Arduino nano pinout gpio how to#
Arduino nano pinout gpio code#

0x04 is DDRB's I/O address when using the I/O specific commands Out 0x04, r24 // Store Register to I/O Location 0x04 Ldi r24, 0x3F // Load Immediate to Register r24

Arduino nano pinout gpio code#

The equivalent assembly code for any of the above lines will be : *(volatile uint8_t)0x24 = 0x3F // Address Dereferencing Method Arduino Pin Mapping with Atmega328p Programming Lab : Configuring as Output Example 1 : Configuring all the usable pins of Atmega328p's Port B as Output :ĭDRB = 0x3F // Using Hexadecimal Numbering SystemĭDRB = 0b0011 1111 // Using Binary Numbering System Let us look into the Schematics of Arduino UNO and see how the pins are mapped. In the Arduino UNO board, we can use all 8 pins effectively. So effectively we can use 6 Pins as GPIO. But in the Arduino UNO board PC6 is used for ~RESET (Reset Pin). So they are unusable and effectively we can use 6 Pins as GPIO. But in the Arduino UNO board, PB6 and PB7 are used for Crystal Oscillator. In our Arduino UNO board three (3) Ports are there in Atmega328p microcontroller : Port B, Port C, Port D. If PORTxn is written logic zero when the pin is configured as an output pin, the port pin is driven low (zero). If PORTxn is written logic one when the pin is configured as an output pin, the port pin is driven high (one). If DDxn is written logic zero, Pxn is configured as an input pin. If DDxn is written logic one, Pxn is configured as an output pin. The DDxn bit in the DDRx Register selects the direction of this pin. This will make things easy to start as no extra hardware is required. So let us start with the inbuilt LED in Arduino UNO.

The first program of embedded systems is usually the blinky program.

Arduino nano pinout gpio how to#

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