pc/cp 364- serial communication-uartdenethor.wlu.ca/pc364/uartbeam.pdf · 2016-12-15 · arduino...

Serial Communication -UARTArduino Serial Library

PC/CP 364Serial Communication-UART

Terry Sturtevant

Wilfrid Laurier University

December 15, 2016

Terry Sturtevant PC/CP 364 Serial Communication-UART

Baud rate calculationRS232 communication

Serial Communication -UART

Universal Asynchronous Receiver TransmitterSimplest form of serial communicationBetween 2 devicesUses 2 signals (and Ground), Rx and TxAsynchronous, so both must agree on baud rate

Universal Asynchronous Receiver Transmitter

Simplest form of serial communicationBetween 2 devicesUses 2 signals (and Ground), Rx and TxAsynchronous, so both must agree on baud rate

Universal Asynchronous Receiver TransmitterSimplest form of serial communication

Between 2 devicesUses 2 signals (and Ground), Rx and TxAsynchronous, so both must agree on baud rate

Universal Asynchronous Receiver TransmitterSimplest form of serial communicationBetween 2 devices

Uses 2 signals (and Ground), Rx and TxAsynchronous, so both must agree on baud rate

Universal Asynchronous Receiver TransmitterSimplest form of serial communicationBetween 2 devicesUses 2 signals (and Ground), Rx and Tx

Asynchronous, so both must agree on baud rate

Universal Asynchronous Receiver TransmitterSimplest form of serial communicationBetween 2 devicesUses 2 signals (and Ground), Rx and TxAsynchronous, so both must agree on baud rate

Communication parameters

1 Start bit at “0” levelLSB transmitted firstCan have odd, even, or no parity bit1 or 2 Stop bits at “1” level

Since start and stop bits are opposite, new characters can alwaysbe detected.

1 Start bit at “0” level

LSB transmitted firstCan have odd, even, or no parity bit1 or 2 Stop bits at “1” level

1 Start bit at “0” levelLSB transmitted first

Can have odd, even, or no parity bit1 or 2 Stop bits at “1” level

1 Start bit at “0” levelLSB transmitted firstCan have odd, even, or no parity bit

1 or 2 Stop bits at “1” level

1 1 1 0

1 2 3 4

1 1 1 0 0

1 2 3 4 5

1 1 1 0 0 1

1 2 3 4 5 6

1 1 1 0 0 1 1

1 2 3 4 5 6 7

1 1 1 0 0 1 1 0

Start Stop

1 2 3 4 5 6 7

1 1 1 0 0 1 1 0

Start Stop

1 2 3 4 5 6 7

1 1 1 0 0 1 1 0

UART no parity - 01100111

Start Stop

Parity0 1 2 3 4 5 6 7

UART even parity

Start Stop

Parity0 1 2 3 4 5 6 7

UART even parity

Start Stop

Parity0 1 2 3 4 5 6 7

UART odd parity

Baud rate calculation

Baud rate is the number of bits possible in a seconde.g. 9600 baud → 1 bit takes 1

9600 secondAfter start bit is detected, wait time for 11

2 bit to testfor first data bit and then after every 1 bit intervalResetting at the start bit allows some clock variation

Baud rate is the number of bits possible in a second

e.g. 9600 baud → 1 bit takes 19600 second

After start bit is detected, wait time for 112 bit to test

for first data bit and then after every 1 bit intervalResetting at the start bit allows some clock variation

9600 second

After start bit is detected, wait time for 112 bit to test

for first data bit and then after every 1 bit intervalResetting at the start bit allows some clock variation

2 bit to testfor first data bit and then after every 1 bit interval

Resetting at the start bit allows some clock variation

2 bit to testfor first data bit and then after every 1 bit intervalResetting at the start bit allows some clock variation

0 1 2 3

1 1 1 0

0 1 2 3 4

1 1 1 0 0

0 1 2 3 4 5

1 1 1 0 0 1

0 1 2 3 4 5 6

1 1 1 0 0 1 1

0 1 2 3 4 5 6 7

1 1 1 0 0 1 1 0

Start Stop

0 1 2 3 4 5 6 7

1 1 1 0 0 1 1 0

Start Stop

0 1 2 3 4 5 6 7

1 1 1 0 0 1 1 0

Bit timing

RS232 communication

Voltages are inverted±3→ ±12Zero is not a valid voltageMark level (inactive/1) is a negative voltageSpace level (active/0) is a positive voltage

