Guten Morgen alle zusammen,
ich versuche zur Zeit einen Funk-Chip (RFM12B) über das SPI-Interface
mit meinem AVR32-Board (EVK1101) zu verbinden.
Ich initialisiere SPI folgendermaßen:
1 | static const gpio_map_t SPI_GPIO_MAP =
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2 | {
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3 | {SCK, 0 }, //GPIO15, Function A // SPI Clock.
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4 | {MISO, 0 }, //GPIO25, Function A // MISO.
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5 | {MOSI, 0 }, //GPIO14, Function A // MOSI.
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6 | {NSEL, 0 }, //GPIO16, Function A // CS0
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7 | };
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8 |
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9 |
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10 | // SPI options.
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11 | static const spi_options_t spi_options =
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12 | {
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13 | .reg = 0, //! The SPI channel to set up.
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14 | .baudrate = 500000,
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15 | .bits = 8, //! Number of bits in each character (8 to 16).
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16 | .spck_delay = 0, //! Delay before first clock pulse after selecting slave.
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17 | .trans_delay = 4, //! Delay between each transfer/character.
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18 | .stay_act = 0, //! Sets this chip to stay active after last transfer to it.
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19 | .spi_mode = 1, //! Which SPI mode to use when transmitting.
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20 | .modfdis = 0, //! Disables the mode fault detection.
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21 | };
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22 |
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23 | void init_spi()
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24 | {
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25 | // Assign I/Os to SPI.
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26 | if(gpio_enable_module(SPI_GPIO_MAP, sizeof(SPI_GPIO_MAP) / sizeof(SPI_GPIO_MAP[0])) != GPIO_SUCCESS)
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27 | show_error();
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28 |
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29 | // Initialize as master.
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30 | if(spi_initMaster(&AVR32_SPI, &spi_options) != SPI_OK)
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31 | show_error();
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32 |
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33 | // Set selection mode: variable_ps, pcs_decode, delay.
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34 | if(spi_selectionMode(&AVR32_SPI, 0, 0, 0) != SPI_OK)
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35 | show_error();
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36 |
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37 | if(spi_selectChip(&AVR32_SPI, 0) != SPI_OK)
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38 | show_error();
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39 |
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40 | if(spi_setupChipReg(&AVR32_SPI, &spi_options, 20000000) != SPI_OK)
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41 | show_error();
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42 |
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43 | // Enable SPI.
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44 | spi_enable(&AVR32_SPI);
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45 |
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46 | }
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Und jetzt würde ich gerne per spi_write() befehle an meinen Chip senden.
Allerdings ist nur das erste Senden erfolgreich, alle anschliessenden
spi_write() liefern SPI_ERROR_TIMEOUT zurück:
1 | while(1)
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2 | {
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3 | spi_status_t status = spi_write(&AVR32_SPI, a);
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4 | if(status == SPI_OK)
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5 | LED_On(0b00001000);
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6 | else if(status == SPI_ERROR_TIMEOUT)
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7 | show_error();
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8 | else
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9 | show_error2();
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10 | }
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Merkwürdigerweise funktioniert es aber wenn ich vor jedem write erneut
ein init ausführe.
Hat jemand eine Idee was ich falsch mache?
gruß Oliver
