MikroElektronika PIC Microcontrollers PIC16 User Manual Page 155
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RS485 is a multipoint communication which allows multiple devices to be con-
nected to a single signal cable. mikroBasic provides a set of library routines to
provide you comfortable work with RS485 system using Master/Slave architec-
ture.
Master and Slave devices interchange packets of information, each of these pack-
ets containing synchronization bytes, CRC byte, address byte, and the data. In
Master/Slave architecture, Slave can never initiate communication. Each Slave has
its unique address and receives only the packets containing that particular address.
It is programmer's responsibility to ensure that only one device transmits data via
485 bus at a time.
Address 50 is a common address for all Slave devices: packets containing address
50 will be received by all Slaves. The only exceptions are Slaves with addresses
150 and 169, which require their particular address to be specified in the packet.
RS485 routines require USART module on port C. Pins of USART need to be
attached to RS485 interface transceiver, such as LTC485 or similar. Pins of trans-
ceiver (Receiver Output Enable and Driver Outputs Enable) should be connected
to port C, pin 2 (see the figure at end of the chapter).
Following routines implement flexible protocol for RS485 system with
Master/Slave architecture:
mikroBASIC
- Basic Compiler for Microchip PIC microcontrollers
150
mikroBASIC
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RS485 Library
sub procedure RS485master_init
sub procedure RS485slave_init(dim address as byte)
sub procedure RS485master_read(dim byref data as byte[5])
sub procedure RS485master_write(dim byref data as byte[2],
dim datalen as byte, dim address as byte)
sub procedure RS485slave_read(dim byref data as byte[5])
sub procedure RS485slave_write(dim byref data as byte[2],
dim datalen as byte)
Routines
Note
- MikroElektronika 1
- Table of Contents 2
- To readers note 5
- C H A P T E R 6
- CODE EDITOR 8
- Advanced Editor Features 9
- Comment / 10
- Uncomment Icon 10
- CODE EXPLORER 11
- CREATING FIRST PROJECT 12
- Compile Icon 15
- Debug Icon 15
- PROJECTS 18
- Managing Source Files 19
- Compile and Link Source Code 21
- DEBUGGER 22
- ERROR WINDOW 24
- ASSEMBLY VIEW 25
- STATISTICS 26
- Chapter 27
- Procedures (Details) Window 28
- INTEGRATED TOOLS 29
- KEYBOARD SHORTCUTS 31
- Reference 33
- IDENTIFIERS 34
- KEYWORDS 35
- DATA TYPES 36
- For example: 38
- Numerals 40
- Character Strings 40
- CONSTANTS 41
- VARIABLES 44
- Additional 45
- ' beginning of a module 46
- COMMENTS 48
- EXPRESSIONS 49
- DECLARATIONS AND STATEMENTS 51
- Statements 52
- DIRECTIVES 53
- ' byte at the same time 54
- ' example for P16F877A 54
- PROCEDURES AND FUNCTIONS 55
- ' some code 56
- ' routine 56
- ' case end 58
- Main Unit File 61
- Compiler 62
- Output Generator 62
- SCOPE (IDENTIFIER VISIBILITY) 63
- PROGRAM ORGANIZATION 65
- TYPE CONVERSION 67
- Example 1: 68
- Example 2: 69
- Example 3: 69
- ' B becomes $00ff 70
- ' B becomes -10 71
- ' C becomes 213 71
- 1 01 11 100 72
- 0 00 0 00 01 72
- 1 1 1 10000 72
- OPERATORS 78
- Runtime Behavior 80
- Arithmetic Operators 81
- Specific 83
- Boolean Operators 84
- Logical (Bitwise) Operators 85
- ' Bb becomes $00a0 86
- ' Bb becomes $70f4 86
- Overview 89
- Rules for 89
- Comparing 89
- Expressions 89
- CONDITIONAL STATEMENTS 92
- Select Case Statement 93
- If Statement 95
- Examples 96
- For Statement 98
- Do..Loop Until Statement 100
- While Statement 101
- ASM Statement 102
- PIC MCU SPECIFIC 103
- COMPILER ERROR MESSAGES 106
- Library Routines 109
- Built-in and 109
- BUILT-IN ROUTINES 110
- LIBRARY ROUTINES 112
- 1-Wire Library 113
- PIC16F877 115
- ADC Library 116
- Figure (ADC HW connection) 117
- CAN Library 118
- CAN_OP_MODE 124
- CAN_TX_MSG_FLAGS 124
- CAN_RX_MSG_FLAGS 125
- CAN_MASK 125
- CAN_FILTER 126
- CAN_CONFIG_FLAGS 126
- PCA82C250 129
- Shielded pair, less 129
- CANSPI Library 130
- CAN Library Constants 136
- Compact Flash Library 139
- Compact Flash Connector 144
- (TOP VIEW) 144
- Compact Flash Card 144
- EEPROM Library 145
- I2C Library 146
- LCD Library 150
- Commands 151
- Figure: LCD HW connection 152
- PWM Library 153
- Figure: PWM demonstration 154
- RS485 Library 155
- RS485slave_write 158
- Connecting PC and PIC via 160
- RS485 communication line 160
- SPI Library 161
- Value Meaning 163
- 8. 8. 8. 8. 8. 8. 8. 8 165
- USART Library 166
- Figure: RS232 HW connection 168
- Numeric Formatting Routines 169
- Utilities 171
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