RS232 communication

Voltages are inverted

±3→ ±12Zero is not a valid voltageMark level (inactive/1) is a negative voltageSpace level (active/0) is a positive voltage

RS232 communication

Voltages are inverted±3→ ±12

Zero is not a valid voltageMark level (inactive/1) is a negative voltageSpace level (active/0) is a positive voltage

RS232 communication

Voltages are inverted±3→ ±12Zero is not a valid voltage

Mark level (inactive/1) is a negative voltageSpace level (active/0) is a positive voltage

RS232 communication

Voltages are inverted±3→ ±12Zero is not a valid voltageMark level (inactive/1) is a negative voltage

Space level (active/0) is a positive voltage

RS232 communication

Voltages are inverted±3→ ±12Zero is not a valid voltageMark level (inactive/1) is a negative voltageSpace level (active/0) is a positive voltage

ParityMark 0 1 2 3 4 5 6 7

ParityMark

0 1 2 3 4 5 6 7

Start Stop

ParityMark

0 1 2 3 4 5 6 7

Start Stop

ParityMark

0 1 2 3 4 5 6 7

RS232 levels

Arduino Serial

Serial.begin(9600)start port and set baudratewhile(!Serial)wait to connectif (Serial.available() > 0)returns True if data available, False if not

Arduino Serial

Serial.begin(9600)start port and set baudrate

while(!Serial)wait to connectif (Serial.available() > 0)returns True if data available, False if not

Arduino Serial

Serial.begin(9600)start port and set baudratewhile(!Serial)wait to connect

if (Serial.available() > 0)returns True if data available, False if not

Arduino Serial

Serial.begin(9600)start port and set baudratewhile(!Serial)wait to connectif (Serial.available() > 0)returns True if data available, False if not

Arduino Serial (continued)

Serial.write(value)write valueSerial.print(’A’)write string as ASCIIinByte = Serial.read()read byteSerial.end()close port

Serial.write(value)write value

Serial.print(’A’)write string as ASCIIinByte = Serial.read()read byteSerial.end()close port

Serial.write(value)write valueSerial.print(’A’)write string as ASCII

inByte = Serial.read()read byteSerial.end()close port

Serial.write(value)write valueSerial.print(’A’)write string as ASCIIinByte = Serial.read()read byte

Serial.end()close port

Serial.write(value)write valueSerial.print(’A’)write string as ASCIIinByte = Serial.read()read byteSerial.end()close port

Arduino Serial sample code

v o i d s e t u p ( ) {S e r i a l . b e g i n ( 9 6 0 0 ) ;w h i l e ( ! S e r i a l ) {

v o i d l o o p ( ) {i f ( S e r i a l . a v a i l a b l e ( ) > 0) {

i n B y t e = S e r i a l . r e a d ( ) ;S e r i a l . w r i t e ( i n B y t e ) ;}

Arduino Serial sample code

v o i d s e t u p ( ) {S e r i a l . b e g i n ( 9 6 0 0 ) ;w h i l e ( ! S e r i a l ) {

v o i d l o o p ( ) {i f ( S e r i a l . a v a i l a b l e ( ) > 0) {

i n B y t e = S e r i a l . r e a d ( ) ;S e r i a l . w r i t e ( i n B y t e ) ;}

pc/cp 364- serial communication-uartdenethor.wlu.ca/pc364/uartbeam.pdf · 2016-12-15 · arduino...

Documents

installing the cisco asa 5505 · step 2 before connecting a...

hdmi da series - extron...control/remote serial control port...

jacques baud - dia

flextm link serial cables - global caché€¦ · ·...

dnp 3.0 serial (rs232/rs485) and ethernet (tcp/ip) or...

cme137686lx cpumodules™€¦ · update serial port...

cse 477serial communication1 zrs-232 (standard serial line)...

robonova 1. hardware capabilities mr-3024c microcontroller ...

lampiran -...

gsi online for leica tps - ulisboa · gsi online for leica...

usr-dr302 user manual file version: v1.0...

bascom-8051 language reference - wordpress.com · $baud...

ni days 2014 (ch) - · pdf filedimep 1995 deco cn 2005 baud...

trueport windows user guide -...

62-0290-01 - web-5r-ax · four rs-485 half-duplex serial...

900 mhz ethernet and serial module · ethernet data...

a31 dal serial a it 12or s - maxim integrateda phase-locked...

sl144 communications protocol - welcome to … get the...

rl78/g10 application note serial array unit (baud rate

operator's guide - stat technologies...4 dca vantage...