void nrf24l01p_start(nrf24l01p_t *dev)
{
gpio_set(dev->ce);
hwtimer_wait(DELAY_CE_START_US);
}
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);
}
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();
}