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en:multiasm:exercisesbook:arduinouno [2026/05/04 14:34] – [Use Serial Port for Tracing] pczekalskien:multiasm:exercisesbook:arduinouno [2026/05/04 14:55] (current) – [Function Call Standards] ktokarz
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 Start conversion by setting the ADSC bit (6) of ADSCRA to 1.  Start conversion by setting the ADSC bit (6) of ADSCRA to 1. 
-ADC requires some time to read the value and complete the conversion (it is based on a capacitor); thus, when it is ready to read, the ADSC bit is cleared by the ADC hardware.+ADC requires some time to complete the conversion; thus, when the result is ready to read, the ADSC bit is cleared by the ADC hardware.
 Here, we do not use any interrupts, just dummy pulling. Here, we do not use any interrupts, just dummy pulling.
 <code asm> <code asm>
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 ** Speed vs Quality ** ** Speed vs Quality **
-ADC converts an analogue value to its digital representation using a capacitor. Charging and discharging of the capacitor require time and depend on the impedance of the analogue signal's input source. The general rule says that the faster the conversion, the lower the quality and the higher the error ratio. Conversion speed can be controlled using a prescaler value (bits ADPS2, ADPS1, and ADPS0 of the ADCSRA register). The prescaler divides the clock frequency (16MHz) to slow down the conversion process. Prescaler value and related conversion speed and time is presented in table {{ref>arduinoadcprescaler}}.+ADC converts an analogue value to its digital representation using a method called successive approximation, measuring the voltage stored in a capacitor. Charging and discharging of the capacitor require time and depend on the impedance of the analogue signal's input source. The general rule says that the faster the conversion, the lower the quality and the higher the error ratio. Conversion speed can be controlled using a prescaler value (bits ADPS2, ADPS1, and ADPS0 of the ADCSRA register). The prescaler divides the clock frequency (16MHz) to slow down the conversion process. Prescaler value and related conversion speed and time are presented in table {{ref>arduinoadcprescaler}}.
  
 <table arduinoadcprescaler> <table arduinoadcprescaler>
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 To use a string (e.g. constant) that is stored in Flash, convert this line: To use a string (e.g. constant) that is stored in Flash, convert this line:
 ''ld   r18, Z+'' -> ''lpm   r18, Z+''.</note> ''ld   r18, Z+'' -> ''lpm   r18, Z+''.</note>
-<note important>If you run this function in a loop, give it a delay after each Serial port sending session is finished to let the hardware clean buffers. </note>+<note important>If you run this function in a loop, add a delay after each Serial port sending session to let the hardware clear buffers. </note>
  
 ** Delay (in ms) **\\ ** Delay (in ms) **\\
en/multiasm/exercisesbook/arduinouno.1777894454.txt.gz · Last modified: by pczekalski
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