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--- en:multiasm:exercisesbook:avr:sut [2025/12/12 11:58] – [Table] pczekalski
+++ en:multiasm:exercisesbook:avr:sut [2025/12/13 12:15] (current) – [Communication] ktokarz
@@ Line 5: / Line 5: @@
   * user interface board presented on the image {{ref>sutavrlabimage1}}.
-There are 8 laboratory nodes. They can be used independently, but to present collaboration, nodes are interconnected symmetrically with GPIOs presented in a Hardware reference section, in pairs
+There are 8 laboratory nodes. They can be used independently, but to present collaboration, nodes are interconnected symmetrically with GPIOs presented in a hardware reference section below
-  * node 1 with node 2,
-  * node 3 with node 4,
-  * node 5 with node 6,
-  * node 7 with node 8.
-<note tip>Nodes are interconnected in pairs: 1-2, 3-4, 5-6, 7-8. Scenarios for data transmission between MCUs require booking and the use of correct nodes for sending and receiving messages.</note>
 ===== Hardware reference =====
@@ Line 17: / Line 11: @@
 <figure sutavrlabimage1>
-<todo @pczekalski>Add figure</todo>
+{{ :en:multiasm:exercisesbook:avr:sut_avr_lab_node.png?600 |}}
 <caption>AVR (Arduino Uno) SUT Node</caption>
 </figure>
-<table tab_label>
+<table sutavrlabtable1>
 <caption>AVR (Arduino Uno) SUT Node Hardware Details</caption>
 ^ Component ID  ^ Component  ^ Hardware Details (controller)  ^ Control method  ^ GPIOs (as mapped to the Arduno Uno)  ^ Remarks  ^
+|               |            |                                |                 |                                      |          |
+|               |            |                                |                 |                                      |          |
 |               |            |                                |                 |                                      |          |
 </table>
+===== Communication =====
+Devices (laboratory nodes) are interconnected in pairs, so it is possible to work in groups and implement scenarios involving more than one device:
+  * node 1 with node 2,
+  * node 3 with node 4,
+  * node 5 with node 6,
+  * node 7 with node 8.
+Interconnections are symmetrical, so that device 1 can send data to device 2 and vice versa (similar to serial communication). Note that analogue inputs are also involved in the interconnection interface.
+See image {{ref>sutavrlabimage2}} for details.
+<figure sutavrlabimage2>
+{{ :en:multiasm:exercisesbook:avr:sutavrconnections.png?600 |}}
+<caption>SUT AVR nodes interconnection diagram</caption>
+</figure>
+The in-series resistors protect the outputs of the Arduino boards from excessive current when both pins are set as outputs with opposite logical states.
+The capacitors on the analogue lines filter the PWM signal, providing a stable voltage for measurement by the analogue-to-digital converter.
+<table sutavrconnections>
+<caption>AVR (Arduino Uno) SUT Node Interconnections</caption>
+^ Arduino Uno pin name  ^ AVR pin name  ^ Alternate function  ^ Comment                                  ^
+| D2                    | PD2           | INT0                | Interrupt input                          |
+| D5                    | PD5           | T1                  | Timer/counter input                      |
+| D6                    | PD6           | OC0A                | PWM output to generate analogue voltage  |
+| D9                    | PB1           | OC1A                | Digital output / Timer output            |
+| D10                   | PB2           | OC1B                | Digital output / Timer output            |
+| A5                    | PC5           | ADC5                | Analogue input                           |
+</table>
+Such a connection makes it possible to implement a variety of scenarios:
+  * Connection of OC0A to ADC5 allows you to generate a voltage for measuring on input 5 of the analogue-to-digital converter.
+  * Connection of OC1A to INT0 allows you to generate a digital periodic signal that can trigger hardware interrupts.
+  * Connection of OC1B to T1 allows you to generate a digital periodic signal, the pulse count of which can be counted using timer T1.
+<note tip>Nodes are interconnected in pairs: 1-2, 3-4, 5-6, 7-8. Scenarios for data transmission between MCUs require booking and the use of correct nodes for sending and receiving messages.</note>

en/multiasm/exercisesbook/avr/sut.1765540697.txt.gz · Last modified: 2025/12/12 11:58 by pczekalski