Hallo liebe leut,
ich versuche gerade einen RFID reader (mfrc522) zum laufen zu bringen.
Doch dabei habe ich Probleme (evtl. beim SPI)
1 | MFRC -> Arduino Uno -> ATmega328
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2 | SDA -> Pin10 -> PB2
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3 | SCK -> PIN13 -> PB5
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4 | MOSI -> PIN11 -> PB3
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5 | MISO -> PIN12 -> PB4
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6 | IRQ -> nicht angeschlossen
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7 | RST -> PIN9 -> PB1
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8 | GND -> GND
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9 | 3.3V -> 3.3V
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main.c
1 | int main(void)
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2 | {
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3 | sei();
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4 | uart_init(MYUBRR);
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5 | spi_initMaster();
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6 | uart_putstring("start action\n");
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7 | char mfrc522Info[100];
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8 | mfrc522_init();
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9 | uart_putstring("lese dumpVersion...\r\n");
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10 | (void)mfrc522_getDumpVersionData(mfrc522Info);
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11 | uart_putstring(mfrc522Info);
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12 | while (1)
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13 | {
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14 | _delay_ms(1000);
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15 | uart_putstring("blabla\n");
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16 | }
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17 | }
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1 | void mfrc522_init(void)
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2 | {
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3 | DDRB |= (1 << PINB2); /* Set the chipSelectPin as digital output */
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4 |
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5 | uart_putstring("0\n");
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6 | mfrc522_writeRegister(MFRC522_COMMAND_REG, MFRC522_SOFT_RESET);
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7 | uint8_t count_u8 = 0;
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8 | uint8_t tempVal_u8 = 0;
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9 | do
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10 | {
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11 | _delay_ms(50);
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12 | mfrc522_readRegister(MFRC522_COMMAND_REG, &tempVal_u8);
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13 | }while((tempVal_u8 & (1 << 4)) && (++count_u8 < 3));
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14 | uart_putstring("ios\n")
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15 | }
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16 |
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17 |
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18 | static uint8_t mfrc522_writeRegister(uint8_t reg, uint8_t value)
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19 | {
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20 | uint8_t retVal_u8 = 1;;
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21 | DDRB &= ~(1 << PINB2);
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22 | uart_putstring("1\n");
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23 | retVal_u8 = spi_transmitData(reg);
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24 | uart_putstring("2\n");
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25 | retVal_u8 = spi_transmitData(value);
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26 | uart_putstring("3\n");
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27 | DDRB |= (1 << PINB2);
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28 | return retVal_u8;
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29 | }
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30 |
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31 | uint8_t spi_transmitData(uint8_t byte)
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32 | {
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33 | /* start transmission */
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34 | SPDR = byte;
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35 |
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36 | uart_putstring("before while transmit\n");
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37 | /* wait for transission complete */
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38 | while(!(SPSR & (1 << SPIF)));
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39 |
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40 | uart_putstring("after while transmit\n");
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41 |
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42 | //return SPDR;
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43 | return 1;
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44 | }
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Mein Output wie folgt aus: (benutze HTerm für UART)
1 | start action
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2 | 0
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3 | 1
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4 | before while transmit
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5 | after while transmit
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6 | 2
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7 | before while transmit
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Dann bekomme ich keine Nachrichten mehr am PC.
