17-08-2021

Avr Software Uart In C

So recently I tried to implement Software UART (TX only) for the ATTiny85. C avr uart avr-gcc attiny. Improve this question. Follow edited Apr 2 '20 at 17:52. The UART module can easily be included in user's project by including the two files dbgputchar.c and dbgputchar.h. The file dbgputchar.h must be edited to select the UART TX pin and the UART baud rate. User then can call dbgputchar from its own code, as the example code in main.c does.

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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.

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.

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.

</div><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><div> Joined: Fri. Jul 7, 2006 </div><div><span>Posted <span> by shengchao</span>: </span><span>Thu. Jul 26, 2007 - 09:38 AM</span></div><h2 id='avr-software-uart-in-c-online'>Avr Software Uart In C Online</h2><label>Fivestar widget </label><div>Total votes: 0</div><p>Hi,</p><h2 id='avr-software-uart-in-c-tutorial'>Avr Software Uart In C Tutorial</h2><p>I'm trying to apply a software UART on my ATMEGA8 by refering to ATMEL Application Note:AVR305</p><p>the example code uses assembly language. So i written it as follow in ICCAVR</p><h2 id='avr-software-uart-in-c-program'>Avr Software Uart In C Program</h2><p>I'm having a compilation error that says</p><p>!ERROR file 'SW_UART.o': undefined symbol 'R16'</p><p>i check the SW_UART.s code, R16 point to the %tosend variable that i declared in C. So i try replacing the variable with a fix number.<br />e.g.</p><p>and my hyper terminal shows the correct output which is 5.</p><h2 id='avr-software-uart-in-c-download'>Avr Software Uart In C Download</h2><p>How can i solve this problem whereby this function will send any character that i pass to it in my main function which is written in C?</p><h2 id='avr-software-uart-in-c-code'>Avr Software Uart In C Code</h2><p>Thanks in advance !!</p></p>
																						
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