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en:multiasm:exercisesbook:arduinouno [2026/03/26 23:11] – [Table] pczekalskien:multiasm:exercisesbook:arduinouno [2026/03/26 23:42] (current) – [Reading analogue values] pczekalski
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 <table assemblergpioinstructions> <table assemblergpioinstructions>
-<caption>Common GPIO-operating, bit level instructions</caption>+<caption>Common GPIO-related, I/O instructions</caption>
 ^ Instruction  ^ Description                                                      ^ ^ Instruction  ^ Description                                                      ^
 | ''SBI''      | Set bit in register                                              | | ''SBI''      | Set bit in register                                              |
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 | ''OUT''      | Write the general-purpose register to the hardware register.     | | ''OUT''      | Write the general-purpose register to the hardware register.     |
 | ''ANDI''     | Masks a bit                                                      | | ''ANDI''     | Masks a bit                                                      |
-| 'ORI''       | Sets a bit                                                       |+| ''ORI''       | Sets a bit                                                       |
 </table> </table>
  
 A common scenario is to first set either the GPIO is input or output (using the correct DDRx register), then either set (''SBI''), reset (''CBI''), check (''SBIS'', ''SBIC''), read the whole register (''IN'') or write the whole register (''OUT''). A common scenario is to first set either the GPIO is input or output (using the correct DDRx register), then either set (''SBI''), reset (''CBI''), check (''SBIS'', ''SBIC''), read the whole register (''IN'') or write the whole register (''OUT'').
 <note tip>''IN'' and ''OUT'' instructions operate on whole, 8-bit registers rather than on single bits. Those are general-purpose instructions, covering the whole range of IO registers (0-63), beyond aforementioned DDRx, PORTx and PINx registers.</note> <note tip>''IN'' and ''OUT'' instructions operate on whole, 8-bit registers rather than on single bits. Those are general-purpose instructions, covering the whole range of IO registers (0-63), beyond aforementioned DDRx, PORTx and PINx registers.</note>
 +
 +==== Examples ====
 +Below are sections representing common usage scenarios:
 +
 +==== Reading analogue values ====
 +Reading of the analogue values is not so straightforward as in the case of binary ones. 
 +Built-in ADC converter uses 10-bit resolution, has 6 channels (A0-A5, respectively). It also uses a reference voltage (configurable), typically 5V.\\
 +The low-level ADC register-based operations use the following formula to obtain an ADC value (figure {{ref>avreq1}}, based on the input value ''Vgpio'' and the reference value ''Vref'').
 +
 +<figure avreq1>
 +{{:en:multiasm:exercisesbook:screenshot_from_2026-03-26_22-41-59.png?200|}}
 +<caption>ADC value calculation based on the input voltage and reference voltage</caption>
 +</figure>
 +
 +Analogue reading uses a complex setup of ADC-related registers as presented in table {{ref>tabadcregisters}}:
 +
 +<table tabadcregisters>
 +<caption>ADC-related registers used for reading the analogue values of GPIOs</caption>
 +^ Register   ^ Description                    ^
 +| ''ADMUX''  | Selects voltage reference and  |
 +|            |                                |
 +|            |                                |
 +|            |                                |
 +</table>
 +
en/multiasm/exercisesbook/arduinouno.1774559507.txt.gz · Last modified: by pczekalski
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