User manual

mikroPascal PRO for dsPIC30/33 and PIC24
MikroElektronika
440
Library Dependency Tree
The following variable must be dened
in all projects using RS-485 Library:
Description: Example:
var RS485_rxtx_pin : sbit; sfr;
external;
Control RS-485 Transmit/Receive
operation mode
var RS485_rxtx_pin : sbit at RF2_
bit;
var RS485_rxtx_pin_direction :
sbit; sfr; external;
Direction of the RS-485 Transmit/
Receive pin
var RS485_rxtx_pin_direction : sbit
at TRISF2_bit;
External dependencies of RS-485 Library
Library Routines
- RS485Master_Init
- RS485Master_Receive
- RS485Master_Send
- RS485Slave_Init
- RS485Slave_Receive
- RS485Slave_Send
RS485Master_Init
Prototype
procedure RS485Master_Init();
Description Initializes MCU as a Master for RS-485 communication.
Parameters None.
Returns Nothing.
Requires Global variables:
- RS485_rxtx_pin - this pin is connected to RE/DE input of RS-485 transceiver(see schematic at the
bottom of this page). RE/DE signal controls RS-485 transceiver operation mode.
- RS485_rxtx_pin_direction - direction of the RS-485 Transmit/Receive pin.
must be dened before using this routine.
UART HW module needs to be initialized. See UARTx_Init.
Example
// RS485 module pinout
var RS485_rxtx_pin : sbit at RF2_bit;
var RS485_rxtx_pin_direction : sbit at TRISF2_bit;
// End of RS485 module pinout
...
UART1_Init(9600); // initialize UART1 module
RS485Master_Init(); // intialize MCU as a Master
for RS-485 communication
Notes None