Avnet / easy-connect-wnc

Added support for the WNC M14A2A Cellular LTE Data Module.

Dependencies:   WNC14A2AInterface

Easy Connect

Easily add all supported connectivity methods to your mbed OS project

This project is derived from https://developer.mbed.org/teams/sandbox/code/simple-mbed-client-example/file/dd6231df71bb/easy-connect.lib. It give user the ability to switch between connectivity methods and includes support for the WNC14A2A Data Module. The `NetworkInterface` API makes this easy, but you still need a mechanism for the user to select the connection method, The selection is made by modifying the `mbed_app.json` file and using `easy_connect()` from your application.

Specifying connectivity method

To add support for the WNC14A2A, add the following to your ``mbed_app.json`` file:

mbed_app.json

{
    "config": {
        "network-interface":{
            "help": "options are ETHERNET,WIFI_ESP8266,WIFI_ODIN,MESH_LOWPAN_ND,MESH_THREAD,WNC14A2A",
            "value": "WNC14A2A"
        }
    },
}

After you choose `WNC14A2A` you'll also need to indicate if you want debug output or not by Enabling (true) or Disabling (false) WNC_DEBUG.

If WNC_DEBUG is enabled, there are 3 different levels of debug output (selected via bit settings). These debug levels are set using the following values:

ValueDescription
1Basic WNC driver debug output
2Comprehensive WNC driver debug output
4Network Layer debug output

You can have any combination of these three bit values for a total value of 0 – 7.

WNC Debug Settings

    "config": {
        "WNC_DEBUG": {
            "value": false
        },
        "WNC_DEBUG_SETTING": {
            "value": 4
        },
    }

Using Easy Connect from your application

Easy Connect has just one function which will either return a `NetworkInterface`-pointer or `NULL`:

Sample Code

#include "easy-connect.h"

int main(int, char**) {
    NetworkInterface* network = easy_connect(true); /* has 1 argument, enable_logging (pass in true to log to serial port) */
    if (!network) {
        printf("Connecting to the network failed... See serial output.\r\n");
        return 1;
    }
 
    // Rest of your program
}

Tested on

  • K64F with Ethernet.
  • AT&T Cellular IoT Starter Kit with WNC M14A2A Cellular Data Module

The WNCInterface class currently supports the following version(s):

  • MPSS: M14A2A_v11.50.164451 APSS: M14A2A_v11.53.164451

License

This library is released under the Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License and may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

stm-spirit1-rf-driver/source/SimpleSpirit1.cpp

Committer:
group-Avnet
Date:
2017-04-19
Revision:
0:478cfd88041f

File content as of revision 0:478cfd88041f:

/*** Mbed Includes ***/
#include "SimpleSpirit1.h"
#include "radio_spi.h"

#define SPIRIT_GPIO_IRQ			(SPIRIT_GPIO_3)

static uint16_t last_state;
#define SPIRIT1_STATUS()		((last_state = (uint16_t)refresh_state()) & SPIRIT1_STATE_STATEBITS)

#define XO_ON                   (0x1)

#define BUSYWAIT_UNTIL(cond, millisecs)                                        					\
		do {                                                                 					 		\
			uint32_t start = us_ticker_read();                         							\
			while (!(cond) && ((us_ticker_read() - start) < ((uint32_t)millisecs)*1000U));	\
		} while(0)

#define st_lib_spirit_irqs		SpiritIrqs

#define STATE_TIMEOUT           (100)

// betzw: switching force & back from standby is on some devices quite unstable
#define USE_STANDBY_STATE

/*** Class Implementation ***/
/** Static Class Variables **/
SimpleSpirit1 *SimpleSpirit1::_singleton = NULL;

/** Constructor **/
SimpleSpirit1::SimpleSpirit1(PinName mosi, PinName miso, PinName sclk,
		PinName irq, PinName cs, PinName sdn,
		PinName led) :
    		_spi(mosi, miso, sclk),
			_irq(irq),
			_chip_select(cs),
			_shut_down(sdn),
			_led(led),
			_current_irq_callback(),
			_rx_receiving_timeout()
{
}

