user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<main>:
  endbr64
  push   %r12
  mov    $0xe100,%esi
  mov    $0x17d7840,%edi
  lea    D11(%rip),%r12
  push   %rbp
  push   %rbx
  mov    $0x1,%ebx
  call   <setup_uart@plt>
  lea    D4(%rip),%rdi
  call   <uart_puts@plt>
  mov    0x20000050,%eax
  lea    D21(%rip),%rdi
  mov    %eax,0x20000030
  call   <uart_puts@plt>
  mov    $0x3,%esi
  mov    $0x1,%edi
  call   <build_header@plt>
  mov    %eax,0x7ffc
  movl   $0xfffffff,0x7ffc
  movl   $0x0,0x7ffc
  nopl   (%rax)
L31:
  mov    0x8000,%eax
  test   %eax,%eax
  js     L31
  mov    0x7ffc,%ebp
  mov    %ebp,%edi
  call   <get_flit_type@plt>
  cmp    $0x1,%eax
  je     L47
  mov    %ebp,%edi
  cmp    $0x4,%eax
  je     L28
  call   <get_flit_payload@plt>
  mov    %eax,0x7ffc
  jmp    L31
L28:
  call   <get_flit_payload@plt>
  add    $0x1,%ebx
  mov    %eax,0x7ffc
  cmp    $0x65,%ebx
  jne    L31
  jmp    L55
  nopl   0x0(%rax)
L4:
  mov    0x7ffc,%edi
  call   <get_flit_type@plt>
L55:
  mov    0x8000,%eax
  test   %eax,%eax
  jns    L4
  xor    %eax,%eax
  call   <test_plasma_funcitons@plt>
  pop    %rbx
  xor    %eax,%eax
  pop    %rbp
  pop    %r12
  ret
L47:
  mov    %r12,%rdi
  call   <uart_puts@plt>
  xor    %edx,%edx
  mov    $0xa,%esi
  mov    %ebx,%edi
  call   <uart_print_num@plt>
  mov    $0xa,%edi
  call   <uart_putchar@plt>
  mov    $0x3,%esi
  mov    $0x1,%edi
  call   <build_header@plt>
  mov    %eax,0x7ffc
  jmp    L31
```

tool_calls: name: read_data
arguments: label: D11
type_guessed: string
name: read_data
arguments: label: D4
type_guessed: string
name: read_data
arguments: label: D21
type_guessed: string

tool: D11: Sending packet number 

tool: D4: UART TEST: If you can read this, then UART output works!


tool: D21: 

Beginning communication test



assistant: ```c
int main(int argc, char const *argv[]) {
  unsigned flit;
  unsigned flit_type;
  unsigned payload;
  unsigned packet_counter = 1;
  setup_uart(25000000, 57600);
  uart_puts("UART TEST: If you can read this, then UART output works!\n");
  unsigned gpio_in = (*(volatile unsigned int *)(0x20000050));
  (*(volatile unsigned int *)(0x20000030) = (gpio_in));
  uart_puts("\n\nBeginning communication test\n\n");
  (*(volatile unsigned int *)0x7FFCu = (build_header(1, 3)));
  (*(volatile unsigned int *)0x7FFCu = (0b1111111111111111111111111111));
  (*(volatile unsigned int *)0x7FFCu = (0));
  while (packet_counter <= 100) {
    if (((*(volatile unsigned int *)0x8000u) & 0x80000000) == 0) {
      flit = (*(volatile unsigned int *)0x7FFCu);
      flit_type = get_flit_type(flit);
      if (flit_type == 0b001) {
        uart_puts("Sending packet number ");
        uart_print_num(packet_counter, 10, 0);
        uart_putchar('\n');
        (*(volatile unsigned int *)0x7FFCu = (build_header(1, 3)));
      } else if (flit_type == 0b100) {
        payload = get_flit_payload(flit);
        (*(volatile unsigned int *)0x7FFCu = (payload));
        packet_counter++;
      } else {
        payload = get_flit_payload(flit);
        (*(volatile unsigned int *)0x7FFCu = (payload));
      }
    }
  }
  while (((*(volatile unsigned int *)0x8000u) & 0x80000000) == 0) {
    flit = (*(volatile unsigned int *)0x7FFCu);
    flit_type = get_flit_type(flit);
    packet_counter++;
  }
  test_plasma_funcitons();
  return 0;
}
```