\u00a0<\/p>\n
\/\/ ADC STUFF
\nuint16_t ReadChannel(uint8_t mux)
\n{
\n\u00a0 uint8_t i;
\n\u00a0 uint16_t result;
\n\u00a0
\n\u00a0 ADMUX = mux;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Kanal waehlen
\n\u00a0 ADMUX |= (0<<REFS1) | (1<<REFS0); \/\/ interne Referenzspannung nutzen
\n\u00a0
\n\u00a0 ADCSRA = (1<<ADEN) | (1<<ADPS1)| (1<<ADPS2) | (0<<ADPS0);\u00a0\u00a0\u00a0 \/\/ Frequenzvorteiler
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ setzen auf 8 (1) und ADC aktivieren (1)
\n\u00a0
\n\u00a0 \/* nach Aktivieren des ADC wird ein “Dummy-Readout” empfohlen, man liest
\n\u00a0\u00a0\u00a0\u00a0 also einen Wert und verwirft diesen, um den ADC “warmlaufen zu lassen” *\/
\n\u00a0 ADCSRA |= (1<<ADSC);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ eine ADC-Wandlung
\n\u00a0 while ( ADCSRA & (1<<ADSC) ) {
\n\u00a0\u00a0\u00a0\u00a0 ;\u00a0\u00a0\u00a0\u00a0 \/\/ auf Abschluss der Konvertierung warten
\n\u00a0 }
\n\u00a0 result = ADCW;\u00a0 \/\/ ADCW muss einmal gelesen werden,
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ sonst wird Ergebnis der n\u00e4chsten Wandlung
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ nicht \u00fcbernommen.
\n\u00a0
\n\u00a0 \/* Eigentliche Messung – Mittelwert aus 4 aufeinanderfolgenden Wandlungen *\/
\n\u00a0 result = 0;
\n\u00a0<\/p>\n
\u00a0 for( i=4; i>=1; i– )
\n\u00a0 {
\n\u00a0\u00a0\u00a0 ADCSRA |= (1<<ADSC);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ eine Wandlung “single conversion”
\n\u00a0\u00a0\u00a0 while ( ADCSRA & (1<<ADSC) ) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0 ;\u00a0\u00a0 \/\/ auf Abschluss der Konvertierung warten
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 result += ADCW;\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Wandlungsergebnisse aufaddieren
\n\u00a0\/\/if (ADCW <= 350){lo++;lo1+=ADCW;}else{hi++;hi1+=ADCW;}<\/p>\n
\u00a0 }
\n\u00a0 ADCSRA &= ~(1<<ADEN);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ ADC deaktivieren (2)
\n\u00a0<\/p>\n
\/\/\u00a0if (lo>=hi){lo1\/=lo; result=hi1;} else {hi1\/=hi;result=hi1;}<\/p>\n
\u00a0 result \/= 4;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Summe durch vier teilen = arithm. Mittelwert
\n\u00a0
\n\u00a0
\n\/\/\u00a0mux==5?uart_puts(“5: “):uart_puts(“7: “);
\n\u00a0\/\/ Ausgabe an UART
\n\u00a0\u00a0 \/\/ if (debug==1)
\n\u00a0\u00a0
\n\u00a0
\n\u00a0 \/* uart_puts(itoa((1024-result),h,10));<\/p>\n
\u00a0
\n\u00a0\u00a0 uart_puts(“\\n\\r”);
\n\u00a0
\n*\/<\/p>\n
\u00a0<\/p>\n
\u00a0
\n\u00a0\u00a0\u00a0\u00a0
\n\u00a0 return result;
\n}
\n\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"
\u00a0 \/\/ ADC STUFF uint16_t ReadChannel(uint8_t mux) { \u00a0 uint8_t i; \u00a0 uint16_t result; \u00a0 \u00a0 ADMUX = mux;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ Kanal waehlen \u00a0 ADMUX |= (0<<REFS1) | (1<<REFS0); \/\/ interne Referenzspannung nutzen \u00a0 \u00a0 ADCSRA = (1<<ADEN) | (1<<ADPS1)| (1<<ADPS2) | (0<<ADPS0);\u00a0\u00a0\u00a0 \/\/ Frequenzvorteiler \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ setzen auf 8 (1) und ADC aktivieren (1) \u00a0… Continue reading AVR: ADC einfach auslesen<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-19","post","type-post","status-publish","format-standard","hentry","category-avr","entry"],"_links":{"self":[{"href":"https:\/\/wp.oktay.com\/index.php?rest_route=\/wp\/v2\/posts\/19","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.oktay.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.oktay.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.oktay.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.oktay.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=19"}],"version-history":[{"count":0,"href":"https:\/\/wp.oktay.com\/index.php?rest_route=\/wp\/v2\/posts\/19\/revisions"}],"wp:attachment":[{"href":"https:\/\/wp.oktay.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=19"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.oktay.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=19"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.oktay.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=19"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}