Sure, here is an example code for implementing the OneWire protocol using UART on a microcontroller:

```c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>

// UART configuration
#define UART_DEVICE "/dev/ttyS0"
#define UART_BAUDRATE 115200

// OneWire protocol constants
#define RESET_PULSE_WIDTH_US 480
#define READ_BIT_TIME_US 60
#define WRITE_BIT_TIME_US 60

// Function prototypes
void uart_init(void);
void uart_write_byte(uint8_t byte);
uint8_t uart_read_byte(void);
void onewire_reset(void);
uint8_t onewire_read_bit(void);
void onewire_write_bit(uint8_t bit);

int main(void) {
  // Initialize the UART
  uart_init();

  // Reset the OneWire bus
  onewire_reset();

  // Read a bit from the OneWire bus
  uint8_t bit = onewire_read_bit();

  // Print the bit value
  printf("Bit value: %d\n", bit);

  return 0;
}

void uart_init(void) {
  // Open the UART device
  int fd = open(UART_DEVICE, O_RDWR);
  if (fd < 0) {
    perror("Error opening UART device");
    exit(1);
  }

  // Configure the UART
  struct termios uart_config;
  tcgetattr(fd, &uart_config);
  uart_config.c_cflag = BAUDRATE | CS8 | CLOCAL | CREAD;
  uart_config.c_iflag = IGNPAR;
  uart_config.c_oflag = 0;
  tcsetattr(fd, TCSANOW, &uart_config);
}

void uart_write_byte(uint8_t byte) {
  // Write the byte to the UART
  write(fd, &byte, 1);
}

uint8_t uart_read_byte(void) {
  // Read a byte from the UART
  uint8_t byte;
  read(fd, &byte, 1);
  return byte;
}

void onewire_reset(void) {
  // Send a 480us reset pulse on the OneWire bus
  uart_write_byte(0xFF);
  usleep(RESET_PULSE_WIDTH_US);
}

uint8_t onewire_read_bit(void) {
  // Send a 60us read pulse on the OneWire bus
  uart_write_byte(0xFF);
  usleep(READ_BIT_TIME_US);

  // Read the data bit from the UART
  uint8_t data_bit = uart_read_byte();
  return (data_bit & 0x01);
}

void onewire_write_bit(uint8_t bit) {
  // Send a 60us write pulse on the OneWire bus
  uart_write_byte(0xFF ^ (bit << 7));
  usleep(WRITE_BIT_TIME_US);
}
```

This code is just a simple example, and it would need to be modified to work with a specific microcontroller and UART hardware. However, it should give you a general idea of how to implement the OneWire protocol using UART.

I hope this helps!
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