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Selection for MODBUS ADDRESS and MODBUS_SERIAL_BAUD

 
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paddy



Joined: 04 Nov 2012
Posts: 15

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Selection for MODBUS ADDRESS and MODBUS_SERIAL_BAUD
PostPosted: Thu Sep 18, 2014 2:37 am     Reply with quote
Hi,

I am using ex_modbus_slave.c file of CCS compiler version 4.119. The code working fine. But I need to provide the selection of Baud rates for communication. Instead of fixed baud rate I need flexible baud rates which can be selected by end user.

Code:

/////////////////     Setting Modbus parameters      ////////////////////

/////////////////////////////////////////////////////////////////////////

#define MODBUS_TYPE                       MODBUS_TYPE_SLAVE       
#define MODBUS_SERIAL_TYPE                MODBUS_RTU           
#define MODBUS_SERIAL_INT_SOURCE          MODBUS_INT_RDA             
#define MODBUS_SERIAL_RX_BUFFER_SIZE      64               
//#define MODBUS_SERIAL_BAUD              9600                     
#define MODBUS_SERIAL_RX_PIN              PIN_C7                 
#define MODBUS_SERIAL_TX_PIN              PIN_C6                   
#define MODBUS_SERIAL_ENABLE_PIN          Pin_C5               
#define MODBUS_SERIAL_RX_ENABLE           Pin_C5                 

#include <modbus.c>

#define MODBUS_ADDRESS       Channel_No   
#define MODBUS_SERIAL_BAUD   Baud_Rate     




It gives duplicate define warning. Please advise how to assign multiple baud rate options in this code.

Thanks,
Paddy
Ttelmah



Joined: 11 Mar 2010
Posts: 19540

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PostPosted: Thu Sep 18, 2014 2:57 am     Reply with quote
You don't directly.

You build the code to handle one rate (19200bps, or 9600bps say).
Then use the 'set_uart_speed' command to select the rate you actually want to run.

So you have a command from the keyboard, or an external DIP switch (for example), that chooses from perhaps four rates, and then just call set_uart_speed(xxxx), to chose the rate.
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