static gzp_tx_rx_trans_result_t gzp_tx_rx_transaction(const uint8_t *tx_packet, uint8_t tx_length, uint8_t *rx_dst, uint8_t *rx_length, uint8_t pipe)
{
gzp_tx_rx_trans_result_t retval;
uint8_t fetch_packet[GZPAR_CMD_FETCH_RESP_PAYLOAD_LENGTH];
gzll_rx_fifo_flush();
retval = GZP_TX_RX_FAILED_TO_SEND;
if(gzp_tx_packet(tx_packet, tx_length, pipe))
{
retval = GZP_TX_RX_NO_RESPONSE;
gzll_rx_fifo_flush();
fetch_packet[0] = GZP_CMD_FETCH_RESP;
gzp_delay_rx_periods(GZP_TX_RX_TRANS_DELAY);
gzp_tx_packet(fetch_packet, GZPAR_CMD_FETCH_RESP_PAYLOAD_LENGTH, pipe);
if(gzll_rx_fifo_read(rx_dst, rx_length, NULL))
{
retval = GZP_TX_RX_SUCCESS;
}
}
return retval;
}
static void gzp_process_address_req(uint8_t* gzp_req)
{
uint8_t temp_rx_pipes, temp_host_mode;
uint8_t pairing_resp[GZP_CMD_HOST_ADDRESS_RESP_PAYLOAD_LENGTH];
gzp_address_exchanged_f = false;
gzll_goto_idle();
temp_rx_pipes = gzll_get_param(GZLL_PARAM_RX_PIPES);
temp_host_mode = gzll_get_param(GZLL_PARAM_HOST_MODE);
// If requesting Device within close proximity
if(gzll_rx_power_high())
{
gzll_set_param(GZLL_PARAM_RX_PIPES, 0);
gzll_set_param(GZLL_PARAM_HOST_MODE, 0);
gzll_set_param(GZLL_PARAM_RX_TIMEOUT, GZP_CLOSE_PROXIMITY_BACKOFF_RX_TIMEOUT);
gzll_rx_fifo_flush();
// Start "proximity" back off period
gzll_rx_start();
while(gzll_get_state() != GZLL_IDLE)
;
// Build pairing response packet
pairing_resp[0] = GZP_CMD_HOST_ADDRESS_RESP;
gzp_host_chip_id_read(&pairing_resp[GZP_CMD_HOST_ADDRESS_RESP_ADDRESS], GZP_SYSTEM_ADDRESS_WIDTH);
gzll_ack_payload_write(&pairing_resp[0], GZP_CMD_HOST_ADDRESS_RESP_PAYLOAD_LENGTH, 0);
gzll_set_param(GZLL_PARAM_RX_TIMEOUT, GZP_STEP1_RX_TIMEOUT);
// Enable only pairing pipe when waiting for pairing request step 1
gzll_set_param(GZLL_PARAM_RX_PIPES, (1 << GZP_PAIRING_PIPE));
gzll_rx_start();
while(gzll_get_state() != GZLL_IDLE)
{
if(gzll_rx_fifo_read(&gzp_req[0], NULL, NULL))
{
// Validate step 1 of pairing request
if(gzp_req[0] == GZP_CMD_HOST_ADDRESS_FETCH)
{
gzp_address_exchanged_f = true;
}
}
}
gzll_tx_fifo_flush();
gzll_rx_fifo_flush();
gzll_set_param(GZLL_PARAM_RX_TIMEOUT, 0);
gzll_set_param(GZLL_PARAM_RX_PIPES, temp_rx_pipes);
gzll_set_param(GZLL_PARAM_HOST_MODE, temp_host_mode);
// Return to normal operation
gzll_rx_start();
}
else
{
gzll_set_param(GZLL_PARAM_RX_PIPES, temp_rx_pipes & ~(1 << GZP_PAIRING_PIPE));
gzll_set_param(GZLL_PARAM_RX_TIMEOUT, GZP_NOT_PROXIMITY_BACKOFF_RX_TIMEOUT);
// Start "not proximity" backoff period
gzll_rx_start();
}
}
static void gzp_process_address_req(uint8_t* gzp_req)
{
uint8_t temp_rx_pipes;
uint8_t pairing_resp[GZP_CMD_HOST_ADDRESS_RESP_PAYLOAD_LENGTH];
uint32_t rx_payload_length = NRF_GZLL_CONST_MAX_PAYLOAD_LENGTH;
gzp_address_exchanged_f = false;
gzll_goto_idle();
ASSERT(nrf_gzll_get_error_code() == NRF_GZLL_ERROR_CODE_NO_ERROR);
temp_rx_pipes = nrf_gzll_get_rx_pipes_enabled();
ASSERT(nrf_gzll_get_error_code() == NRF_GZLL_ERROR_CODE_NO_ERROR);
// If requesting Device within close proximity
if(prev_gzp_rx_info.rssi >= GZP_HOST_RX_POWER_THRESHOLD)
{
(void)nrf_gzll_set_rx_pipes_enabled(0);
ASSERT(nrf_gzll_get_error_code() == NRF_GZLL_ERROR_CODE_NO_ERROR);
gzll_set_rx_timeout(GZP_CLOSE_PROXIMITY_BACKOFF_RX_TIMEOUT);
ASSERT(nrf_gzll_get_error_code() == NRF_GZLL_ERROR_CODE_NO_ERROR);
gzll_rx_fifo_flush();
ASSERT(nrf_gzll_get_error_code() == NRF_GZLL_ERROR_CODE_NO_ERROR);
// Start "proximity" back off period