/** Init Function **/
void SimpleSpirit1::init() {
	/* reset irq disable counter and irq callback & disable irq */
	_nr_of_irq_disables = 0;
	disable_spirit_irq();

	/* unselect chip */
	chip_unselect();

	/* configure spi */
	_spi.format(8, 0); /* 8-bit, mode = 0, [order = SPI_MSB] only available in mbed3 */
	_spi.frequency(1000000); // 1MHz // betzw: heuristic value // betzw - NOTE: high frequencies lead to instability of Spirit1

	/* install irq handler */
	_irq.mode(PullUp);
	_irq.fall(Callback<void()>(this, &SimpleSpirit1::IrqHandler));

	/* init cube vars */
	spirit_on = OFF;
	last_rssi = 0 ; //MGR
	last_sqi = 0 ;  //MGR

	/* set frequencies */
	radio_set_xtal_freq(XTAL_FREQUENCY);
	mgmt_set_freq_base((uint32_t)BASE_FREQUENCY);

	/* restart board */
	enter_shutdown();
	exit_shutdown();

	/* soft core reset */
	cmd_strobe(SPIRIT1_STROBE_SRES);

	/* Configures the SPIRIT1 radio part */
	SRadioInit x_radio_init = {
			XTAL_OFFSET_PPM,
			(uint32_t)BASE_FREQUENCY,
			(uint32_t)CHANNEL_SPACE,
			CHANNEL_NUMBER,
			MODULATION_SELECT,
			DATARATE,
			(uint32_t)FREQ_DEVIATION,
			(uint32_t)BANDWIDTH
	};
	radio_init(&x_radio_init);
	radio_set_pa_level_dbm(0,POWER_DBM);
	radio_set_pa_level_max_index(0);

	/* Configures the SPIRIT1 packet handler part*/
	PktBasicInit x_basic_init = {
			PREAMBLE_LENGTH,
			SYNC_LENGTH,
			SYNC_WORD,
			LENGTH_TYPE,
			LENGTH_WIDTH,
			CRC_MODE,
			CONTROL_LENGTH,
			EN_ADDRESS,
			EN_FEC,
			EN_WHITENING
	};
	pkt_basic_init(&x_basic_init);

	/* Enable the following interrupt sources, routed to GPIO */
	irq_de_init(NULL);
	irq_clear_status();
	irq_set_status(TX_DATA_SENT, S_ENABLE);
	irq_set_status(RX_DATA_READY,S_ENABLE);
	irq_set_status(RX_DATA_DISC, S_ENABLE);
	irq_set_status(VALID_SYNC, S_ENABLE);
	irq_set_status(TX_FIFO_ERROR, S_ENABLE);
	irq_set_status(RX_FIFO_ERROR, S_ENABLE);
#ifndef RX_FIFO_THR_WA
	irq_set_status(TX_FIFO_ALMOST_EMPTY, S_ENABLE);
	irq_set_status(RX_FIFO_ALMOST_FULL, S_ENABLE);
#endif // !RX_FIFO_THR_WA

	/* Configure Spirit1 */
	radio_persistent_rx(S_ENABLE);
	qi_set_sqi_threshold(SQI_TH_0);
	qi_sqi_check(S_ENABLE);
	qi_set_rssi_threshold_dbm(CCA_THRESHOLD);
	timer_set_rx_timeout_stop_condition(SQI_ABOVE_THRESHOLD);
	timer_set_infinite_rx_timeout();
	radio_afc_freeze_on_sync(S_ENABLE);
	calibration_rco(S_ENABLE);

	spirit_on = OFF;
	CLEAR_TXBUF();
	CLEAR_RXBUF();
	_spirit_tx_started = false;
	_is_receiving = false;

