Embedded System Microcontroller Interactive Course using BASCOM-AVR - Lecture10
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Embedded System Microcontroller Interactive Course using BASCOM-AVR - Lecture10 By: WALID BALID
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Embedded System Microcontroller Interactive Course using BASCOM-AVR - Lecture10
- 1. ﺍﻟﺘﺠﺎﺭﺏ ﺍﻟﻌﻤﻠﻴﺔ Programming Embedded Systems Microcontroller You Can Practice Microcontroller Programming Easily Now! WALID BALID, Tuesday, December 15, 2009
- 2. Practical Class 10 Programming Microcontrollers Exp.28:Serial Communications RS485 RS485 RS485 RS485 RS485 A,B VA>VB “1” VA<VB “1”“0” RS485 B A RS485 RS485 ST TI MAXIM LTC ST485 SN75176 MAX485 LTC485 :RS485 Faculty of Electrical and Electronic Eng. 213 Automatic Control & Automation Dept.
- 3. RS485 SPECIFICATIONS RS232 RS423 RS422 RS485 Mode of Operation SINGLE-ENDED SINGLE-ENDED Differential Differential Total Number of Drivers and 1DRIVER 1DRIVER 1DRIVER 32DRIVER Receivers on One Line 1RECVR 10RECVR 10RECVR 32RECVR Maximum Cable Length 50 FT 4000 FT 4000 FT 4000 FT 10Mb/s 10Mb/s Maximum Data Rate 20kb/s 100kb/s 100Kb/s 100Kb/s Maximum Driver Output Voltage ±25V ±6V -0.25V to +6V -7V to +12V Driver Output Signal Loaded ±5V to ±15V ±3.6V ±2.0V ±1.5V Level (Loaded Min.) Driver Output Signal Unloaded ±25V ±6V ±6V ±6V Level (Unloaded Max) Driver Load Impedance (Ohms) 3k to 7k >=450 100 54 Max. Driver Current in Power On N/A N/A N/A ±100uA High Z State Max. Driver Current in Power Off ±6mA @ ±2v ±100uA ±100uA ±100uA High Z State Slew Rate (Max.) 30V/µS Adjustable N/A N/A Receiver Input Voltage Range ±15V ±12V -10V to +10V -7V to +12V Receiver Input Sensitivity ±3V ±200mV ±200mV ±200mV Receiver Input Resistance (Ohms) 3k to 7k 4k min 4k min >=12k RS485 214
- 4. Practical Class 10 Programming Microcontrollers RS485 B A 15Meter Backbone with StubsDaisy Chain RS485 Faculty of Electrical and Electronic Eng. 215 Automatic Control & Automation Dept.
- 5. RS485 PASSIVE DUPLEX CONTROL (AUTOMATIC ) ü ACTIVE DUPLEX CONTROL (RTS Pin ) ü RS485 RO, DI Passive Duplex ü DE/RE Driver No data to send § “1” Idle Master sends a request § Start Bit Stop Bit Check sum Idle 216
- 6. Practical Class 10 Programming Microcontrollers Slave sends a response § add = 07 RS485 Driver Active Duplex ü RTS Control No data to send § RTS “1” Master sends a request § Start Bit Stop Bit Check sum Idle Faculty of Electrical and Electronic Eng. 217 Automatic Control & Automation Dept.
- 7. Slave sends a response add = 07 RS232 Advantages Disadvantages ü System-to-System × Chip-2-Chip 1200 ü .Chip-2-Sensor 100kb/s RS485<>TTL × ü ü :RS485MODBUS MODEBUS Multi Master/Slave Master Device MODEBUS Slave Device Slave DeviceMaster DeviceQueryMODEBUS Slave Function Start Start Byte Count Data CRC Address Code Address Hi Address Lo 218
- 8. Practical Class 10 Programming Microcontrollers Slave Function Byte Start Data CRC Address Code Count Address Stream CRC Low CRC Hi 1 byte 1 byte 1 byte 2 byte 0 ~ 252 byte 1~2 byte 1~252Slave Address • Function code • Byte Count • Start Address • 255 byte maxData Stream • Cyclic Redundancy CheckCRC • Inter-frame-time t3.5 Data t1.5 Inter-character time-out (t1.5) = 750μs Inter-frame delay (t3.5) = 1.750ms Faculty of Electrical and Electronic Eng. 219 Automatic Control & Automation Dept.
- 9. 70Byte9600bps Slave address 70 ×8 = 560 × 1000 = . 58ms .t3.5= 1.75ms Start Master Set Control Pin Waitms 10 Send Data Frame Reset Control Pin Waitms 100 End 220
- 10. Practical Class 10 Programming Microcontrollers Start Slave NO UART INT Yes Byte1 is Disable UART Slave ADD Wait 90ms NO Yes Get the data at the 90ms Passed? UART Interface (MSB First, LSB Last ) Yes Enable UART NO Check Count Check CRC Programming YES OK Ignore Data Set Data Value End MasterSlaveResponceMODEBUS Slave Slave Function Byte CRC Address Code Count CRC Low CRC Hi 1 byte 1 byte 1 byte 1~2 byte Slave CRC Faculty of Electrical and Electronic Eng. 221 Automatic Control & Automation Dept.
- 11. RS485| Full-DuplexHalf-DuplexRS485 RS485 222
- 12. Practical Class 10 Programming Microcontrollers UART<>RS458 Max485 Config Print0 = Porte.2 , Mode = Set .RS485 “DE”“1”Config Print0 “0”“DE” “DE” Faculty of Electrical and Electronic Eng. 223 Automatic Control & Automation Dept.
