118 lines
3.7 KiB
C
118 lines
3.7 KiB
C
#ifndef MODBUSINO_H
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#define MODBUSINO_H
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#include <stdbool.h>
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#include <stdint.h>
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typedef enum mbsn_error {
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// Library errors
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MBSN_ERROR_TRANSPORT = -3,
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MBSN_ERROR_TIMEOUT = -2,
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MBSN_ERROR_INVALID_ARGUMENT = -1,
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MBSN_ERROR_NONE = 0,
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// Modbus exceptions
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MBSN_EXCEPTION_ILLEGAL_FUNCTION = 1,
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MBSN_EXCEPTION_ILLEGAL_DATA_ADDRESS = 2,
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MBSN_EXCEPTION_ILLEGAL_DATA_VALUE = 3,
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MBSN_EXCEPTION_SERVER_DEVICE_FAILURE = 4,
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} mbsn_error;
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#define mbsn_error_is_exception(e) ((e) > 0 && (e) < 5)
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typedef uint8_t mbsn_bitfield[250];
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#define mbsn_bitfield_read(bf, b) ((bool) ((bf)[(b) / 8] & (0x1 << ((b) % 8))))
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#define mbsn_bitfield_write(bf, b, v) \
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(((bf)[(b) / 8]) = ((v) ? (((bf)[(b) / 8]) | (0x1 << ((b) % 8))) : (((bf)[(b) / 8]) & !(0x1 << ((b) % 8)))))
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typedef enum mbsn_transport {
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MBSN_TRANSPORT_RTU = 1,
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MBSN_TRANSPORT_TCP = 2,
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} mbsn_transport;
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typedef struct mbsn_transport_conf {
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mbsn_transport transport;
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int (*read_byte)(uint8_t* b);
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int (*write_byte)(uint8_t b);
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} mbsn_transport_conf;
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typedef struct {
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char* vendor_name;
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char* product_code;
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char* major_minor_revision;
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char* vendor_uri;
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char* product_name;
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char* model_name;
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char* user_application_name;
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char* extended;
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} mbsn_device_identification_data_t;
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typedef struct mbsn_callbacks {
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mbsn_error (*read_coils)(uint16_t address, uint16_t quantity, mbsn_bitfield coils_out);
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mbsn_error (*read_discrete_inputs)(uint16_t address, uint16_t quantity, mbsn_bitfield inputs_out);
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mbsn_error (*read_holding_registers)(uint16_t address, uint16_t quantity, uint16_t* registers_out);
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mbsn_error (*read_input_registers)(uint16_t address, uint16_t quantity, uint16_t* registers_out);
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mbsn_error (*write_single_coil)(uint16_t address, bool value);
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mbsn_error (*write_single_register)(uint16_t address, uint16_t value);
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mbsn_error (*write_multiple_coils)(uint16_t address, uint16_t quantity, mbsn_bitfield coils);
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mbsn_error (*write_multiple_registers)(uint16_t address, uint16_t quantity, uint16_t* registers);
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} mbsn_callbacks;
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typedef struct mbsn_t {
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// Private fields
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mbsn_callbacks callbacks;
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int64_t byte_timeout_ms;
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int64_t response_timeout_ms;
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mbsn_transport transport;
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mbsn_error (*transport_read_byte)(uint8_t*);
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mbsn_error (*transport_write_byte)(uint8_t);
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uint8_t address_rtu;
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uint8_t server_dest_address_rtu;
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} mbsn_t;
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mbsn_error mbsn_client_create(mbsn_t* mbsn, mbsn_transport_conf transport_conf);
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mbsn_error mbsn_server_create(mbsn_t* mbsn, uint8_t address, mbsn_transport_conf transport_conf,
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mbsn_callbacks callbacks);
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void mbsn_set_response_timeout(mbsn_t* mbsn, int64_t timeout_ms);
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void mbsn_set_byte_timeout(mbsn_t* mbsn, int64_t timeout_ms);
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void mbsn_client_set_server_address(mbsn_t* mbsn, uint16_t address);
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mbsn_error mbsn_server_poll(mbsn_t* mbsn);
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mbsn_error mbsn_read_coils(uint16_t address, uint16_t quantity, uint8_t* coils_out);
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mbsn_error mbsn_read_discrete_inputs(uint16_t address, uint16_t quantity, uint8_t* inputs_out);
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mbsn_error mbsn_read_holding_registers(uint16_t address, uint16_t quantity, uint16_t* registers_out);
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mbsn_error mbsn_read_input_registers(uint16_t address, uint16_t quantity, uint16_t* registers_out);
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mbsn_error mbsn_write_single_coil(uint16_t address, uint8_t value);
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mbsn_error mbsn_write_single_register(uint16_t address, uint16_t value);
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mbsn_error mbsn_write_multiple_coils(uint16_t address, uint16_t quantity, const uint8_t* values);
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mbsn_error mbsn_write_multiple_registers(uint16_t address, uint16_t quantity, const uint16_t* values);
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const char* mbsn_strerror(int error);
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#endif //MODBUSINO_H
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