	/* Configure the radio to route the IRQ signal to its GPIO 3 */
	SGpioInit x_gpio_init = {
			SPIRIT_GPIO_IRQ,
			SPIRIT_GPIO_MODE_DIGITAL_OUTPUT_LP,
			SPIRIT_GPIO_DIG_OUT_IRQ
	};
	spirit_gpio_init(&x_gpio_init);

	/* Setup CSMA/CA */
	CsmaInit x_csma_init = {
			S_ENABLE,         // enable persistent mode
			TBIT_TIME_64,     // Tcca time
			TCCA_TIME_3,      // Lcca length
			3,                // max nr of backoffs (<8)
			1,                // BU counter seed
			8                 // BU prescaler
	};
	csma_ca_init(&x_csma_init);

#ifdef USE_STANDBY_STATE
	/* Puts the SPIRIT1 in STANDBY mode (125us -> rx/tx) */
	cmd_strobe(SPIRIT1_STROBE_STANDBY);
#endif // USE_STANDBY_STATE
}

static volatile int tx_fifo_remaining = 0;     // to be used in irq handler
static volatile int tx_buffer_pos = 0;         // to be used in irq handler
const volatile uint8_t *tx_fifo_buffer = NULL; // to be used in irq handler
int SimpleSpirit1::send(const void *payload, unsigned int payload_len) {
	/* Checks if the payload length is supported */
	if(payload_len > MAX_PACKET_LEN) {
		return RADIO_TX_ERR;
	}

	disable_spirit_irq();

	BUSYWAIT_UNTIL(SPIRIT1_STATUS() == SPIRIT1_STATE_RX, STATE_TIMEOUT);
#ifndef NDEBUG
	if((last_state & SPIRIT1_STATE_STATEBITS) != SPIRIT1_STATE_RX) {
		debug("\n\rAssert failed in: %s (%d): state=%x\n\r", __func__, __LINE__, last_state>>1);
	}
#endif

	/* Reset State to Ready */
	set_ready_state();

	cmd_strobe(SPIRIT1_STROBE_FTX); // flush TX FIFO buffer

#ifndef NDEBUG
	debug_if(!(linear_fifo_read_num_elements_tx_fifo() == 0), "\n\rAssert failed in: %s (%d)\n\r", __func__, __LINE__);
#endif

	pkt_basic_set_payload_length(payload_len); // set desired payload len

	csma_ca_state(S_ENABLE); // enable CSMA/CA

	/* Init buffer & number of bytes to be send */
	tx_fifo_remaining = payload_len;
	tx_fifo_buffer = (const uint8_t*)payload;

	int8_t fifo_available = SPIRIT_MAX_FIFO_LEN; // fill-up whole fifo
	int8_t to_send = (tx_fifo_remaining > fifo_available) ? fifo_available : tx_fifo_remaining;

	tx_fifo_remaining -= to_send;

	/* Fill FIFO Buffer */
	if(to_send > 0) {
		spi_write_linear_fifo(to_send, (uint8_t*)&tx_fifo_buffer[0]);
	}

	tx_buffer_pos = to_send;
	_spirit_tx_started = true;

	enable_spirit_irq();

	/* Start transmitting */
	cmd_strobe(SPIRIT1_STROBE_TX);

	while(tx_fifo_remaining != 0); // wait until not everything is yet send (evtl. by irq handler)

	BUSYWAIT_UNTIL(!_spirit_tx_started, STATE_TIMEOUT);
#ifdef HEAVY_DEBUG
	debug("\n\r%s (%d): state=%x, _spirit_tx_started=%d\n\r", __func__, __LINE__, SPIRIT1_STATUS()>>1, _spirit_tx_started);
#endif

	_spirit_tx_started = false; // in case of state timeout

	csma_ca_state(S_DISABLE); // disable CSMA/CA

	cmd_strobe(SPIRIT1_STROBE_RX); // Return to RX state

	return RADIO_TX_OK;
}

/** Set Ready State **/
void SimpleSpirit1::set_ready_state(void) {
	uint16_t state;

	disable_spirit_irq();

