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#ifndef _MODBUS_H
#define _MODBUS_H
#include <string.h>
#include <inttypes.h>
/* Modbus function codes */
#define read_holding_regs 0x03
#define read_input_regs 0x04
#define write_single_reg 0x06
/* Helpful macros */
#define lowByte(w) ((uint8_t) ((w) & 0xff))
#define highByte(w) ((uint8_t) ((w) >> 8))
#define word(h, l) ((h << 8) | l)
/* Maximum response buffer size for Modbus nodes */
#define MAX_BUFSIZE 64
typedef struct {
uint8_t slave_id;
uint16_t response_buffer[MAX_BUFSIZE];
uint8_t rbuf_len;
uint8_t modbus_timeout;
void* modbus_uart;
} modbus_slave_device;
typedef enum {
MB_OK = 0x0,
MB_UART_ERR_1 = 0x1,
MB_UART_ERR_2 = 0x2,
MB_UART_ERR_3 = 0x3,
MB_SLAVE_ID_ERR = 0x4,
MB_FUNC_ERR = 0x5,
MB_CRC_ERR = 0x6
} MB_StatusTypeDef;
extern MB_StatusTypeDef (*MB_UART_Tx)(void*, uint16_t*, uint8_t*, uint8_t*);
extern MB_StatusTypeDef (*MB_UART_Rx)(void*, uint16_t*, uint8_t*, uint8_t*);
MB_StatusTypeDef modbus_transaction(uint8_t func, modbus_slave_device *device,
uint16_t rw_addr, int read_num,
uint16_t write_value);
MB_StatusTypeDef ReadHoldingRegisters(modbus_slave_device *device,
uint16_t reg_addr,
int read_num);
MB_StatusTypeDef ReadInputRegisters(modbus_slave_device *device,
uint16_t reg_addr,
int read_num);
MB_StatusTypeDef WriteSingleRegister(modbus_slave_device *device,
uint16_t reg_addr,
uint16_t write_val);
void ClearResponseBuffer(modbus_slave_device *device);
#endif
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