Mikroelektronika MIKROE-738 Datenbogen

mikroC PRO for PIC32

MikroElektronika

407

RS485Master_Receive

RS485Master_Send

void RS485Master_Receive(char *data_buffer);

Description Receives messages from Slaves. Messages are multi-byte, so this routine must be called for each 

byte received. 

Parameters - 

data_buffer

: 7 byte buffer for storing received data. Data will be stored in the following manner: 

- 

data_buffer[0..2]

: message content 

- 

data_buffer[3]

: number of message bytes received, 1–3 

- 

data_buffer[4]

: is set to 255 when message is received 

- 

data_buffer[5]

: is set to 255 if error has occurred 

- 

data_buffer[6]

: address of the Slave which sent the message 

The routine automatically adjusts 

data[4]

 and 

data[5]

 upon every received message. These flags 

need to be cleared by software.

Nothing.

MCU must be initialized as a Master for RS-485 communication. See RS485Master_Init.

char msg[8];

...

RS485Master_Receive(msg);

None

void  RS485Master_Send(char  *data_buffer,  char  datalen,  char  slave_

address);

Description Sends message to Slave(s). Message format can be found at the bottom of this page.
Parameters - 

data_buffer

: data to be sent 

- 

datalen

: number of bytes for transmition. Valid values: 0...3. 

- 

slave_address

: Slave(s) address

Nothing.

MCU must be initialized as a Master for RS-485 communication. See RS485Master_Init.

It is the user’s responsibility to ensure (by protocol) that only one device sends data via 485 bus at a 

time.

char msg[8];

...

RS485Master_Send(msg, 3, 0x12);

None