Mikroelektronika MIKROE-350 Fiche De Données
RS485Master_Init
327
MIKROELEKTRONIKA
- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD
Libraries
mikroBasic PRO for AVR
CHAPTER 6
Prototype
sub procedure RS485Master_Init()
Returns
Nothing.
Description
Initializes MCU as a Master for RS-485 communication.
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.
RS-485 transceiver operation mode.
-
RS485_rxtx_pin_direction
- direction of the RS-485 Transmit/Receive pin
must be defined before using this function.
UART HW module needs to be initialized. See UARTx_Init.
Example
' RS485 module pinout
dim RS485_rxtx_pin as sbit at PORTD.B2
dim RS485_rxtx_pin_direction as sbit at DDRD.B2
' End of RS485 module pinout
dim RS485_rxtx_pin as sbit at PORTD.B2
dim RS485_rxtx_pin_direction as sbit at DDRD.B2
' End of RS485 module pinout
' Pass pointers to UART functions of used UART module
UART_Wr_Ptr = @UART1_Write
UART_Rd_Ptr = @UART1_Read
UART_Rdy_Ptr = @UART1_Data_Ready
UART_TX_Idle_Ptr = @UART1_TX_Idle
UART_Wr_Ptr = @UART1_Write
UART_Rd_Ptr = @UART1_Read
UART_Rdy_Ptr = @UART1_Data_Ready
UART_TX_Idle_Ptr = @UART1_TX_Idle
...
UART1_Init(9600) ' initialize UART module
RS485Master_Init() ' intialize MCU as a Master
for RS-485 communication
UART1_Init(9600) ' initialize UART module
RS485Master_Init() ' intialize MCU as a Master
for RS-485 communication