main.c

#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include <getopt.h>
#include <stdlib.h>
#include <stdbool.h>
#include "mfrc522.h"
#define DISP_COMMANDLINE()	printf("RC522>")

int scan_loop(uint8_t *CardID);
int tag_select(uint8_t *CardID);

int main(int argc, char **argv) {
	MFRC522_Status_t ret;
	//Recognized card ID
	uint8_t CardID[5] = { 0x00, };
	static char command_buffer[1024];
	bool autodump_mode = false;

    if (argc <= 1)
    {
        puts("Please specify device!");
        exit(-1);
    }
    if ((argc > 2 && strcmp(argv[2], "autodump") == 0))
    {
        puts("Autodump mode enabled!");
        autodump_mode = true;
    }

	ret = MFRC522_Init('A', argv[1]);
	if (ret < 0) {
		perror("Failed to initialize");
		exit(-1);
	}
	printf("User Space RC522 Application\r\n");

	if (!autodump_mode) {
		while (1) {
			/*Main Loop Start*/
			DISP_COMMANDLINE();

			scanf("%s", command_buffer);
			if (strcmp(command_buffer, "scan") == 0) {
				puts("Scanning");
				while (1) {
					ret = MFRC522_Check(CardID);
					if (ret != MI_OK) {
						printf(".");
						fflush(stdout);
						continue;
					}
					ret |= tag_select(CardID);
					if (ret == MI_OK) {
						ret = scan_loop(CardID);
						if (ret < 0) {
							goto END_SCAN;
						} else if (ret == 1) {
							goto HALT;
						}
					}
				}
				END_SCAN: printf("Card error...");
				HALT: puts("Halt");
			} else if (strcmp(command_buffer, "quit") == 0
					|| strcmp(command_buffer, "exit") == 0) {
				return 0;
			} else {
				puts("Unknown command");
				puts("scan:scan card and dump");
				puts("quit:exit program");
			}
			/*Main Loop End*/
		}
	} else {
		while (true) {
			ret = MFRC522_Check(CardID);
			if (ret != MI_OK) {
				continue;
			}
			ret |= tag_select(CardID);
			if (ret == MI_OK) {
				MFRC522_Debug_DumpSector(CardID, 0, false);
			}
			fflush(stdout);
		}
	}
}

int scan_loop(uint8_t *CardID) {

	while (1) {

		char input[32];
		int block_start;
		DISP_COMMANDLINE();
		printf("%02X%02X%02X%02X>", CardID[0], CardID[1], CardID[2], CardID[3]);
		scanf("%s", input);
		puts((char*)input);
		if (strcmp(input, "halt") == 0) {
			return 1;
		} else if (strcmp(input, "dump") == 0) {
			if (MFRC522_Debug_CardDump(CardID) < 0)
				return -1;
		} else if (strcmp(input, "read") == 0) {
			scanf("%d", &block_start);
			if (MFRC522_Debug_DumpSector(CardID, block_start, true) < 0) {
				return -1;
			}
		} else if (strcmp(input, "writestr") == 0) {
			char write_buffer[256], c;
			size_t len = 0;
			scanf("%d", &block_start);
			while ((c = getchar()) != '\n' && c != EOF)
				;
			printf(">");
			if (len >= 0) {
				if (MFRC522_Debug_Write(block_start, write_buffer,
						strlen(write_buffer)) < 0) {
					return -1;
				}
			}
		} else {

			printf(
					"Usage:\r\n" "\tread <blockstart>\r\n" "\tdump\r\n" "\twritestr <blockaddr>\r\n");
			return 0;
		}
	}
	return 0;

}

int tag_select(uint8_t *CardID) {
	int ret_int;
	printf(
			"Card detected    0x%02X 0x%02X 0x%02X 0x%02X, Check Sum = 0x%02X\r\n",
			CardID[0], CardID[1], CardID[2], CardID[3], CardID[4]);
	ret_int = MFRC522_SelectTag(CardID);
	if (ret_int == 0) {
		printf("Card Select Failed\r\n");
		return -1;                 
	} else {
		printf("Card Selected, Type:%s\r\n",
				MFRC522_TypeToString(MFRC522_ParseType(ret_int)));
	}
	ret_int = 0;
	return ret_int;
}