Transmit and Receive Basic
I had an Armtronix IA005 SX1276 loRa node sitting on my desk so used it running a modified version of the Arduino LoRa library LoRaSetSyncWord example to send messages to and receive messages from my SC20100 device.
The SC20100 transmit application configures the SX127X, sends a message, waits until transmission is completed, then repeats every 30 seconds.
class Program
{
static void Main()
{
Rfm9XDevice rfm9XDevice = new Rfm9XDevice(SC20100.SpiBus.Spi3, SC20100.GpioPin.PA13, SC20100.GpioPin.PA14);
int SendCount = 0;
// Put device into LoRa + Sleep mode
rfm9XDevice.RegisterWriteByte(0x01, 0b10000000); // RegOpMode
// Set the frequency to 915MHz
byte[] frequencyWriteBytes = { 0xE4, 0xC0, 0x00 }; // RegFrMsb, RegFrMid, RegFrLsb
rfm9XDevice.RegisterWrite(0x06, frequencyWriteBytes);
// More power PA Boost
rfm9XDevice.RegisterWriteByte(0x09, 0b10000000); // RegPaConfig
//rfm9XDevice.RegisterDump();
while (true)
{
rfm9XDevice.RegisterWriteByte(0x0E, 0x0); // RegFifoTxBaseAddress
// Set the Register Fifo address pointer
rfm9XDevice.RegisterWriteByte(0x0D, 0x0); // RegFifoAddrPtr
string messageText = $"Hello LoRa {SendCount += 1}!";
// load the message into the fifo
byte[] messageBytes = UTF8Encoding.UTF8.GetBytes(messageText);
rfm9XDevice.RegisterWrite(0x0, messageBytes); // RegFifo
// Set the length of the message in the fifo
rfm9XDevice.RegisterWriteByte(0x22, (byte)messageBytes.Length); // RegPayloadLength
Debug.WriteLine($"Sending {messageBytes.Length} bytes message {messageText}");
/// Set the mode to LoRa + Transmit
rfm9XDevice.RegisterWriteByte(0x01, 0b10000011); // RegOpMode
// Wait until send done, no timeouts in PoC
Debug.WriteLine("Send-wait");
byte IrqFlags = rfm9XDevice.RegisterReadByte(0x12); // RegIrqFlags
while ((IrqFlags & 0b00001000) == 0) // wait until TxDone cleared
{
Thread.Sleep(10);
IrqFlags = rfm9XDevice.RegisterReadByte(0x12); // RegIrqFlags
Debug.WriteLine(".");
}
rfm9XDevice.RegisterWriteByte(0x12, 0b00001000); // clear TxDone bit
Debug.WriteLine("Send-Done");
Thread.Sleep(30000);
}
}
}
When I ran the SC20100 application in Visual Studio
'GHIElectronics.TinyCLR.VisualStudio.ProjectSystem.dll' (Managed): Loaded 'C:\Users\BrynLewis\source\repos\RFM9X.TinyCLR\TransmitBasic\bin\Debug\pe\..\TransmitBasic.exe', Symbols loaded. The thread '<No Name>' (0x2) has exited with code 0 (0x0). Sending 13 bytes message Hello LoRa 1! Send-wait . . . . Send-Done Sending 13 bytes message Hello LoRa 2! Send-wait . . . . Send-Done
I could the see the messages arriving at the Armtronix device in the Arduino monitor.
14:13:34.722 -> Message: Hello LoRa 1! 14:13:34.722 -> Length: 13 14:13:34.756 -> FirstChar: 72 14:13:34.756 -> RSSI: -48 14:13:34.756 -> Snr: 9.75 14:13:34.790 -> 14:13:36.658 -> Sending HeLoRa World! 24 14:13:47.105 -> Sending HeLoRa World! 26 14:13:57.740 -> Sending HeLoRa World! 28 14:14:04.745 -> Message: Hello LoRa 2! 14:14:04.745 -> Length: 13 14:14:04.779 -> FirstChar: 72 14:14:04.779 -> RSSI: -49 14:14:04.779 -> Snr: 9.50 14:14:04.847 ->
The SC20100 receive application configures the SX127X, polls a status register to looking to see if a message has arrived, displays it as text and then goes back to waiting.
