2ac8589a25
error: Path relative to repository other than nuttx must begin with the root directory Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/****************************************************************************
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* apps/examples/rfid_readuid/rfid_readuid.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <nuttx/contactless/mfrc522.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_CL_MFRC522
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# error "CONFIG_CL_MFRC522 is not defined in the configuration"
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#endif
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#ifndef CONFIG_EXAMPLES_RFID_READUID_DEVNAME
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# define CONFIG_EXAMPLES_RFID_READUID_DEVNAME "/dev/rfid0"
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* rfid_readuid_main
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****************************************************************************/
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int main(int argc, FAR char *argv[])
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{
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int fd;
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int ret;
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int count = 0;
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char buffer[10];
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fd = open(CONFIG_EXAMPLES_RFID_READUID_DEVNAME, O_RDONLY);
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if (fd < 0)
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{
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printf("Failed to open %s\n", CONFIG_EXAMPLES_RFID_READUID_DEVNAME);
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return -1;
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}
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/* Try to read a card up to 3 times */
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while (count < 3)
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{
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printf("Trying to READ: ");
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/* 11 bytes = 0x12345678\0 */
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ret = read(fd, buffer, 11);
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if (ret == 11)
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{
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printf("RFID CARD UID = %s\n", buffer);
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break;
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}
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if (ret == -EAGAIN || ret == -EPERM)
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{
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printf("Card is not present!\n");
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}
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else
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{
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printf("Unknown error!\n");
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}
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/* Wait 500ms before trying again */
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usleep(500000);
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count++;
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}
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return 0;
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}
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