Beispiel #1
0
void nrf24l01p_start(nrf24l01p_t *dev)
{
    gpio_set(dev->ce);
    hwtimer_wait(DELAY_CE_START_US);
}
Beispiel #2
0
int nrf24l01p_init(nrf24l01p_t *dev, spi_t spi, gpio_t ce, gpio_t cs, gpio_t irq)
{
    int status;
    char INITIAL_TX_ADDRESS[] =  {0xe7, 0xe7, 0xe7, 0xe7, 0xe7,};
    char INITIAL_RX_ADDRESS[] =  {0xe7, 0xe7, 0xe7, 0xe7, 0xe7,};

    dev->spi = spi;
    dev->ce = ce;
    dev->cs = cs;
    dev->irq = irq;
    dev->listener = KERNEL_PID_UNDEF;

    /* Init CE pin */
    gpio_init_out(dev->ce, GPIO_NOPULL);

    /* Init CS pin */
    gpio_init_out(dev->cs, GPIO_NOPULL);
    gpio_set(dev->cs);

    /* Init IRQ pin */
    gpio_init_int(dev->irq, GPIO_PULLUP, GPIO_FALLING, nrf24l01p_rx_cb, dev);


    /* Init SPI */
    spi_poweron(dev->spi);
    spi_acquire(dev->spi);
    status = spi_init_master(dev->spi, SPI_CONF_FIRST_RISING, SPI_SPEED_400KHZ);
    spi_release(dev->spi);

    if (status < 0) {
        return status;
    }

    hwtimer_spin(DELAY_AFTER_FUNC_TICKS);

    /* Flush TX FIFIO */
    status = nrf24l01p_flush_tx_fifo(dev);

    if (status < 0) {
        return status;
    }

    /* Flush RX FIFIO */
    status = nrf24l01p_flush_tx_fifo(dev);

    if (status < 0) {
        return status;
    }

    /* Setup adress width */
    status = nrf24l01p_set_address_width(dev, NRF24L01P_AW_5BYTE);

    if (status < 0) {
        return status;
    }

    /* Setup payload width */
    status = nrf24l01p_set_payload_width(dev, NRF24L01P_PIPE0, NRF24L01P_MAX_DATA_LENGTH);

    if (status < 0) {
        return status;
    }

    /* Set RF channel */
    status = nrf24l01p_set_channel(dev, INITIAL_RF_CHANNEL);

    if (status < 0) {
        return status;
    }

    /* Set RF power */
    status = nrf24l01p_set_power(dev, 0);

    if (status < 0) {
        return status;
    }

    /* Set RF datarate */
    status = nrf24l01p_set_datarate(dev, NRF24L01P_DR_250KBS);

    if (status < 0) {
        return status;
    }

    /* Set TX Address */
    status = nrf24l01p_set_tx_address(dev, INITIAL_TX_ADDRESS, INITIAL_ADDRESS_WIDTH);

    if (status < 0) {
        return status;
    }

    /* Set RX Adress */
    status = nrf24l01p_set_rx_address(dev, NRF24L01P_PIPE0, INITIAL_RX_ADDRESS, INITIAL_ADDRESS_WIDTH);

    if (status < 0) {
        return status;
    }

    /* Reset auto ack for all pipes */
    status = nrf24l01p_disable_all_auto_ack(dev);

    if (status < 0) {
        return status;
    }

    /* Setup Auto ACK and retransmission */
    status = nrf24l01p_setup_auto_ack(dev, NRF24L01P_PIPE0, NRF24L01P_RETR_750US, 15);

    if (status < 0) {
        return status;
    }

    /* Setup CRC */
    status = nrf24l01p_enable_crc(dev, NRF24L01P_CRC_2BYTE);

    if (status < 0) {
        return status;
    }

    /* Reset all interrupt flags */
    status = nrf24l01p_reset_all_interrupts(dev);

    if (status < 0) {
        return status;
    }

    return nrf24l01p_on(dev);
}
Beispiel #3
0
void board_init(void)
{
    int status;

    /* initialize the boards LEDs */
    gpio_init(LED0_PIN, GPIO_OUT);
    gpio_init(LED1_PIN, GPIO_OUT);
    gpio_init(LED2_PIN, GPIO_OUT);

    /* Initialize power control pins */
    power_pins_init();

    /* Turn on Vperiph for peripherals */
    /*
     * By turning on Vperiph first, and before waiting for the clocks to
     * stabilize, we will have used enough time to have let the FRAM start up
     * properly when we want to access it later without having to add any extra
     * delays.
     */
    gpio_set(MULLE_POWER_VPERIPH);

    /* Turn on AVDD for reading voltages */
    gpio_set(MULLE_POWER_AVDD);

    /* Initialize RTC oscillator as early as possible since we are using it as a
     * base clock for the FLL.
     * It takes a while to stabilize the oscillator, therefore we do this as
     * soon as possible during boot in order to let it stabilize while other
     * stuff is initializing. */
    /* If the clock is not stable then the UART will have the wrong baud rate
     * for debug prints as well */
    rtt_init();

    /* Set up clocks */
    set_safe_clock_dividers();

    set_fll_source();

    kinetis_mcg_set_mode(KINETIS_MCG_FEE);

    /* At this point we need to wait for 1 ms until the clock is stable.
     * Since the clock is not yet stable we can only guess how long we must
     * wait. I have tried to make this as short as possible but still being able
     * to read the initialization messages written on the UART.
     * (If the clock is not stable all UART output is garbled until it has
     * stabilized) */
    for (int i = 0; i < 100000; ++i) {
        __asm__ volatile("nop\n");
    }

    /* initialize the CPU */
    cpu_init();

    /* NVRAM requires xtimer for timing */
    xtimer_init();

    /* Initialize NVRAM */
    status = mulle_nvram_init();
    if (status == 0) {
        /* Increment boot counter */
        increase_boot_count();
    }

    /* Initialize NOR flash */
    mulle_nor_init();
}