modbus.h File Reference

Modbus serial library. More...

#include <stdint.h>

Go to the source code of this file.

Functions
void	modbus_init (uint8_t address)
uint8_t	modbus_analyse_and_answer (void)
void	modbus_send (uint8_t length)
void	modbus_char_recvd (void)
void	modbus_timer (void)

Variables
uint8_t	modbusAddress
uint16_t	input_registers [2]
uint16_t	holding_registers [2]

Detailed Description

Modbus serial library.

Definition in file modbus.h.

Function Documentation

modbus_analyse_and_answer()

uint8_t modbus_analyse_and_answer

(

void

)

Analyses the received frame and answer to server

Returns

an error code if frame not valid

Definition at line 40 of file modbus.c.

modbus_char_recvd()

void modbus_char_recvd

(

void

)

This function will be called every time a character has been received on the Modbus serial port. It is called from the interrupt hander.

Parameters

c	: the received char // removed !

See also

interrupts.c.

Definition at line 85 of file modbus.c.

modbus_init()

void modbus_init

(

uint8_t

address

)

Initializes this Modbus library.

Initialize pins, timer, serial port and variables. Interrupts MUST be initialized for the timer and the serial port.

Parameters

address

: the Modbus address of this device

See also

modbus_char_recvd

modbus_timer

interrupts.c

Definition at line 108 of file modbus.c.

modbus_send()

void modbus_send

(

uint8_t

length

)

Send the Modbus frame on tx_buf with CRC added

Parameters

length

: length of the frame without the CRC

Definition at line 92 of file modbus.c.

modbus_timer()

void modbus_timer

(

void

)

Modbus timer finished. This function is called by the interrupt handler when a MODBUS frame is finished. It must analyse the received packet and reply if required.

See also

interrupts.c

Definition at line 33 of file modbus.c.

Variable Documentation

holding_registers

uint16_t holding_registers[2]

extern

Definition at line 14 of file modbus.c.

input_registers

uint16_t input_registers[2]

extern

Definition at line 13 of file modbus.c.

modbusAddress

uint8_t modbusAddress

extern

Definition at line 12 of file modbus.c.