user: 请从给定的汇编指令推导出C源代码:

```asm
<FlashNVRSectorErase_Byte>:
  endbr64
  push   %rbx
  sub    $0x20,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  xor    %eax,%eax
  mov    $0x1,%eax
  cmp    $0x2,%dil
  jbe    L29
  nopl   0x0(%rax)
L55:
  mov    0x18(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L14
  add    $0x20,%rsp
  pop    %rbx
  ret
  nopw   0x0(%rax,%rax,1)
L29:
  xor    %eax,%eax
  mov    %edi,%ebx
  call   <FlashResetRelease@plt>
  mov    $0xe07014,%esi
  mov    $0xc000,%edi
  call   <RamWrite32A@plt>
  mov    $0x1,%esi
  mov    $0xd000,%edi
  call   <RamWrite32A@plt>
  mov    $0xe0701c,%esi
  mov    $0xc000,%edi
  call   <RamWrite32A@plt>
  mov    $0x7,%esi
  mov    $0xd000,%edi
  call   <RamWrite32A@plt>
  mov    $0xe07008,%esi
  mov    $0xc000,%edi
  call   <RamWrite32A@plt>
  mov    $0x10100,%esi
  mov    $0xd000,%edi
  call   <RamWrite32A@plt>
  mov    $0xe0700c,%esi
  mov    $0xc000,%edi
  call   <RamWrite32A@plt>
  mov    $0x7,%esi
  mov    $0xd000,%edi
  call   <RamWrite32A@plt>
  mov    $0xe07010,%esi
  mov    $0xc000,%edi
  call   <RamWrite32A@plt>
  mov    $0x7,%esi
  mov    $0xd000,%edi
  call   <RamWrite32A@plt>
  mov    $0xe07048,%esi
  mov    $0xc000,%edi
  call   <RamWrite32A@plt>
  mov    $0x5a,%esi
  mov    $0xd000,%edi
  call   <RamWrite32A@plt>
  mov    $0xe07008,%esi
  mov    $0xc000,%edi
  call   <RamWrite32A@plt>
  mov    $0x10000,%esi
  mov    $0xd000,%edi
  call   <RamWrite32A@plt>
  mov    $0xe0701c,%esi
  mov    $0xc000,%edi
  call   <RamWrite32A@plt>
  mov    %ebx,%ecx
  mov    $0x1,%esi
  mov    $0xd000,%edi
  shl    %cl,%esi
  call   <RamWrite32A@plt>
  mov    $0x1,%edi
  call   <WPBCtrl@plt>
  xor    %eax,%eax
  call   <ReadWPB@plt>
  mov    %eax,%r8d
  mov    $0x5,%eax
  cmp    $0x1,%r8d
  jne    L55
  mov    $0xe07010,%esi
  mov    $0xc000,%edi
  call   <RamWrite32A@plt>
  mov    $0x4,%esi
  mov    $0xd000,%edi
  call   <RamWrite32A@plt>
  mov    $0xe07018,%esi
  mov    $0xc000,%edi
  call   <RamWrite32A@plt>
  lea    0x10(%rsp),%rsi
  mov    $0xd000,%edi
  mov    %rsi,0x8(%rsp)
  call   <RamRead32A@plt>
  mov    $0x5,%edi
  call   <WitTim@plt>
  cmpq   $0x80,0x10(%rsp)
  jne    L22
  mov    0x8(%rsp),%rsi
  mov    $0xd000,%edi
  call   <RamRead32A@plt>
  mov    $0x5,%edi
  call   <WitTim@plt>
  xor    %edi,%edi
  call   <WPBCtrl@plt>
  xor    %eax,%eax
  call   <FlashReset@plt>
  mov    $0x2,%eax
  jmp    L55
L22:
  xor    %edi,%edi
  call   <WPBCtrl@plt>
  xor    %eax,%eax
  call   <FlashReset@plt>
  xor    %eax,%eax
  jmp    L55
L14:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
short FlashNVRSectorErase_Byte(unsigned char Sel) {
  unsigned char UcCnt;
  unsigned long UlReadVal;
  if (Sel >= 3)
    return (1);
  FlashResetRelease();
  RamWrite32A(0xC000, (0xE07000 + 0x14));
  RamWrite32A(0xD000, 1);
  RamWrite32A(0xC000, (0xE07000 + 0x1C));
  RamWrite32A(0xD000, 7);
  RamWrite32A(0xC000, (0xE07000 + 0x08));
  RamWrite32A(0xD000, 0x00010100);
  RamWrite32A(0xC000, (0xE07000 + 0x0C));
  RamWrite32A(0xD000, 7);
  RamWrite32A(0xC000, (0xE07000 + 0x10));
  RamWrite32A(0xD000, 7);
  RamWrite32A(0xC000, (0xE07000 + 0x48));
  RamWrite32A(0xD000, 0x5A);
  RamWrite32A(0xC000, (0xE07000 + 0x08));
  RamWrite32A(0xD000, 0x00010000);
  RamWrite32A(0xC000, (0xE07000 + 0x1C));
  RamWrite32A(0xD000, (1 << Sel));
  WPBCtrl(0x01);
  if (ReadWPB() != 1)
    return (5);
  RamWrite32A(0xC000, (0xE07000 + 0x10));
  RamWrite32A(0xD000, 4);
  RamWrite32A(0xC000, (0xE07000 + 0x18));
  UcCnt = 0;
  do {
    RamRead32A(0xD000, &UlReadVal);
    WitTim(5);
    if (++UcCnt >= 2) {
      WPBCtrl(0x00);
      FlashReset();
      return (2);
    }
  } while (UlReadVal == 0x80);
  WPBCtrl(0x00);
  FlashReset();
  return (0);
}
```