	_spirit_tx_started = false;
	_is_receiving = false;
	stop_rx_timeout();

	cmd_strobe(SPIRIT1_STROBE_FRX);
	CLEAR_RXBUF();
	CLEAR_TXBUF();

	state = SPIRIT1_STATUS();
	if(state == SPIRIT1_STATE_STANDBY) {
		cmd_strobe(SPIRIT1_STROBE_READY);
	} else if(state == SPIRIT1_STATE_RX) {
		cmd_strobe(SPIRIT1_STROBE_SABORT);
	} else if(state != SPIRIT1_STATE_READY) {
#ifndef NDEBUG
		debug("\n\rAssert failed in: %s (%d): state=%x\n\r", __func__, __LINE__, state>>1);
#endif
	}

	BUSYWAIT_UNTIL((SPIRIT1_STATUS() == SPIRIT1_STATE_READY) && ((last_state & XO_ON) == XO_ON), STATE_TIMEOUT);
	if(last_state != (SPIRIT1_STATE_READY | XO_ON)) {
		error("\n\rSpirit1: failed to become ready (%x) => pls. reset!\n\r", last_state);
		enable_spirit_irq();
		return;
	}

	irq_clear_status();

	enable_spirit_irq();
}

int SimpleSpirit1::off(void) {
	if(spirit_on == ON) {
		/* Disables the mcu to get IRQ from the SPIRIT1 */
		disable_spirit_irq();

		/* first stop rx/tx */
		set_ready_state();

#ifdef USE_STANDBY_STATE
		/* Puts the SPIRIT1 in STANDBY */
		cmd_strobe(SPIRIT1_STROBE_STANDBY);
		BUSYWAIT_UNTIL(SPIRIT1_STATUS() == SPIRIT1_STATE_STANDBY, STATE_TIMEOUT);
		if((last_state & SPIRIT1_STATE_STATEBITS) != SPIRIT1_STATE_STANDBY) {
			error("\n\rSpirit1: failed to enter standby (%x)\n\r", last_state>>1);
			return 1;
		}
#endif // USE_STANDBY_STATE

		spirit_on = OFF;
		_nr_of_irq_disables = 1;
	}
	return 0;
}

int SimpleSpirit1::on(void) {
	if(spirit_on == OFF) {
		set_ready_state();

		/* now we go to Rx */
		cmd_strobe(SPIRIT1_STROBE_RX);

		BUSYWAIT_UNTIL(SPIRIT1_STATUS() == SPIRIT1_STATE_RX, STATE_TIMEOUT);
		if((last_state & SPIRIT1_STATE_STATEBITS) != SPIRIT1_STATE_RX) {
			error("\n\rSpirit1: failed to enter rx (%x) => retry\n\r", last_state>>1);
		}

		/* Enables the mcu to get IRQ from the SPIRIT1 */
		spirit_on = ON;
#ifndef NDEBUG
		debug_if(!(_nr_of_irq_disables == 1), "\n\rAssert failed in: %s (%d)\n\r", __func__, __LINE__);
#endif
		enable_spirit_irq();
	}

#ifndef NDEBUG
	if(SPIRIT1_STATUS() != SPIRIT1_STATE_RX) {
		debug("\n\rAssert failed in: %s (%d): state=%x\n\r", __func__, __LINE__, last_state>>1);
	}
#endif

	return 0;
}

uint8_t SimpleSpirit1::refresh_state(void) {
	uint8_t mcstate;

	SpiritSpiReadRegisters(MC_STATE0_BASE, 1, &mcstate);

	return mcstate;
}

int SimpleSpirit1::read(void *buf, unsigned int bufsize)
{
	disable_spirit_irq();

