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// Set the NT module to receive mode
printf(“ %c%c%c%c ”, 0x02, 0x12, 0x00, 0xFF);
// Flush the NT ACK response by waiting for the terminating character
while (getc() != 0xFF);
// Get RSSI for each channel & assign the receiver to the quietest frequency
for (i=0; i<3; i++)
{
// Set the NT module to the next channel in sequence
printf(“ %c%c%c%c ”, 0x02, 0x10, channel[i], 0xFF);
// Flush the NT ACK response by waiting for the terminating character
while (getc() != 0xFF);
// Read RSSI from the NT module
printf(“ %c%c%c%c ”, 0x01, 0x1F, 0x00, 0xFF);
// Get the RSSI value from the NT
nt_rply[0] = getc();
nt_rply[1] = getc();
rssi_val = getc();
nt_rply[3] = getc();
}
// Use the channel with the lowest RSSI value for receive mode
if (rssi_val < prev_rssi)
{
// Assign the quieter channel frequency
rx_ch = channel[i];
// Update the previous RSSI value
prev_rssi = rssi_val;
}
// Set the NT module to the selected channel frequency
printf(“ %c%c%c%c ”, 0x02, 0x10, rx_ch, 0xFF);
// Flush the NT ACK response by waiting for the terminating character
while (getc() != 0xFF);
}
/******************************************************************************/
//******************************************************************************
/*
--------------------------------------------------------------------------------
Overview: This function allows over-the-air (OTA) application data from pin
DATA_IN to be transmitted at each of three channel frequencies.
The receiver will be listening on one of these three channels.
The idea is to send the same message on each frequency so the
receiver has the opportunity to listen on the quietest channel.
The order for serial communication is as follows:
1. Set the NT to software control for channel and RX/TX select.
2. Set the NT to transmit mode.
3. Set the NT to the 1st channel frequency
4. Send the OTA data packet into DATA_IN pin of the NT module.
5. Set the NT to the 2nd channel frequency
6. Send the OTA data packet into DATA_IN pin of the NT module.
7. Set the NT to the 3rd channel frequency
8. Send the OTA data packet into DATA_IN pin of the NT module.
NOTE:
Input:
none
Output: none
--------------------------------------------------------------------------------
*/
//******************************************************************************
– 9 –
NT Series Command Data Interface
Reference Guide RG-00101
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