Raspberry pi wiringPi c无法发送串行数据

我有一个用于RaspberryPi的工作python文件，用于发送串行通信

import serial           # pyserial
from time import sleep

ser = serial.Serial('COM3', baudrate=9600, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_TWO)

on_packet = bytearray()

on_packet.append(0x00)
on_packet.append(0xFF)
on_packet.append(0x53)
on_packet.append(0xC3)

while 1:
    ser.write(on_packet)
    sleep(.042)
ser.close()           

我已安装WiringPi库fromhttps://github.com/WiringPi/WiringPi/tree/master/wiringPiI我使用c中的等效值

#include <wiringPi.h>
#include <wiringSerial.h>

int fd;
char on_packet[] = {0x00, 0xFF, 0x53, 0xC3};

int main ()
{
  if ((fd = serialOpen("/dev/ttyAMA0", 9600)) < 0)
  {
    printf("Unable to open serial device\n");
    return 1;
  }

  while(1)
  {
    serialPuts(fd, on_packet);
    delay(42);
  }

  serialClose(fd);
  return 0;
}

这两者都是等价的。因为我提供的c示例没有发送串行输出