	/* Checks if the RX buffer is empty */
	if(IS_RXBUF_EMPTY()) {
#ifndef NDEBUG
		debug("\n\rBuffer is empty\n\r");
#endif
		set_ready_state();

		cmd_strobe(SPIRIT1_STROBE_RX);
		BUSYWAIT_UNTIL(SPIRIT1_STATUS() == SPIRIT1_STATE_RX, STATE_TIMEOUT);
		enable_spirit_irq();
		return 0;
	}

	if(bufsize < spirit_rx_len) {
		enable_spirit_irq();

		/* If buf has the correct size */
#ifndef NDEBUG
		debug("\n\rTOO SMALL BUF\n\r");
#endif
		return 0;
	} else {
		/* Copies the packet received */
		memcpy(buf, spirit_rx_buf, spirit_rx_len);

		bufsize = spirit_rx_len;
		CLEAR_RXBUF();

		enable_spirit_irq();

		return bufsize;
	}

}

int SimpleSpirit1::channel_clear(void)
{
	float rssi_value;
	/* Local variable used to memorize the SPIRIT1 state */
	uint8_t spirit_state = ON;

	if(spirit_on == OFF) {
		/* Wakes up the SPIRIT1 */
		on();
		spirit_state = OFF;
	}

#ifndef NDEBUG
	if(SPIRIT1_STATUS() != SPIRIT1_STATE_RX) {
		debug("\n\rAssert failed in: %s (%d): state=%x\n\r", __func__, __LINE__, last_state>>1);
	}
#endif

	disable_spirit_irq();

	/* Reset State to Ready */
	set_ready_state();

	/* Stores the RSSI value */
	rssi_value = qi_get_rssi_dbm();

	enable_spirit_irq();

	/* Puts the SPIRIT1 in its previous state */
	if(spirit_state==OFF) {
		off();
#ifndef NDEBUG
#ifdef USE_STANDBY_STATE
		if(SPIRIT1_STATUS() != SPIRIT1_STATE_STANDBY) {
#else
		if(SPIRIT1_STATUS() != SPIRIT1_STATE_READY) {
#endif
			debug("\n\rAssert failed in: %s (%d): state=%x\n\r", __func__, __LINE__, last_state>>1);
		}
#endif
	} else {
		disable_spirit_irq();

        set_ready_state();

		cmd_strobe(SPIRIT1_STROBE_RX);
		BUSYWAIT_UNTIL(SPIRIT1_STATUS() == SPIRIT1_STATE_RX, STATE_TIMEOUT);
		if((last_state & SPIRIT1_STATE_STATEBITS) != SPIRIT1_STATE_RX) {
			error("\n\rSpirit1: (#2) failed to enter rx (%x) => retry\n\r", last_state>>1);
		}

		enable_spirit_irq();

#ifndef NDEBUG
		if(SPIRIT1_STATUS() != SPIRIT1_STATE_RX) {
			debug("\n\rAssert failed in: %s (%d): state=%x\n\r", __func__, __LINE__, last_state>>1);
		}
#endif
	}

	/* Checks the RSSI value with the threshold */
	if(rssi_value<CCA_THRESHOLD) {
		return 0;
	} else {
		return 1;
	}
}

int SimpleSpirit1::get_pending_packet(void)
{
	return !IS_RXBUF_EMPTY();
}

/** Spirit Irq Callback **/
void SimpleSpirit1::IrqHandler() {
	st_lib_spirit_irqs x_irq_status;

	/* get interrupt source from radio */
	irq_get_status(&x_irq_status);

