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#ifndef _MODBUS_H
#define _MODBUS_H
#include "stm32f1xx_hal.h"
#include "string.h"
#define read_holding_regs 0x03
#define read_input_regs 0x04
#define write_single_reg 0x06
#define lowByte(w) ((uint8_t) ((w) & 0xff))
#define highByte(w) ((uint8_t) ((w) >> 8))
#define word(h, l) ((h << 8) | l)
#define MODBUS_TIMEOUT 50
#define MAX_BUFSIZE 64
typedef struct {
uint8_t slave_id;
uint16_t response_buffer[MAX_BUFSIZE];
uint8_t rbuf_len;
UART_HandleTypeDef modbus_uart;
} modbus_slave_device;
typedef enum {
MB_OK = 0x0,
MB_SLAVE_ID_ERR = 0x1,
MB_FUNC_ERR = 0x2,
MB_CRC_ERR = 0x3,
MB_UART_ERR = 0x4,
MB_BUSY_ERR = 0x5,
MB_TIMEOUT_ERR = 0x6
} MB_StatusTypeDef;
uint16_t crc16_update(uint16_t crc, uint8_t a);
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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