#include "nanomodbus.h"
#include "main.h"
#include "usart.h"  // for &huart2

static uint8_t rx_buf[256];
static uint8_t tx_buf[256];

// nanoMODBUS requires this structure:
mb_port_t modbus_port;

// Read function (blocking or interrupt/DMA based)
int modbus_read(uint8_t *dest, uint16_t len, uint32_t timeout_ms) {
    if (HAL_UART_Receive(&huart2, dest, len, timeout_ms) == HAL_OK) {
        return len;
    }
    return -1;
}

// Write function
int modbus_write(const uint8_t *src, uint16_t len, uint32_t timeout_ms) {
    if (HAL_UART_Transmit(&huart2, (uint8_t*)src, len, timeout_ms) == HAL_OK) {
        return len;
    }
    return -1;
}

// Register your transport functions
void modbus_transport_init(void) {
    modbus_port.read = modbus_read;
    modbus_port.write = modbus_write;
}