	/* The IRQ_TX_DATA_SENT notifies the packet received. Puts the SPIRIT1 in RX */
	if(x_irq_status.IRQ_TX_DATA_SENT) {
#ifdef DEBUG_IRQ
		uint32_t *tmp = (uint32_t*)&x_irq_status;
		debug_if(!_spirit_tx_started, "\n\rAssert failed in: %s (%d)\n\r", __func__, __LINE__);
		debug_if(!((*tmp) & IRQ_TX_DATA_SENT_MASK), "\n\rAssert failed in: %s (%d)\n\r", __func__, __LINE__);
		debug_if(tx_fifo_remaining != 0, "\n\rAssert failed in: %s (%d)\n\r", __func__, __LINE__);
#endif

		tx_fifo_buffer = NULL;
		_spirit_tx_started = false;

		/* call user callback */
		if(_current_irq_callback) {
			_current_irq_callback(TX_DONE);
		}

		/* Disable handling of other TX flags */
		x_irq_status.IRQ_TX_FIFO_ALMOST_EMPTY = S_RESET;
	}

#ifndef RX_FIFO_THR_WA
	/* The IRQ_TX_FIFO_ALMOST_EMPTY notifies an nearly empty TX fifo */
	if(x_irq_status.IRQ_TX_FIFO_ALMOST_EMPTY) {
#ifdef DEBUG_IRQ
		uint32_t *tmp = (uint32_t*)&x_irq_status;
		debug_if(!((*tmp) & IRQ_TX_FIFO_ALMOST_EMPTY_MASK), "\n\rAssert failed in: %s (%d)\n\r", __func__, __LINE__);
		debug_if(!_spirit_tx_started, "\n\rAssert failed in: %s (%d)\n\r", __func__, __LINE__);
		debug_if(tx_fifo_buffer == NULL, "\n\rAssert failed in: %s (%d)\n\r", __func__, __LINE__);
#endif

		int8_t fifo_available = SPIRIT_MAX_FIFO_LEN/2; // fill-up half fifo
		int8_t to_send = (tx_fifo_remaining > fifo_available) ? fifo_available : tx_fifo_remaining;

		tx_fifo_remaining -= to_send;

		/* Fill FIFO Buffer */
		if(to_send > 0) {
			spi_write_linear_fifo(to_send, (uint8_t*)&tx_fifo_buffer[tx_buffer_pos]);
		}
		tx_buffer_pos += to_send;
	}
#endif // !RX_FIFO_THR_WA

	/* Transmission error */
	if(x_irq_status.IRQ_TX_FIFO_ERROR) {
#ifdef DEBUG_IRQ
		uint32_t *tmp = (uint32_t*)&x_irq_status;
		debug("\n\r%s (%d): irq=%x\n\r", __func__, __LINE__, *tmp);
		debug_if(!((*tmp) & IRQ_TX_FIFO_ERROR_MASK), "\n\rAssert failed in: %s (%d)\n\r", __func__, __LINE__);
#endif
		if(_spirit_tx_started) {
			_spirit_tx_started = false;
			/* call user callback */
			if(_current_irq_callback) {
				_current_irq_callback(TX_ERR);
			}
		}

		/* reset data still to be sent */
		tx_fifo_remaining = 0;
	}

	/* The IRQ_RX_DATA_READY notifies a new packet arrived */
	if(x_irq_status.IRQ_RX_DATA_READY) {
#ifdef DEBUG_IRQ
		uint32_t *tmp = (uint32_t*)&x_irq_status;
		debug_if(!((*tmp) & IRQ_RX_DATA_READY_MASK), "\n\rAssert failed in: %s (%d)\n\r", __func__, __LINE__);
#endif

		if(!_is_receiving) { // spurious irq?!? (betzw: see comments on macro 'RX_FIFO_THR_WA'!)
#ifdef HEAVY_DEBUG
			debug("\n\r%s (%d): irq=%x\n\r", __func__, __LINE__, *tmp);
#endif
		} else {
			_is_receiving = false; // Finished receiving
			stop_rx_timeout();

			spirit_rx_len = pkt_basic_get_received_pkt_length();

