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33 lines
693 B
33 lines
693 B
#include "muxer.h"
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#include <avr/io.h>
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/*****************
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* themor-sensors are channels 0-3
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*
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* pt1000 is on channel 5
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*/
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void muxer_init(){
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DDRC |= (_BV(0)|_BV(1)|_BV(2)|_BV(3)); // conf as outputs
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PORTC |= _BV(3); // inhibit
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}
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void muxer_set(uint8_t channel){
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uint8_t selectbits = muxer_channel_to_selectbits(channel);
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PORTC |= _BV(3); // engage inhibit
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PORTC &= ~(0x07); //mask
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PORTC |= selectbits & 0x07; //set
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PORTC &= ~(_BV(3)); // disengage inhibit
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//TODO: delays, check everything, mask in register
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}
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uint8_t inline muxer_channel_to_selectbits(uint8_t channel){
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static uint8_t table[] = {2,1,0,3,5,7,6,4};
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if(channel>=8){
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return 0;
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}
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return(table[channel]);
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}
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