gzll_rx_start();
ASSERT(nrf_gzll_get_error_code() == NRF_GZLL_ERROR_CODE_NO_ERROR);
while(nrf_gzll_is_enabled())
{}
// Build pairing response packet
pairing_resp[0] = (uint8_t)GZP_CMD_HOST_ADDRESS_RESP;
gzp_host_chip_id_read(&pairing_resp[GZP_CMD_HOST_ADDRESS_RESP_ADDRESS], GZP_SYSTEM_ADDRESS_WIDTH);
(void)nrf_gzll_add_packet_to_tx_fifo(0, &pairing_resp[0], GZP_CMD_HOST_ADDRESS_RESP_PAYLOAD_LENGTH);
ASSERT(nrf_gzll_get_error_code() == NRF_GZLL_ERROR_CODE_NO_ERROR);
gzll_set_rx_timeout(GZP_STEP1_RX_TIMEOUT);
// Enable only pairing pipe when waiting for pairing request step 1
(void)nrf_gzll_set_rx_pipes_enabled((1 << GZP_PAIRING_PIPE));
gzll_rx_start();
while(nrf_gzll_is_enabled())
{
if(nrf_gzll_get_rx_fifo_packet_count(GZP_PAIRING_PIPE))
{
(void)nrf_gzll_fetch_packet_from_rx_fifo(GZP_PAIRING_PIPE, &gzp_req[0], &rx_payload_length);
// Validate step 1 of pairing request
if(gzp_req[0] == (uint8_t)GZP_CMD_HOST_ADDRESS_FETCH)
{
gzp_address_exchanged_f = true;
}
}
}
gzll_tx_fifo_flush();
gzll_rx_fifo_flush();
gzll_set_rx_timeout(0);
(void)nrf_gzll_set_rx_pipes_enabled(temp_rx_pipes);
// Return to normal operation
gzll_rx_start();
}
else
{
(void)nrf_gzll_set_rx_pipes_enabled(temp_rx_pipes & ~(1 << GZP_PAIRING_PIPE));
gzll_set_rx_timeout(GZP_NOT_PROXIMITY_BACKOFF_RX_TIMEOUT);
// Start "not proximity" backoff period
gzll_rx_start();
}
}
bool gzp_address_req_send(uint8_t idx)
{
uint8_t i;
bool retval = false;
uint8_t address_req[GZP_CMD_HOST_ADDRESS_REQ_PAYLOAD_LENGTH];
uint8_t rx_payload[GZLL_MAX_PAYLOAD_LENGTH];
uint16_t temp_power, temp_tx_timeout, temp_device_mode;
if(gzll_get_state() == GZLL_IDLE)
{
// Store parameters that are temporarily changed
temp_tx_timeout = gzll_get_param(GZLL_PARAM_TX_TIMEOUT);
temp_power = gzll_get_param(GZLL_PARAM_OUTPUT_POWER);
temp_device_mode = gzll_get_param(GZLL_PARAM_DEVICE_MODE);
// Modify parameters
gzll_set_param(GZLL_PARAM_TX_TIMEOUT, GZP_REQ_TX_TIMEOUT);
gzll_set_param(GZLL_PARAM_OUTPUT_POWER, GZP_POWER);
gzll_set_param(GZLL_PARAM_DEVICE_MODE, 0);
// Flush RX FIFO
gzll_rx_fifo_flush();
// Build "request" packet
address_req[0] = GZP_CMD_HOST_ADDRESS_REQ;
// Send a number of packets in order to broadcast that devices not within
// close proximity must back off.
for(i = 0; i < GZP_MAX_BACKOFF_PACKETS; i++)
{
if(!gzp_tx_packet(address_req, GZP_CMD_HOST_ADDRESS_REQ_PAYLOAD_LENGTH, 0))
{
break;
}
}
gzp_delay_rx_periods(GZP_TX_ACK_WAIT_TIMEOUT);
// Send message for fetching pairing response from host.
address_req[0] = GZP_CMD_HOST_ADDRESS_FETCH;
if(gzp_tx_packet(&address_req[0], GZP_CMD_HOST_ADDRESS_REQ_PAYLOAD_LENGTH, 0))
{
// If pairing response received
if(gzll_rx_fifo_read(rx_payload, NULL, NULL))
{
if(rx_payload[0] == GZP_CMD_HOST_ADDRESS_RESP)
{
memcpy(gzp_system_address, &rx_payload[GZP_CMD_HOST_ADDRESS_RESP_ADDRESS], GZP_SYSTEM_ADDRESS_WIDTH);
gzp_update_radio_params(&rx_payload[GZP_CMD_HOST_ADDRESS_RESP_ADDRESS]);
pairing_list_addr_write(idx, gzp_system_address);
retval = true;
}
}
}
else
{
gzp_delay_rx_periods(GZP_NOT_PROXIMITY_BACKOFF_RX_TIMEOUT - GZP_TX_ACK_WAIT_TIMEOUT);
}
gzp_delay_rx_periods(GZP_STEP1_RX_TIMEOUT);
// Clean-up and restore parameters temporarily modified
gzll_rx_fifo_flush();
gzll_tx_fifo_flush();
gzll_set_param(GZLL_PARAM_TX_TIMEOUT, temp_tx_timeout);
gzll_set_param(GZLL_PARAM_OUTPUT_POWER, temp_power);
gzll_set_param(GZLL_PARAM_DEVICE_MODE, temp_device_mode);
}
return retval;
}