#ifdef DEBUG_IRQ
			debug_if(!(spirit_rx_len <= MAX_PACKET_LEN), "\n\r%s (%d): irq=%x\n\r", __func__, __LINE__, *tmp);
#endif

			if(spirit_rx_len <= MAX_PACKET_LEN) {
				uint8_t to_receive = spirit_rx_len - _spirit_rx_pos;
				if(to_receive > 0) {
					spi_read_linear_fifo(to_receive, &spirit_rx_buf[_spirit_rx_pos]);
					_spirit_rx_pos += to_receive;
				}
			}

			cmd_strobe(SPIRIT1_STROBE_FRX);

			last_rssi = qi_get_rssi(); //MGR
			last_sqi  = qi_get_sqi();  //MGR

			/* call user callback */
			if((_spirit_rx_pos == spirit_rx_len) && _current_irq_callback) {
				_current_irq_callback(RX_DONE);
			}

			/* Disable handling of other RX flags */
			x_irq_status.IRQ_RX_FIFO_ALMOST_FULL = S_RESET;
		}
	}

#ifndef RX_FIFO_THR_WA
	/* RX FIFO almost full */
	if(x_irq_status.IRQ_RX_FIFO_ALMOST_FULL) {
#ifdef DEBUG_IRQ
		uint32_t *tmp = (uint32_t*)&x_irq_status;
		debug_if(!((*tmp) & IRQ_RX_FIFO_ALMOST_FULL_MASK), "\n\rAssert failed in: %s (%d)\n\r", __func__, __LINE__);
#endif
		if(!_is_receiving) { // spurious irq?!?
#ifdef DEBUG_IRQ
			debug("\n\r%s (%d): irq=%x\n\r", __func__, __LINE__, *tmp);
#endif
		} else {
			uint8_t fifo_available = linear_fifo_read_num_elements_rx_fifo();
			if((fifo_available + _spirit_rx_pos) <= MAX_PACKET_LEN) {
				spi_read_linear_fifo(fifo_available, &spirit_rx_buf[_spirit_rx_pos]);
				_spirit_rx_pos += fifo_available;
			} else {
#ifdef DEBUG_IRQ
				debug("\n\r%s (%d): irq=%x\n\r", __func__, __LINE__, *tmp);
#endif
			}
		}
	}
#endif // !RX_FIFO_THR_WA

	/* Reception errors */
	if((x_irq_status.IRQ_RX_FIFO_ERROR) || (x_irq_status.IRQ_RX_DATA_DISC)) {
#ifdef DEBUG_IRQ
		uint32_t *tmp = (uint32_t*)&x_irq_status;
		debug("\n\r%s (%d): irq=%x\n\r", __func__, __LINE__, *tmp);
		debug_if(!((*tmp) & (IRQ_RX_FIFO_ERROR_MASK | IRQ_RX_DATA_DISC_MASK)), "\n\rAssert failed in: %s (%d)\n\r", __func__, __LINE__);
#endif
		rx_timeout_handler();
		if(_spirit_tx_started) {
			_spirit_tx_started = false;
			/* call user callback */
			if(_current_irq_callback) {
				_current_irq_callback(TX_ERR);
			}
		}
	}

	/* The IRQ_VALID_SYNC is used to notify a new packet is coming */
	if(x_irq_status.IRQ_VALID_SYNC) {
#ifdef DEBUG_IRQ
		uint32_t *tmp = (uint32_t*)&x_irq_status;
		debug_if(!((*tmp) & IRQ_VALID_SYNC_MASK), "\n\rAssert failed in: %s (%d)\n\r", __func__, __LINE__);
#endif
		/* betzw - NOTE: there is a race condition between Spirit1 receiving packets and
		 *               the MCU trying to send a packet, which gets resolved in favor of
		 *               sending.
		 */
		if(_spirit_tx_started) {
#ifdef DEBUG_IRQ
			debug("\n\r%s (%d): irq=%x\n\r", __func__, __LINE__, *tmp);
#endif
		} else {
			_is_receiving = true;
			start_rx_timeout();
		}
	}
}