class Program
{
static void Main()
{
Rfm9XDevice rfm9XDevice = new Rfm9XDevice(SC20100.SpiBus.Spi3, SC20100.GpioPin.PA13, SC20100.GpioPin.PA14);
// Put device into LoRa + Sleep mode
rfm9XDevice.RegisterWriteByte(0x01, 0b10000000); // RegOpMode
// Set the frequency to 915MHz
byte[] frequencyWriteBytes = { 0xE4, 0xC0, 0x00 }; // RegFrMsb, RegFrMid, RegFrLsb
rfm9XDevice.RegisterWrite(0x06, frequencyWriteBytes);
rfm9XDevice.RegisterWriteByte(0x0F, 0x0); // RegFifoRxBaseAddress
rfm9XDevice.RegisterWriteByte(0x01, 0b10000101); // RegOpMode set LoRa & RxContinuous
while (true)
{
// Wait until a packet is received, no timeouts in PoC
Debug.WriteLine("Receive-Wait");
byte irqFlags = rfm9XDevice.RegisterReadByte(0x12); // RegIrqFlags
while ((irqFlags & 0b01000000) == 0) // wait until RxDone cleared
{
Thread.Sleep(100);
irqFlags = rfm9XDevice.RegisterReadByte(0x12); // RegIrqFlags
//Debug.Write(".");
}
Debug.WriteLine("");
Debug.WriteLine($"RegIrqFlags 0X{irqFlags:X2}");
Debug.WriteLine("Receive-Message");
byte currentFifoAddress = rfm9XDevice.RegisterReadByte(0x10); // RegFifiRxCurrent
rfm9XDevice.RegisterWriteByte(0x0d, currentFifoAddress); // RegFifoAddrPtr
byte numberOfBytes = rfm9XDevice.RegisterReadByte(0x13); // RegRxNbBytes
byte[] messageBytes = rfm9XDevice.RegisterRead(0x00, numberOfBytes); // RegFifo
rfm9XDevice.RegisterWriteByte(0x0d, 0);
rfm9XDevice.RegisterWriteByte(0x12, 0b11111111); // RegIrqFlags clear all the bits
string messageText = UTF8Encoding.UTF8.GetString(messageBytes);
Debug.WriteLine($"Received {messageBytes.Length} byte message {messageText}");
Debug.WriteLine("Receive-Done");
}
}
}
When I ran the SC20100 application in Visual Studio
'GHIElectronics.TinyCLR.VisualStudio.ProjectSystem.dll' (Managed): Loaded 'C:\Users\BrynLewis\source\repos\RFM9X.TinyCLR\ReceiveBasic\bin\Debug\pe\..\ReceiveBasic.exe', Symbols loaded. The thread '<No Name>' (0x2) has exited with code 0 (0x0). Receive-Wait RegIrqFlags 0X50 Receive-Message Received 16 byte message HeLoRa World! 74 Receive-Done Receive-Wait RegIrqFlags 0X50 Receive-Message Received 59 byte message �LoRaIoT1Maduino2at 64.6,ah 66,wsa 2,wsg 3,wd 37.13,r 0.00, Receive-Done Receive-Wait RegIrqFlags 0X50 Receive-Message Received 16 byte message HeLoRa World! 76 Receive-Done Receive-Wait RegIrqFlags 0X50 Receive-Message Received 16 byte message HeLoRa World! 78 Receive-Done Receive-Wait
I could the see the messages arriving at the Armtronix device in the Arduino monitor.
14:18:02.785 -> Sending HeLoRa World! 74 14:18:09.270 -> Message: ⸮LoRaIoT1Maduino2at 64.6,ah 66,wsa 2,wsg 3,wd 37.13,r 0.00, 14:18:09.339 -> Length: 59 14:18:09.339 -> FirstChar: 136 14:18:09.407 -> RSSI: -83 14:18:09.407 -> Snr: 9.75 14:18:09.407 -> 14:18:13.249 -> Sending HeLoRa World! 76 14:18:23.416 -> Sending HeLoRa World! 78 14:18:33.582 -> Sending HeLoRa World! 80 14:18:43.883 -> Sending HeLoRa World! 82 14:18:54.136 -> Sending HeLoRa World! 84
I’ll merge the transmit and receive on interrupt samples in the next post as a final step before porting the core library modules.
