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--- en:multiasm:exercisesbook:avr:sut [2026/03/25 12:23] – pczekalski
+++ en:multiasm:exercisesbook:avr:sut [2026/03/25 12:50] (current) – [Table] pczekalski
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+====== SUT AVR Assembler Laboratory Node Hardware Reference ======
+===== Introduction =====
+Each laboratory node is equipped with an Arduino Uno R3 development board, based on the ATmega328P MCU. It also has two extension boards:
+  * external, analogue and digital communication board,
+  * user interface board presented on the image {{ref>sutavrlabimage1}}.
+There are 10 laboratory nodes. They can be used independently, but for collaboration, nodes are interconnected symmetrically, with GPIOs described in the hardware reference section below.
+===== Hardware reference =====
+The table {{ref>sutavrlabtable1}} lists all hardware components and details. Note that some elements are accessible, but their use is not supported via the remote lab, e.g., buttons and a buzzer.\\ The node is depicted in the figure {{ref>sutavrlabimage1}} and its interface visual schematic is presented in the figure {{ref>sutavrlabimage1_2}}. The schematic presents only components used in scenarios and accessible via the VREL NextGen environment (controllable and observable via video stream), omitting unused components such as buttons, a buzzer, and a potentiometer.
+<figure sutavrlabimage1>
+{{ :en:multiasm:exercisesbook:avr:sut_avr_lab_node.png?600 |}}
+<caption>AVR (Arduino Uno) SUT Node</caption>
+</figure>
+<figure sutavrlabimage1_2>
+{{ :en:multiasm:exercisesbook:avr:untitled.png?600 |}}
+<caption>SUT node's visual interface components schematic</caption>
+</figure>
+<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                                          ^
+| D1            | LED (red)             | direct via GPIO                      | binary (0->on, 1->off)                     | GPIO13                                                                                                                                                         |                                                  |
+| D2            | LED (red)             | direct via GPIO                      | binary (0->on, 1->off)                     | GPIO12                                                                                                                                                         |                                                  |
+| D3            | LED (red)             | direct via GPIO                      | binary (0->on, 1->off)                     | GPIO11                                                                                                                                                         |                                                  |
+| D4            | LED (red)             | direct via GPIO                      | binary (0->on, 1->off)                     | GPIO10                                                                                                                                                         | shared with interconnection with another module  |
+| LED4          | 4x 7-segment display  | indirect, via two 74HC575 registers  | serial load to 2 registers, daisy-chained  | GPIO8 - serial input of the controller\\ GPIO7 - shift data internally, raising edge (write next bit and shift data in serial)\\ GPIO4 - reset display buffer  |                                                  |
+</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,
+  * node 9 with node 10.
+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 Arduino boards' outputs from excessive current when both pins are configured as outputs with opposite logic states.
+The capacitors on the analogue lines filter the PWM signal, providing a stable voltage for the analogue-to-digital converter to measure.
+<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, 9-10. 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.txt · Last modified: 2026/03/25 12:50 by pczekalski