
        WriteDigit(i, 0x0F);
    }
    Intensity(0x01);            // Set lowest display intensity(0x00-0xFF)
    OperationMode(true);        // Enable operation mode
}