mikroC

mikroC - C Compiler for Microchip PIC microcontrollers

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RS485Master_Init

Prototype

void RS485Master_Init(void);

Description Initializes PIC MCU as Master in RS-485 communication.

Requires USART HW module needs to be initialized. See USART_Init.

Example RS485Master_Init();

RS485Master_Receive

Prototype

void RS485Master_Receive(char *data);

 

 

Description

Receives any message sent by Slaves. Messages are multi-byte, so this function must be

 

called for each byte received (see the example at the end of the chapter). Upon receiving

 

a message, buffer is filled with the following values:

 

data[0..2] is the message,

 

data[3] is number of message bytes received, 1–3,

 

data[4] is set to 255 when message is received,

 

data[5] is set to 255 if error has occurred,

 

data[6] is the address of the Slave which sent the message.

 

Function automatically adjusts data[4] and data[5] upon every received message.

 

These flags need to be cleared from the program.

 

 

Requires

MCU must be initialized as Master in RS-485 communication in order to be assigned an

 

address. See RS485Master_Init.

 

 

Example

unsigned short msg[8];

 

...

 

RS485Master_Receive(msg);

 

 

page

 

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