- 13. Microcontroller is Master, PC is Slave $regfile = "m128def.dat" $crystal = 8000000 $baud = 9600 '------------------ Config Print0 = Porte.2 , Mode = Set Config Pine.2 = Output DE Config Pine.4 = Input Key1 Alias Pine.4 Porte.4 = 1 '------------------ Dim Msg As String * 100 '------------------ Do Debounce Key1 , 0 , Sendall , Sub Loop End '------------------ Sendall: Print "This is RS485 Test Program" Print "RS458 Protocol Done Based-on MAX485" Print "University of Aleppo - Syria" Print "Faculty of Alectrical & Electronic Engineering" Print "Control Department" Print "Fourth Year Students" Print "Computer Aided Design Session" Print "Unfutunality This Was The Last Session Lab" Print "2nd Semester" Print "See You Next Semester Guys ;)" Print "Kindest Regards" Print "Walid BALID" Print ":) :) :) :) :) :) :) :) :) :) :) :)" Wait 1 Return 224
- 14. Practical Class 10 Programming Microcontrollers Microcontroller is Slave, PC is Master $regfile = "m128def.dat" $crystal = 8000000 $baud = 9600 '------------------------- DE Config Porte.2 = Output Config Print = Porte.2 , Mode = Reset Open "comd.3:9600,8,n,1" For Output As #1 UART Open "comd.2:9600,8,n,1" For Input As #2 Config Serialin = Buffered , Size = 250 Enable Interrupts '------------------------- Dim Msg As String * 250 '------------------------ Do If Ischarwaiting() = 1 Then Input Msg UART Print #1 , Msg End If Loop UART End Faculty of Electrical and Electronic Eng. 225 Automatic Control & Automation Dept.
- 15. RS232<>RS458 RS232<>RS458 RS232<>RS458 226
- 16. Practical Class 10 Programming Microcontrollers RS232<>UART<>RS458 RS232<>UART<>RS458 Max232 UART Max485 UART RS232<>UART<>RS458 Faculty of Electrical and Electronic Eng. 227 Automatic Control & Automation Dept.
- 17. Exp.29:Serial Communications USB USB USB USB USB USB 480Mb/s ü . Plug & Play ü ü 127 ü :USB USB 1.0 & USB 1.1 & USB 2.0& USB 3.0USB USB 1.01.5 Mbits/s Low Speed § USB 1.112 Mbits/s Full Speed § .USB 2.0480 Mbits/s High Speed § .USB 3.04800 Mbits/s § USB ”Host Controlled” USB ) USB 228
- 18. Practical Class 10 Programming Microcontrollers ”On-The-Go” USB ü ü HUB USB Plug& Play Plug & Play USB USB VID, PID USB Faculty of Electrical and Electronic Eng. 229 Automatic Control & Automation Dept.
- 19. USB USB A § B § D- & D++5v & GNDUSB VCC1 D-2 D+3 GND4 '1' D+&D- USB D- '0' D+ '1' :(Non Return to Zero Invert) NRZI NRZIUSB '0' '1''0' '1' '1' 230
- 20. Practical Class 10 Programming Microcontrollers USB D- D+ D- .1 D+ .2 .3 USB USB USB USB Device USB USB Function Host Controller IC USB USB USBUSB Function USB Function Endpoint EndpointUSB Function InOut Faculty of Electrical and Electronic Eng. 231 Automatic Control & Automation Dept.
- 21. USB EP2 In USB Function USB1 EP1 In [Addr : 2] [Endpoint : EP1] [In] USB1 PipePipe EP0 In & EP0 Out Pipe0 Pipe Pipe Control Transfers § 232
- 22. Practical Class 10 Programming Microcontrollers Interrupt Transfers § Isochronous Transfers § Bulk Transfers § USB Frame USB 1ms USB1.1, USB2.0 125µs Transaction Token Packet In Token Synchronization .1 Packet Identity PID .2 128Address .3 Endpoint .4 5Cyclic Redundancy CheckCRC .5 Out Token In Token Control Transfer : Setup Token In Token Faculty of Electrical and Electronic Eng. 233 Automatic Control & Automation Dept.
- 23. 1ms±500ns: Start of frame Token 11Frame number Data Packet Data0 .1 Data1 .2 16bitCRC1024bit Handshake Packet Acknowledge Not acknowledge Stall 234
- 24. Practical Class 10 Programming Microcontrollers USB USB USB USBHardware .1 . .2 USB USB UARTUSB USB FT232 FTDIUSB<>UART HardwareUSB USB D2XX driver & VCP driver .COM Faculty of Electrical and Electronic Eng. 235 Automatic Control & Automation Dept.
- 25. D2XX driver & VCP driver D2XX.DLL Driver VCP Driver 3MB 300 KB/s Com USB :(Virtual Com Port) VCP ComUSB :D2XX.DLL DLL FT232BM ü VCP& D2XX.DLLFTDI ü USB1.1, USB2.0 ü ü 300kb~2Mb ü 384FIFO ü 128FIFO ü VID, PID ü ü USBUSB USB USB 236
- 26. Practical Class 10 Programming Microcontrollers 11 PWREN# Faculty of Electrical and Electronic Eng. 237 Automatic Control & Automation Dept.
- 27. 3ms Sleep mode Sleep=”1” Wake up USB Serial Interface EngineSIE USBUSB § CRC § Start Of Packet, End Of Packet, Resume, Reset § NRZI § PID § USB1.1USB Transceiver D+ USB2.0, FT232BM 6MHz48MHz EEPROM PID, VID 238
- 28. Practical Class 10 Programming Microcontrollers RS232<>UART<>USB RS232<>UART<>USB Faculty of Electrical and Electronic Eng. 239 Automatic Control & Automation Dept.