Avr Software Uart In C

The microcontroller PIC16F84A has no hardware UART module, but we can use software UART to send/receive data to/from the PC via RS232 cable (COM port). This topic shows a simple example for the use of the UART protocol with the PIC16F84A MCU.

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Avr Software Uart In C Program

AN1451 - AVR306: Using the AVR UART in C on tinyAVR and megaAVR devices 207KB. AN42787 - AVR42787: AVR Software User Guide 363KB. AN8014 - AVR135: Using Timer Capture to Measure PWM Duty Cycle on tinyAVR and megaAVR devices. IAR Embedded Workbench for AVR is a complete set of powerful C/C development tools with extensive support for. Feb 02, 2011 Software UART implementation for the AVR platform. Contribute to blalor/avr-softuart development by creating an account on GitHub. The objective of all this is to get a command-line interface through an RS232 serial port on an AVR. I'm experimenting with things that resemble POTS modems in. Writing a AVR Software UART. Hello Guys, Myself and a friend have been engaged in a personal project where we are utilising a ATmega32a to eventually control.

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Hardware Required:

PIC16F84A microcontroller
8MHz crystal
2 x 22pF ceramic capacitors
10K ohm resistor
MAX232 — datasheet
4 x 10uF polarized capacitor
Female RS232 connector
Breadboard
5V power source
Jumper wires

UART Example for PIC16F84A microcontroller circuit:

To interface the PIC16F84A MCU with the PC we need MAX232 signal level converter as shown in the circuit diagram. There are 2 lines between the PIC16F84A and the MAX232 and also two lines between the MAX232 and the female COM connector. One line for data transmit and the other one for data receive.
The female COM connector is connected to the PC using RS232 cable, this cable has to be male-female because the PC RS232 port type is male.
In this example the PIC16F84A MCU runs with 8MHz crystal oscillator.

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UART Example for PIC16F84A microcontroller C code:
The function #use rs232(xmit = PIN_B4, rcv = PIN_B5, baud = 2400) is used to configure the UART protocol. Here software UART is used.
where:
xmit is the transmit pin (RB4)
rcv is the receive pin (RB5)
2400 is the baud rate.
The functions used in the C code are:
printf: sends a string of characters over RS232 transmission pin (TX).
putc: send a character over RS232 transmission pin (TX).
getc(): read character if available.
Complete C code for CCS C compiler is below.

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</div><h2 id='avr-software-uart-in-c-program'>Avr Software Uart In C Program</h2><table><tbody><tr><td><div><div>2</div><div>4</div><div>6</div><div>8</div><div>10</div><div>12</div><div>14</div><div>16</div><div>18</div><div>20</div><div>22</div><div>24</div><div>26</div><div>28</div><div>30</div><div>32</div><div>34</div><div>36</div></div></td><td><div><div><span>#fuses HS, NOWDT, PUT, NOPROTECT</span></div><div><span>#use fast_io(B)</span></div><div><span>#use rs232(xmit = PIN_B4, rcv = PIN_B5, baud = 2400)</span></div><div><span>const</span><span>char</span><span>message</span><span>[</span><span>]</span><span>=</span><span>'***** PIC16F84A microcontroller UART example *****'</span><span>;</span></div><div><span>void</span><span>main</span><span>(</span><span>)</span><span>{</span></div><div><span>delay_ms</span><span>(</span><span>2000</span><span>)</span><span>;</span><span>// Wait 2 seconds</span></div><div><span>// Print text</span></div><div><span>printf</span><span>(</span><span>'nr'</span><span>)</span><span>;</span><span>// Start new line</span></div><div><span>while</span><span>(</span><span>message</span><span>[</span><span>i</span><span>]</span><span>!=</span><span>'0'</span><span>)</span><span>{</span><span>// Loop until the end of the string</span></div><div><span>delay_ms</span><span>(</span><span>100</span><span>)</span><span>;</span><span>// Wait 100 ms</span></div><div><span>}</span></div><div><span>printf</span><span>(</span><span>'nr'</span><span>)</span><span>;</span><span>// Start new line</span></div><div><span>printf</span><span>(</span><span>'%unr'</span><span>,</span><span>i</span><span>)</span><span>;</span><span>// Print i and start new line</span></div><div><span>}</span></div><div><span>// Receive and send character via UART</span></div><div><span>j</span><span>=</span><span>getc</span><span>(</span><span>)</span><span>;</span><span>// UART read character</span></div><div><span>}</span></div></div></td></tr></tbody></table></p>
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