source: firmware/FSC/usb_src/muxer_fsc.c@ 18558

#include "muxer_fsc.h"

// Sets voltage Muxer to current channel
// this is a Muxing, and therefor the adc might need some time to settle.
// Since there are:
//      - 40 voltage monitor channels
//      - 40 current monitor channels
//      - 4 humidity monitor channels
// the muxer is set as follows.
// channel 00..39 --> looking at the voltage channels
// channel 40..79 --> looking at the current channels
// channel 80..83 --> looking at the humidities
void Set_V_Muxer (U08 channel){
U08 SB = 0;
        // voltages
        if (channel < 40) {
                if (channel < 36)
                        SB = channel*2;
                else
                        SB = (channel+1)*2;
        }
        // currents
        else if (channel < 80) {
                channel -= 40;
                if (channel < 36)
                        SB = channel*2+1;
                else
                        SB = (channel+1)*2+1;
        }
        // humidities
        else if (channel < 84) {
                channel -= 80;
                switch (channel) {
                        case 0:
                                SB = 0x48; //0100.1000
                                break;
                        case 1:
                                SB = 0x49; //0100.1001
                                break;
                        case 2:
                                SB = 0x58; //0101.0010
                                break;
                        case 3:
                                SB = 0x58; //0101.0011
                                break;
                } // end of switch-case
        } // end of if (channel < some_number)

        PORTC = (PORTC & 0x80) | (0x7F & SB); // Here the muxer is switched.
}

void Set_T_Muxer(U08 channel) {
U08 SA = 0x00;

        switch (channel/16) {
                case 0:
                        SA |= 1<<4; // 0001.0000
                        break;
                case 1:
                        break;          // 0000.0000
                case 2:
                        SA |= (1<<4)|(1<<5); // 0011.0000
                        break;
                case 3:
                        SA |= 1<<5;  // 0010.0000
                        break;
        }
        
        SA =  SA | (channel%16);
        
        PORTA = (PORTA & 0xC0) | (0x3F & SA); // Here the muxer is switched.
}